CN211739051U - Hot water recirculation system for flue gas waste heat recovery - Google Patents
Hot water recirculation system for flue gas waste heat recovery Download PDFInfo
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- CN211739051U CN211739051U CN201922138634.4U CN201922138634U CN211739051U CN 211739051 U CN211739051 U CN 211739051U CN 201922138634 U CN201922138634 U CN 201922138634U CN 211739051 U CN211739051 U CN 211739051U
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Abstract
The utility model provides a hot water recirculation system for flue gas waste heat recovery belongs to thermal power energy-saving technical field. The regulating valve is connected in parallel with the flue gas waste heat recovery heat exchanger; a gate valve and a booster water pump are additionally arranged, and a regulating valve ensures that the flow of condensed water entering the flue gas waste heat recovery heat exchanger is stable when the steam extraction condensing steam turbine works under the steam extraction working condition; the bypass valve is arranged at the booster water pump, the booster water pump is not put into operation when the steam turbine is in a pure condensation working condition, the bypass valve is opened, and the system forms open circulation by depending on the allowance of the condensate pump of the unit, so that the power consumption of the system can be reduced, and the power supply coal consumption is reduced; the air heater is additionally arranged behind the flue gas waste heat recovery heat exchanger, so that the flue gas waste heat recovery system can run in multiple modes, the load regulation range is large, and the unit adaptability is good. The utility model provides the high waste heat recovery rate of discharging fume, reduction equipment initial investment, adjust nimble, energy-conserving effect are showing, reduce the engineering and implement the degree of difficulty.
Description
Technical Field
The utility model relates to a hot water recirculation system for flue gas waste heat recovery belongs to thermal power energy-saving technical field.
Background
Coal price is a major factor affecting economic benefits of coal-fired power plants. The flue gas waste heat recovery system can recover the waste heat of the boiler exhaust gas so as to save the coal consumption of power generation, and is a standard device in newly built coal-fired generator sets in China at present, and old generator sets are gradually subjected to energy-saving modification and are additionally provided with the system. The flue gas waste heat recovery system generally utilizes boiler exhaust smoke to heat unit condensed water (as shown in figure 1), the condensed water from the 7 th or 8 th stage low-pressure heater 2 of a steam turbine is generally used as a heat transfer working medium, and a flue gas waste heat recovery heat exchanger 6 is connected between the 7 th or 8 th stage low-pressure heater 2 and the 6 th stage low-pressure heater 1 of the steam turbine. And the low-pressure cylinder of the steam turbine of the displacement part extracts steam, so that the coal consumption is saved. The system usually uses a condensate pump as the driving force of the working medium, and a driving water pump is not additionally arranged. However, for the steam extraction and condensation type steam turbine generator unit, if the steam extraction amount is large, the flow of the condensed water at the outlet of the 7 th-stage low-pressure heater 2 is far smaller than the pure condensation working condition, and if the condensed water is still used as the working medium, the exhaust waste heat can not be fully recovered. If two-stage circulation (as shown in figure 2) is adopted, the flow of the working medium entering the flue gas waste heat recovery heat exchanger 6 is unchanged, and the recovered heat is exchanged out through the water-water heat exchanger 9, the driving water pump 3 and the water-water heat exchanger 9 need to be added in the system, the flue gas waste heat recovery efficiency is reduced, and the initial investment of equipment and the engineering implementation difficulty are increased.
Disclosure of Invention
The utility model aims at improving the smoke exhaust waste heat recovery efficiency and reducing the technical problem of equipment initial investment and engineering implementation difficulty.
In order to solve the above problems, the technical solution adopted by the present invention is to provide a hot water recycling system for flue gas waste heat recovery, wherein a flue gas waste heat recovery heat exchanger is connected in parallel between a 7 th or 8 th stage low pressure heater and a 6 th stage low pressure heater of a steam turbine; the flue gas waste heat recovery heat exchanger is connected with an adjusting valve in parallel; a gate valve and two booster water pumps are arranged between the regulating valve and the flue gas waste heat recovery heat exchanger; and the gate valve and the two booster water pumps are connected in parallel and then connected in series with the flue gas waste heat recovery heat exchanger.
Preferably, a manual valve is arranged at the inlet or the outlet of the regulating valve in series.
Preferably, a check valve is arranged at the inlet or the outlet of the gate valve in series.
Preferably, the flue gas waste heat recovery heat exchanger is connected in parallel with a plurality of flue gas waste heat recovery heat exchangers, and the number of the flue gas waste heat recovery heat exchangers connected in parallel is at least one.
Preferably, the flue gas waste heat recovery heat exchangers are connected in series with a plurality of flue gas waste heat recovery heat exchangers in front and at the back, and the number of the flue gas waste heat recovery heat exchangers connected in series is at least one.
