CN117803911A - Heating system for realizing deep decoupling of machine furnace and operation method - Google Patents
Heating system for realizing deep decoupling of machine furnace and operation method Download PDFInfo
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- CN117803911A CN117803911A CN202410008567.7A CN202410008567A CN117803911A CN 117803911 A CN117803911 A CN 117803911A CN 202410008567 A CN202410008567 A CN 202410008567A CN 117803911 A CN117803911 A CN 117803911A
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000010438 heat treatment Methods 0.000 title claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000002918 waste heat Substances 0.000 claims abstract description 9
- 230000033228 biological regulation Effects 0.000 claims abstract description 6
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 3
- 230000001105 regulatory effect Effects 0.000 claims description 29
- 230000009977 dual effect Effects 0.000 claims description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 8
- 239000003546 flue gas Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 5
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims 1
- 239000008236 heating water Substances 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000005338 heat storage Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 206010010356 Congenital anomaly Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003828 downregulation Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention discloses a heat supply system for realizing deep decoupling of a machine furnace and an operation method thereof, wherein the system comprises a boiler system and a heat supply assembly, the boiler system comprises a steam drum, the heat supply assembly comprises a double-phase evaporator, a superheater and a low-temperature heat exchanger, water is heated into high-temperature steam through the double-phase evaporator and the superheater, the steam in the steam drum provides a heat source for the double-phase evaporator, low-temperature steam provides a heat source for the heat exchanger, and the low-temperature heat exchanger is used for recovering hydrophobic waste heat at an outlet end of a hot side of the double-phase evaporator. According to the invention, by extracting part of high-temperature steam in the boiler, the boiler is used for heating water to generate steam and then supplying heat to the outside, so that the steam entering the steam turbine to do work is reduced, the deep peak regulation performance of the unit is greatly improved while the industrial steam supply stability of the unit is ensured, and the deep decoupling of the boiler load and the steam turbine load is realized.
Description
Technical Field
The invention relates to the technical field of coal-fired power generation, in particular to a heating system for realizing deep decoupling of a machine furnace and an operation method.
Background
The cogeneration unit has the advantages of being congenital in the aspect of cascade utilization of energy, can greatly improve the heat efficiency of the coal-fired thermal power unit, reduce the total pollutant emission, is one of heat source forms with very stable, reliable and efficient heating in winter, and is also one of ideal heat sources for replacing a small coal-fired industrial boiler around a power plant. However, the cogeneration unit also shows strong thermoelectric coupling characteristics, further down regulation of the electric load cannot be realized due to the requirement of guaranteeing heat supply in the low-peak period of the electric load of the power grid, and full-load (electric load) operation cannot be carried out due to the requirement of heat supply in the high-load period of the power grid.
Currently applicable thermal-decoupling techniques can be divided into two categories, depending on the type of modification technique: one is an externally hung technology of an electric boiler, a heat storage device and the like, and the other is a steam turbine side heat supply modification technology of high back pressure, zero output, high and low bypass and the like. The initial investment cost of the externally hung heat storage technology is high, and the occupied area is large; the high back pressure, zero output, high and low bypass and other steam turbine side heat supply modification technologies often cause the safety problems of overtemperature of a reheater, overlarge final stage humidity, unbalanced axial thrust and the like during deep peak shaving.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent.
Therefore, the embodiment of the invention provides a heating system for realizing deep decoupling of a machine furnace and an operation method.
In one aspect, the present invention provides a heating system for implementing deep decoupling of a furnace, including:
a boiler system comprising a drum;
the heat supply assembly comprises a double-phase evaporator, a superheater and a low-temperature heat exchanger, the water supply is heated into high-temperature steam through the double-phase evaporator and the superheater, the steam in the steam drum provides a heat source for the double-phase evaporator, the low-temperature steam provides a heat source for the heat exchanger, and the low-temperature heat exchanger is used for recovering hydrophobic waste heat at the outlet end of the hot side of the double-phase evaporator.
