Condensed water deoxidizing system of air cooling generator set
By designing a condensate deoxygenation system in an air-cooled generator set, deoxygenation is performed using gravity and atomization spraying technology, and further eliminating the supercooling and dissolved oxygen through hydrophobic heating and bubble nozzle technology, the problem of the heater's hydrophobic heat in the air-cooling generator set is solved, and the condensate supercooling and dissolved oxygen exceeding the standard is improved, improving the economic and safety of the unit.
Patent Information
- Application Number
- CN202411772327.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2025-02-28
AI Technical Summary
Due to the limitations of equipment arrangement, the air-cooled generator sets arranged in full-high positions have difficulty in heater hydrophobicity, and the heat carried by the hydrophobicity is not fully utilized, resulting in a reduction in the economicality of the unit. At the same time, the condensate has supercooling and dissolved oxygen exceeding the standard, affecting the economical and safety of the unit.
A condensate deoxygenation system for air-cooled generator sets is designed, including a steam turbine, an air condenser, an oxygen deoxygenation device and an atomization spray nozzle. By arranging the deoxygenation device below the air condenser, the condensed water is introduced into the deoxygenation device by gravity, and atomization deoxygenation is achieved through the atomization spray nozzle. At the same time, the condensed water is heated by the hydrophobicity of the low-pressure heater and the hydrophobicity of the steam turbine to eliminate the supercooling degree and the dissolved oxygen overflow is driven through the bubble nozzle.
It effectively solves the problem that the heater's hydrophobic heat is underutilized, eliminates the excessive cooling of condensate and the excess dissolved oxygen of the condensate, improves the economy and safety of the generator set, and enhances the deoxygenation effect.
Smart Images
Figure CN119532719A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of condensate deoxygenation of generator sets, and in particular to a condensate deoxygenation system of an air-cooled generator set. Background Art
[0002] In air-cooled steam turbine generator sets, dissolved oxygen in condensate is one of the main indicators of chemical supervision, especially large direct air-cooled steam turbine generator sets have higher requirements for the dissolved oxygen content in condensate. After condensate with excessive dissolved oxygen enters the heat exchange system and the auxiliary pipes of the heat exchange system, the galvanic effect causes electrochemical corrosion of the metal parts inside the pipes, which seriously threatens the safety of the unit operation. At the same time, the heat exchanger of the steam turbine heat recovery system will form a film on the surface of the heat exchange tube due to the accumulated corrosion products, which increases the heat transfer resistance, reduces the heat recovery efficiency, and has an adverse effect on the economy of the unit. The condensate of the direct air-cooled unit generally has condensate supercooling. In order to eliminate the condensate supercooling, it is necessary to increase the system's steam extraction load, resulting in energy loss and reducing the overall output of the steam turbine generator set.
[0003] For direct air-cooled steam turbine generator sets arranged at an all-height position, the heaters at various stages of the heat recovery system, exhaust devices (pipes), and air-cooled condensers are arranged in a vertical space with a large height difference. Due to the limitations of equipment layout, it is difficult to drain the heaters, and the heat carried by the drain is not fully utilized, reducing the economy of the unit. Summary of the invention
[0004] The present invention aims to solve the problem that the heat carried by the drained water is not fully utilized, thereby reducing the economy of the unit, and solves the problem that the condensate of the air-cooled unit is supercooled and carries excessive dissolved oxygen, thereby reducing the economy and safety of the unit. A condensate deoxygenation system for an air-cooled generator set is provided to solve the problems raised in the above-mentioned background technology.
[0005] The technical solution of the present invention is:
[0006] A condensate deoxidation system for an air-cooled generator set comprises a steam turbine, an air-cooled condenser, a deoxidation device and an atomizing spray nozzle, wherein the steam outlet of the steam turbine is connected to the steam inlet of the air-cooled condenser, the deoxidation device is provided with an atomizing spray nozzle, the water outlet pipe of the air-cooled condenser is connected to the atomizing spray nozzle in the deoxidation device, the deoxidation device is arranged below the air-cooled condenser, and the condensate flows out of the air-cooled condenser and enters the deoxidation device under the action of gravity and realizes atomization deoxidation through the atomizing spray nozzle arranged in the deoxidation device;
[0007] Furthermore, it also includes a low-pressure heater I, a low-pressure heater II, a low-pressure heater III, a low-pressure heater IV and a drain nozzle. Two groups of drain nozzles are arranged in the deoxygenation device. The drain from the low-pressure heater II is sprayed into the deoxygenation device through one group of drain nozzles, and the drain from the low-pressure heater IV is sprayed into the deoxygenation device through another group of drain nozzles.
