CN219243568U - Thermal energy recovery system of thermal power plant - Google Patents
Thermal energy recovery system of thermal power plant Download PDFInfo
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- CN219243568U CN219243568U CN202320499936.8U CN202320499936U CN219243568U CN 219243568 U CN219243568 U CN 219243568U CN 202320499936 U CN202320499936 U CN 202320499936U CN 219243568 U CN219243568 U CN 219243568U
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Abstract
The utility model belongs to the technical field of energy recovery, and particularly relates to a thermal power plant heat energy recovery system which comprises a deaerator, a fixed continuous expansion vessel, a steam trap, a waste steam recovery device and a sewage heat energy recovery device, wherein the waste steam recovery device is respectively communicated with a steam side pipeline of the deaerator, a steam side pipeline of the fixed continuous expansion vessel and a steam side pipeline of the steam trap; the sewage heat energy recovery device is communicated with a sewage drain pipeline of the fixed-connection row expansion vessel. The utility model is provided with the exhaust steam recovery device, the condensate water of the original unit in the factory is used as working water, the exhaust steam of each deaerator, the fixed exhaust steam and the exhaust steam of the drain tank are recovered, and meanwhile, the exhaust steam recovery device has the function of recovering the heat energy of sewage discharged by the fixed-discharge expansion vessel; the operation of heating and boosting the reclaimed water by a low-pressure heater is not needed, and the dissolved amount of oxygen in the reclaimed water entering the deaerator is reduced.
Description
Technical Field
The utility model belongs to the technical field of energy recovery, and particularly relates to a thermal energy recovery system of a thermal power plant.
Background
The existing 2 circulating fluidized bed boilers of the thermal power plant are matched with 1 continuous-row expansion vessel, 1 fixed-row expansion vessel, 1 hydrophobic tank and 2 high-pressure rotary film deaerators, oxygen separated out from deaerated water during the operation of the existing system is discharged into the atmosphere through an oxygen discharge pipe at the top of the deaerator tower head, a large amount of steam is discharged while the oxygen is discharged, and the steam discharge temperature is about 150 ℃; the continuous row of expansion vessels, the fixed row of expansion vessels and the drain box directly discharge exhaust steam, and the steam discharge temperature is about 100 ℃. Therefore, the current system discharge has serious heat and working medium waste, and forms potential safety hazard for peripheral equipment; in addition, the existing sewage disposal system directly drains sewage into a trench, and the constant sewage drainage also causes the heat energy loss of the system.
At present, a recovery system is also used for recovering deaerator steam, the recovered deaerator steam is condensed into water through a condenser after the steam turbine does work, and the water is conveyed back to the deaerator by a pump body to be used as deaerator water supplement together with water of a low-level water tank (about 30 ℃), but the low-level water cannot be directly conveyed back to the deaerator in the process, because the low-level water temperature is lower, the dissolved oxygen of the deaerator is increased, and meanwhile, the deaerator and a conveying pipeline vibrate greatly, a low-pressure heater is also needed for heating and boosting the low-level water, and the whole system is complex in pipeline layout and low in heat recovery efficiency.
Disclosure of Invention
The utility model aims to provide a thermal power plant heat energy recovery system so as to solve the problems that the conventional recovery system provided in the background art is complex in pipeline layout and low in heat energy recovery efficiency.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
the heat energy recovery system of the thermal power plant comprises a deaerator, a fixed-connection-row expansion vessel, a steam trap, a waste steam recovery device and a sewage heat energy recovery device, wherein the waste steam recovery device is respectively communicated with a steam side pipeline of the deaerator, a steam side pipeline of the fixed-connection-row expansion vessel and a steam side pipeline of the steam trap, the waste steam recovery device is provided with a water return pipeline, and the waste steam recovery device is communicated with the water side pipeline of the deaerator through the water return pipeline; the sewage heat energy recovery device is communicated with a sewage discharge pipeline of the fixed-connection row expansion vessel.
