CN209978086U - Three-section type steam air preheater drainage system - Google Patents
Three-section type steam air preheater drainage system Download PDFInfo
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- CN209978086U CN209978086U CN201920428821.3U CN201920428821U CN209978086U CN 209978086 U CN209978086 U CN 209978086U CN 201920428821 U CN201920428821 U CN 201920428821U CN 209978086 U CN209978086 U CN 209978086U
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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
Abstract
The utility model relates to an urban domestic waste burns the field, specifically is heating garbage incinerator combustion air's syllogic steam air heater drainage system. A high-pressure supercooling section heat exchanger, a low-pressure section heat exchanger and a high-pressure condensing section heat exchanger are sequentially arranged according to the air flow direction; the steam drum extracts steam and enters a high-pressure condensing section heat exchanger for heat exchange, then enters a high-pressure supercooling section heat exchanger, and finally enters a drain pipeline; the three-section steam air preheater drainage system consists of a steam extraction regulating valve, a buffer tank, a liquid level meter, a drainage regulating valve and a throttle orifice plate. The drain regulating valve adopts a buffer tank liquid level signal to regulate drain flow, ensures the heat exchange capacity and the steam extraction heat utilization rate, and can operate safely and stably for a long time.
Description
Technical Field
The utility model relates to an urban domestic waste burns the field, specifically is heating garbage incinerator combustion air's syllogic steam air heater drainage system.
Background
At present, primary air of a waste incineration plant is heated by a steam air preheater, and the three-section type steam air preheater is more and more applied for improving the utilization rate of steam extraction heat and solving the problems of pipeline vibration, deaerator boiling and the like. The three-section steam air preheater is characterized in that a high-pressure supercooling section heat exchanger is additionally arranged at the front end of a low-pressure section heat exchanger, and saturated water from the high-pressure condensing section heat exchanger is further cooled to 90-120 ℃. The heat exchange capacity and the steam extraction heat utilization rate of the three-section steam air preheater are mostly determined by the reliability and the rationality of a drainage system, and the conventional inverted bucket drain valve and the gas-liquid two-phase flow drain valve have the problems of drainage and steam entrainment in different degrees, incapability of stably maintaining the pressure in a heat exchanger tube, easiness in damage and the like. Problems with the steam trap system can also lead to a series of problems with the steam air preheater not being able to heat the air to the design temperature, the extraction flow being higher than the design value, and the deaerator boiling.
The utility model relates to a syllogic steam air heater drainage system, hydrophobic governing valve adopt buffer tank liquid level signal to adjust hydrophobic flow, ensure heat transfer capacity and steam extraction heat utilization rate to can long-term safety, steady operation.
SUMMERY OF THE UTILITY MODEL
The utility model provides a three-section steam air preheater drainage system, which is characterized in that a high-pressure supercooling section heat exchanger, a low-pressure section heat exchanger and a high-pressure condensation section heat exchanger are arranged in sequence according to the air flow direction; the steam drum extracts steam and enters a high-pressure condensing section heat exchanger for heat exchange, then enters a high-pressure supercooling section heat exchanger, and finally enters a drain pipeline;
the high-pressure steam extraction pipeline is provided with a regulating valve connected with an inlet header of the high-pressure condensation section heat exchanger, an outlet header of the high-pressure condensation section heat exchanger is connected with a buffer tank pipeline, the buffer tank is connected with an inlet header of the high-pressure supercooling section heat exchanger, and the outlet header of the high-pressure condensation section heat exchanger is sequentially connected with a drain regulating valve and a throttling orifice plate through pipelines;
the drain regulating valve regulates the opening according to a liquid level signal of a liquid level meter of the buffer tank;
the regulating valve arranged on the low-pressure steam extraction pipeline is connected with the inlet header of the low-pressure section heat exchanger through a pipeline, and the outlet header of the low-pressure section heat exchanger is connected with the drain pipeline.
Furthermore, the extracted steam of the steam turbine enters a drainage pipeline after being subjected to heat exchange by the low-pressure section heat exchanger.
During operation, the steam extraction regulating valve adjusts the steam flow entering the high-pressure condensation section heat exchanger according to the hot air temperature at the outlet of the preheater, the steam-water mixture after heat exchange condensation enters the buffer tank, the water in the buffer tank enters the high-pressure supercooling section heat exchanger through the pipeline to be further cooled to 90-120 ℃ and enters the drain pipeline through the drain regulating valve, and the drain regulating valve adjusts the drain volume according to the liquid level of the buffer tank. As the load of the steam air preheater is greatly changed in the front and the back of the operation and in different seasons, the throttling orifice plate is arranged at the rear end of the drain control valve so as to increase the flow regulating range of the drain control valve.
Drawings
The present invention will be further explained with reference to the drawings and examples.
FIG. 1 is a steam air preheater flow diagram.
FIG. 2 is a diagram of a steam air preheater drainage system.
In figure 1, 1 is a high-pressure condensation section heat exchanger, 2 is a low-pressure section heat exchanger, and 3 is a high-pressure supercooling section heat exchanger.
In the figure 2, 1 is a high-pressure condensation section heat exchanger, 2 is a low-pressure section heat exchanger, 3 is a high-pressure supercooling section heat exchanger, 4 is a steam extraction regulating valve, 5 is a buffer tank, 6 is a liquid level meter, 7 is a drainage regulating valve, 8 is a throttling orifice plate, 9 is an outlet air temperature measuring point, and 10 is a low-pressure section heat exchanger regulating valve.
