Intelligent adjusting system for sealing water of condensate pump

Abstract

The invention relates to the technical field of sealing water adjustment, and particularly discloses a condensate pump sealing water intelligent adjusting system which comprises at least two sealing water supply branches, an adjustable flow control assembly, a manual flow control assembly and an anti-backflow assembly. The sealing water supply branches are selectively connected into the water inlet end of the adjustable flow control assembly through the anti-backflow assembly, and the water outlet end of the adjustable flow control assembly is connected to the sealing end of the condensate pump through the manual flow control assembly so that the sealing requirements of the condensate pump in different operation stages can be met through the different sealing water supply branches. The adjustable flow control assembly is combined with two-stage adjustment logic to adapt to frequent and great change of unit loads, core adjustment and control components of the sealing water system are prevented from being damaged due to continuous pressure impact, the equipment overhaul frequency and replacement cost are reduced, and the system operation continuity is improved. Compared with a traditional manual gate valve, adjustment hysteresis and randomness are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sealing water adjustment, and particularly to an intelligent sealing water adjustment system for a condensate pump. BACKGROUND

[0002] In a thermal cycle system of a thermal power plant, a condensate pump, as a core auxiliary equipment, undertakes the key task of transporting condensate in a condenser to subsequent thermal equipment. Since the condensate pump inlet is directly connected to the condenser and needs to be maintained in a negative pressure operation state for a long time, the sealing performance of the condensate pump directly determines the safety and stability of the system. If the sealing fails and air leaks into the condensate pump body, the dissolved oxygen content in the condensate pump outlet header will be significantly increased, and high dissolved oxygen water will cause serious corrosion to subsequent pipelines, valves and thermal equipment, shorten the service life of the equipment, and even cause leakage, blockage and other faults, affecting the normal operation of the unit.

[0003] To ensure the sealing effect of the condensate pump, a pressure reducing valve control mode is generally used to construct a sealing water system in the prior art, that is, the pressure and flow of the sealing water are adjusted by the pressure reducing valve to ensure that the sealing water is injected into the sealing cavity at stable parameters to block the air inlet channel. However, with the increasing demand for peak regulation of the power system, the thermal power unit needs to be frequently switched between high load and low load, and the load variation amplitude often reaches more than 30%, resulting in that the operating condition of the condensate pump is in a dynamic fluctuation state. In this process, the pressure reducing valve needs to continuously withstand severe pressure impact and flow variation, and problems such as valve core wear, valve seat deformation and sealing element aging are prone to occur. The pressure reducing valve needs to be overhauled or replaced every 3-6 months on average, which not only increases the equipment maintenance cost, but also reduces the continuity of the unit operation.

[0004] Some power plants try to use a manual gate valve to replace the pressure reducing valve for sealing water adjustment in order to avoid frequent damage of the pressure reducing valve. However, this method has significant defects. On the one hand, the operation and maintenance personnel need to manually adjust the gate valve opening degree to control the sealing water parameters according to the unit load variation and the dissolved oxygen detection data of the condensate pump outlet header. However, the detection of the dissolved oxygen data has a delay of 5-10 minutes, which causes the adjustment action to lag behind the condition change, resulting in a dissolved oxygen fluctuation amplitude of the condensate pump outlet header of more than 0.05 mg / L, which is far more than the industry standard requirement of ≤0.02 mg / L, and there is still a risk of equipment corrosion. On the other hand, the unit load may change 5-8 times a day, and the operation and maintenance personnel need to frequently inspect and operate, which greatly increases the labor intensity, and the randomness of manual operation easily causes misadjustment, further aggravating the instability of the sealing water parameters. SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is that the existing condensate pump sealing water system of a thermal power plant is prone to damage due to pressure impact caused by frequent and large changes in unit load when a pressure reducing valve is used, and manual gate valve adjustment leads to large oxygen fluctuation in the outlet header and large operation and maintenance workload.

[0006] The above technical problem is solved by the following technical scheme: the present application provides a condensate pump sealing water intelligent adjustment system, which comprises at least two sealing water supply branches, an adjustable flow control component, a manual flow control component and an anti-backflow component. Each of the sealing water supply branches is selectively connected to the water inlet end of the adjustable flow control component through the anti-backflow component, and the water outlet end of the adjustable flow control component is connected to the sealing end of the condensate pump through the manual flow control component, so as to adapt to the sealing requirements of the condensate pump in different operating stages through different sealing water supply branches.