Further, the exhaust steam recovery device comprises an exhaust steam heat exchange device and an exhaust steam recovery water tank, the exhaust steam heat exchange device comprises a steam inlet pipeline, a water inlet pipeline and a water outlet pipeline, the steam inlet pipeline of the exhaust steam recovery device is respectively communicated with the steam side pipeline of the deaerator, the steam side pipeline of the fixed-row expansion vessel and the steam side pipeline of the steam trap, the water inlet pipeline of the exhaust steam recovery device is communicated with a cooling water pipeline, and the water outlet pipeline of the exhaust steam recovery device is communicated with the exhaust steam recovery water tank; the top of exhaust steam recovery water tank sets up evacuating device, exhaust steam recovery water tank's bottom sets up the return water pipeline, return water pipeline and deaerator's water side pipeline intercommunication.
Further, the exhaust steam heat exchange device is a hybrid heat exchanger.
Further, the cooling water pipeline is communicated with the condensate water pipeline of the factory original unit.
Further, the water return pipeline comprises a first water return pipeline and a second water return pipeline which are arranged in parallel, a common pump is arranged on the first water return pipeline, a standby pump is arranged on the second water return pipeline, and the first water return pipeline and the second water return pipeline are communicated with a water side pipeline of the deaerator.
Further, the common pump and the standby pump are variable-frequency hot water pumps, the heat energy recovery system of the thermal power plant is provided with a controller, a liquid level sensor is arranged in the exhaust steam recovery water tank and is electrically connected with the controller, and a frequency converter of the common pump and a frequency converter of the standby pump are electrically connected with the controller.
Further, the sewage heat energy recovery device is a dividing wall type heat exchanger, a cooling tank is arranged below the sewage heat energy recovery device, one end of a shell side of the dividing wall type heat exchanger is connected with a sewage discharge pipeline of the fixed continuous row expansion vessel, and the other end of the shell side of the dividing wall type heat exchanger is communicated with the cooling tank; one end of the tube side of the dividing wall type heat exchanger is communicated with the low-level water tank, the other end of the tube side of the dividing wall type heat exchanger is communicated with the exhaust steam recovery water tank, and a low-level water pump is arranged between the low-level water tank and the dividing wall type heat exchanger.
Further, a temperature sensor is arranged at the water outlet of the exhaust steam recovery device, and the temperature sensor is electrically connected with the controller; the cooling water pipeline is provided with a flow valve, and the flow valve is electrically connected with the controller.
Compared with the prior art, the utility model has the beneficial effects that:
1. the system is provided with the exhaust steam recovery device, the exhaust steam recovery device utilizes condensate water of the original unit in the factory as working water to recover exhaust steam of the deaerator, fixed exhaust steam and exhaust steam of the drain tank, and meanwhile, the exhaust steam recovery device has the function of recovering heat energy of sewage discharged by the fixed-discharge expansion vessel; three paths of backwaters are arranged in the backwater pipeline and are respectively used as condensate water of a steam unit recovered by exhaust steam of the deaerator, condensate water of the steam unit recovered by exhaust steam of the fixed-exhaust and drain tanks, and the three paths of backwaters are returned to the deaerator to be used as deaerator water supplement.
2. The water in the low-level water tank of the system is subjected to heat exchange by utilizing the sewage of the quantitative drainage and expansion container, and then returned to the deaerator to be used as deaerator water supplementing in the waste steam recovery tank, so that the operation that the condensed water of the unit and the low-level water temperature are too low and the temperature and the pressure are raised by utilizing the low-pressure heater is avoided, the utilization rate of the heat energy of the system is improved, and the heat energy loss is reduced.
3. The waste steam heat exchange device recovers the waste steam water and the heat energy recovered by the waste water heat energy of the constant-row expansion device heats the water in the low-temperature water tank to be used as the water supplement of the deaerator, so that the oxygen dissolution amount in the working water of the deaerator is reduced, and the consumption of desalted water of the system is reduced.
Drawings
FIG. 1 is a schematic diagram of a thermal energy recovery system of the present thermal power plant;
in the figure: 1. a deaerator; 2. the first exhaust steam heat exchange device; 3. a fixed-line expansion vessel; 4. the second exhaust steam heat exchange device; 5. a plate heat exchanger; 6. a waste steam recovery water tank; 7. a low level water tank; 8. a low-level water pump; 9. a gas-liquid separator; 10. a common pump; 11. a backup pump; 12. and a DCS controller.
