CN218936326U - System for adjusting inlet water temperature of low-temperature economizer - Google Patents
System for adjusting inlet water temperature of low-temperature economizer Download PDFInfo
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- CN218936326U CN218936326U CN202222957545.4U CN202222957545U CN218936326U CN 218936326 U CN218936326 U CN 218936326U CN 202222957545 U CN202222957545 U CN 202222957545U CN 218936326 U CN218936326 U CN 218936326U
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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 discloses a system for adjusting the water temperature at the inlet of a low-temperature economizer, which belongs to the technical field of flue gas waste heat recovery and comprises the low-temperature economizer, a heater and a steam heater, wherein a water outlet of the low-temperature economizer is connected with a circulating water side inlet of the steam heater, one way of a circulating water side outlet of the steam heater is connected with a water inlet of the heater, the other way of the circulating water side outlet of the steam heater is connected with a water outlet of the heater, and an electric regulating valve is arranged on the other way of the circulating water side outlet of the steam heater; the water outlet of the air heater is communicated with the water inlet of the low-temperature economizer through a circulating water pump. The utility model can realize the on-line adjustment of the inlet water temperature of the economizer, ensures the lowest temperature and the water inlet temperature of the low-temperature economizer under any working condition, prevents the low-temperature economizer from dewing, corroding, depositing and blocking caused by the fact that the wall surface temperature of the low-temperature economizer is lower than the dew point of water, breaks through the problem of easy blocking of the low-temperature economizer in the low-temperature environment, and improves the reliability of the low-temperature economizer.
Description
Technical Field
The utility model belongs to the technical field of flue gas waste heat recovery, and particularly relates to a system for adjusting the inlet water temperature of a low-temperature economizer.
Background
With the continuous promotion of low carbon environmental protection policy, the thermal power generating unit has accomplished ultra-low emission and has reformed, along with the NOx index improves, and denitration system spouts ammonia volume increase, and unit ammonia escape volume increases, and the ammonium bisulfate deposit ash blocking phenomenon often appears in air preheater, along with low-temperature economizer popularization, the unit improves air preheater entry wind temperature through low-temperature economizer combination heater system, improves air preheater cold leg wall temperature, solves the ammonium bisulfate ash blocking and the corruption problem of air preheater.
Because the environmental temperature is lower in winter, the water outlet temperature of the warm air blower is lower, namely the water inlet temperature of the low-temperature economizer is low, and even is lower than the dew point temperature of the flue gas. The operation duration is prolonged, the low-temperature corrosion, ash accumulation blocking and leakage phenomena occur in the low-temperature economizer, the operation is seriously and even stopped, the water outlet temperature and the outlet air temperature of the air heater are further reduced, the air heater is one of the effective measures for relieving the ash blocking of the air preheater at present, the outlet air temperature of the air heater is reduced to directly reduce the wall temperature of the cold end of the air preheater, the ash blocking of the air preheater is serious, the water inlet temperature of the low-temperature economizer is reduced to directly cause the ash blocking of the low-temperature economizer to be serious, and the safe operation of a unit is greatly influenced.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art, and provides a system for adjusting the inlet water temperature of a low-temperature economizer, which is reasonable in structural design, and solves the problem that the inlet water temperature of the low-temperature economizer is too low in the prior art.
The utility model solves the problems by adopting the following technical scheme: the system for adjusting the water temperature at the inlet of the low-temperature economizer is characterized by comprising the low-temperature economizer, a warm air heater and a steam heater, wherein a water outlet of the low-temperature economizer is connected with a circulating water side inlet of the steam heater, one path of a circulating water side outlet of the steam heater is connected with a water inlet of the warm air heater, the other path of a circulating water side outlet of the steam heater is connected with a water outlet of the warm air heater, and an electric adjusting valve is arranged on the other path of the circulating water side outlet of the steam heater; and the water outlet of the heater is communicated with the water inlet of the low-temperature economizer through a circulating water pump.
Furthermore, the circulating water side outlet of the steam heater, the water outlet of the heater and the water inlet of the low-temperature economizer are all provided with temperature detection devices.
