CN112781025A - Direct-flow steam-water system for waste heat boiler and use method thereof - Google Patents
Direct-flow steam-water system for waste heat boiler and use method thereof Download PDFInfo
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- CN112781025A CN112781025A CN202011610959.9A CN202011610959A CN112781025A CN 112781025 A CN112781025 A CN 112781025A CN 202011610959 A CN202011610959 A CN 202011610959A CN 112781025 A CN112781025 A CN 112781025A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 165
- 239000002918 waste heat Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 17
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims description 17
- 238000005086 pumping Methods 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 3
- 239000013589 supplement Substances 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000003134 recirculating effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/26—Steam-separating arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/34—Adaptations of boilers for promoting water circulation
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/12—Controlling superheat temperature by attemperating the superheated steam, e.g. by injected water sprays
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
A direct-flow steam-water system for a waste heat boiler and a use method thereof relate to a direct-flow steam-water system for a waste heat boiler and a use method thereof. The invention aims to solve the problems that the natural circulation start-stop speed of the existing double-pressure and three-pressure waste heat boiler is limited, the unit is not convenient to start and stop quickly and frequently, a conventional direct-current steam-water system has high-temperature working medium loss and waste, the system needs a large amount of water supplement, and the operation economy is low. The method comprises the following steps: working media in a low-pressure steam pocket sequentially pass through a high-pressure economizer and a high-pressure evaporator and enter a steam-water separator, the steam-water separator separates the working media, saturated steam enters a high-pressure superheater and is further heated to form superheated steam, and then the superheated steam enters a main steam pipeline and is supplied with steam to the outside after reaching required temperature and pressure parameters; the saturated water returns to the low-pressure steam drum through the drain valve under the action of the pressure difference between the steam-water separator and the low-pressure steam drum. The invention can obtain a once-through steam-water system for a waste heat boiler and a using method thereof.
Description
Technical Field
The invention relates to a once-through steam-water system for a waste heat boiler and a using method thereof.
Background
The large combined cycle unit is often used for a peak shaving unit, has the operation characteristic of frequent and quick start, and a matched waste heat boiler usually adopts a three-pressure or double-pressure system, wherein the high-pressure system is usually in a high-pressure, ultrahigh-pressure or subcritical pressure grade. At present, natural circulation is generally adopted in a steam-water system of a combined cycle waste heat boiler, each pressure system is provided with a steam drum, the starting speed of a unit is limited by the heating speed of a thick-wall element of the high-pressure steam drum, and the quick and frequent starting and stopping of the unit are not facilitated. In the existing direct current technology, a high-pressure system starts drain water and conveys the drain water to a flash tank, the drain water is directly discharged after flash tank expansion, high-temperature working media have large loss and waste, meanwhile, the system needs a large amount of water supplement, the operation economy is low, and the direct current technology is not suitable for being applied to double-pressure and triple-pressure waste heat boilers.
Disclosure of Invention
The invention aims to solve the problems that the natural circulation start-stop speed of the existing double-pressure and three-pressure waste heat boiler is limited, the unit is not convenient to start and stop quickly and frequently, a conventional direct-flow steam-water system has high-temperature working medium loss and waste, the system needs a large amount of water supplement, and the running economy is low, and provides a direct-flow steam-water system for the waste heat boiler and a using method thereof.
A direct-current steam-water system for a waste heat boiler comprises a low-pressure steam drum, a high-pressure economizer, a high-pressure evaporator, a steam-water separator, a high-pressure superheater and a main steam pipeline, wherein a water outlet of the low-pressure steam drum is communicated with a water inlet of the high-pressure economizer through a pipeline, and a high-pressure water feed pump is arranged on the pipeline; the water outlet of the high-pressure economizer is communicated with the water inlet of the high-pressure evaporator through a pipeline, the water outlet of the high-pressure evaporator is communicated with the water inlet of the steam-water separator through a pipeline, the steam outlet of the steam-water separator is communicated with the steam inlet of the high-pressure superheater through a pipeline, the steam outlet of the high-pressure superheater is communicated with the main steam pipeline through a pipeline, and steam is supplied to the outside after the required temperature and pressure parameters are reached; the water outlet of the steam-water separator is communicated with the water inlet of the drain valve through a pipeline, and the water outlet of the drain valve is communicated with the water inlet of the low-pressure steam drum through a pipeline.
