CN209978085U - Novel steam flue gas preheater - Google Patents
Novel steam flue gas preheater Download PDFInfo
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- CN209978085U CN209978085U CN201920422879.7U CN201920422879U CN209978085U CN 209978085 U CN209978085 U CN 209978085U CN 201920422879 U CN201920422879 U CN 201920422879U CN 209978085 U CN209978085 U CN 209978085U
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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
The utility model relates to a novel steam flue gas preheater, which is a two-section steam flue gas preheater, wherein a high-pressure supercooling section heat exchanger and a high-pressure condensation section heat exchanger are arranged in sequence according to the flow direction of flue gas; 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 steam flue gas preheater consists of a steam extraction regulating valve, a buffer tank, a liquid level meter, a drainage regulating valve and a throttle orifice plate; the steam extraction regulating valve feeds back a temperature signal through an outlet air temperature measuring point to regulate the flow of steam entering the high-pressure condensing section heat exchanger, a steam-water mixture after heat exchange and condensation enters the buffer tank, water in the buffer tank enters the high-pressure supercooling section heat exchanger through a pipeline to be further cooled to 180-210 ℃ or 230-250 ℃, and the water enters the drain pipeline through the drain regulating valve. The utility model discloses a hydrophobic flow of buffer tank liquid level signal control ensures heat transfer capacity and steam extraction heat utilization rate to can long-term safety, steady operation.
Description
Technical Field
The utility model relates to an urban domestic waste burns the field, specifically is the drainage system of steam-gas heater SGH of heating waste incinerator low temperature SCR reactor flue gas.
Background
At present, a steam-flue gas heater (SGH) is adopted in front of an SCR reactor of a flue gas purification system of a waste incineration plant to heat flue gas so as to meet the flue gas temperature required by the SCR reactor. For improving steam extraction heat utilization rate, solving pipeline vibration and oxygen-eliminating device boiling scheduling problem, the utility model discloses a two segmentation steam flue gas preheaters. The two-section steam flue gas preheater is characterized in that a high-pressure supercooling section heat exchanger is additionally arranged at the front end of a high-pressure section heat exchanger, and saturated water from the high-pressure condensing section heat exchanger is further cooled to 180-210 ℃ or 230-250 ℃. The heat exchange capacity and the steam extraction heat utilization rate of the two-section steam flue gas preheater mostly depend on the reliability and 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. The problems of the drainage system can also cause the series of problems that the steam smoke preheater can not heat the smoke to the designed temperature, the steam extraction flow rate is higher than the designed value, and the deaerator boils.
The utility model relates to a two segmentation steam flue gas preheater 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 be safe, steady operation for a long time.
SUMMERY OF THE UTILITY MODEL
The utility model provides a two segmentation steam flue gas preheater drainage system solves the hydrophobicity problem, improves the ability of system steady operation.
The utility model discloses a concrete technical scheme is:
a novel steam flue gas preheater is a two-section steam flue gas preheater, and a high-pressure supercooling section heat exchanger (2) and a high-pressure condensing section heat exchanger (1) are sequentially arranged according to the flow direction of flue gas; the steam drum extracts steam, enters a high-pressure condensing section heat exchanger (1) for heat exchange, then enters a high-pressure supercooling section heat exchanger (2), and finally enters a drain pipeline; the steam flue gas preheater consists of a steam extraction regulating valve, a buffer tank, a liquid level meter, a drainage regulating valve and a throttle orifice plate;
the steam extraction regulating valve (3) feeds back a temperature signal through an outlet air temperature measuring point (8) to regulate the flow of steam entering the high-pressure condensing section heat exchanger (1), a steam-water mixture after heat exchange and condensation enters the buffer tank (4), water in the buffer tank (4) enters the high-pressure supercooling section heat exchanger (2) through a pipeline to be further cooled to 180-210 ℃ or 230-250 ℃, and the water enters a drainage pipeline through the drainage regulating valve (6).
Furthermore, the opening degree of the drain regulating valve (6) is regulated according to a feedback signal of the liquid level meter (5), 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. Through setting up buffer tank and allowing the liquid level variation range to avoid drainage control governing valve to frequently adjust the aperture. Because the load of the steam flue gas preheater is greatly changed in the front and the rear periods of operation and different seasons, the throttle valve group (7) is arranged at the rear end of the drain control valve so as to increase the flow regulating range of the drain control valve.
During operation, the steam flow entering the high-pressure condensation section heat exchanger is adjusted by the steam extraction adjusting valve according to the temperature of hot air at the outlet of the preheater, a steam-water mixture after heat exchange condensation enters the buffer tank, water in the buffer tank enters the high-pressure supercooling section heat exchanger through a pipeline and is further cooled to 180-210 ℃ or 230-250 ℃ and enters the drain pipeline through the drain adjusting valve, and the drain amount is adjusted by the drain adjusting valve according to the liquid level of the buffer tank. Because the load of the steam flue gas preheater changes greatly in the front and the rear periods of operation and 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.
The technical effects are as follows:
1. the drainage system can stably maintain the pressure in the heat exchanger tube, and ensure that the heating capacity of the preheater and the steam extraction heat utilization rate reach design values.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a flow diagram of a flue gas cleaning system (low temperature SCR system).
FIG. 2 is a steam flue gas preheater flow diagram.
FIG. 3 is a diagram of a steam flue gas preheater drainage system.
Fig. 4 is a flow diagram of a flue gas cleaning system (medium temperature SCR system).