Detailed Description
The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.
Referring to fig. 1, an embodiment of the present utility model is provided:
the heat energy recovery system of the thermal power plant comprises a deaerator 1, a fixed row expansion vessel 3 and a steam trap, wherein as shown in figure 1, the thermal power plant is provided with two 2X 480t/h circulating fluidized bed boilers, namely, 1 continuous row expansion vessel, 1 fixed row expansion vessel and 1 steam trap of the 2X 520t/h high-pressure rotary film deaerator; and arranging a fixed-row expansion vessel 3 to discharge the dead steam of the fixed-row expansion vessel, the continuous-row expansion vessel and the steam trap.
The system is provided with a waste steam recovery device and a waste water heat recovery device, the waste steam recovery device comprises a waste steam heat exchange device and a waste steam recovery water tank 6, the waste steam heat exchange devices are a first waste steam heat exchange device 2 and a second waste steam heat exchange device 4 respectively, the first waste steam heat exchange device 2 is used as a deaerator waste steam recovery device, and the second waste steam heat exchange device 4 is used for waste steam heat exchange of a fixed and continuous expansion container and a steam trap and is used as a fixed waste steam recovery device; the first exhaust steam heat exchange device 2 and the second exhaust steam heat exchange device 4 are both hybrid heat exchangers, the hybrid heat exchangers conduct heat transfer by means of direct contact of cold fluid and hot fluid, and are preferably steam-jet type or liquid-jet type steam-water hybrid heat exchangers, the heat exchange efficiency is high, all steam is condensed into liquid water, and the QSH-12 type pipeline steam-water mixer sold by Hunan Zhi Fei Fu Tong device Co.
The first exhaust steam heat exchange device 2 is provided with a steam inlet pipeline, a water inlet pipeline and a water outlet pipeline, the steam inlet pipeline of the first exhaust steam heat exchange device 2 is respectively connected with the steam side pipelines of two deaerators, namely, the two deaerators share one mixed heat exchanger, the mixed heat exchanger is arranged in a boiler, the water outlet pipeline of the first exhaust steam heat exchange device 2 is communicated with the exhaust steam recovery water tank 6, the water inlet pipeline of the first exhaust steam heat exchange device 2 is connected with the condensate water pipeline of the original plant unit, the water inlet pipeline of the first exhaust steam heat exchange device 2 is connected with the water inlet pipeline of the slag cooling machine, the water supplementing of the existing slag cooling machine is intercepted to serve as working water for recovering exhaust steam, heat exchange is carried out on the steam in the first exhaust steam heat exchange device 2, condensate water of the original plant unit can be effectively heated, and the condensate water is returned to the deaerator for reuse.
The second exhaust steam heat exchange device 4 has the same structure as the first exhaust steam heat exchange device 2, and is provided with a steam inlet pipeline, a water inlet pipeline and a water outlet pipeline, wherein the steam inlet pipeline is communicated with the fixed and continuous exhaust expansion containers and the exhaust steam discharge parallel pipes of the steam trap, exhaust steam is led out at a proper position after the exhaust parallel pipes are positioned, and the sewage heat energy recovery device is arranged at the position of the boiler near the fixed exhaust expansion containers.
The water inlet pipeline of the second exhaust steam heat exchange device 4 is also connected with the water inlet pipeline of the slag cooler, water supplementing of the existing slag cooler is intercepted to serve as working water for recovering exhaust steam, condensed water of the original unit in the factory is used for fully exchanging heat with steam flashed out of the fixed continuous discharge expansion vessel and the steam trap, and the water outlet pipeline of the second exhaust steam heat exchange device 4 is communicated with the exhaust steam recovery water tank 6.