A using method of a direct-current steam-water system for a waste heat boiler is completed according to the following steps:
at the initial stage of starting the equipment, pumping working media in a low-pressure steam pocket into a high-pressure economizer through a high-pressure water supply pump, heating the working media by the high-pressure economizer, then entering a high-pressure evaporator for continuous heating, entering a steam-water separator after the working media are heated by the high-pressure evaporator, separating the working media into saturated steam and saturated water by the steam-water separator, entering the saturated steam into a high-pressure superheater for further heating to form superheated steam, then entering a main steam pipeline, and supplying steam to the outside after reaching a required temperature and pressure parameter; saturated water returns to the low-pressure steam drum through the drain valve under the action of the pressure difference between the steam-water separator and the low-pressure steam drum, and meanwhile, the water level of the low-pressure steam drum is kept balanced by adjusting the valve openness of the high-pressure water supply pump and the drain valve;
when the direct-current steam-water system reaches a direct-current load, all the outlets of the high-pressure evaporator are superheated steam, then the superheated steam enters the high-pressure superheater through the steam-water separator for further heating, and finally enters the main steam pipeline; at this time, the trap on the steam separator line is closed.
The invention has the beneficial effects that:
(1) the invention relates to a direct-flow steam-water system for a waste heat boiler and a using method thereof.A high-pressure steam pocket is cancelled, a high-pressure water supply pump is used for replacing a conventional direct-flow boiler recirculating pump, and a set of direct-flow steam-water system is formed by the high-pressure water supply pump, a high-pressure economizer, a steam-water separator, a high-pressure superheater and a main steam pipeline; saturated water can be recovered and recycled, and the problem that a large amount of water is required by a traditional direct-current steam-water system is solved.
(2) Compared with the traditional natural circulation, the invention cancels a thick-wall high-pressure steam drum, and the thin-wall element of the invention can accelerate the starting speed of the boiler and meet the requirement of quick and frequent starting and stopping of the unit; meanwhile, compared with a high-pressure steam drum, a flash tank, a circulating pump and complex pipeline arrangement in natural circulation and traditional direct-flow steam-water systems, the direct-flow steam-water system greatly reduces the consumption of metal used by the boiler and reduces the production cost.
The invention can obtain a once-through steam-water system for a waste heat boiler and a using method thereof.
Drawings
Fig. 1 is a schematic operation flow diagram of a once-through steam-water system for a waste heat boiler in embodiment 1, wherein a represents saturated steam, and B represents saturated water.
Detailed Description
The first embodiment is as follows: the direct-flow steam-water system for the waste heat boiler comprises a low-pressure steam drum, a high-pressure economizer, a high-pressure evaporator, a steam-water separator, a high-pressure superheater and a main steam pipeline, wherein a water outlet of the low-pressure steam drum is communicated with a water inlet of the high-pressure economizer through a pipeline, and a high-pressure water feed pump is arranged on the pipeline; the water outlet of the high-pressure economizer is communicated with the water inlet of the high-pressure evaporator through a pipeline, the water outlet of the high-pressure evaporator is communicated with the water inlet of the steam-water separator through a pipeline, the steam outlet of the steam-water separator is communicated with the steam inlet of the high-pressure superheater through a pipeline, the steam outlet of the high-pressure superheater is communicated with the main steam pipeline through a pipeline, and steam is supplied to the outside after the required temperature and pressure parameters are reached; the water outlet of the steam-water separator is communicated with the water inlet of the drain valve through a pipeline, and the water outlet of the drain valve is communicated with the water inlet of the low-pressure steam drum through a pipeline.
The second embodiment is as follows: the present embodiment differs from the present embodiment in that: the waste heat boiler is a double-pressure waste heat boiler or a three-pressure waste heat boiler.
Other steps are the same as those in the first embodiment.