[0007] In a preferred mode of the condensate pump sealing water intelligent adjustment system, the adjustable flow control component comprises a main pipe arranged on the side wall of the sealing water supply branch, and the side wall of the main pipe is provided with a pneumatic adjustment door.

[0008] In a preferred mode of the condensate pump sealing water intelligent adjustment system, the manual flow control component comprises a first manual gate valve arranged at the water inlet of the pneumatic adjustment door, and a second manual gate valve arranged at the pneumatic adjustment door.

[0009] In a preferred mode of the condensate pump sealing water intelligent adjustment system, the manual flow control component further comprises a branch pipe arranged on the side wall of the main pipe, and the side wall of the branch pipe is provided with a third manual gate valve.

[0010] In a preferred mode of the condensate pump sealing water intelligent adjustment system, the first manual gate valve, the second manual gate valve and the third manual gate valve are provided with a valve core inside.

[0011] In a preferred mode of the condensate pump sealing water intelligent adjustment system, the valve core comprises a flow guide net arranged in the housing of the first manual gate valve, the second manual gate valve and the third manual gate valve, and the density of the flow guide net is increased in a stepped manner.

[0012] In a preferred mode of the condensate pump sealing water intelligent adjustment system, a piston is installed inside the flow guide net, an end of the piston is provided with a connecting piece, and an end of the connecting piece is provided with an extension spring.

[0013] In a preferred mode of the condensate pump sealing water intelligent adjustment system: the end of the piston is provided with a buffer surface for guiding the water flow out from all around, wherein one end of the telescopic spring is connected with the adapter, and the other end of the telescopic spring is connected with the conical barrel.

[0014] In a preferred mode of the condensate pump sealing water intelligent adjustment system: the water flow impacts the piston to drive the telescopic spring on the adapter to compress, and increase the flow guide holes of the flow guide net.

[0015] In a preferred mode of the condensate pump sealing water intelligent adjustment system: the anti-backflow assembly comprises a first check valve and a second check valve arranged on two sealing water supply branches.

[0016] The condensate pump sealing water intelligent adjustment system has the advantages that: through the adjustable flow control assembly combined with two-stage adjustment logic, the frequent and large changes in the unit load are adapted, the core control components of the sealing water system are prevented from being damaged due to continuous pressure impact, the equipment maintenance frequency and replacement cost are reduced, and the system operation continuity is improved.

[0017] Compared with the hysteresis and randomness of the traditional manual gate valve adjustment, through the step-by-step control of the condensate main pipe pressure one-stage adjustment and the dissolved oxygen two-stage adjustment, combined with the switching of the water supply branches in different operation stages, the sealing water parameters are accurately and real-timely controlled, the dissolved oxygen fluctuation of the condensate pump outlet main pipe is effectively avoided, the corrosion of the high-dissolved-oxygen water to the subsequent pipelines, valves and thermal equipment is prevented, and the safe operation of the unit is ensured.

[0018] The condensate pump sealing water intelligent adjustment system can automatically adapt to the sealing requirements in different operation stages of the condensate pump, and does not need frequent inspection and manual operation of the operation and maintenance personnel; only when the adjustable flow control assembly is maintained, the manual gate valve is used for emergency adjustment, the labor intensity of the operation and maintenance personnel is greatly reduced, and the system operation convenience and automation level are improved.

[0019] Through the accurate control of the sealing water pressure and flow, the condensate pump sealing water intelligent adjustment system avoids excessive consumption of the sealing water and reduces unnecessary energy waste on the premise of ensuring the sealing effect, and helps the unit to realize energy-saving operation.

[0020] The condensate pump sealing water intelligent adjustment system is provided with the check valves to prevent the mixing of the media leaked from different water supply branches, and is provided with the emergency branch and the gate valve of the manual flow control assembly to form the double protection of automatic control and emergency backup, so that the condensate pump can maintain a stable sealing state in all working conditions such as starting, normal operation and equipment maintenance, and adapt to the complex operation requirements of the thermal power plant. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to make the technical solutions of the embodiments of the present application clearer, the drawings of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described in the following are only related to some embodiments of the present application, but not limit the present application. Among them: Figure 1 The system diagram of the unmodified condensate pump sealing water intelligent adjustment system is shown; Figure 2 The overall structure schematic diagram of the condensate pump sealing water intelligent adjustment system is shown; Figure 3 The valve core component split structure schematic diagram of the condensate pump sealing water intelligent adjustment system is shown. DETAILED DESCRIPTION

[0022] In order to make the technical solutions of the embodiments of the present application clearer, the drawings of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described in the following are only related to some embodiments of the present application, but not limit the present application. Among them:

[0023] The terms used in the present application are those general terms currently widely used in the art in consideration of the functions about the present application, but these terms can be changed according to the intention of the person of ordinary skill in the art, precedent or new technology in the art. In addition, specific terms can be selected by the applicant, and in this case, the detailed meaning thereof will be described in the detailed description of the present application. Therefore, the terms used in the specification should not be understood as mere names, but based on the meaning of the terms and the overall description of the present application.