The top of exhaust steam recovery water tank 6 sets up the water inlet, the water inlet department of exhaust steam recovery water tank 6 sets up the inlet channel, the inlet channel communicates with the outlet conduit of first exhaust steam heat transfer device 2 and the outlet conduit of second exhaust steam heat transfer device 4 respectively, set up gas-liquid separator 9 on the inlet channel, gas-liquid separator 9 separates the liquid water after the heat transfer with noncondensable gas, and discharge noncondensable gas, liquid water gets into exhaust steam recovery water tank 6, exhaust steam recovery water tank 6's top sets up the evacuation pipe, set up the air release valve on the evacuation pipe, set up the heat preservation anticorrosive coating in the exhaust steam recovery water tank 6, exhaust steam recovery water tank 6's bottom sets up the return water pipeline, the return water pipeline communicates with the water side pipeline of oxygen-eliminating device, exhaust steam recovery water tank 6's effect is with first exhaust steam heat transfer device 2 and decide the water recovery after the heat transfer of connecting row and steam trap exhaust steam heat transfer device, and return the water that gathers the oxygen-eliminating device and utilize again.
The source of the working water in the waste steam recovery water tank 6 of the system is divided into three paths which are respectively used as the working water recovered by the waste steam of the deaerator, the working water recovered by the waste steam of the fixed continuous discharge and the drain tank, the waste steam recovery water tank 6 fully exchanges heat and condenses the steam discharged by the two deaerators, the fixed continuous discharge expansion vessel 3 and the steam steamed by the steam trap through the waste steam heat exchange device, and the condensed water of the heated unit is communicated and returned to the deaerator for reuse, thereby not only realizing the utilization of water resources and heat energy in the steam, but also reducing the oxygen dissolution amount in the water used by the deaerator and improving the working efficiency of the deaerator.
Further optimizing, the exhaust steam recovery water tank 6 is provided with a first water return pipeline and a second water return pipeline which are parallel, the first water return pipeline is provided with a common pump 10, the second water return pipeline is provided with a standby pump 11, and the first water return pipeline and the second water return pipeline are communicated with a water side pipeline of the deaerator.
The common pump and the standby pump are variable-frequency hot water pumps, a DCS controller 12 is arranged in the heat energy recovery system of the thermal power plant, a liquid level sensor is arranged in the exhaust steam recovery water tank 6, the liquid level sensor is preferably a UHF-D magnetic liquid level transmitter, the liquid level sensor collects liquid level signals in the exhaust steam recovery water tank 6, and the DCS controller 12 receives the liquid level signals and controls the start, stop and power of the common pump 10 and the standby pump 11 according to the liquid level signals in the exhaust steam recovery water tank 6.
The principle of the DCS controller 12 for controlling the start and stop and the power of the common pump and the standby pump through the level of the liquid level in the exhaust steam recovery water tank 6 is as follows: when the liquid level in the exhaust steam recovery water tank 6 is in the set liquid level height range, the common pump works normally, the standby pump is protected in an interlocking way, when the liquid level in the exhaust steam recovery water tank 6 is too high, the standby pump is started, the common pump and the standby pump work simultaneously, when the liquid level in the exhaust steam recovery water tank 6 drops to the normal water level, the standby pump is closed, and only the common pump works normally; when two pumps are started simultaneously, the frequency of the two pumps is required to be adjusted to be consistent manually, so that the phenomenon that one pump is not smooth in water outlet due to inconsistent pressure at the outlet of the pumps to cause vibration is avoided.
The sewage of the fixed continuous-row flash tank 3 is sewage of a boiler after being flashed in the fixed row, such as periodic sewage discharge, continuous-row water discharge, water leakage in each drain valve and the like, the sewage heat energy recovery device is a dividing wall type heat exchanger, in particular a plate type heat exchanger 5, one end of a shell pass of the plate type heat exchanger 5 is connected with a sewage discharge pipeline of the fixed continuous-row flash tank 3, and the other end of the shell pass of the plate type heat exchanger 5 is communicated with a cooling tank; one end of the tube side of the plate heat exchanger 5 is communicated with a low-level water tank 7, the other end of the tube side of the plate heat exchanger 5 is communicated with a waste steam recovery water tank 6, and a low-level water pump 8 is arranged between the low-level water tank 7 and the plate heat exchanger 5; the water from the low-level water tank 7 and the sewage from the fixed-connection expansion vessel 3 enter the exhaust steam recovery water tank 6 after heat exchange by the plate heat exchanger 5, and the sewage from the fixed-connection expansion vessel 3 after heat recovery by the heat energy recovery device is connected into a cooling pond.
