Protection device for reducing starting frequency of centrifugal drainage pump
By designing a protective device, using the backflow valve to control the condensation liquid of the water -sparse pump output to the water dredging tank, solving the problem of damaging the centrifugal hydrophobic pump due to multiple frequency startup, realizing the continuous operation of the water dredging pump and the stable operation of the system. , Reduce energy waste.
Patent Information
- Application Number
- CN202323484932.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-20
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2033-12-20
AI Technical Summary
The centrifugal hydrophobic pump is damaged due to repeated and long-term startups for multiple times, resulting in the turbine shutdown and the continuous flow system operation is interrupted, resulting in huge waste.
Design a protective device that sets up two -way pipeline and return valve by parallel to control the condensate liquid at the output of the water sparse pump to the hydrophobic tank to maintain the stability of the liquid level and reduce the starting frequency of the pump.
The continuous operation of the water dredging pump is reduced, the frequency of the monthly startup is reduced, thereby extending the service life of the pump, avoiding system interruption and equipment damage, and reducing energy waste.
Smart Images
Figure CN222415277U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of protection of centrifugal drain pumps for air-cooled condensers, in particular to a protection device for reducing the starting frequency of the centrifugal drain pumps. Background Art
[0002] The steam driven by the condensing steam turbine becomes exhaust steam after it is done. After the exhaust steam condenses into condensate, its volume shrinks sharply, the pressure decreases, and a vacuum is formed. The non-condensable gas is extracted by the vacuum pump to maintain the vacuum stability. There are two ways to condense the exhaust steam, namely water cooling and air cooling. Since the evaporation of cooling water is large and the energy consumption is high during the operation of the water cooling method, air cooling is often used to condense the exhaust steam in areas with water shortages.
[0003] The air-cooled condensing system has a long distance between the exhaust port and the condenser, and the exhaust pipe has a large diameter and a long length. In order to promptly remove the condensed liquid inside the exhaust pipe to prevent the condensed liquid from flowing with the air flow and causing liquid shock to damage the pipe and equipment, a drain tank is installed at the bottom of the exhaust pipeline to collect the condensed liquid. The condensed liquid collected in the drain tank is pressurized by two centrifugal drain pumps, one for use and one for backup, and then sent to the condensate tank storage tank, and then sent out of the boundary area by the condensate pump.
[0004] The drain pump automatically starts when the liquid level in the drain tank rises to 65%, and automatically stops when it drops to 30%. Limited by the amount of condensation and the volume of the drain tank, the drain pump needs to be started every 15 minutes, and run for 5 minutes after each start and stop. It needs to be started 3 times per hour and this starting frequency must be maintained for a long time. Repeated starts cause irreversible damage to the motor, control cabinet, coupling, and pump rotor, which accumulates and greatly reduces the service life of the drain pump. Sudden failures often occur during operation. Repairing and replacing the drain pump itself will cause economic losses. In addition, when the drain pump fails, the condensate in the drain tank cannot be discharged in time, and the damage to the pipeline and equipment by the condensate is extremely serious. Even if there is liquid level interlocking shutdown protection, this shutdown is often accompanied by great waste. Summary of the invention
[0005] In order to overcome the defects of the above existing technologies, the purpose of the utility model is to provide a protection device for reducing the starting frequency of centrifugal drain pumps, which allows the drain pumps to run continuously without interruption, and is switched once a month, which greatly improves the operating stability and has significant economic benefits. It solves the problem that the drain pumps of the air-cooled condensing system of the steam turbine of chemical and power enterprises are damaged due to repeated long-term and high-frequency starting, which causes the turbine to shut down, the continuous flow system to be interrupted, and great waste is generated.
[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0007] A protection device for reducing the startup frequency of a centrifugal drain pump comprises two pipelines arranged in parallel, a drain pump 1 and a drain pump 2 are arranged on the pipelines respectively, the output ends of the drain pump 1 and the drain pump 2 are connected to the input end of the external delivery main valve through a pipeline after the output ends of the drain pump 1 and the drain pump 2 are merged, a branch is led on the pipeline for connecting to a drain tank, a reflux valve is arranged on the branch, and the output end of the drain tank is connected to the input end of the drain pump 1 and the drain pump 2 respectively;
[0008] A front cut-off valve is provided at the inlet end of the reflux valve, and a rear cut-off valve is provided at the outlet end;
[0009] The front and rear ends of the drain pump 1 and the drain pump 2 are respectively provided with an inlet valve and an outlet valve.
