Drain recovery system for steam turbine pipeline flash tank

Abstract

The invention relates to the technical field of thermal power plant steam turbine vacuum, in particular to a steam turbine pipeline flash tank drainage recovery system which comprises a conveying assembly, a pipeline flash tank, a storage device, an atmosphere water delivery device, a condenser and a recovery assembly. The recycling assembly further comprises a low-vacuum quick-break valve module, a drain tank water level adjusting valve set module, a sealing water quick-break valve module, a sealing water adjusting valve set module and a drain-to-fixed-drainage adjusting valve module, and a water seal is arranged at the joint of the storage device and the low-vacuum quick-break valve module. According to the external condenser drain recovery system of the water seal device, a user can select and install related modules according to actual on-site requirements due to the modular design, so that the transformation construction amount is reduced, the safety and reliability of equipment are improved, the automation level is improved, the working intensity of personnel is reduced, and the enterprise cost is reduced; safe and stable operation of main equipment can be guaranteed, and economic benefits of enterprises are improved.

Description

Technical Field

[0001] This invention relates to the field of vacuum technology for steam turbines in thermal power plants, and in particular to a steam turbine pipeline expansion tank condensate recovery system. Background Technology

[0002] A water seal device uses a certain level of hydrostatic pressure to resist changes in air pressure within the drain pipe, preventing gas from entering the condenser chamber. In the current context of electricity market liberalization, during the deep load shaving process of thermal power plant turbine generator units, the condensate water used as the sealing water source for the water seal device changes significantly with the large-scale adjustment of the unit load. At the same time, the turbine vacuum also changes. When the load decreases, the condenser vacuum increases, which pulls the sealing water of the water seal device out, naturally allowing a large amount of non-condensable gas to enter the condenser, causing the vacuum to drop and resulting in an unsafe event where the turbine generator unit shuts down due to low vacuum protection.

[0003] In the current environment where thermal power plants participate in deep peak shaving of the power grid, after the condensate recovery system with water seal device is connected to the condenser, the working conditions of the water seal device change drastically, and the pressure of the condensate water used for sealing the water seal device fluctuates greatly. The combined effect of these two factors causes the water seal device to fail, and a large amount of non-condensable gas enters the condenser, causing an unsafe event of the turbine generator unit shutting down due to low vacuum protection. Summary of the Invention

[0004] In view of the problems existing in the prior art, the present invention is proposed.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a steam turbine pipeline expansion tank condensate recovery system, comprising a conveying assembly including a pipeline expansion tank, a storage tank, an atmosphere water conveyor, and a condenser; and,

[0006] Recycle components.

[0007] As a preferred embodiment of the steam turbine pipeline expansion container condensate recovery system of the present invention, the condenser includes a hot water well.

[0008] As a preferred embodiment of the turbine pipeline expansion container condensate recovery system of the present invention, the recovery component further includes a low vacuum quick-closing valve module, a condensate tank water level regulating valve group module, a sealing water quick-closing valve module, a sealing water regulating valve group module, and a condensate to fixed discharge regulating valve module.

[0009] As a preferred embodiment of the steam turbine pipeline expansion container condensate recovery system of the present invention, a water seal is provided at the connection between the storage device and the low vacuum quick-closing valve module.

[0010] As a preferred embodiment of the steam turbine pipeline expansion container condensate recovery system of the present invention, wherein the inlet of the atmosphere water conveyor is connected to the low vacuum quick-closing valve module.

[0011] As a preferred embodiment of the steam turbine pipeline expansion container condensate recovery system of the present invention, the low vacuum quick-shutdown valve module includes a vacuum valve.

[0012] As a preferred embodiment of the steam turbine pipeline expansion container condensate recovery system of the present invention, wherein the condensate tank water level regulating valve group module includes a sensing signal tube.

[0013] As a preferred embodiment of the steam turbine pipeline expansion container drainage recovery system of the present invention, the sealing water quick-shutdown valve module includes a pneumatic control system.

[0014] As a preferred embodiment of the steam turbine pipeline expansion container drainage recovery system of the present invention, the sealing water regulating valve group module includes a sealing element.

[0015] As a preferred embodiment of the steam turbine pipeline expansion container condensate recovery system of the present invention, the condensate drain regulating valve module includes a condensate drain valve.

[0016] The beneficial effects of this invention are as follows: Through the external condenser drainage recovery system of the water seal device, the modular design allows users to select relevant modules according to actual site needs, reducing the amount of modification and construction work, improving the safety and reliability of the equipment, increasing the level of automation, reducing the workload of personnel, and reducing enterprise costs. It can ensure the safe and stable operation of the main equipment and improve the economic benefits of the enterprise. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0018] Figure 1 This is a diagram of the hydrophobic recovery system in this invention.

[0019] Reference numerals: 100, Conveying assembly; 101, Pipeline expansion container; 102, Storage container; 103, Atmosphere water conveyor; 104, Condenser; 104a, Hot water well; 200, Recovery assembly; 201, Low vacuum quick-closing valve module; 202, Drainage tank level regulating valve assembly module; 203, Sealing water quick-closing valve module; 204, Sealing water regulating valve assembly module; 205, Drainage to constant discharge regulating valve module. Detailed Implementation

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0022] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0023] Example 1, referring to Figure 1 This is the first embodiment of the present invention, which provides a steam turbine pipeline expansion tank condensate recovery system, comprising a conveying assembly 100, including a pipeline expansion tank 101, a storage tank 102, an atmosphere water conveyor 103, and a condenser 104; and,

[0024] 200 recycled components.