[0008] Furthermore, it also includes a steam turbine high-pressure body drain pipe and a steam turbine low-pressure body drain pipe, and the steam turbine high-pressure body drain pipe and the steam turbine low-pressure body drain pipe are both connected to the bottom of the deaerator.
[0009] Furthermore, it also includes a deoxygenation auxiliary steam pipeline, a regulating valve and a bubbling nozzle. The bottom of the deoxygenation device is provided with a bubbling nozzle, the bubbling nozzle is connected to the turbine auxiliary steam system through the deoxygenation auxiliary steam pipeline, and the deoxygenation auxiliary steam pipeline is provided with a regulating valve.
[0010] Furthermore, a steam balance pipe is arranged above the deaerator, and the other end of the steam balance pipe is connected to the steam outlet of the steam turbine.
[0011] Furthermore, a vacuum pipe is arranged above the deoxygenation device, and the vacuum pipe is connected to a vacuum pump.
[0012] Furthermore, the water outlet of the deaerator is connected to a condensate water pipeline of a heat recovery system, and the condensate water pipeline of the heat recovery system is sequentially connected to low-pressure heater IV, low-pressure heater III, low-pressure heater II and low-pressure heater I.
[0013] Compared with the prior art, the present invention has the following beneficial effects:
[0014] 1. A condensate deoxidation system for an air-cooled generator set, wherein a deoxidation device is arranged below an air-cooled condenser, so that the condensate discharged from the air-cooled condenser flows into the atomizing spray nozzle in the deoxidation device through a pipeline under the action of gravity, and is atomized and sprayed out through the atomizing spray nozzle, forming extremely small mist droplets in the steam side space above the deoxidation device. In the process of the condensate being atomized and broken into mist droplets, most of the oxygen dissolved in the condensate will escape quickly.
[0015] 2. The drain from low-pressure heater II and low-pressure heater IV is respectively introduced into the condensate liquid surface in the deaerator through two sets of pipelines. The drain and the condensate in the deaerator are fully mixed for heat transfer. The heat carried by the drain is used to heat the condensate, eliminate the supercooling of the condensate, reduce the oxygen dissolving capacity of the condensate, and further implement the deoxygenation effect.
[0016] 3. A steam turbine high-pressure body drain pipe and a steam turbine low-pressure body drain pipe are connected below the condensate level of the deaerator. The high-temperature steam turbine high-pressure body drain and the steam turbine low-pressure body drain are introduced into the deaerator and fully mixed with the condensate in the deaerator for heat transfer, so as to further heat the condensate, eliminate the supercooling of the condensate, reduce the oxygen dissolving capacity of the condensate, and further implement the deoxygenation effect.
[0017] 4. A bubbling nozzle for spraying turbine auxiliary steam is arranged below the condensate surface of the deaerator. The turbine auxiliary steam forms a large number of bubbles through the bubbling nozzle. Since the bubbles are fine and have a high flow rate, the contact area with the condensate is large and the condensate can be fully contacted with the condensate for heat transfer. In the process of the bubbles rising, the dissolved oxygen in the condensate can be driven to overflow to achieve deoxygenation. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is the piping flow chart of the condensate deaeration system of the air-cooled generator set;
[0019] Figure 2 This is a flow chart of the deoxygenation steps of the condensate deoxygenation system of an air-cooled generator set.
[0020] In the figure: 1. Steam turbine; 2. Air-cooled condenser; 3. Deaerator; 301. Atomizing spray nozzle; 302. Drain nozzle; 303. Bubbling nozzle; 4. Vacuum pump; 5. Condensate pipe of heat recovery system; 6. Low-pressure heater I; 7. Low-pressure heater II; 8. Low-pressure heater III; 9. Low-pressure heater IV; 10. Steam balance pipe; 11. Drain pipe of high-pressure body of steam turbine; 12. Drain pipe of low-pressure body of steam turbine; 13. Deaerator auxiliary steam pipe; 14. Control valve. DETAILED DESCRIPTION
[0021] Specific implementation method 1: See Figure 1 and 2 The principle of atomizing spray nozzle 301 to realize atomizing deoxygenation is introduced. A condensate deoxygenation system for an air-cooled generator set is provided. This embodiment includes a steam turbine 1, an air-cooled condenser 2, a deoxygenation device 3 and an atomizing spray nozzle 301. The steam outlet of the steam turbine 1 is connected to the steam inlet of the air-cooled condenser 2. The atomizing spray nozzle 301 is installed in the deoxygenation device 3. The condensate outlet pipe of the air-cooled condenser 2 is connected to the atomizing spray nozzle 301 in the deoxygenation device 3. The deoxygenation device 3 is arranged below the air-cooled condenser 2. After the condensate flows out of the air-cooled condenser 2, it passes through the atomizing spray nozzle 301 under the action of gravity to realize atomizing spray deoxygenation.
