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A heat exchanger fault diagnosis system and method based on temperature and pressure signal monitoring

A fault diagnosis system and pressure signal technology, applied in the direction of instruments, measuring devices, machine/structural component testing, etc., can solve problems such as poor accuracy of fault diagnosis

Active Publication Date: 2017-02-08
严格集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a heat exchanger fault diagnosis system and method based on temperature and pressure signal monitoring to solve the problem of existing heat exchanger fault diagnosis technology that needs to measure the flow rate of the heat exchange working medium, or rely on the heat exchange of the heat exchanger The problem of poor fault diagnosis accuracy due to the empirical formula of resistance characteristics

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  • A heat exchanger fault diagnosis system and method based on temperature and pressure signal monitoring
  • A heat exchanger fault diagnosis system and method based on temperature and pressure signal monitoring
  • A heat exchanger fault diagnosis system and method based on temperature and pressure signal monitoring

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specific Embodiment approach 1

[0240] Specific implementation mode one: combine figure 1 Describe this embodiment, the structure of a heat exchanger fault diagnosis system based on temperature and pressure signal monitoring described in this embodiment is that a temperature sensor 3 and a pressure sensor 7 are arranged on the heat exchange medium-inlet pipe of the heat exchanger 15 and the pressure sensor 11 (the distance between the pressure sensor 7 and the pressure sensor 11 needs to ensure that the pressure difference between the two is relatively obvious, reaching more than 10 times the measurement error of the pressure gauge), and the outlet pipeline is provided with a temperature sensor 4 , pressure sensor 8. A temperature sensor 6 and a pressure sensor 10 are arranged on the heat exchange medium inlet pipe of the heat exchanger, and a temperature sensor 5 and a pressure sensor 9 are arranged on the outlet pipe. The 4 temperature sensors and 5 pressure sensors are connected with the fault diagnostic ...

specific Embodiment approach 2

[0299] Specific implementation mode two: combination figure 2 This embodiment is described. The difference between this embodiment and the first embodiment is that a resistance standard 13 is provided between the pressure sensor 11 and the pressure sensor 7 . In the first embodiment, in order to ensure that the pressure difference between the pressure sensor 11 and the pressure sensor 7 is relatively obvious, the distance between the two pressure sensors is generally required to be relatively long, which is difficult to achieve in some actual situations, and the data sensing The wires are also longer, which is a disadvantage. After the resistance standard part 13 is set, the two pressure sensors can be arranged closer together, and the data lines are also shorter. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0300] Specific implementation mode three: combination image 3 This embodiment is described. The difference between this embodiment and the first embodiment is that a pressure sensor 12 is provided downstream of the pressure sensor 9 at the outlet of the heat exchange medium two. Simultaneously:

[0301] 1. Modify the formula for calculating the pressure difference outside the heat exchange medium 2 under the condition of no failure:

[0302] ΔP s2(k) =P 9(k) -P 12(k) (1≤k≤M)

[0303] 2. Modify the formula for calculating the external pressure difference of heat exchange medium 2 under actual operating conditions as:

[0304] ΔP s2 =P 9 -P 12

[0305] 3. Modify the selected ΔP s1(i) and ΔP s2(k) As the identification parameter of (i, k) working condition. That is, when querying the fault-free working conditions corresponding to the actual operating conditions, firstly, in the data sequence ΔP s1(i) The external pressure difference data ΔP found in the actual oper...

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Abstract

The invention discloses a heat exchanger fault diagnosis system and method based on temperature and pressure signal monitoring, belongs to the technical field of the running fault diagnosis of a heat exchanger, and solves the problem that the fault diagnosis accuracy is poor because the heat exchange working medium flow is needed to be monitored in the current heat exchanger fault diagnosis method. The temperature signal output end of a temperature sensor and the pressure signal output end of a pressure sensor are respectively connected with the corresponding signal interfaces of a fault diagnotor which is used for receiving, storing, computing and processing, displaying data and fault diagnosis alarm. According to the method, the rated flow range of a first heat exchange medium of the heat exchanger is divided into N internals; the rated flow range of a second heat exchange medium of the heat exchanger is divided into M internals; temperature and pressure parameters under the condition of the heat exchanger without any fault are computed and processed to be stored as a feature parameter of the heat exchanger in the fault diagnotor; the fault diagnotor carries out processing according to the real-time running data which are transmitted by the temperature sensor and the pressure sensor and computes a specific value of the corresponding data under the condition of no fault so as to judge whether the heat exchanger has a fault or not; and the method is used for the on-line fault diagnosis of the heat exchanger.

Description

technical field [0001] The invention relates to a system and method for online diagnosis of heat exchanger operation faults. The invention belongs to the technical field of heat exchanger operation fault diagnosis, and in particular relates to an online diagnosis of heat exchanger operation faults without measuring the flow rate of heat exchange working fluid. Systems and methods for diagnosis. [0002] technical background [0003] Heat exchangers are widely used in industrial production and national life, and their efficient and reliable operation has a vital impact on the economic benefits of these industries. However, faults such as fouling, clogging, and leakage of the heat exchanger are common problems in the actual operation of the heat exchanger and need to be solved. According to surveys, more than 90% of heat exchangers have problems of fouling, clogging and leakage. Due to the existence of these problems, the heat transfer coefficient of the heat exchanger is red...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M99/00
Inventor 张承虎林春光孙德兴
Owner 严格集团股份有限公司