In some embodiments, a part of steam in the steam drum is heated into main steam through boiler flue gas, and the other part of steam enters the dual-phase evaporator and the low-temperature heat exchanger in sequence for heat exchange and then enters the condenser.
In some embodiments, the hot side inlet end of the dual phase evaporator is connected to the steam outlet end of the steam drum, and the hot side outlet end of the dual phase evaporator is connected to the hot side inlet end of the cryogenic heat exchanger.
In some embodiments, the cold side inlet end of the dual-phase evaporator is connected to the feed pump outlet end, the cold side outlet end of the dual-phase evaporator is connected to the cold side inlet end of the superheater, and the cold side outlet end of the superheater is connected to the steam demand component.
In some embodiments, the hot side outlet end of the cryogenic heat exchanger is connected to the condenser inlet end, the cold side inlet end of the cryogenic heat exchanger is connected to the condensate pump outlet line, and the cold side outlet end of the cryogenic heat exchanger is connected to the deaerator inlet end.
In some embodiments, a steam regulating valve is provided on the line between the hot side inlet end of the dual phase evaporator and the steam outlet end of the drum.
In some embodiments, a pressure reducing valve is arranged on a pipeline between the condenser and the hot side outlet end of the cryogenic heat exchanger, and a water supply regulating valve is arranged on a pipeline between the cold side inlet end of the dual-phase evaporator and the water supply pump.
In some embodiments, the boiler system further comprises a high temperature reheater, a hot side outlet end of the superheater is connected with a cold side inlet end of the high temperature reheater, and low-re-steam sequentially enters the superheater and the high temperature reheater to be changed into hot re-steam after heat exchange.
In some embodiments, the boiler system further comprises a water cooled wall, and the liquid water in the drum is absorbed by the water cooled wall to evaporate into steam and then returns to the drum.
On the other hand, the invention provides an operation method of a heating system for realizing deep decoupling of a machine furnace, which comprises the following steps:
when the unit needs deep peak regulation, the boiler is kept in stable combustion load operation, and the opening degrees of the pressure reducing valve, the steam regulating valve and the water supply regulating valve are regulated, so that steam in the steam drum enters the dual-phase evaporator to heat water supply to generate steam, and condensed water is utilized to absorb the drainage waste heat of the dual-phase evaporator;
the steam at the cold side outlet of the double-phase evaporator enters the superheater and is heated again by low-pressure steam and then goes to the steam-requiring component.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, by extracting part of high-temperature steam in the boiler, the boiler is used for heating water to generate steam and then supplying heat to the outside, so that the steam entering the steam turbine to do work is reduced, the deep peak regulation performance of the unit is greatly improved while the industrial steam supply stability of the unit is ensured, and the deep decoupling of the boiler load and the steam turbine load is realized.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a heating system for realizing deep decoupling of a machine oven according to the present invention;
reference numerals illustrate:
the system comprises a water cooling wall 1, a steam drum 2, a low-temperature superheater 3, a screen superheater 4, a high-temperature superheater 5, a high-temperature reheater 6, a low-temperature heat exchanger 7, a double-phase evaporator 8, a superheater 9, a pressure reducing valve 10, a water supply regulating valve 11, a steam regulating valve 12 and a downcomer 13.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The heating system and the operation method for realizing deep decoupling of the machine furnace according to the embodiment of the invention are described below with reference to the accompanying drawings.
As shown in fig. 1, the heating system for realizing deep decoupling of the machine furnace comprises a boiler system and a heating assembly.
The boiler system comprises a steam drum 2, a water cooling wall 1, a low-temperature superheater 3, a screen-type superheater 4, a high-temperature superheater 5 and a high-temperature reheater 6, wherein the water cooling wall 1, the screen-type superheater 4, the high-temperature superheater 5, the high-temperature reheater 6 and the low-temperature superheater 3 are sequentially arranged according to a conventional flue gas flow, the water cooling wall 1 is arranged around a hearth, the screen-type superheater 4 is arranged at the upper part of the hearth, the high-temperature superheater 5 and the high-temperature reheater 6 are arranged behind the screen-type superheater 4 on a horizontal flue, and the low-temperature superheater 3 is arranged on a tail flue.