[0024] Referring Figure 2 , the present embodiment provides a condensate pump sealing water intelligent adjustment system, comprising at least two sealing water supply branches 1, an adjustable flow control assembly 2, a manual flow control assembly 3 and an anti-backflow assembly 4; wherein the two sealing water supply branches 1 correspond to the condensate water source and the condensate and transport water source respectively, for adapting to the different sealing water requirements of the condensate pump 5 in the normal operation and the starting two key stages, each sealing water supply branch 1 is selectively connected to the water inlet end of the adjustable flow control assembly 2 through the anti-backflow assembly 4, and the water outlet end of the adjustable flow control assembly 2 is connected to the sealing end of the condensate pump 5 through the manual flow control assembly 3, so as to ensure that the condensate pump 5 can obtain stable and adaptive sealing water supply in the whole operation cycle by switching different sealing water supply branches 1, and avoid air leakage to cause the outlet mother pipe to increase oxygen dissolution.

[0025] The adjustable flow control assembly 2 is the core component for realizing automatic and accurate regulation of sealing water parameters, each sealing water supply branch 1 is selectively connected to the water inlet end of the adjustable flow control assembly 2 through the anti-backflow assembly 4, and the water outlet end of the adjustable flow control assembly 2 is connected to the sealing end of the condensate pump 5 through the manual flow control assembly 3, so as to adapt to the sealing requirements of the condensate pump 5 in different operation stages through different sealing water supply branches 1.

[0026] ReferringFigure 2 As an optional embodiment, the manual flow control assembly 3 has the functions of pipeline on-off control and emergency adjustment. The adjustable flow control assembly 2 comprises a main pipe 21 arranged on the side wall of the sealed water supply branch 1. The side wall of the main pipe 21 is provided with a pneumatic adjusting door 22. The main pipe 21 is used for conveying the sealing water to the sealing end of the condensate pump 5. The side wall of the main pipe 21 is provided with the pneumatic adjusting door 22. The pneumatic adjusting door 22 has two-stage adjustment function, and can be adjusted in steps based on the pressure and dissolved oxygen parameters of the outlet main pipe of the condensate pump 5, so as to meet the rapid pressure response in the working condition fluctuation and realize the fine control of the dissolved oxygen index.

[0027] With reference to Figures 2-3 In an embodiment provided in the present application, the manual flow control assembly 3 comprises a first manual gate valve 31 arranged at the water inlet of the pneumatic adjusting door 22, and a second manual gate valve 32 arranged at the water outlet of the pneumatic adjusting door 22. The manual flow control assembly 3 comprises the first manual gate valve 31 arranged at the water inlet of the pneumatic adjusting door 22, and the second manual gate valve 32 arranged at the water outlet of the pneumatic adjusting door 22. The first manual gate valve 31 and the second manual gate valve 32 are used in cooperation, so as to cut off the connection between the pneumatic adjusting door 22 and the main pipe 21 when the pneumatic adjusting door 22 needs to be repaired, and to ensure the safety of maintenance. At the same time, the manual flow control assembly 3 further comprises a branch pipe 33 arranged on the side wall of the main pipe 21. The branch pipe 33 is an emergency sealing water passage, and the side wall thereof is provided with a third manual gate valve 34. When the pneumatic adjusting door 22 is maintained, the sealing water can be temporarily conveyed through the branch pipe 33 and the third manual gate valve 34, so as to maintain the sealing state of the condensate pump 5.

[0028] The manual flow control assembly 3 further comprises the branch pipe 33 arranged on the side wall of the main pipe 21. The side wall of the branch pipe 33 is provided with the third manual gate valve 34.

[0029] The first manual gate valve 31, the second manual gate valve 32 and the third manual gate valve 34 are internally provided with a valve core 35.

[0030] The valve core 35 comprises a flow guide net 351 arranged in the housing of the first manual gate valve 31, the second manual gate valve 32 and the third manual gate valve 34. The density of the flow guide net 351 is increased in steps. The sealing water filtration and flow stabilization with different flow requirements can be adapted through different density areas.