[0010] Beneficial effects of the utility model:
[0011] The utility model controls the opening of the reflux valve to return part of the condensate from the drain tank to the drain tank before it is sent out by the drain pump, which not only ensures that the condensate generated by the system can be sent out in time, but also maintains the stability of the liquid level in the drain tank, so that the drain pump can run continuously, and the starting frequency of the drain pump is reduced from thousands of times per month to once a month, which greatly guarantees the service life of the drain pump, eliminates the risk of system interruption and equipment and pipeline damage caused by drain pump failure, ensures the continuous and stable operation of the system, reduces the energy waste in the process of starting and stopping after the system is interrupted, and the damage to the equipment itself caused by the start and stop of the equipment, thereby generating economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION
[0013] The utility model is further described in detail below in conjunction with the accompanying drawings.
[0014] like Figure 1 As shown: a protection device for reducing the starting frequency of a centrifugal drain pump, comprising two drain pumps 1, a drain pump 2, a reflux valve 3, a front cut-off valve 4, a rear cut-off valve 5, a drain tank 6, a drain pump outlet main valve 7 and connecting pipes.
[0015] By adjusting the opening of the reflux valve 3, the reflux amount of the condensate from the outlets of the drain pump 1 and the drain pump 2 to the drain tank 6 is controlled, thereby maintaining the liquid level of the drain tank 6 stable, avoiding the pump from starting automatically when the liquid level is low and stopping automatically when the liquid level is high. The front cut-off valve 4 and the rear cut-off valve 5 are used to close the front cut-off valve 4 and the rear cut-off valve 5 when the reflux valve 3 fails, thereby realizing the online maintenance of the reflux valve 3.
[0016] Drain pump 1 and drain pump 2 are respectively provided with inlet and outlet valves, which are used to cut out for online maintenance in case of failure of one pump. After drain pump 1 or drain pump 2 is started, the front cut-off valve 4 and the rear cut-off valve 5 of the reflux valve 3 are fully opened, and the opening of the reflux valve 3 is adjusted according to the liquid level of the drain tank 6. When the liquid level of the drain tank 6 decreases, the reflux valve 3 is opened, and when the liquid level increases, the reflux valve 3 is closed, so as to maintain the liquid level of the drain tank 6 stable at about 56%, to avoid the automatic stop of drain pump 1 and drain pump 2 due to the liquid level below 30%, and the automatic start of drain pump 1 and drain pump 2 when the liquid level is higher than 70%, and finally realize the continuous operation of drain pump 1 or drain pump 2 without interruption. Drain pump 1 and drain pump 2 are switched once a month, and each pump runs continuously for 1 month.
[0017] The working principle of this utility model:
[0018] The condensate from the drain tank 6 is partially refluxed to the drain tank 6 through the reflux valve 3 before being sent out by the drain pump 1 and the drain pump 2, which not only ensures that the condensate generated by the system can be sent out in time, but also maintains the stability of the liquid level in the drain tank 6, so that the drain pump can operate continuously.
Claims
1. A protection device for reducing the starting frequency of a centrifugal drain pump, characterized in that: The invention comprises two pipelines arranged in parallel, wherein a drain pump 1 (1) and a drain pump 2 (2) are arranged on the pipelines respectively, and after the output ends of the drain pump 1 (1) and the drain pump 2 (2) are merged, they are connected to the input end of the external delivery main valve (7) through a pipeline, and a branch line is led on the pipeline for connecting to a drain tank (6), and a reflux valve (3) is arranged on the branch line, and the output end of the drain tank (6) is connected to the input end of the drain pump 1 (1) and the drain pump 2 (2) respectively; A front cut-off valve (4) is provided at the inlet end of the reflux valve (3), and a rear cut-off valve (5) is provided at the outlet end; The front and rear ends of the drain pump 1 (1) and the drain pump 2 (2) are respectively provided with an inlet valve and an outlet valve.