The third concrete implementation mode: the application method of the direct-current steam-water system for the waste heat boiler comprises the following steps:
at the initial stage of starting the equipment, pumping working media in a low-pressure steam pocket into a high-pressure economizer through a high-pressure water supply pump, heating the working media by the high-pressure economizer, then entering a high-pressure evaporator for continuous heating, entering a steam-water separator after the working media are heated by the high-pressure evaporator, separating the working media into saturated steam and saturated water by the steam-water separator, entering the saturated steam into a high-pressure superheater for further heating to form superheated steam, then entering a main steam pipeline, and supplying steam to the outside after reaching a required temperature and pressure parameter; saturated water returns to the low-pressure steam drum through the drain valve under the action of the pressure difference between the steam-water separator and the low-pressure steam drum, and meanwhile, the water level of the low-pressure steam drum is kept balanced by adjusting the valve openness of the high-pressure water supply pump and the drain valve;
when the direct-current steam-water system reaches a direct-current load, all the outlets of the high-pressure evaporator are superheated steam, then the superheated steam enters the high-pressure superheater through the steam-water separator for further heating, and finally enters the main steam pipeline; at this time, the trap on the steam separator line is closed.
The beneficial effects of the embodiment are as follows:
(1) the embodiment of the direct-flow steam-water system for the waste heat boiler and the use method thereof, a high-pressure steam pocket is cancelled, a high-pressure water supply pump is used for replacing a conventional direct-flow boiler recirculating pump, and a set of direct-flow steam-water system is formed by the high-pressure water supply pump, a high-pressure economizer, a high-pressure evaporator, a steam-water separator, a high-pressure superheater and a main steam pipeline; saturated water can be recovered and recycled, and the problem that a large amount of water is required by a traditional direct-current steam-water system is solved.
(2) Compared with the traditional natural circulation, the invention cancels a thick-wall high-pressure steam drum, and the thin-wall element of the invention can accelerate the starting speed of the boiler and meet the requirement of quick and frequent starting and stopping of the unit; meanwhile, compared with natural circulation and high-pressure steam drums, flash tanks, circulating pumps and complex pipeline arrangement in the traditional direct-flow steam-water system, the direct-flow steam-water system greatly reduces metal consumption of boilers and reduces production cost.
The fourth concrete implementation mode: the third difference between the present embodiment and the specific embodiment is: the working medium in the low-pressure steam drum is boiler water.
The other steps are the same as those in the third embodiment.
The fifth concrete implementation mode: the third or fourth difference between the present embodiment and the specific embodiment is: and when the direct-current steam-water system reaches a direct-current load, adjusting the temperature of the superheated steam by adopting a mode of adjusting the water supply quantity or spraying water for reducing the temperature.
The other steps are the same as those of the third or fourth embodiment.
The following examples were used to demonstrate the beneficial effects of the present invention:
example 1: a direct-current steam-water system for a waste heat boiler comprises a low-pressure steam drum, a high-pressure economizer, a high-pressure evaporator, a steam-water separator, a high-pressure superheater and a main steam pipeline, wherein a water outlet of the low-pressure steam drum is communicated with a water inlet of the high-pressure economizer through a pipeline, and a high-pressure water feed pump is arranged on the pipeline; the water outlet of the high-pressure economizer is communicated with the water inlet of the high-pressure evaporator through a pipeline, the water outlet of the high-pressure evaporator is communicated with the water inlet of the steam-water separator through a pipeline, the steam outlet of the steam-water separator is communicated with the steam inlet of the high-pressure superheater through a pipeline, the steam outlet of the high-pressure superheater is communicated with the main steam pipeline through a pipeline, and steam is supplied to the outside after the required temperature and pressure parameters are reached; the water outlet of the steam-water separator is communicated with the water inlet of the drain valve through a pipeline, and the water outlet of the drain valve is communicated with the water inlet of the low-pressure steam drum through a pipeline.
The waste heat boiler is a double-pressure waste heat boiler or a three-pressure waste heat boiler.