Further, the air preheater is further arranged, an outlet of the air preheater is communicated with a flue gas inlet of the low-temperature economizer, and an inlet of the air preheater is communicated with an air outlet of the air heater.
Further, the low-temperature coal economizer also comprises an electric dust collector, and a flue gas outlet of the low-temperature coal economizer is communicated with a flue gas inlet of the electric dust collector.
Further, the flue gas desulfurization device further comprises a desulfurization tower, wherein a flue gas outlet of the electric dust remover is communicated with a flue gas inlet of the desulfurization tower through a draught fan, and a flue gas outlet of the desulfurization tower is communicated with a flue gas inlet of a chimney.
Compared with the prior art, the utility model has the following advantages and effects: the utility model can realize the on-line adjustment of the inlet water temperature of the economizer. When the inlet water temperature of the low-temperature economizer meets the design requirement, the water inlet of the low-temperature economizer is completely from the water outlet of the air heater; when the water inlet temperature of the low-temperature economizer with lower ambient temperature cannot meet the design requirement, the steam heater is used for heating the heat medium water to meet the water inlet temperature requirement of the low-temperature economizer, and the water inlet of the low-temperature economizer is completely from the water outlet of the heater; when the environmental temperature is further reduced and the water inlet temperature requirement of the low-temperature economizer cannot be met due to the fact that the steam heater is fully opened, a bypass valve of the heater is opened, so that part of heating medium water is not cooled by the heater and is mixed with the heating medium water cooled by the heater, the water inlet temperature design requirement of the low-temperature economizer is met, and the water inlet of the low-temperature economizer is from the water outlet of the heater and the bypass water outlet. The lowest temperature and the water inlet temperature of the low-temperature economizer are guaranteed under any working condition, the low-temperature economizer is prevented from being dewed, corroded, deposited and blocked due to the fact that the wall surface temperature of the low-temperature economizer is lower than the dew point of water, the low-temperature economizer breaks through the problem that the low-temperature economizer is easy to block in a low-temperature environment, and the reliability of the low-temperature economizer is improved.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the system of the present utility model.
In the figure: an air preheater 1, a low-temperature economizer 2, an electric dust collector 3, an induced draft fan 4, a desulfurizing tower 5, a chimney 6, a heater 7, a steam heater 8, an electric regulating valve 9, a circulating water pump 10 and a temperature detection device 11.
Detailed Description
The present utility model will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present utility model and not limited to the following examples.
Examples
Referring to fig. 1, in this embodiment, a system for adjusting the water temperature at the inlet of a low-temperature economizer includes an air preheater 1, a low-temperature economizer 2, an electric precipitator 3, an induced draft fan 4, a desulfurizing tower 5, a heater 7, a steam heater 8 and a circulating water pump 10, wherein a water outlet of the low-temperature economizer 2 is connected with a circulating water side inlet of the steam heater 8, one path of a circulating water side outlet of the steam heater 8 is connected with a water inlet of the heater 7, the other path of a circulating water side outlet of the steam heater 8 is connected with a water outlet of the heater 7, and an electric adjusting valve 9 is installed on the other path of the circulating water side outlet of the steam heater 8; the water outlet of the warm air device 7 is communicated with the water inlet of the low-temperature economizer 2 through a circulating water pump 10; the circulating water side outlet of the steam heater 8, the water outlet of the warm air device 7 and the water inlet of the low-temperature economizer 2 are all provided with temperature detection devices 11; the outlet of the air preheater 1 is communicated with the flue gas inlet of the low-temperature economizer 2, and the inlet of the air preheater 1 is communicated with the air outlet of the air heater 7; the flue gas outlet of the low-temperature economizer 2 is communicated with the flue gas inlet of the electric dust collector 3, the flue gas outlet of the electric dust collector 3 is communicated with the flue gas inlet of the desulfurizing tower 5 through the induced draft fan 4, and the flue gas outlet of the desulfurizing tower 5 is communicated with the flue gas inlet of the chimney 6.