The liquid water in the steam drum 2 is absorbed by the water cooling wall 1 and evaporated into steam and then returns to the steam drum 2, specifically, as shown in fig. 1, a liquid water outlet in the steam drum 2 is connected with the upper end of the down pipe 13, the lower end outlet of the down pipe 13 is connected with the lower end inlet of the water cooling wall 1, the upper end outlet of the water cooling wall 1 is connected with the steam inlet of the steam drum 2, the liquid water in the steam drum 2 enters the water cooling wall 1 through the down pipe 13 to absorb the heat of the flue gas and become steam, and the steam enters the steam drum 2 from the steam inlet of the steam drum 2.
The heat supply assembly comprises a double-phase evaporator 8, a superheater 9 and a low-temperature heat exchanger 7, the feed water is heated into high-temperature steam through the double-phase evaporator 8 and the superheater 9, the steam in the steam drum 2 provides a heat source for the double-phase evaporator 8, the low-temperature heat exchanger 7 is used for recovering drain waste heat at the outlet end of the hot side of the double-phase evaporator 8, the low-temperature steam is steam at the outlet of the low-temperature reheater, and the low-temperature reheater is conventional use equipment of a boiler system.
One part of steam in the steam drum 2 is heated by boiler flue gas to be main steam, and the other part of steam sequentially enters the double-phase evaporator 8 and the low-temperature heat exchanger 7 for heat exchange and then enters the condenser. Specifically, a part of steam in the steam drum 2 sequentially enters the low-temperature superheater 3, the screen-type superheater 4 and the high-temperature superheater 5 to be heated by flue gas in the boiler to be main steam, and another part of steam in the steam drum 2 sequentially enters the two-phase evaporator 8 and the low-temperature heat exchanger 7 to release heat and then enters the condenser.
The hot side inlet end of the double-phase evaporator 8 is connected with the steam outlet end of the steam drum 2, and the hot side outlet end of the double-phase evaporator 8 is connected with the hot side inlet end of the low-temperature heat exchanger 7. The cold side inlet end of the double-phase evaporator 8 is connected with the outlet end of the water feeding pump, the cold side outlet end of the double-phase evaporator 8 is connected with the cold side inlet end of the superheater 9, and the cold side outlet end of the superheater 9 is connected with the steam-requiring component. The hot side outlet end of the low-temperature heat exchanger 7 is connected with the inlet end of the condenser, the cold side inlet end of the low-temperature heat exchanger 7 is connected with the outlet pipeline of the condensate pump, and the cold side outlet end of the low-temperature heat exchanger 7 is connected with the inlet end of the deaerator.
Specifically, a steam regulating valve 12 is arranged on a pipeline between a hot side inlet end of the dual-phase evaporator 8 and a steam outlet end of the steam drum 2, the steam quantity entering the dual-phase evaporator 8 is regulated by the steam regulating valve 12, a pressure reducing valve 10 is arranged on a pipeline between the condenser and a hot side outlet end of the low-temperature heat exchanger 7, the pressure of fluid entering the condenser is regulated by the pressure reducing valve 10, a water supply regulating valve 11 is arranged on a pipeline between a cold side inlet end of the dual-phase evaporator 8 and a water supply pump, and the water supply flow entering the dual-phase evaporator 8 is regulated by the water supply regulating valve 11. The hot side inlet end of the double-phase evaporator 8 is connected with the steam outlet end of the steam drum 2 through a steam regulating valve 12, the hot side outlet end of the double-phase evaporator 8 is connected with the hot side inlet end of the low-temperature heat exchanger 7, the cold side inlet end of the double-phase evaporator 8 is connected with the water feeding pump outlet end through a water feeding regulating valve 11, the cold side outlet end of the double-phase evaporator 8 is connected with the cold side inlet end of the superheater 9, steam in the steam drum 2 enters the hot side of the double-phase evaporator 8 through the steam regulating valve 12, water feeding pump outlet comes into the cold side of the double-phase evaporator 8 through the water feeding regulating valve 11, the steam on the hot side in the double-phase evaporator 8 exchanges heat with water feeding on the cold side of the double-phase evaporator, the steam after heat exchange becomes the hot side of the low-temperature heat exchanger 7, and the water after heat exchange becomes the steam enters the cold side of the superheater 9.