Detailed Description
In fig. 1, a three-section steam air preheater is sequentially provided with a high-pressure supercooling section heat exchanger (3), a low-pressure section heat exchanger (2) and a high-pressure condensing section heat exchanger (1) according to the air flow direction. The extracted steam of the steam drum enters a high-pressure condensing section heat exchanger for heat exchange (1), then enters a high-pressure supercooling section heat exchanger (3) and finally enters a drain pipeline. The extracted steam of the steam turbine enters a drainage pipeline after being subjected to heat exchange by the low-pressure section heat exchanger.
In the figure 2, a regulating valve (4) is arranged on a high-pressure steam extraction pipeline and is connected with an inlet header of a high-pressure condensing section heat exchanger (1), an outlet header of the high-pressure steam extraction pipeline is connected with a buffer tank (5) through a pipeline, the buffer tank is connected with an inlet header of a high-pressure supercooling section heat exchanger (3), and the outlet header of the high-pressure steam extraction pipeline is sequentially connected with a drain regulating valve (7) and a throttling orifice plate (8) through a pipeline. The opening degree of the drainage regulating valve (7) is regulated according to a liquid level signal of a liquid level meter (6) of the buffer tank (5). The regulating valve (10) arranged on the low-pressure steam extraction pipeline is connected with the inlet header of the low-pressure section heat exchanger (2) through a pipeline, and the outlet header of the low-pressure steam extraction pipeline (2) is connected with a drain pipeline.
The steam extraction regulating valve (4) feeds back a temperature signal through an outlet air temperature measuring point (9) to regulate the steam flow entering the high-pressure condensing section heat exchanger (1), a steam-water mixture after heat exchange and condensation enters the buffer tank (5), water in the buffer tank (5) enters the high-pressure supercooling section heat exchanger (3) through a pipeline to be further cooled to 90-120 ℃, and finally enters a drain pipeline through the drain regulating valve (7). The opening degree of the hydrophobic regulating valve (7) is regulated according to a feedback signal of the liquid level meter (6), the opening degree of the regulating valve is reduced when the liquid level descends, and the opening degree of the regulating valve is increased when the liquid level ascends otherwise. The buffer tank and the allowable liquid level change range are arranged to avoid the opening degree of the drainage regulating valve from being frequently adjusted. As the load of the steam air preheater is greatly changed in the front and the rear periods of operation and different seasons, the throttle valve group is arranged at the rear end of the drain control valve so as to increase the flow regulating range of the drain control valve.
Claims (5)
1. A three-section steam air preheater drainage system is characterized in that a high-pressure supercooling section heat exchanger, a low-pressure section heat exchanger and a high-pressure condensing section heat exchanger are sequentially arranged according to the air flow direction; the steam drum extracts steam and enters a high-pressure condensing section heat exchanger for heat exchange, then enters a high-pressure supercooling section heat exchanger, and finally enters a drain pipeline;
the high-pressure steam extraction pipeline is provided with a regulating valve connected with an inlet header of the high-pressure condensation section heat exchanger, an outlet header of the high-pressure condensation section heat exchanger is connected with a buffer tank pipeline, the buffer tank is connected with an inlet header of the high-pressure supercooling section heat exchanger, and the outlet header of the high-pressure condensation section heat exchanger is sequentially connected with a drain regulating valve and a throttling orifice plate through pipelines;
the drain regulating valve regulates the opening according to a liquid level signal of a liquid level meter of the buffer tank;
the regulating valve arranged on the low-pressure steam extraction pipeline is connected with the inlet header of the low-pressure section heat exchanger through a pipeline, and the outlet header of the low-pressure section heat exchanger is connected with the drain pipeline.
2. The three-stage steam air preheater drainage system of claim 1, wherein: the extracted steam of the steam turbine enters a drainage pipeline after being subjected to heat exchange by the low-pressure section heat exchanger.
3. The three-stage steam air preheater drainage system of claim 1, wherein: the drainage system adopts an adjusting valve to adjust drainage flow according to the liquid level signal of the buffer tank.
4. The three-stage steam air preheater drainage system of claim 1, wherein: the drainage system is provided with a buffer tank, and only condensed water enters the high-pressure supercooling section heat exchanger to reduce the vibration of the heat exchanger.
5. The three-stage steam air preheater drainage system of claim 1, wherein: and a throttle orifice is arranged at the downstream of the drain regulating valve to enlarge the flow regulating range of the drain regulating valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920428821.3U CN209978086U (en) | 2019-03-30 | 2019-03-30 | Three-section type steam air preheater drainage system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920428821.3U CN209978086U (en) | 2019-03-30 | 2019-03-30 | Three-section type steam air preheater drainage system |
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| CN209978086U true CN209978086U (en) | 2020-01-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113446584A (en) * | 2021-06-24 | 2021-09-28 | 华能秦煤瑞金发电有限责任公司 | Power plant boiler water circulation system |
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2019
- 2019-03-30 CN CN201920428821.3U patent/CN209978086U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113446584A (en) * | 2021-06-24 | 2021-09-28 | 华能秦煤瑞金发电有限责任公司 | Power plant boiler water circulation system |
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