[0031] The flow guide net 351 is internally provided with a piston 352. The end of the piston 352 is provided with a connecting piece 353. The end of the connecting piece 353 is provided with an extension spring 354.

[0032] The end of the piston 352 is provided with a buffer surface 355 for guiding the water flow to be guided out from all around, which is used to guide the water flow to be uniformly guided out from all around of the piston 352, avoiding the water flow directly impacting the inner wall of the valve body to cause pressure fluctuation, wherein one end of the telescopic spring 354 is connected with the adapter 353, and the other end of the telescopic spring 354 away from the adapter 353 is connected with the conical barrel 356. The conical barrel 356 is fixed in the gate valve shell, when the sealing water flow or pressure changes, the water flow impacts the piston 352, drives the adapter 353 to compress or stretch the telescopic spring 354, and then changes the position of the piston 352 in the flow guide net 351, increases or reduces the flow passage area of the flow guide hole of the flow guide net 351, realizes the self-adaptive adjustment of the sealing water flow, and further stabilizes the sealing water parameters delivered to the sealing end of the condensate pump 5.

[0033] The water flow impacts the piston 352, drives the telescopic spring 354 on the adapter 353 to be compressed, and increases the flow guide hole of the flow guide net 351.

[0034] With reference to Figure 2 In some embodiments, the anti-backflow assembly 4 includes a first check valve 41 and a second check valve 42 arranged on the two sealing water supply branches 1. The anti-backflow assembly 4 is used to prevent the media in the two sealing water supply branches 1 from leaking to each other, and to ensure that each branch operates independently, which specifically includes a first check valve 41 and a second check valve 42 arranged on the two sealing water supply branches 1, wherein the first check valve 41 corresponds to the condensate water supply branch, and is used to prevent the media in the condensate water supply branch from leaking reversely to the condensate water supply branch; the second check valve 42 corresponds to the condensate and transport water supply branch, and is used to prevent the media in the condensate water supply branch from leaking reversely to the condensate and transport water supply branch, avoiding the mixing of media of different water sources to affect the sealing effect, and at the same time, ensuring the sealing performance when each water supply branch is switched.

[0035] Confirming that among the two sealing water supply branches 1, the branch corresponding to the condensate water source is in a conducting state, and the branch corresponding to the condensate and transport water source is in a cut-off state; Opening the first check valve 41 in the anti-backflow assembly 4 and closing the second check valve 42, to prevent the condensate and transport water branch from leaking reversely to the condensate water branch through the first check valve 41; Opening the first manual gate valve 31 and the second manual gate valve 32 of the manual flow control assembly 3 and closing the third manual gate valve 34; at this time, the sealing water sequentially passes through the condensate water supply branch 1, the first check valve 41, and the first manual gate valve 31, and enters the main pipe 21 of the adjustable flow control assembly 2; The pneumatic adjusting door 22 of the adjustable flow control assembly 2 starts multi-stage adjustment, first one-stage adjustment based on the pressure parameter at the outlet side of the condensate pump 5, reducing the opening degree when the pressure rises, and increasing the opening degree when the pressure decreases, and then two-stage adjustment based on the dissolved oxygen parameter at the outlet side, increasing the sealing water flow when the dissolved oxygen is higher than the threshold value, and reducing the flow when the dissolved oxygen is lower than the threshold value; The sealing water is delivered to the sealing end of the condensate pump 5 through the pneumatic adjusting door 22 and the second manual gate valve 32. During the process, the valve core 35 in the first manual gate valve 31 and the second manual gate valve 32 is impacted by the water flow to drive the piston 352, which drives the connecting piece 353 to compress the telescopic spring 354, so as to adaptively adjust the size of the flow guide hole of the flow guide net 351, and stabilize the water flow output.

[0036] Switch the sealing water supply branch 1 to make the branch corresponding to the condensate water source conductive, and the branch of the condensate water source cut off; Open the second check valve 42 of the anti-backflow assembly 4, and close the first check valve 41, so as to prevent the condensate water branch from leaking reversely to the condensate water supply branch through the second check valve 42; Keep the first manual gate valve 31 and the second manual gate valve 32 of the manual flow control assembly 3 open, and keep the third manual gate valve 34 closed, so that the condensate water enters the main pipe 21 through the condensate water supply branch 1, the second check valve 41 and the first manual gate valve 31; The pneumatic adjusting door 22 preferentially adjusts the opening degree based on the dissolved oxygen parameter on the outlet side of the condensate pump 5, so as to ensure that the sealing water supply meets the sealing requirements in the starting stage, and to avoid air leakage; The sealing water is delivered to the sealing end of the condensate pump 5 through the pneumatic adjusting door 22 and the second manual gate valve 32. During the process, the valve core 35 in the first manual gate valve 31 and the second manual gate valve 32 is impacted by the water flow to drive the piston 352, which drives the connecting piece 353 to compress the telescopic spring 354, so as to adaptively adjust the size of the flow guide hole of the flow guide net 351, and stabilize the water flow output.