The hot side inlet end of the low-temperature heat exchanger 7 is connected with the hot side outlet end of the double-phase evaporator 8, the hot side outlet end of the low-temperature heat exchanger 7 is connected with the inlet end of the condenser through the pressure reducing valve 10, the cold side inlet end of the low-temperature heat exchanger 7 is connected with the outlet end of the condensate pump, the cold side outlet end of the low-temperature heat exchanger 7 is connected with the inlet end of the deaerator, the drain water flowing out of the hot side outlet end of the double-phase evaporator 8 enters the hot side of the low-temperature heat exchanger 7, the drain water from the condensate pump enters the cold side of the low-temperature heat exchanger 7, the drain water at the hot side exchanges heat with the drain water at the cold side of the low-temperature heat exchanger 7, and the drain waste heat is recovered by utilizing the drain water, so that heat waste is avoided. The heat exchanged drain water enters the condenser through the pressure reducing valve 10, and the heat exchanged condensate water enters the deaerator after being heated. Wherein, condenser, deaerator, condensate pump and feed water pump are the equipment commonly used in power generation system, and this is not repeated here.
The cold side inlet end of the superheater 9 is connected with the cold side outlet end of the double-phase evaporator 8, the cold side outlet end of the superheater 9 is connected with a steam-required component, the hot side inlet end of the superheater 9 is connected with the low-temperature reheater outlet end, the hot side outlet end of the superheater 9 is connected with the cold side inlet end of the high-temperature reheater 6, steam at the cold side outlet end of the double-phase evaporator 8 enters the cold side of the superheater 9, and low-temperature steam at the low-temperature reheater outlet end enters the hot side of the superheater 9. In the superheater 9, the low-pressure steam on the hot side exchanges heat with the steam on the cold side, and the heat exchanged steam is further heated to high-temperature steam, so that the superheat degree of the steam at the outlet of the dual-phase evaporator 8 is improved, and the heated steam is sent to a steam-demand component, for example, the heated steam is used for supplying industrial steam. The low-temperature re-entering steam after heat exchange enters a high-temperature reheater 6, and is heated into hot re-entering steam by boiler flue gas in the high-temperature reheater 6.
The operation method of the heating system for realizing the deep decoupling of the machine furnace, which is disclosed by the invention, comprises the following steps of:
when the unit needs deep peak regulation, the boiler is kept in stable combustion load operation, and the opening of a pressure reducing valve 10, a steam regulating valve 12 and a water supply regulating valve 11 are regulated, so that steam in the steam drum 2 enters the dual-phase evaporator 8 to heat water to generate steam, and condensed water is utilized to absorb drainage waste heat of the dual-phase evaporator 8;
the cold side outlet steam of the double-phase evaporator 8 enters the superheater 9 and is heated again by low-pressure steam and then goes to the steam-requiring component.
