Water replenishing equipment for deaerator

Abstract

The utility model discloses water replenishing equipment for a deaerator, which relates to the technical field of deaerators and comprises the deaerator, a water level adjusting door of the deaerator is connected with an external desalting water source, and the deaerator is further connected with an external heating steam source. The non-condensed gas of the deaerator is discharged through the deaerator exhaust port and enters the shaft seal heater through the main door of the shaft seal heater, the primary door of the shaft seal heater and the secondary door of the shaft seal heater in sequence; a water tank of the deaerator is connected with a feed pump through a drainage mother pipe, the feed pump provides make-up water for a boiler, a main steam pipeline of the boiler is connected with an air inlet pipeline of a turbine, an exhaust port of the turbine is connected with a condenser, and condensed water in the condenser enters the shaft seal heater sequentially through a condensate pump and an inlet water gate of the shaft seal heater. The water enters the low-pressure heater through an outlet water door of the shaft seal heater and an inlet water door of the low-pressure heater in sequence; an outlet water door of the low-pressure heater is connected to a deaerator condensation water door through a condensation water main pipe and enters the deaerator.

Description

Technical Field

[0001] The utility model relates to the technical field of deaerators, and particularly relates to a deaerator water replenishing device. Background Art

[0002] In the field of modern power production, the design and optimization of the thermal system are crucial for improving energy efficiency and reducing environmental impact. Traditional thermal systems, including key components such as boilers, steam turbines, condensers, and deaerators, although playing a fundamental role in power production, still have some limitations and deficiencies.

[0003] In traditional thermal systems, the exhaust steam discharged from the steam turbine directly enters the condenser and condenses into water, and a large amount of thermal energy fails to be effectively recovered and utilized. Moreover, in the process of removing oxygen from water in existing deaerators, additional thermal energy is often required. Due to the waste of exhaust steam thermal energy and the efficiency problem of deaerators, the thermal efficiency of the entire thermal system is relatively low, affecting the energy utilization efficiency. Summary of the Utility Model

[0004] Therefore, the embodiment of the utility model provides a deaerator water replenishing device to solve the above-mentioned technical problems.

[0005] In order to achieve the above purpose, the embodiment of the utility model provides the following technical solutions:

[0006] A deaerator water replenishing device includes a deaerator. The water level adjusting valve of the deaerator is connected to an external desalinated water source, and the deaerator is also connected to an external heating steam source. The non-condensable gas of the deaerator is discharged through the deaerator exhaust port and sequentially passes through the main valve of the gland heater, the primary valve of the gland heater, and the secondary valve of the gland heater to enter the gland heater;

[0007] The water tank of the deaerator is connected to a feed water pump through a downcomer main pipe. The feed water pump provides make-up water for the boiler. The main steam pipe of the boiler is connected to the intake pipe of the steam turbine. The exhaust port of the steam turbine is connected to the condenser. The condensate water in the condenser sequentially enters the gland heater through the condensate pump and the inlet water valve of the gland heater; and then sequentially passes through the outlet water valve of the gland heater and the inlet water valve of the low-pressure heater to enter the low-pressure heater; the outlet water valve of the low-pressure heater is connected to the deaerator condensate water valve through a condensate water main pipe and enters the deaerator.

[0008] Optionally, the front steam seal and the rear steam seal of the steam turbine are both connected to a steam seal main pipe. The other end of the steam seal main pipe is connected to the main steam seal valve of the gland heater. The gland heater is connected to a water seal cylinder, and the water seal cylinder is connected to the hot well of the condenser;

[0009] The exhaust port of the gland heater is connected to a gland cooler fan to discharge the non-condensable gas in the gland heater to the atmosphere.

[0010] Optionally, a manual deaeration valve is connected to the deaerator.

[0011] Optionally, an electric deaeration valve is connected to the deaerator.

[0012] Optionally, the low-pressure heater heats the condensate water through three-stage extraction steam.

[0013] The utility model has at least the following beneficial effects:

[0014] By arranging a general seal heater valve, a primary seal heater valve and a secondary seal heater valve between the deaerator and the gland heater, the non-condensable gas in the deaerator is discharged into the steam side of the gland heater through the three valves. Among them, the primary seal heater valve is used as a regulating valve for discharging the exhaust steam of the deaerator, which is adjusted according to the oxygen content in the deaerator to minimize the discharge amount of the exhaust steam of the deaerator; the general seal heater valve and the secondary seal heater valve are used as isolation valves and are used when withdrawing, overhauling or in case of failure, which can recover a large amount of heat of the exhaust steam of the deaerator and play an obvious role in energy conservation and consumption reduction. Description of the Drawings

[0015] In order to more clearly illustrate the prior art and the present utility model, the drawings required for describing the prior art and the embodiments of the present utility model will be briefly introduced below. Obviously, the drawings in the following description are only exemplary, and those of ordinary skill in the art can also obtain other drawings according to the provided drawings without creative efforts.

