CN108167807B - Drainage system of steam-air preheater of garbage incineration power plant - Google Patents
Drainage system of steam-air preheater of garbage incineration power plant Download PDFInfo
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- CN108167807B CN108167807B CN201810001463.8A CN201810001463A CN108167807B CN 108167807 B CN108167807 B CN 108167807B CN 201810001463 A CN201810001463 A CN 201810001463A CN 108167807 B CN108167807 B CN 108167807B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000004056 waste incineration Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000002209 hydrophobic effect Effects 0.000 claims description 10
- 229920006395 saturated elastomer Polymers 0.000 claims description 8
- 238000009792 diffusion process Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 239000002253 acid Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
Abstract
The invention belongs to the technical field of garbage incineration power plants, and particularly relates to a drainage system of a steam-air preheater of a garbage incineration power plant, which comprises the steam-air preheater, a drainage expansion vessel and a deaerator; the steam-air preheater is internally divided into a high-pressure section and a low-pressure section; the inlet of the high-pressure section is communicated with a high-pressure steam inlet pipe, and the outlet of the high-pressure section is communicated with the drainage inlet of the drainage expansion vessel; an inlet of the low-pressure section is communicated with a low-pressure steam inlet pipe, and an outlet of the low-pressure section is communicated with a low-pressure drainage inlet of the deaerator; and the drain outlet of the drain flash tank is communicated with the high-pressure drain inlet of the deaerator. The drainage expansion vessel in the drainage system of the steam-air preheater of the waste incineration power plant provides recovered steam, saves steam consumption, reduces drainage pressure entering the deaerator, reduces steam-water loss and operation vibration, and can ensure normal production of a main process system of the waste incineration.
Description
Technical Field
The invention belongs to the technical field of garbage incineration power plants, and particularly relates to a drainage system of a steam-air preheater of a garbage incineration power plant.
Background
With the rapid development of Chinese economy, the quality of garbage is continuously improved, and the garbage incineration can realize the reduction, harmless and recycling of garbage treatment, so that the method becomes one of the most effective methods for treating garbage, and the method can not only utilize the heat value to generate electricity and change waste into valuables, but also reduce the landfill of garbage and greatly reduce the pollution of garbage to the environment. Because the flue gas generated by the garbage incineration contains a large amount of acid gas components, low-temperature corrosion is easy to generate, a steam air preheater is generally arranged, and steam is utilized to heat air to be above the dew point of the acid gas, so that the purposes of reducing the low-temperature corrosion and improving the efficiency of a boiler are achieved.
At present, in order to improve the heat efficiency of the whole plant, most of the drainage generated after the high-pressure steam of the garbage incineration power plant is heated directly enters the deaerator, and the higher the high-pressure drainage temperature is, the lower the deaerator temperature is, the higher the temperature difference is, the lower the heat exchange efficiency is, so that the high-quality steam consumption is larger; and the high-temperature drainage generated after the steam air preheater heats the air enters the deaerator, so that the steam air preheater is low in efficiency, the high-pressure drainage directly enters the deaerator, self boiling of the deaerator is easy to cause, the pressure in the deaerator is increased, the steam-water loss is increased, and vibration is easy to occur during operation.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a drainage system of a steam-air preheater of a waste incineration power plant, which can reduce drainage pressure entering a deaerator, reduce steam-water loss and operation vibration and ensure normal production of a main process system of the waste incineration.
In order to achieve the aim, the technical scheme of the invention is that the drainage system of the steam-air preheater of the garbage incineration power plant comprises the steam-air preheater, a drainage expansion vessel and a deaerator; the steam-air preheater is internally divided into a high-pressure section and a low-pressure section; the inlet of the high-pressure section is communicated with a high-pressure steam inlet pipe, and the outlet of the high-pressure section is communicated with the drainage inlet of the drainage expansion vessel; an inlet of the low-pressure section is communicated with a low-pressure steam inlet pipe, and an outlet of the low-pressure section is communicated with a low-pressure drainage inlet of the deaerator; and the drain outlet of the drain flash tank is communicated with the high-pressure drain inlet of the deaerator.