Preferably, an isolating valve is arranged at the inlet or the outlet of the flue gas waste heat recovery heat exchanger in series.
Preferably, a fan heater or a heating network heater is connected in series at the outlet of the flue gas waste heat recovery heat exchanger.
Compared with the prior art, the utility model discloses following beneficial effect has:
the hot water recirculation regulating valve is arranged between the outlet and the inlet of the flue gas waste heat recovery heat exchanger, so that the stable flow of condensed water entering the flue gas waste heat recovery heat exchanger is ensured when the steam extraction condensing steam turbine works under the steam extraction working condition; a booster water pump is added and a bypass valve is arranged. When the steam turbine is in a pure condensing working condition, the booster water pump is not put into operation, the bypass valve is opened, and the system forms open circulation by depending on the allowance of the condensate pump of the unit, so that the power consumption of the system can be reduced, and the power supply coal consumption is reduced; when the steam turbine works under the steam extraction working condition, the booster water pump is put into operation, and the bypass valve is closed.
A water-water heat exchanger is cancelled, so that the initial period of equipment and the engineering implementation difficulty are reduced; the booster pump is adjusted to be operated only under the steam extraction working condition from the continuous operation under the full working condition, thereby reducing the operation cost. In addition, after the air heater (or other heaters) is additionally arranged, the flue gas waste heat recovery system can realize pure open type operation, open-close type operation and pure close type operation, the load regulation range is large, and the unit adaptability is good.
Drawings
FIG. 1 is a schematic diagram of the components and operation of a flue gas waste heat recovery system in the prior art;
FIG. 2 is a schematic diagram of the prior art flue gas waste heat recovery system with two-stage cycle;
FIG. 3 is a schematic diagram of the components and operation of the flue gas waste heat recovery system with hot water recycling;
FIG. 4 is a schematic diagram showing the components and operation of the flue gas waste heat recovery system with the manual valve and the check valve;
FIG. 5 is a schematic diagram showing the composition and operation of the flue gas waste heat recovery system with two flue gas waste heat recovery heat exchangers connected in parallel;
fig. 6 is a schematic diagram of the components and operation of the flue gas waste heat recovery system with the air heater (or other heaters).
Detailed Description
In order to make the present invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings;
as shown in fig. 1-6, the utility model provides a hot water recirculation system for flue gas waste heat recovery, which is characterized in that a flue gas waste heat recovery heat exchanger 6 is connected in parallel between a 7 th or 8 th low pressure heater 2 and a 6 th low pressure heater 1 of a steam turbine; the flue gas waste heat recovery heat exchanger 6 is connected in parallel with an adjusting valve M1; a gate valve M2 and two booster water pumps 3 are arranged between the regulating valve M1 and the flue gas waste heat recovery heat exchanger 6; the gate valve M2 and the two booster pumps 3 are connected in parallel and then connected in series with the flue gas waste heat recovery heat exchanger 6. A manual valve 4 is arranged in series at the inlet or the outlet of the regulating valve M1. A check valve 5 is arranged in series at the inlet or outlet of the gate valve M2. The flue gas waste heat recovery heat exchanger 6 is connected in parallel with a plurality of flue gas waste heat recovery heat exchangers, or the flue gas waste heat recovery heat exchanger 6 is connected in series with a plurality of flue gas waste heat recovery heat exchangers in front and at the back. An isolating valve is arranged in series at the inlet or the outlet of the flue gas waste heat recovery heat exchanger 6; an air heater or a heating network heater 7 is arranged in series at the outlet of the flue gas waste heat recovery heat exchanger 6.
A regulating valve M1, a gate valve M2 and a booster water pump 3 are added in the conventional flue gas waste heat recovery system. When the steam turbine works in the pure condensing working condition, the regulating valve M1 is completely closed, the gate valve M2 is opened, the booster water pump 3 is not put into operation, and the system operation mode is the same as that of a conventional flue gas waste heat recovery system. When the steam turbine works in a steam extraction working condition, the regulating valve M1 is opened, the gate valve M2 is closed, the booster water pump 3 is put into operation, and at the moment, part of condensed water from the outlet of the flue gas waste heat recovery heat exchanger 6 is mixed with the condensed water from the No. 7 and No. 8 low-pressure heaters 2 and then enters the flue gas waste heat recovery heat exchanger 6; the regulating valve M1 is used to regulate the flow of hot water recirculation. The system can ensure the maximum recovery of the flue gas waste heat under various working conditions.