[0016] The structures, ratios, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the limited conditions under which the present utility model can be implemented. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model.

[0017] Figure 1 It is a schematic diagram of the principle structure of an embodiment of the present utility model.

[0018] Description of the Reference Numerals in the Drawings

[0019] 1. Deaerator; 2. Water level regulating valve; 3. Deaerator exhaust port; 4. General seal heater valve; 5. Primary seal heater valve; 6. Secondary seal heater valve; 7. Gland heater; 8. Feed water pump; 9. Steam turbine; 10. Condenser; 11. Condensate pump; 12. Low-pressure heater; 13. Condensate water valve; 14. Water seal drum; 15. Shaft cooling fan. Detailed Embodiments

[0020] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0021] In the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more. The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present utility model and the above-mentioned drawings are intended to distinguish the objects being referred to. For a solution with a time sequence process, this way of term expression does not have to be understood as describing a specific order or sequence. For a solution of a device structure, this way of term expression also does not distinguish the importance degree, positional relationship, etc.

[0022] In addition, the terms "comprise", "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to the steps or units that are clearly listed, but may also include other steps or units that are inherent to these processes, methods, products or devices but are not clearly listed, or steps or units added based on further optimized solutions conceived by the present utility model.

[0023] As Figure 1 shown, a deaerator make-up water device disclosed by the present utility model includes a deaerator 1. The water level adjustment valve 2 of the deaerator 1 is connected to an external desalinated water source. The deaerator 1 is also connected to an external heating steam source. The non-condensable gas of the deaerator 1 is discharged through the deaerator exhaust port 3 and sequentially passes through the gland heater main valve 4, the gland heater primary valve 5 and the gland heater secondary valve 6 and enters the gland heater 7.

[0024] The water tank of the deaerator 1 is connected to a feed water pump 8 through a downcomer main pipe. The feed water pump 8 provides make-up water for the boiler. The main steam pipe of the boiler is connected to the intake pipe of a steam turbine 9. The exhaust port of the steam turbine 9 is connected to a condenser 10. The condensed water in the condenser 10 sequentially passes through a condensate pump 11 and the inlet water valve of the gland heater and enters the gland heater 7; then sequentially passes through the outlet water valve of the gland heater 7 and the inlet water valve of a low-pressure heater 12 and enters the low-pressure heater 12; the outlet water valve of the low-pressure heater 12 is connected to the deaerator condensate valve 13 through a condensate main pipe and enters the deaerator 1.

[0025] The demineralized water passes through the deaerator water level regulating valve 2 to replenish water to the deaerator 1, ensuring that the water level in the deaerator 1 is within the specified range in the regulations; at the same time, the deaerator pressure regulating valve is adjusted to ensure that the internal working pressure of the deaerator is within the specified range in the regulations. In the deaeration tower, the demineralized water is heated by steam to dilute the non-condensable gases in the water. The non-condensable gases are discharged into the steam side of the gland heater 7 through the No. 1 valve (the main valve 4 for deaerator exhaust steam to the gland heater), the No. 2 valve (the first-stage valve 5 for deaerator exhaust steam to the gland heater), and the No. 3 valve (the second-stage valve 6 for deaerator exhaust steam to the gland heater).

[0026] Among them, the No. 2 valve is used as the deaerator exhaust steam discharge regulating valve, which is adjusted according to the oxygen content in the deaerator to minimize the exhaust steam emission of the deaerator; the No. 1 valve and the No. 3 valve are used as isolation valves and are used when withdrawing, overhauling or in case of failure.

[0027] The deaerator 1 is connected with a manual oxygen discharge valve. The deaerator is connected with an electric oxygen discharge valve. The non-condensable gases are discharged to the atmosphere through the manual oxygen discharge valve, and the electric oxygen discharge valve serves as a standby exhaust valve to the atmosphere and is remotely operated to open in case of emergency.

[0028] In a further embodiment, an "automatic" on / off function is added to the original electric oxygen discharge valve. During normal operation, this valve is in the closed state; after turning on the automatic function, when the operating condition of the steam turbine 9 changes significantly and the pressure in the deaerator is lower than 0.1 Mpa, a closing signal is sent to this valve again (although it is in the closed state) to prevent accidental opening from affecting the vacuum drop of the steam seal system; when the pressure rises to 0.3 Mpa, the electric oxygen discharge valve is opened to prevent the deaerator safety valve from operating.

[0029] The front steam seal and the rear steam seal of the steam turbine 9 are both connected to a steam seal header. The other end of the steam seal header is connected to the main steam seal valve of the gland heater. The gland heater 7 is connected to the water seal cylinder 14, and the water seal cylinder 14 is connected to the hot well of the condenser 10.