[0022] Furthermore, the steam of the steam turbine 1 first enters the air-cooled condenser 2, and liquefaction and condensation are completed in the air-cooled condenser 2. Since the deaerator 3 is arranged below the air-cooled condenser 2, the condensed water flows downward into the deaerator 3 in the air-cooled condenser 2 under the action of gravity, and the condensed water is atomized by the atomizing spray nozzle 301 and sprayed in the steam side space in the deaerator 3. The atomizing spray nozzle 301 forms the condensed water into mist droplets. In the process of atomization and breaking into mist droplets, most of the oxygen dissolved in the condensed water will escape in this process, and heat exchange with the steam in the deaerator 3 to increase the temperature and deoxygenate. With this arrangement method, the pressurization effect of the condensate pump is replaced by gravity, eliminating the use of the water pump and the electricity used for the water pump.
[0023] Specific implementation method 2: See Figure 1 and 2 As shown, this embodiment also includes a low-pressure heater I6, a low-pressure heater II7, a low-pressure heater III8, a low-pressure heater IV9 and a drain nozzle 302. Two groups of drain nozzles 302 are arranged in the deoxygenation device 3. The drain from the low-pressure heater II7 is sprayed into the deoxygenation device 3 through one group of drain nozzles 302, and the drain from the low-pressure heater IV9 is sprayed into the deoxygenation device 3 through another group of drain nozzles 302.
[0024] Furthermore, low-pressure heater I6, low-pressure heater II7, low-pressure heater III8, and low-pressure heater IV9 constitute the unit heat recovery system. In the unit heat recovery system, the low-pressure heater II7 is restricted by its height arrangement, and its drain cannot enter the low-pressure heater III8 arranged at a higher position. Therefore, the drain generated by the low-pressure heater II7 is directly connected to the deaerator 3, and the drain generated by the low-pressure heater IV9 is directly connected to the deaerator 3, and is sprayed into the liquid side of the deaerator 3 through two groups of drain nozzles 302. The drain is fully mixed with the condensate in the deaerator 3 for heat transfer, and the heat carried by the drain is used to heat the condensate, eliminate the supercooling of the condensate, reduce the oxygen dissolving capacity of the condensate, and further implement the deoxygenation effect.
[0025] Specific implementation method three: See Figure 1 and 2 As shown, this embodiment further includes a steam turbine high-pressure body drain pipe 11 and a steam turbine low-pressure body drain pipe 12 , and the steam turbine high-pressure body drain pipe 11 and the steam turbine low-pressure body drain pipe 12 are both connected to the bottom of the deaerator 3 .
[0026] Furthermore, a turbine high-pressure body drain pipe 11 and a turbine low-pressure body drain pipe 12 are connected to the bottom of the condensate of the deoxygenation device 3, and the high-temperature turbine high-pressure body drain and the turbine low-pressure body drain are introduced into the deoxygenation device 3 and fully mixed with the condensate for heat transfer, thereby further heating the condensate to reduce the oxygen dissolved in the condensate, thereby further implementing the deoxygenation effect.
[0027] Specific implementation method four: see Figure 1 and 2 As shown, this embodiment also includes a deoxygenation auxiliary steam pipeline 13, a regulating valve 14 and a bubbling nozzle 303. A group of bubbling nozzles 303 are arranged at the bottom of the deoxygenation device 3. The bubbling nozzle 303 is connected to the auxiliary steam of the turbine unit through the deoxygenation auxiliary steam pipeline 13. The regulating valve 14 is arranged on the deoxygenation auxiliary steam pipeline 13.
[0028] Furthermore, the bubbling nozzle 303 is arranged below the condensate level in the deaerator 3. Such arrangement allows the bubbles to contact the condensate at the maximum stroke during the rising process. The bubbling nozzle 303 sprays the auxiliary steam of the steam turbine unit into the condensate in the deaerator 3 to form a large number of bubbles. Since the bubbles are fine and have a high flow rate, the contact area with the condensate is large, and the bubbles can be fully contacted with the condensate for heat transfer. During the rising process of the bubbles, the dissolved oxygen in the condensate can be driven to overflow to achieve deoxygenation, and the condensate is heated by the latent heat of vaporization generated by steam condensation to reduce the dissolved oxygen in the condensate. The regulating valve 14 can decide whether to open or adjust the steam flow rate according to the dissolved oxygen content of the condensate at the outlet of the deaerator 3.
[0029] Specific implementation method five: see Figure 1 and 2 As shown, a steam balance pipe 10 is arranged above the deoxygenation device 3 of this embodiment, and the other end of the steam balance pipe 10 is connected to the steam outlet of the steam turbine 1.