[0037] The adjustable flow control assembly is operated in the maintenance stage, the first manual gate valve 31 and the second manual gate valve 32 of the manual flow control assembly 3 are closed, and the access pipeline of the pneumatic adjusting door 22 is cut off, so as to ensure the safety of maintenance; The third manual gate valve 34 of the manual flow control assembly 3 is opened, so that the sealing water is directly delivered to the sealing end of the condensate pump 5 through the branch pipe 33 and the third manual gate valve 34; The opening degree of the third manual gate valve 34 is manually adjusted, and the flow guide net 351 of the valve core 35 is cooperated with the piston 352 through the ladder type density structure, so as to stabilize the flow and pressure of the sealing water, and to maintain the dissolved oxygen index on the outlet side of the condensate pump 5 to meet the requirements; After the maintenance is completed, the third manual gate valve 34 is closed, and the first manual gate valve 31 and the second manual gate valve 32 are reopened, so as to restore the automatic adjustment mode of the adjustable flow control assembly 2.

[0038] Finally, it should be pointed out that the above detailed description of the method and device is only an embodiment, and those skilled in the art can modify the embodiment in different ways without departing from the scope of the present application.

Claims

1. A condensate pump seal water intelligent adjustment system, characterized by: The utility model relates to a sealing water supply branch (1), an adjustable flow control component (2), a manual flow control component (3) and an anti-backflow component (4). Each sealing water supply branch (1) is selectively connected to the water inlet end of the adjustable flow control component (2) through the anti-backflow component (4), and the water outlet end of the adjustable flow control component (2) is connected to the sealing end of the condensate pump (5) through the manual flow control component (3) to adapt to the sealing requirements of the condensate pump (5) in different operating stages through different sealing water supply branches (1). The adjustable flow control component (2) comprises a main pipe (21) arranged on the side wall of the sealing water supply branch (1), and the side wall of the main pipe (21) is provided with a pneumatic adjusting door (22).

2. The condensate pump seal water intelligent adjustment system of claim 1, wherein: The manual flow control component (3) comprises a first manual gate valve (31) arranged at the water inlet of the pneumatic adjusting door (22) and a second manual gate valve (32) arranged at the pneumatic adjusting door (22).

3. The condensate pump seal water intelligent adjustment system of claim 2, wherein: The manual flow control component (3) further comprises a branch pipe (33) arranged on the side wall of the main pipe (21), and the side wall of the branch pipe (33) is provided with a third manual gate valve (34).

4. The condensate pump seal water intelligent adjustment system of claim 3, wherein: The first manual gate valve (31), the second manual gate valve (32) and the third manual gate valve (34) are internally provided with a valve core (35).

5. The condensate pump seal water intelligent adjustment system of claim 4, wherein: The valve core (35) comprises a flow guide net (351) arranged on the shell of the first manual gate valve (31), the second manual gate valve (32) and the third manual gate valve (34), and the density of the flow guide net (351) is increased in a stepped manner.

6. The condensate pump seal water intelligent adjustment system of claim 5, wherein: A piston (352) is arranged in the flow guide net (351), an adapter (353) is arranged at the end of the piston (352), and an elastic spring (354) is arranged at the end of the adapter (353).

7. The condensate pump seal water intelligent adjustment system of claim 6, wherein: The end of the piston (352) is provided with a buffer surface (355) for guiding the water flow to flow out from all directions, one end of the elastic spring (354) is connected to the adapter (353), and the other end of the elastic spring (354) is connected to a conical barrel (356).

8. The condensate pump seal water intelligent adjustment system of claim 7, wherein: The water flow impacts the piston (352) to drive the elastic spring (354) on the adapter (353) to be compressed, thereby increasing the flow guide holes of the flow guide net (351).

9. The condensate pump seal water intelligent adjustment system of claim 8, wherein: The anti-backflow component (4) comprises a first check valve (41) and a second check valve (42) arranged on the two sealing water supply branches (1).

10. The condensate pump seal water intelligent adjustment system of claim 9, wherein: ​

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