Working principle: the water inlet of the low-temperature economizer 2 is provided with a temperature detection device 11, when the inlet water temperature is higher, the heating medium water passes through the low-temperature economizer 2, enters the unheated steam heater 8 and is used for heating the heater 7, and finally returns to the low-temperature economizer 2; when the inlet water temperature is lower, the electric regulating valve 9 is opened, hot coal water enters the steam heater 8 to be heated after passing through the low-temperature economizer 2, hot coal water at the water outlet of the steam heater 8 is split, one part of the hot coal water is used for heating the air heater 7, and the other part of the hot coal water directly returns to the water inlet of the low-temperature economizer 2, so that the water temperature of the water inlet of the low-temperature economizer 2 is not lower than a required value under any working condition, and the problems of low-temperature corrosion and the like of the low-temperature economizer 2 are prevented. By adopting the system provided by the utility model, the inlet water temperature of the low-temperature economizer 2 can be regulated in all working conditions, so that the condition that the low-temperature economizer 2 is corroded at low temperature to cause leakage due to insufficient inlet water temperature of the low-temperature economizer 2 is avoided, and the safe and efficient operation of a unit is ensured.
What is not described in detail in this specification is all that is known to those skilled in the art.
Furthermore, the foregoing description of the utility model is provided by way of example only. All equivalent changes in construction, features and principles of the utility model according to the inventive concept are intended to be encompassed by the scope of the utility model. Those skilled in the art may make various modifications, additions and substitutions to the described embodiments without departing from the scope of the utility model as defined in the accompanying claims.
Claims (5)
1. The system for adjusting the water temperature at the inlet of the low-temperature economizer is characterized by comprising the low-temperature economizer (2), a warm air heater (7) and a steam heater (8), wherein a water outlet of the low-temperature economizer (2) is connected with a circulating water side inlet of the steam heater (8), one path of a circulating water side outlet of the steam heater (8) is connected with a water inlet of the warm air heater (7), the other path of a circulating water side outlet of the steam heater (8) is connected with a water outlet of the warm air heater (7), and an electric regulating valve (9) is arranged on the other path of the circulating water side outlet of the steam heater (8); the water outlet of the warm air device (7) is communicated with the water inlet of the low-temperature economizer (2) through a circulating water pump (10).
2. The system for adjusting the inlet water temperature of the low-temperature economizer according to claim 1, wherein a circulating water side outlet of the steam heater (8), a water outlet of the heater (7) and a water inlet of the low-temperature economizer (2) are all provided with temperature detection devices (11).
3. The system for adjusting the inlet water temperature of the low-temperature economizer according to claim 1, further comprising an air preheater (1), wherein an outlet of the air preheater (1) is communicated with a flue gas inlet of the low-temperature economizer (2), and an inlet of the air preheater (1) is communicated with an air outlet of a warm air blower (7).
4. A system for regulating the inlet water temperature of a low-temperature economizer according to claim 1 or 3, characterized by further comprising an electric precipitator (3), wherein the flue gas outlet of the low-temperature economizer (2) is in communication with the flue gas inlet of the electric precipitator (3).
5. The system for adjusting the inlet water temperature of the low-temperature economizer according to claim 4, further comprising a desulfurizing tower (5), wherein a flue gas outlet of the electric dust collector (3) is communicated with a flue gas inlet of the desulfurizing tower (5) through a draught fan (4), and a flue gas outlet of the desulfurizing tower (5) is communicated with a flue gas inlet of a chimney (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222957545.4U CN218936326U (en) | 2022-11-07 | 2022-11-07 | System for adjusting inlet water temperature of low-temperature economizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222957545.4U CN218936326U (en) | 2022-11-07 | 2022-11-07 | System for adjusting inlet water temperature of low-temperature economizer |
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| Publication Number | Publication Date |
|---|---|
| CN218936326U true CN218936326U (en) | 2023-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222957545.4U Active CN218936326U (en) | 2022-11-07 | 2022-11-07 | System for adjusting inlet water temperature of low-temperature economizer |
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| CN (1) | CN218936326U (en) |
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2022
- 2022-11-07 CN CN202222957545.4U patent/CN218936326U/en active Active
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