As shown in FIG. 4, the regulating valve M1 can be connected with a manual valve 4 in series at the inlet or the outlet thereof for convenient maintenance; the gate valve M2 may be connected in series with a check valve 5 at its inlet or outlet to prevent working fluid from returning from the outlet of the booster pump 3 to the pump inlet. As shown in fig. 5, a single flue gas waste heat recovery heat exchanger 6 may be provided, or a plurality of flue gas waste heat recovery heat exchangers may be connected in series or in parallel. Correspondingly, the inlet and the outlet of each heat exchanger can be provided with an isolation valve. As shown in fig. 6, the system can also be provided with a heater 7 behind the flue gas waste heat recovery heat exchanger to realize the pure closed operation of the system.
A hot water recirculation regulating valve is arranged between the outlet and the inlet of the flue gas waste heat recovery heat exchanger, so that the flow of condensed water entering the flue gas waste heat recovery heat exchanger is ensured to be stable when the steam extraction condensing steam turbine works under the steam extraction working condition;
a bypass valve M2 is provided at the booster water pump 3. When the steam turbine is in a pure condensing working condition, the booster water pump is not put into operation, the bypass valve M2 is opened, the system forms open circulation by depending on the allowance of the condensate pump of the unit, and the power consumption of the system can be reduced, so that the power supply coal consumption is reduced; when the steam turbine is in the steam extraction working condition, the booster water pump is put into operation, and the bypass valve M2 is closed.
After the air heater (or other heaters) is additionally arranged behind the flue gas waste heat recovery heat exchanger, the flue gas waste heat recovery system can realize pure open type operation, open-closed type operation and pure closed type operation, the load regulation range is wide, and the unit adaptability is good.
The foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the present invention in any way and in any way, and it should be understood that modifications and additions may be made by those skilled in the art without departing from the scope of the present invention. Those skilled in the art can make various changes, modifications and evolutions equivalent to those made by the above-disclosed technical content without departing from the spirit and scope of the present invention, and all such changes, modifications and evolutions are equivalent embodiments of the present invention; meanwhile, any changes, modifications and evolutions of equivalent changes to the above embodiments according to the actual technology of the present invention are also within the scope of the technical solution of the present invention.
Claims (7)
1. A hot water recycling system for flue gas waste heat recovery is characterized in that a flue gas waste heat recovery heat exchanger (6) is connected in parallel between a 7 th or 8 th stage low-pressure heater (2) and a 6 th stage low-pressure heater (1) of a steam turbine; the method is characterized in that: the flue gas waste heat recovery heat exchanger (6) is connected in parallel with a regulating valve (M1); a gate valve (M2) and two booster water pumps (3) are arranged between the regulating valve (M1) and the flue gas waste heat recovery heat exchanger (6); and the gate valve (M2) and the two booster water pumps (3) are connected in parallel and then are connected in series with the flue gas waste heat recovery heat exchanger (6).
2. The hot water recirculation system for flue gas waste heat recovery as claimed in claim 1, wherein: and a manual valve (4) is arranged in series at the inlet or the outlet of the regulating valve (M1).
3. The hot water recirculation system for flue gas waste heat recovery as claimed in claim 1, wherein: and a check valve (5) is arranged at the inlet or the outlet of the gate valve (M2) in series.
4. The hot water recirculation system for flue gas waste heat recovery as claimed in claim 1, wherein: the flue gas waste heat recovery heat exchanger (6) is connected in parallel with a plurality of flue gas waste heat recovery heat exchangers, and the number of the flue gas waste heat recovery heat exchangers connected in parallel is at least one.
5. The hot water recirculation system for flue gas waste heat recovery as claimed in claim 1, wherein: the flue gas waste heat recovery heat exchangers (6) are connected in series in the front and at the back, and the number of the flue gas waste heat recovery heat exchangers connected in series is at least one.
6. The hot water recirculation system for flue gas waste heat recovery as claimed in claim 1, wherein: and an isolating valve is arranged at the inlet or the outlet of the flue gas waste heat recovery heat exchanger (6) in series.
7. The hot water recirculation system for flue gas waste heat recovery as claimed in claim 1, wherein: and a heater (7) of a fan heater or a heating network is connected in series at the outlet of the flue gas waste heat recovery heat exchanger (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922138634.4U CN211739051U (en) | 2019-12-03 | 2019-12-03 | Hot water recirculation system for flue gas waste heat recovery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922138634.4U CN211739051U (en) | 2019-12-03 | 2019-12-03 | Hot water recirculation system for flue gas waste heat recovery |
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| CN211739051U true CN211739051U (en) | 2020-10-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110864274A (en) * | 2019-12-03 | 2020-03-06 | 石家庄良村热电有限公司 | Hot water recirculation system for flue gas waste heat recovery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110864274A (en) * | 2019-12-03 | 2020-03-06 | 石家庄良村热电有限公司 | Hot water recirculation system for flue gas waste heat recovery |
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