[0030] Furthermore, the steam balance pipe 10 is connected to the top of the deoxygenator 3, and the steam balance pipe 10 is used to balance the pressure between the deoxygenator 3 and the turbine exhaust. The steam balance pipe 10 can introduce part of the turbine exhaust into the deoxygenator 3. After the condensate enters the deoxygenator 3, the droplets are atomized and fully contact and exchange heat with the turbine steam introduced by the steam balance pipe 10. The steam condenses on the surface of the droplets, and the latent heat of vaporization generated heats the condensate droplets, eliminates the supercooling of the condensate, reduces the oxygen dissolving capacity of the condensate, and further implements the deoxygenation effect. After the aforementioned hydrophobic water undergoes heat transfer deoxygenation with the condensate, if there is still excess heat, flash evaporation will occur in the deoxygenator 3. The steam flashed out of each hydrophobic water can enter the air-cooled condenser 2 through the balance pipe for cooling and condensation.
[0031] Specific implementation method six: see Figure 1 and 2 As shown, the deoxygenation device 3 of this embodiment is connected to a vacuum pump 4 above through a vacuum pipe.
[0032] Furthermore, the vacuum pump 4 is used to discharge the non-condensable gas escaping from the deoxygenation device 3 in a timely manner.
[0033] Specific implementation method seven: See Figure 1 and 2 As shown, the water outlet of the deoxygenation device 3 of this embodiment is connected to the heat recovery system condensate pipe 5, and the heat recovery system condensate pipe 5 is connected to the low-pressure heater IV9, the low-pressure heater III8, the low-pressure heater II7 and the low-pressure heater I6 in sequence.
Claims
1. A condensate deoxygenation system for an air-cooled generator set, characterized in that: The invention comprises a steam turbine (1), an air-cooled condenser (2), a deoxidizing device (3) and an atomizing spray nozzle (301); the steam outlet of the steam turbine (1) is connected to the steam inlet of the air-cooled condenser (2); the atomizing spray nozzle (301) is installed in the deoxidizing device (3); the water outlet pipe of the air-cooled condenser (2) is connected to the atomizing spray nozzle (301) in the deoxidizing device (3); the deoxidizing device (3) is arranged below the air-cooled condenser (2); after condensed water flows out of the air-cooled condenser (2), it enters the deoxidizing device (3) under the action of gravity and is atomized and deoxidized by passing through the atomizing spray nozzle (301) arranged in the deoxidizing device (3).
2. The condensate deoxygenation system for air-cooled generator set according to claim 1, characterized in that: The deaerator (3) further comprises a low-pressure heater I (6), a low-pressure heater II (7), a low-pressure heater III (8), a low-pressure heater IV (9) and a drain nozzle (302). Two groups of drain nozzles (302) are arranged in the deaerator (3). The drain from the low-pressure heater II (7) is sprayed into the deaerator (3) through one group of drain nozzles (302), and the drain from the low-pressure heater IV (9) is sprayed into the deaerator (3) through the other group of drain nozzles (302).
3. The condensate deoxygenation system for air-cooled generator set according to claim 2, characterized in that: It also includes a steam turbine high-pressure body drain pipe (11) and a steam turbine low-pressure body drain pipe (12), and the steam turbine high-pressure body drain pipe (11) and the steam turbine low-pressure body drain pipe (12) are both connected to the bottom of the deoxidation device (3).
4. The condensate deoxygenation system for air-cooled generator set according to claim 3, characterized in that: It also comprises a deoxidation auxiliary steam pipeline (13), a regulating valve (14) and a bubbling nozzle (303). The bottom of the deoxidation device (3) is provided with a bubbling nozzle (303). The bubbling nozzle (303) is connected to the auxiliary steam system of the steam turbine (1) through the deoxidation auxiliary steam pipeline (13). The deoxidation auxiliary steam pipeline (13) is provided with a regulating valve (14).
5. The condensate deoxygenation system for air-cooled generator set according to claim 4, characterized in that: A steam balance pipe (10) is arranged above the deoxygenation device (3), and the other end of the steam balance pipe (10) is connected to the steam outlet of the steam turbine (1).
6. The condensate deoxygenation system for air-cooled generator set according to claim 5, characterized in that: A vacuum pumping pipeline is arranged above the deoxygenation device (3), and the end of the vacuum pumping pipeline is connected to a vacuum pump (4).
7. The condensate deoxygenation system for air-cooled generator set according to claim 2, characterized in that: The water outlet of the deaerator (3) is connected to a heat recovery system condensate pipe (5), and the heat recovery system condensate pipe (5) is connected in sequence to a low-pressure heater IV (9), a low-pressure heater III (8), a low-pressure heater II (7) and a low-pressure heater I (6).