The use method of the direct-current steam-water system for the waste heat boiler is completed according to the following steps:
at the initial stage of starting the equipment, pumping working media in a low-pressure steam pocket into a high-pressure economizer through a high-pressure water supply pump, heating the working media by the high-pressure economizer, then entering a high-pressure evaporator for continuous heating, entering a steam-water separator after the working media are heated by the high-pressure evaporator, separating the working media into saturated steam and saturated water by the steam-water separator, entering the saturated steam into a high-pressure superheater for further heating to form superheated steam, then entering a main steam pipeline, and supplying steam to the outside after reaching a required temperature and pressure parameter; saturated water returns to the low-pressure steam drum through the drain valve under the action of the pressure difference between the steam-water separator and the low-pressure steam drum, and meanwhile, the water level of the low-pressure steam drum is kept balanced by adjusting the valve openness of the high-pressure water supply pump and the drain valve;
when the direct-current steam-water system reaches a direct-current load, all the outlets of the high-pressure evaporator are superheated steam, then the superheated steam enters the high-pressure superheater for further heating, and finally enters the main steam pipeline; at this time, the trap on the steam separator line is closed. And when the direct-current steam-water system reaches a direct-current load, adjusting the temperature of the superheated steam by adopting a mode of adjusting the water supply quantity or spraying water for reducing the temperature.
Claims (5)
1. A direct-flow steam-water system for a waste heat boiler is characterized in that the direct-flow steam-water system of the waste heat boiler comprises a low-pressure steam drum, a high-pressure economizer, a high-pressure evaporator, a steam-water separator, a high-pressure superheater and a main steam pipeline, wherein a water outlet of the low-pressure steam drum is communicated with a water inlet of the high-pressure economizer through a pipeline, and a high-pressure water feed pump is arranged on the pipeline; the water outlet of the high-pressure economizer is communicated with the water inlet of the high-pressure evaporator through a pipeline, the water outlet of the high-pressure evaporator is communicated with the water inlet of the steam-water separator through a pipeline, the steam outlet of the steam-water separator is communicated with the steam inlet of the high-pressure superheater through a pipeline, and the steam outlet of the high-pressure superheater is communicated with the main steam pipeline through a pipeline; the water outlet of the steam-water separator is communicated with the water inlet of the drain valve through a pipeline, and the water outlet of the drain valve is communicated with the water inlet of the low-pressure steam drum through a pipeline.
2. The once-through steam-water system for a waste heat boiler according to claim 1, characterized in that the waste heat boiler is a dual-pressure waste heat boiler or a triple-pressure waste heat boiler.
3. The use method of the once-through steam-water system for the waste heat boiler according to claim 1 is characterized by comprising the following steps:
at the initial stage of starting the equipment, pumping working media in a low-pressure steam pocket into a high-pressure economizer through a high-pressure water supply pump, heating the working media by the high-pressure economizer, then feeding the working media into a high-pressure evaporator for continuous heating, feeding the working media heated by the high-pressure evaporator into a steam-water separator, separating the working media into saturated steam and saturated water by the steam-water separator, feeding the saturated steam into a high-pressure superheater for further heating to form superheated steam, and then feeding the superheated steam into a main steam pipeline; saturated water returns to the low-pressure steam drum through the drain valve under the action of the pressure difference between the steam-water separator and the low-pressure steam drum, and meanwhile, the water level of the low-pressure steam drum is kept balanced by adjusting the valve openness of the high-pressure water supply pump and the drain valve;
when the direct-current steam-water system reaches a direct-current load, all the outlets of the high-pressure evaporator are superheated steam, then the superheated steam enters the high-pressure superheater through the steam-water separator for further heating, and finally enters the main steam pipeline; at this time, the trap on the steam separator line is closed.
4. The use method of the once-through steam-water system for the waste heat boiler according to claim 3, characterized in that the working medium in the low-pressure steam drum is boiler water.
5. The use method of the once-through steam-water system for the waste heat boiler according to claim 3, characterized in that after the once-through steam-water system reaches a once-through load, the temperature of the superheated steam is adjusted by adjusting the feed water amount or by spraying water to reduce the temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011610959.9A CN112781025A (en) | 2020-12-29 | 2020-12-29 | Direct-flow steam-water system for waste heat boiler and use method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011610959.9A CN112781025A (en) | 2020-12-29 | 2020-12-29 | Direct-flow steam-water system for waste heat boiler and use method thereof |
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