Further, a steam outlet of the drainage expander is communicated with the low-pressure steam inlet pipe.
Further, the steam-air preheater further comprises a condensing section; the outlet of the low-pressure section is communicated with the inlet of the condensing section; and the outlet of the condensing section is communicated with the low-pressure drain inlet of the deaerator.
Further, a drain outlet of the drain flash tank is communicated with a high-pressure drain inlet of the deaerator through a first pipeline; the first pipeline is provided with a first valve.
Further, the first conduit communicates with the inlet of the condensing section through a second conduit.
Further, a second valve is arranged on the second pipeline.
Further, the junction of the first pipe and the second pipe is located between the first valve and the hydrophobic diffusion vessel.
Compared with the prior art, the invention has the beneficial effects that:
the drainage expansion vessel in the drainage system of the steam-air preheater of the waste incineration power plant provides recovered steam, saves steam consumption, reduces drainage pressure entering the deaerator, reduces steam-water loss and operation vibration, and can ensure normal production of a main process system of the waste incineration.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a steam-air preheater drainage system of a waste incineration power plant according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a steam-air preheater drainage system of a waste incineration power plant according to an embodiment of the present invention;
in the figure: 1.2 parts of steam-air preheater, 2 parts of drainage expansion vessel, 3 parts of deaerator, 4 parts of high-pressure section, 5 parts of low-pressure section, 6 parts of condensing section, 7 parts of first valve, 8 parts of second valve, 9 parts of high-pressure steam inlet pipe, 10 parts of low-pressure steam inlet pipe, 11 parts of first pipeline, 12 parts of second pipeline.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the embodiment of the invention provides a steam-air preheater drainage system of a garbage incineration power plant, which comprises a steam-air preheater 1, a drainage diffuser 2 and a deaerator 3; the steam-air preheater 1 is internally divided into a high-pressure section 4 and a low-pressure section 5; the inlet of the high-pressure section 4 is communicated with a high-pressure steam inlet pipe 9, and the outlet of the high-pressure section 4 is communicated with the drain inlet of the drain flash tank 2; the inlet of the low-pressure section 5 is communicated with a low-pressure steam inlet pipe 10, and the outlet of the low-pressure section 5 is communicated with a low-pressure drain inlet of the deaerator 3; the drain outlet of the drain flash tank 2 is communicated with the high-pressure drain inlet of the deaerator 3.
The steam-air preheater 1 can be vertical or horizontal, and the length or width of the high-pressure section 4 and the low-pressure section 5 depend on the required heat exchange area; since the steam-air preheater 1 heats air by utilizing the vaporization latent heat of steam, the heat exchange area is proportional to the heat exchange amount, and the heat exchange amount depends on the parameters (temperature and pressure) and flow rate of the inlet steam, under the condition that the rest of external conditions are unchanged, it is generally the case that the high pressure section 4 is longer or higher than the low pressure section 5. The hydrophobic parameter passing through the hydrophobic diffusion vessel 2 is related to the design pressure of the hydrophobic diffusion vessel 2, the hydrophobic outlet of the hydrophobic diffusion vessel 2 has a hydrophobic pressure of 0.8-1.2 MPa and a hydrophobic temperature of 175.4-191.6 ℃.
The drainage expansion vessel in the drainage system of the steam-air preheater of the waste incineration power plant provides recovered steam, saves steam consumption, reduces drainage pressure entering the deaerator, reduces steam-water loss and operation vibration, and can ensure normal production of a main process system of the waste incineration.
Further, the steam outlet of the drain flash tank 2 is communicated with the low-pressure steam inlet pipe 10.
As shown in fig. 1, high-pressure steam and low-pressure steam in the drainage system of the steam-air preheater of the garbage incineration power plant are respectively communicated with the inlet of the high-pressure section 4 and the inlet of the low-pressure section 5 of the steam-air preheater 1 through a high-pressure steam inlet pipe 9 and a low-pressure steam inlet pipe 10; after the high-pressure steam enters the high-pressure section 4 of the steam-air preheater 1 and exchanges heat, the high-pressure steam enters the drainage flash tank 2, part of the high-pressure steam is flashed into steam due to pressure reduction, and the other part of the high-pressure steam becomes saturated drainage under the current pressure; the flash steam enters a low-pressure steam inlet pipe 10 from a steam outlet of the drainage flash tank 2, enters a low-pressure section 5 of the steam-air preheater 1 together with the low-pressure steam for continuous heat exchange, and the residual drainage enters the deaerator 3; the low-pressure steam enters the deaerator 3 after heat exchange in the low-pressure section 5 of the steam-air preheater 1.