Specifically, when deep peak regulation is needed by a unit, the boiler is kept in stable combustion load operation, and the opening of a pressure reducing valve 10, a steam regulating valve 12 and a water supply regulating valve 11 are regulated, so that steam in a steam drum 2 enters a double-phase evaporator 8 to heat a water supply pump to generate steam, and after heat exchange, condensed water is utilized to absorb drainage waste heat of the double-phase evaporator 8; the outlet steam of the low-temperature reheater enters the superheater 9 to heat the outlet steam of the double-phase evaporator 8, the superheat degree of the outlet steam of the double-phase evaporator 8 is improved, the outlet steam of the hot side of the superheater 9 enters the high-temperature reheater 6 to generate hot regenerated steam after being heated by flue gas, and the outlet steam of the cold side of the superheater 9 is used for supplying industrial steam.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present invention. In this specification, schematic representations of the above terms may be directed to different embodiments or examples. 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, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A heating system for implementing deep decoupling of a furnace, comprising:
a boiler system comprising a drum;
the heat supply assembly comprises a double-phase evaporator, a superheater and a low-temperature heat exchanger, the water supply is heated into high-temperature steam through the double-phase evaporator and the superheater, the steam in the steam drum provides a heat source for the double-phase evaporator, the low-temperature steam provides a heat source for the heat exchanger, and the low-temperature heat exchanger is used for recovering hydrophobic waste heat at the outlet end of the hot side of the double-phase evaporator.
2. The system of claim 1, wherein a portion of the steam in the drum is heated by the boiler flue gas to be the main steam, and another portion of the steam enters the dual-phase evaporator and the cryogenic heat exchanger in sequence for heat exchange and then enters the condenser.
3. The system of claim 2, wherein a hot side inlet end of the dual phase evaporator is connected to a steam outlet end of the drum, and wherein a hot side outlet end of the dual phase evaporator is connected to a hot side inlet end of the cryogenic heat exchanger.
4. The system of claim 3, wherein the cold side inlet end of the dual phase evaporator is connected to a feedwater pump outlet end, the cold side outlet end of the dual phase evaporator is connected to the cold side inlet end of the superheater, and the cold side outlet end of the superheater is connected to a steam demand assembly.
5. The system of claim 3, wherein a hot side outlet end of the cryogenic heat exchanger is connected to the condenser inlet end, a cold side inlet end of the cryogenic heat exchanger is connected to a condensate pump outlet line, and a cold side outlet end of the cryogenic heat exchanger is connected to a deaerator inlet end.
6. A system according to claim 3, wherein a steam regulating valve is provided in the line between the hot side inlet end of the dual phase evaporator and the steam outlet end of the drum.
7. The system of claim 4, wherein a pressure reducing valve is disposed in a line between the condenser and the hot side outlet of the cryogenic heat exchanger, and a feedwater regulating valve is disposed in a line between the cold side inlet of the dual phase evaporator and the feedwater pump.
8. The system of claim 1, wherein the boiler system further comprises a high temperature reheater, a hot side outlet end of the superheater is connected to a cold side inlet end of the high temperature reheater, and low re-entering steam sequentially enters the superheater and the high temperature reheater to exchange heat and become hot re-steam.
9. The system of claim 1, wherein the boiler system further comprises a water wall, and wherein the liquid water in the drum is vaporized into steam by heat absorption by the water wall and then returned to the drum.
10. A method of operating a heating system for achieving deep decoupling of a furnace, suitable for use in a system according to any one of claims 1 to 9, comprising the steps of:
when the unit needs deep peak regulation, the boiler is kept in stable combustion load operation, and the opening degrees of the pressure reducing valve, the steam regulating valve and the water supply regulating valve are regulated, so that steam in the steam drum enters the dual-phase evaporator to heat water supply to generate steam, and condensed water is utilized to absorb the drainage waste heat of the dual-phase evaporator;
the steam at the cold side outlet of the double-phase evaporator enters the superheater and is heated again by low-pressure steam and then goes to the steam-requiring component.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410008567.7A CN117803911A (en) | 2024-01-03 | 2024-01-03 | Heating system for realizing deep decoupling of machine furnace and operation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410008567.7A CN117803911A (en) | 2024-01-03 | 2024-01-03 | Heating system for realizing deep decoupling of machine furnace and operation method |
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| CN202410008567.7A Pending CN117803911A (en) | 2024-01-03 | 2024-01-03 | Heating system for realizing deep decoupling of machine furnace and operation method |
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| CN (1) | CN117803911A (en) |
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