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Protection system for preventing excessive pressure of condensate pump inlet, and operation method

A technology of condensate pump and protection system, which is used in pipeline systems, mechanical equipment, gas/liquid distribution and storage, etc., can solve problems such as overpressure damage to the inlet pipeline of the condensate pump, and can prevent overpressure damage to the inlet pipeline and avoid overpressure. damage, the effect of ensuring continuity and effectiveness

Inactive Publication Date: 2019-09-06
大唐郓城发电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the unit is running, the pressure of the condensate pipe is relatively high (about 2MPa). If the outlet valve and check valve of the condensate pump are not closed tightly, the inlet pipe of the condensate pump may be damaged by overpressure during the isolation process.

Method used

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  • Protection system for preventing excessive pressure of condensate pump inlet, and operation method
  • Protection system for preventing excessive pressure of condensate pump inlet, and operation method
  • Protection system for preventing excessive pressure of condensate pump inlet, and operation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 As shown, a protection system for preventing overpressure at the inlet of the condensate pump includes a condenser 1 and a condensate pump 4 connected by pipelines, and the pipeline between the outlet end of the condenser 1 and the inlet end of the condensate pump 4 An inlet valve A2 is provided, the outlet end of the condensate pump 4 is connected to the deaerator through a pipeline, and the pipeline between the outlet end of the condensate pump 4 and the deaerator is sequentially provided with a check valve A5 and an outlet valve A8 , the pipeline between the check valve A5 and the outlet valve A8 is sequentially provided with a pressure gauge A6 and a bypass pipeline A, and the bypass pipeline A is provided with a drain valve A7; the condenser 1 and A standby condensate pump 11 is also connected in parallel between the deaerators. An inlet valve B9 is arranged on the pipeline between the outlet end of the condenser 1 and the inlet end of the standby ...

Embodiment 2

[0038] Such as figure 2 As shown, the system structure of this embodiment is the same as that of Embodiment 1, but on the route of the standby condensate pump 11, a pressure gauge B13 and a bypass pipe B are provided on the pipeline between the check valve B12 and the outlet valve B15, The bypass pipe B is provided with a drain valve B14.

[0039] When the standby condensate pump 11 also fails, the standby condensate pump 11 is isolated according to the following operation method:

[0040] (1) When the standby condensate pump 11 also fails, close the outlet valve B15 of the standby condensate pump 11, and stop the standby condensate pump 11;

[0041] (2) Observe whether the standby condensate pump 11 can stop completely. If it reverses, it indicates that the outlet valve B15 and check valve B12 of the standby condensate pump 11 are not closed tightly, and the isolation operation of the standby condensate pump 11 cannot be performed. Check and overhaul the outlet valve B15 a...

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Abstract

The invention belongs to the technical field of thermal power generation, relates to a condensate pump maintenance and isolation operation technology for thermal power plants, and particularly relatesto a protection system for preventing the excessive pressure of a condensate pump inlet, and an operation method. According to the protection system for preventing the excessive pressure of the condensate pump inlet provided by the invention, a standby condensate pump is connected in parallel, so that when the condensate pump encounters a failure, the standby condensate pump can operate continuously, and the continuity and the effectiveness of operation are ensured; the condensate pump and the standby condensate pump are provided with protection systems, so that the accurate isolation operation can be realized, and the occurrence of the phenomenon that an inlet pipe is damaged due to the excessive pressure is avoided; and by applying the protection system and the operation method providedby the invention, whether an outlet valve A and a check valve A of the condensate pump or an outlet valve B and a check valve B of the standby condensate pump are tightly closed or not can be judged,so that the occurrence of the phenomenon that the inlet pipe is damaged due to the excessive pressure in the condensate pump or standby condensate pump isolating process can be effectively prevented.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, and relates to the maintenance and isolation operation technology of a condensate pump used in a thermal power plant, in particular to a protection system and an operation method for preventing overpressure at the inlet of a condensate pump. Background technique [0002] The condensate pump used in thermal power plants is an important auxiliary machine for power generation. Its main function is to boost the water in the condenser and send it to the deaerator through the low-pressure heater. The inlet pressure is designed, and the normal operating pressure is generally about 2Mpa; the pressure bearing capacity of the inlet pipeline is designed according to 0.1Mpa, and the actual operating pressure is the condenser pressure (-90kPa). [0003] During the production process of a thermal power plant, there may be failures of the condensate pump, blockage of the inlet filter, etc., and...

Claims

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Application Information

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IPC IPC(8): F17D1/14F17D3/01
CPCF17D1/14F17D3/01
Inventor 王开晶
Owner 大唐郓城发电有限公司