Further, as shown in fig. 2, the steam-air preheater 1 further comprises a condensing section 6; the outlet of the low-pressure section 5 is communicated with the inlet of the condensing section 6; the outlet of the condensing section 6 is communicated with the low-pressure drain inlet of the deaerator 3.
After the low-pressure steam enters the low-pressure section 5 for heat exchange, saturated water is discharged by utilizing the vaporization latent heat of the steam, namely, the temperature is unchanged, and only the medium is changed from steam into saturated water; the saturated water passes through the condensing section 6 and then undergoes heat exchange, and the temperature is reduced and then enters the deaerator 3.
Further, the drain outlet of the drain flash tank 2 is communicated with the high-pressure drain inlet of the deaerator 3 through a first pipeline 11; the first pipeline 11 is provided with a first valve 7.
Further, the first pipe 11 communicates with the inlet of the condensing section 6 through a second pipe 12.
Further, a second valve 8 is arranged on the second pipeline 12
Further, the junction of the first pipe 11 and the second pipe 12 is located between the first valve 7 and the hydrophobic diffusion vessel 2.
As shown in fig. 2, the high-pressure steam and the low-pressure steam in the drainage system of the steam-air preheater of the garbage incineration power plant are respectively communicated with the inlet of the high-pressure section 4 and the inlet of the low-pressure section 5 of the steam-air preheater 1 through a high-pressure steam inlet pipe 9 and a low-pressure steam inlet pipe 10; after the high-pressure steam enters the high-pressure section 4 of the steam-air preheater 1 and exchanges heat, the high-pressure steam enters the drainage flash tank 2, part of the high-pressure steam is flashed into steam due to pressure reduction, and the other part of the high-pressure steam becomes saturated drainage under the current pressure; the flash steam enters a low-pressure steam inlet pipe 10 from a steam outlet of the drainage flash tank 2, enters a low-pressure section 5 of the steam-air preheater 1 together with the low-pressure steam for continuous heat exchange, and the rest drainage enters a deaerator 3 to remove oxygen and other non-condensable gases; the low-pressure steam enters a condensing section 6 after heat exchange in a low-pressure section 5 of the steam-air preheater 1, then enters a deaerator 3 to remove gas after temperature reduction; when the first valve 7 is closed, the second valve 8 is opened, the drain water from the drain flash tank 2 can be converged with saturated water from the low-pressure section 5 of the steam-air preheater 1 and enter the steam-air preheater 6 for heat exchange; when the temperature of the deaerator is too low, the second valve 8 is closed, the first valve 7 is opened, and the drain water separated by the drain flash tank 2 directly enters the deaerator 3.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (2)
1. The operation method of the steam-air preheater drainage system of the garbage incineration power plant is characterized by comprising the following steps of: the system comprises a steam-air preheater (1), a drainage flash tank (2) and a deaerator (3); the steam-air preheater (1) is internally divided into a high-pressure section (4) and a low-pressure section (5); the inlet of the high-pressure section (4) is communicated with a high-pressure steam inlet pipe (9), and the outlet of the high-pressure section (4) is communicated with the drainage inlet of the drainage expansion vessel (2); an inlet of the low-pressure section (5) is communicated with a low-pressure steam inlet pipe (10), and an outlet of the low-pressure section (5) is communicated with a low-pressure drainage inlet of the deaerator (3); the drain outlet of the drain flash tank (2) is communicated with the high-pressure drain inlet of the deaerator (3); the steam-air preheater (1) further comprises a condensing section (6); the outlet of the low-pressure section (5) is communicated with the inlet of the condensing section (6); the outlet of the condensing section (6) is communicated with a low-pressure drain inlet of the deaerator (3); the drain outlet of the drain flash tank (2) is communicated with the high-pressure drain inlet of the deaerator (3) through a first pipeline (11); a first valve (7) is arranged on the first pipeline (11); the first pipeline (11) is communicated with the inlet of the condensing section (6) through a second pipeline (12); a second valve (8) is arranged on the second pipeline (12); the joint of the first pipeline (11) and the second pipeline (12) is positioned between the first valve (7) and the hydrophobic diffusion vessel (2);