[0030] The exhaust port of the gland heater 7 is connected to the shaft cooling fan 15 to discharge the non-condensable gases in the gland heater 7 to the atmosphere.

[0031] The demineralized water after deaeration enters the water tank of the deaerator 1, and after entering the deaerator lower water header pipe, it is boosted by the feed water pump 8 and used as boiler make-up water. After being heated and raised in temperature by the boiler, it becomes superheated steam (new steam), enters the steam turbine 9 through the main steam pipeline to do work, and the steam that has done work enters the condenser 10 for heat exchange to generate condensate water. After passing through the condensate pump and the inlet water valve of the shaft addition port, it enters the gland heater 7 as the cooling water of the gland heater 7, flows out through the outlet water valve of the gland heater, and then enters the low-pressure heater 12 again through the inlet water valve of the low-pressure heater 12. After being heated and raised in temperature by using the extraction steam of the third stage in the low-pressure heater 12, it flows out through the outlet water valve of the low-pressure heater 12, passes through the condensate water header pipe and the deaerator condensate water valve 13, and then enters the deaerator 1 again for the next cycle.

[0032] During the process of the new steam from the boiler entering the steam turbine 9 to do work, part of the steam will overflow through the front and rear steam seals, enter the shaft seal heater 7 through the steam seal header and the main steam seal valve, exchange heat with the condensate entering through the condensate inlet valve of the shaft, condense the steam overflowing from the steam seal into water (while heating the condensate entering through the condensate inlet valve of the shaft), and enter the hot well of the condenser 10 through the water seal cylinder 14. The non-condensable gas in the shaft seal heater 7 is discharged to the atmosphere through the shaft cooling fan 15.

[0033] The above-mentioned shaft heater is the shaft seal heater 7, and the low heater is the low-pressure heater 12;

[0034] This transformation is applicable to production processes with a small make-up water volume for the deaerator, such as pure power generation enterprises, which can recover a large amount of the heat of the deaerator exhaust steam and play an obvious role in energy conservation and consumption reduction; it is not applicable to production processes with a large make-up water volume for the deaerator, such as power generation enterprises mainly for heating. Reason: A large make-up water volume for the deaerator will cause a large amount of non-condensable gas to be discharged, resulting in overloading of the shaft seal heater and affecting the vacuum of the condenser.

[0035] The above several specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in some embodiments.

[0036] The technical features of the above embodiments can be combined arbitrarily (as long as there is no contradiction in the combination of these technical features). For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written out should also be considered to be within the scope described in this specification.

[0037] In the above text, the present invention has been described in a relatively specific and detailed manner through general descriptions and specific embodiments. It should be noted that without departing from the concept of the present invention, it is obvious that several deformations and improvements can still be made to these specific embodiments, and these all belong to the protection scope of this application. Therefore, the protection scope of the patent of this application should be subject to the appended claims.

Claims

1. A deaerator make-up water device, characterized in that: It includes a deaerator. The water level regulating valve of the deaerator is connected to an external desalination water source. The deaerator is also connected to an external heating steam source. The non-condensable gas in the deaerator is discharged through the exhaust port of the deaerator and enters the shaft seal heater successively through the main valve of the shaft seal heater, the primary valve of the shaft seal heater, and the secondary valve of the shaft seal heater. The water tank of the deaerator is connected to a feed water pump through a downcomer main pipe. The feed water pump provides make-up water for the boiler. The main steam pipe of the boiler is connected to the intake pipe of the steam turbine. The exhaust port of the steam turbine is connected to a condenser. The condensate water in the condenser enters the shaft seal heater successively through a condensate pump and the inlet water valve of the shaft seal heater; then it enters the low-pressure heater successively through the outlet water valve of the shaft seal heater and the inlet water valve of the low-pressure heater; the outlet water valve of the low-pressure heater is connected to the deaerator through a condensate water main pipe and enters the deaerator through the condensate water valve of the deaerator.

2. The deaerator make-up water equipment according to claim 1, characterized in that: Both the front steam seal and the rear steam seal of the steam turbine are connected to a steam seal header. The other end of the steam seal header is connected to the main valve of the shaft seal heater. The shaft seal heater is connected to a water seal cylinder, and the water seal cylinder is connected to the hot well of the condenser. The exhaust port of the shaft seal heater is connected to a shaft cooling fan to discharge the non-condensable gas in the shaft seal heater to the atmosphere.

3. A deaerator make-up water device according to claim 1, characterized in that: The deaerator is connected with a manual oxygen exhaust valve.

4. The deaerator make-up water device according to claim 3, wherein: The deaerator is connected with an electric oxygen exhaust valve.

5. The deaerator make-up water device according to claim 1, characterized in that: The condensate water in the low-pressure heater is heated by three-stage extraction steam.

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