Meanwhile, an integrated thermal resistance thermometer is arranged on a water outlet pipeline of the first exhaust steam heat exchange device and used as a temperature sensor, an integrated thermal resistance thermometer is arranged on a water outlet pipeline of the fixed-connection exhaust steam heat exchange device and used as a temperature sensor, flow valves are arranged on cooling water pipelines of the first exhaust steam heat exchange device and the fixed-connection exhaust steam heat exchange device, the temperature sensor detects the water outlet temperature of each exhaust steam heat exchange device and sends a temperature signal to a remote DCS controller 12, and the DCS controller 12 adjusts the flow of cooling water according to the water outlet temperature of each exhaust steam recovery device.
An electric butterfly valve is arranged at the external emptying position of the fixed steam exhaust side of the system; the steam side of the fixed exhaust steam recovery device is provided with a manual butterfly valve; the deaerator is emptied and provided with a stop valve; the deaerator is externally emptied and provided with a stop valve; a temperature control valve is arranged on the water inlet side of the fixed exhaust steam recovery device; a temperature control valve is arranged on the water inlet side of the deaerator exhaust steam recovery device; the slag cooler is provided with a stop valve; the fixed-row drainage inlet heat exchanger is provided with a stop valve.
Emergency operation when liquid level and temperature rise sharply or exhaust amount increases due to reasons other than the system:
(1) Opening an external emptying electric butterfly valve at the fixed exhaust side;
(2) Closing a manual butterfly valve at the steam side of the fixed exhaust steam recovery device;
(3) Opening the deaerator to empty the manual shutoff stop valve;
(4) Closing a manual stop valve for emptying the deaerator outwards;
(5) Closing a temperature control valve at the water inlet side of the fixed exhaust steam recovery device;
(6) Closing a temperature control valve on the water inlet side of the exhaust steam recovery device of the deaerator;
(7) Closing a manual stop valve for taking water from the slag cooler;
(8) Closing the low-level water pump;
(9) Closing a manual stop valve of the fixed-row drainage inlet heat exchanger;
(10) When the problem is eliminated, the devices are restarted.
The system of the utility model recovers the deaerator and discharges exhaust steam to the outside by about 3 tons/hour, the exhaust steam recovery device of the deaerator heats the condensed water temperature of the original unit of the thermal power plant from about 53 ℃ to about 93 ℃, the exhaust steam recovery device of the fixed exhaust heats the condensed water temperature of the original unit of the plant from about 53 ℃ to about 83 ℃, the water temperature of the low-level water tank is heated from about 23 ℃ to about 40 ℃ by utilizing about 10 tons/hour of the heat value of the fixed exhaust steam, the heating effect is obvious, the recovery utilization rate of the exhaust steam is high, the water formed by the exhaust steam recovery device and the water in the low-temperature water tank heated by the heat energy of the waste water discharged by the fixed exhaust steam recovery device are concentrated to the exhaust steam recovery water tank, and the waste water is sent to the deaerator by the variable frequency pump to be used as the water supplement of the deaerator, and the water consumption of the system demineralized water is reduced; the temperature of the recovered water is 80+/-5 ℃ when the recovered water returns to the deaerator through heat exchange, so that the condition that the temperature is too low when the original condensed water and low-level water in the factory are used for supplementing water to the deaerator is avoided, and a low-pressure heater is required for heating and boosting, so that the heat energy loss is reduced, and the utilization rate of the heat energy of the system is improved; and the waste steam heat exchange device recovers water formed by waste steam and the heat energy of the sewage discharged by the heat energy recovery fixed-connection-row flash vessel to heat the water in the low-temperature water tank as the water supplement of the deaerator, so that the oxygen dissolution in the working water of the deaerator is reduced, and the working efficiency of the deaerator is improved.