the operation method of the system comprises the following steps: the high-pressure steam and the low-pressure steam are respectively communicated with the inlet of the high-pressure section (4) and the inlet of the low-pressure section (5) of the steam-air preheater (1) through a high-pressure steam inlet pipe (9) and a low-pressure steam inlet pipe (10); after the high-pressure steam enters a high-pressure section (4) of the steam-air preheater (1) for heat exchange and enters a drainage flash tank (2), part of the high-pressure steam is flashed into steam due to pressure reduction, and the other part of the high-pressure steam becomes saturated drainage under the current pressure; the flash steam enters a low-pressure steam inlet pipe 10 from a steam outlet of the drainage flash tank (2) and enters a low-pressure section (5) of the steam-air preheater (1) together with the low-pressure steam for continuous heat exchange, and the residual drainage enters a deaerator (3) to remove oxygen and other non-condensable gases; the low-pressure steam enters a condensing section (6) after heat exchange in a low-pressure section (5) of the steam-air preheater (1), then enters a deaerator (3) to remove gas after temperature reduction; when the first valve (7) is closed and the second valve (8) is opened, the water discharged from the water discharge expander (2) can be converged with saturated water discharged from the low-pressure section (5) of the steam-air preheater (1) and then enters the condensing section (6) for heat exchange; when the temperature of the deaerator is too low, the second valve (8) is closed, the first valve (7) is opened, and the drain water separated by the drain flash tank (2) directly enters the deaerator (3).
2. A method of operating a steam-air preheater drain system for a waste incineration power plant as claimed in claim 1, characterised in that: the steam outlet of the drainage expansion vessel (2) is communicated with the low-pressure steam inlet pipe (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810001463.8A CN108167807B (en) | 2018-01-02 | 2018-01-02 | Drainage system of steam-air preheater of garbage incineration power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810001463.8A CN108167807B (en) | 2018-01-02 | 2018-01-02 | Drainage system of steam-air preheater of garbage incineration power plant |
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| Publication Number | Publication Date |
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| CN108167807A CN108167807A (en) | 2018-06-15 |
| CN108167807B true CN108167807B (en) | 2024-03-19 |
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| CN201810001463.8A Active CN108167807B (en) | 2018-01-02 | 2018-01-02 | Drainage system of steam-air preheater of garbage incineration power plant |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109538920B (en) * | 2018-10-17 | 2024-04-09 | 苏州颜吉通新能源科技有限公司 | Air preheater drainage system for garbage incineration power generation |
| CN109654474A (en) * | 2019-01-21 | 2019-04-19 | 成都市兴蓉再生能源有限公司 | Residual neat recovering system for refuse-burning plant hydrophobic development unit |
| CN109798536A (en) * | 2019-03-15 | 2019-05-24 | 广州特种承压设备检测研究院 | Steam air preheating device and system |
| CN110578932A (en) * | 2019-03-31 | 2019-12-17 | 上海康恒环境股份有限公司 | novel steam flue gas preheater |
| CN110566933A (en) * | 2019-09-19 | 2019-12-13 | 中国能源建设集团广东省电力设计研究院有限公司 | Multi-stage expansion heating assembly |
| CN112484073B (en) * | 2020-11-30 | 2023-04-21 | 光大环保技术装备（常州）有限公司 | Steam air preheating system and method for waste incineration industry |
| CN114183741B (en) * | 2021-12-16 | 2022-10-04 | 南通万达能源动力科技有限公司 | Multi-heat-source adjusting system for waste incineration boiler |
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| CN108167807A (en) | 2018-06-15 |
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