In figure 2, 1 is a high-pressure condensation section heat exchanger, and 2 is a high-pressure supercooling section heat exchanger.
In the figure 3, 1 is a high-pressure condensation section heat exchanger, 2 is a high-pressure supercooling section heat exchanger, 3 is a steam extraction regulating valve, 4 is a buffer tank, 5 is a liquid level meter, 6 is a drainage regulating valve, 7 is a throttling orifice plate, and 8 is an outlet air temperature measuring point.
Detailed Description
Example 1
In the figure 1, the flue gas purification process is 'semidry method + dry method + bag type dust collector + SGH + SCR', the flue gas at the outlet of the bag type dust collector is heated to 180 ℃ by the SGH and then enters a low-temperature SCR system, and the flue gas after denitration is discharged by a draught fan.
In fig. 2, a two-section steam flue gas preheater is sequentially provided with a high-pressure supercooling section heat exchanger (2) and a high-pressure condensing section heat exchanger (1) according to the flow direction of flue gas. The extracted steam of the steam drum enters a high-pressure condensing section heat exchanger (1) for heat exchange, then enters a high-pressure supercooling section heat exchanger (2) and finally enters a drain pipeline.
In the figure 3, a steam extraction regulating valve (3) feeds back a temperature signal through an outlet air temperature measuring point (8) to regulate the flow of steam entering a high-pressure condensation section heat exchanger (1), a steam-water mixture after heat exchange and condensation enters a buffer tank (4), water in the buffer tank (4) enters a high-pressure supercooling section heat exchanger (2) through a pipeline to be further cooled to 180-210 ℃, and finally enters a drainage pipeline through a drainage regulating valve (6). The opening degree of the hydrophobic regulating valve (6) is regulated according to a feedback signal of the liquid level meter (5), 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. Because the load of the steam flue gas preheater is greatly changed in the front and the rear periods of operation and different seasons, the throttle valve group (7) is arranged at the rear end of the drain control valve so as to increase the flow regulating range of the drain control valve.
Example 2
In fig. 4, the flue gas purification process is "semidry method + dry method + bag filter + GGH + SGH + SCR", 150 ℃ flue gas at the outlet of the dust collector is heated to 200 ℃ after being subjected to GGH heat exchange, then heated to 230 ℃ by SGH and enters a medium-temperature SCR system, and the flue gas after denitration is discharged after being subjected to GGH heat exchange and temperature reduction.
In fig. 2, a two-section steam flue gas preheater is sequentially provided with a high-pressure supercooling section heat exchanger (2) and a high-pressure condensing section heat exchanger (1) according to the flow direction of flue gas. The extracted steam of the steam drum enters a high-pressure condensing section heat exchanger (1) for heat exchange, then enters a high-pressure supercooling section heat exchanger (2) and finally enters a drain pipeline.
In the figure 3, a steam extraction regulating valve (3) feeds back a temperature signal through an outlet air temperature measuring point (8) to regulate the flow of steam entering a high-pressure condensation section heat exchanger (1), a steam-water mixture after heat exchange and condensation enters a buffer tank (4), water in the buffer tank (4) enters a high-pressure supercooling section heat exchanger (2) through a pipeline to be further cooled to 230-250 ℃, and finally enters a drainage pipeline through a drainage regulating valve (6). The opening degree of the hydrophobic regulating valve (6) is regulated according to a feedback signal of the liquid level meter (5), 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. Because the load of the steam flue gas preheater is greatly changed in the front and the rear periods of operation and different seasons, the throttle valve group (7) 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 (4)
1. The utility model provides a novel steam flue gas preheater which characterized in that: the system is a two-section steam flue gas preheater, and a high-pressure supercooling section heat exchanger (2) and a high-pressure condensing section heat exchanger (1) are sequentially arranged according to the flow direction of flue gas; the steam drum extracts steam, enters a high-pressure condensing section heat exchanger (1) for heat exchange, then enters a high-pressure supercooling section heat exchanger (2), and finally enters a drain pipeline; the steam flue gas preheater consists of a steam extraction regulating valve, a buffer tank, a liquid level meter, a drainage regulating valve and a throttle orifice plate;
the steam extraction regulating valve (3) feeds back a temperature signal through an outlet air temperature measuring point (8) to regulate the flow of steam entering the high-pressure condensing section heat exchanger (1), a steam-water mixture after heat exchange and condensation enters the buffer tank (4), water in the buffer tank (4) enters the high-pressure supercooling section heat exchanger (2) through a pipeline to be further cooled to 180-210 ℃ or 230-250 ℃, and the water enters a drainage pipeline through the drainage regulating valve (6).
2. The novel steam flue gas preheater of claim 1, wherein: the drainage system adopts an adjusting valve and adjusts drainage flow according to the buffer tank liquid level signal.
3. The novel steam flue gas preheater of claim 1, wherein: the drainage system is provided with a buffer tank, so that only condensed water enters the high-pressure supercooling section heat exchanger, and the vibration of the heat exchanger is reduced.
4. The novel steam flue gas preheater of claim 1, wherein: and a throttle orifice is arranged at the downstream of the hydrophobic regulating valve to enlarge the flow regulating range of the hydrophobic regulating valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920422879.7U CN209978085U (en) | 2019-03-31 | 2019-03-31 | Novel steam flue gas preheater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920422879.7U CN209978085U (en) | 2019-03-31 | 2019-03-31 | Novel steam flue gas preheater |
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| CN209978085U true CN209978085U (en) | 2020-01-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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