Claims (8)
1. A thermal power plant heat recovery system, characterized by: the device comprises a deaerator (1), a fixed-connection-row expansion vessel (3) and a steam trap, and further comprises a waste steam recovery device and a sewage heat recovery device, wherein the waste steam recovery device is respectively communicated with a steam side pipeline of the deaerator (1), a steam side pipeline of the fixed-connection-row expansion vessel (3) and a steam side pipeline of the steam trap, the waste steam recovery device is provided with a water return pipeline, and the waste steam recovery device is communicated with the water side pipeline of the deaerator (1) through the water return pipeline; the sewage heat energy recovery device is communicated with a sewage discharge pipeline of the fixed-connection row expansion vessel (3).
2. The thermal power plant heat energy recovery system of claim 1, wherein: the exhaust steam recovery device comprises an exhaust steam heat exchange device and an exhaust steam recovery water tank (6), the exhaust steam heat exchange device comprises a steam inlet pipeline, a water inlet pipeline and a water outlet pipeline, the steam inlet pipeline of the exhaust steam recovery device is respectively communicated with the steam side pipeline of the deaerator (1), the steam side pipeline of the fixed-connection expansion vessel (3) and the steam side pipeline of the steam trap, the water inlet pipeline of the exhaust steam recovery device is communicated with a cooling water pipeline, and the water outlet pipeline of the exhaust steam recovery device is communicated with the exhaust steam recovery water tank (6); the top of exhaust steam recovery water tank (6) sets up evacuating device, the bottom of exhaust steam recovery water tank (6) sets up the return line, return line and the water side pipeline intercommunication of deaerator (1).
3. The thermal power plant heat energy recovery system of claim 2, wherein: the exhaust steam heat exchange device is a hybrid heat exchanger.
4. A thermal power plant heat energy recovery system according to claim 3, characterized in that: and the cooling water pipeline is communicated with a condensate water pipeline of the original unit in the factory.
5. The thermal power plant heat energy recovery system of claim 4, wherein: the water return pipeline comprises a first water return pipeline and a second water return pipeline which are arranged in parallel, a common pump is arranged on the first water return pipeline, a standby pump is arranged on the second water return pipeline, and the first water return pipeline and the second water return pipeline are communicated with a water side pipeline of the deaerator (1).
6. The thermal power plant heat energy recovery system of claim 5, wherein: the utility model discloses a thermal power plant heat recovery system, including waste steam recovery water tank (6), liquid level sensor, controller electric connection, the converter of utility model and the converter of reserve pump all with controller electric connection, the utility model is the frequency conversion hot-water pump with reserve pump, thermal power plant heat recovery system sets up the controller, the inside of waste steam recovery water tank (6) sets up level sensor, level sensor and controller electric connection.
7. The thermal power plant heat energy recovery system of claim 6, wherein: the sewage heat energy recovery device is a dividing wall type heat exchanger, a cooling tank is arranged below the sewage heat energy recovery device, one end of a shell side of the dividing wall type heat exchanger is connected with a sewage discharge pipeline of the fixed continuous row expansion vessel (3), and the other end of the shell side of the dividing wall type heat exchanger is communicated with the cooling tank; one end of the tube side of the dividing wall type heat exchanger is communicated with the low-level water tank (7), the other end of the tube side of the dividing wall type heat exchanger is communicated with the exhaust steam recovery water tank (6), and a low-level water pump (8) is arranged between the low-level water tank (7) and the dividing wall type heat exchanger.
8. The thermal power plant heat energy recovery system of claim 7, wherein: a water outlet of the exhaust steam recovery device is provided with a temperature sensor, and the temperature sensor is electrically connected with the controller; the cooling water pipeline is provided with a flow valve, and the flow valve is electrically connected with the controller.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320499936.8U CN219243568U (en) | 2023-03-15 | 2023-03-15 | Thermal energy recovery system of thermal power plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320499936.8U CN219243568U (en) | 2023-03-15 | 2023-03-15 | Thermal energy recovery system of thermal power plant |
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| CN219243568U true CN219243568U (en) | 2023-06-23 |
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| CN202320499936.8U Active CN219243568U (en) | 2023-03-15 | 2023-03-15 | Thermal energy recovery system of thermal power plant |
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