[0025] The condenser 104 includes a hot water well 104a.

[0026] In manual / automatic mode, the drainage flow rate of pipeline expansion container 101 is adjusted according to the water level setpoint of the water level measuring point to ensure the normal water level of pipeline expansion container 101. In case of abnormal water level, the opening of the boiler constant discharge regulating valve below pipeline expansion container 101 is adjusted through the interlocking program of this module group to maintain the water level of pipeline expansion container.

[0027] Usage: In manual / automatic mode, the water flow rate of the water seal in the storage device 102 is adjusted according to the change in the drainage flow rate of the expansion container 101 in the pipeline and the change in the pressure signal of the pressure measuring point of the water seal device to ensure that the water seal device operates under a slight positive pressure condition, thereby ensuring smooth drainage. In abnormal conditions, the water seal device is always kept in a slight positive pressure state.

[0028] Example 2, refer to Figure 1 The second embodiment of the present invention provides a steam turbine pipeline expansion container condensate recovery system, which includes the recovery component 200 and further includes a low vacuum quick-closing valve module 201, a condensate tank water level regulating valve group module 202, a sealing water quick-closing valve module 203, a sealing water regulating valve group module 204, and a condensate to fixed discharge regulating valve module 205.

[0029] A water seal is provided at the connection between the storage device 102 and the low vacuum quick-break valve module 201.

[0030] The inlet of the atmosphere water supply device 103 is connected to the low vacuum quick-closing valve module 201.

[0031] When flushing the drainage pipe / drainage tank, the drainage tank water level regulating valve group module 202 and the drainage to fixed discharge regulating valve module 205 can achieve the flushing function by setting the drainage tank water level separately according to user needs, or by adjusting the valve opening in manual mode.

[0032] Usage process: By opening the valve, the low vacuum quick-cut valve module 201 opens, the condensate tank water level regulating valve group module 202 regulates the water level of the condensate tank through DCS program control, the sealing water quick-cut valve module 203 opens, the sealing water regulating valve group module 204 ensures the water seal device is in a slightly positive pressure state through DCS program control, and the condensate to constant discharge regulating valve module 205 closes and is ready for standby.

[0033] Example 3, referring to Figure 1 This is the third embodiment of the present invention, which provides a steam turbine pipeline expansion container condensate recovery system, which includes a low vacuum quick-closing valve module 201 including a vacuum valve.

[0034] The condensate tank level regulating valve assembly module 202 includes a sensing signal tube.

[0035] The sealed water quick-shutdown valve module 203 includes a pneumatic control system.

[0036] The sealed water regulating valve assembly module 204 includes a seal.

[0037] The drain-to-constant regulating valve module 205 includes a drain valve.

[0038] Usage: When the turbine unit vacuum is abnormal, when the sealing water supply main pipe pressure is abnormal, or when the pipeline expansion tank system is abnormal, this module system will still quickly close the low vacuum instantaneous shut-off valve module 201 and close the condensate tank water level regulating valve group module 202 through DCS program control commands, and open the condensate to regular discharge regulating valve module 205. The condensate discharge will be switched to the boiler periodic blowdown expansion tank, and the discharge to the condenser will be stopped. According to the DCS program alarm action, the sealing water instantaneous shut-off valve module 203 and the sealing water regulating valve group module 204 will be activated to ensure the water seal device is in a slightly positive pressure state.

[0039] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0040] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0041] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A steam turbine pipeline expansion tank condensate recovery system, characterized in that: include, The delivery assembly (100) includes a pipeline expansion vessel (101), a storage tank (102), an atmosphere water delivery unit (103), and a condenser (104); and, Recycled components (200).

2. The steam turbine pipeline expansion tank condensate recovery system as described in claim 1, characterized in that: The condenser (104) includes a hot water well (104a).

3. The steam turbine pipeline expansion tank condensate recovery system as described in claim 2, characterized in that: The recovery assembly (200) also includes a low vacuum quick-shut-off valve module (201), a condensate tank water level regulating valve group module (202), a sealing water quick-shut-off valve module (203), a sealing water regulating valve group module (204), and a condensate to fixed discharge regulating valve module (205).

4. The steam turbine pipeline expansion tank condensate recovery system as described in claim 3, characterized in that: A water seal is provided at the connection between the storage device (102) and the low vacuum quick-break valve module (201).

5. The steam turbine pipeline expansion tank condensate recovery system as described in claim 4, characterized in that: The inlet of the atmosphere water supply device (103) is connected to the low vacuum quick-shut-off valve module (201).

6. The steam turbine pipeline expansion tank condensate recovery system as described in claim 5, characterized in that: The low-vacuum quick-break valve module (201) includes a vacuum valve.

7. The steam turbine pipeline expansion tank condensate recovery system as described in claim 6, characterized in that: The condensate tank water level regulating valve assembly module (202) includes a sensing signal tube.

8. The steam turbine pipeline expansion tank condensate recovery system as described in claim 7, characterized in that: The sealed water quick-shut-off valve module (203) includes a pneumatic control system.

9. The steam turbine pipeline expansion tank condensate recovery system as described in claim 8, characterized in that: The sealed water regulating valve assembly module (204) includes a seal.

10. The steam turbine pipeline expansion tank condensate recovery system as described in claim 9, characterized in that: The hydrophobic to fixed discharge regulating valve module (205) includes a hydrophobic valve.

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