A condenser oxide scale detection system

Abstract

This invention discloses a condenser oxide scale detection system, belonging to the technical field of detection equipment. It includes a manifold, a water collection tank, a magnetic detector, an oxide scale separator, and a shielded vacuum pump. The manifold and water collection tank are located inside the condenser hot well. The manifold and water collection tank are connected, and the water collection tank is connected to the magnetic detector and the oxide scale separator sequentially via an outlet pipe. The solid outlet of the oxide scale separator is connected to an oxide scale discharge pipe, and the liquid outlet of the oxide scale separator is connected to the condenser hot well via a return water pipe. The shielded vacuum pump is located on the return water pipe. This invention utilizes a sampling method to directly measure the concentration of oxide scale in the liquid-solid two-phase flow in the condenser. Compared with traditional sampling methods, it eliminates the need for temperature and pressure reduction, reducing errors caused by valve interception of oxide scale. Compared with vibration wave technology, it eliminates the need for drilling holes in high-temperature, high-pressure industrial pipelines. In comparison, this invention features minimal installation and implementation difficulty, high automation, and high measurement accuracy.

Description

Technical Field

[0001] This invention belongs to the field of detection equipment technology, specifically relating to a condenser oxide scale detection system. Background Technology

[0002] In power plant boilers, the superheater or reheater, under high-temperature and high-pressure steam, produces iron corrosion products called oxide scale by reacting the metal on the inner wall of the pipes with water. As the unit operates, the oxide scale accumulates. When it reaches a critical thickness, any change in the medium temperature during operation causes stress and rupture due to the difference in expansion coefficients between the oxide scale and the metal, resulting in a gas-solid two-phase flow. This high-speed gas-solid two-phase flow enters the high-pressure cylinder of the turbine through the main steam pipeline, performs work, and then enters the hot recooling section steam pipeline. After being reheated in the boiler reheater tubes, it flows through the hot reheat section pipeline, sequentially entering the intermediate-pressure cylinder and low-pressure cylinder to perform work. After being cooled by the condenser, it forms a liquid-solid two-phase flow that enters the hot well. In the hot well, the oxide scale deposits at the bottom, and the condensate re-enters the steam-water circulation system.

[0003] In the steam-water circulation system, the determination of scale concentration has always been a challenge in the online analysis of steam-water quality in the power industry, and there is currently no specific standard. However, there are two main methods for determination: one is the high-temperature sampling method; the other is the direct measurement method.

[0004] A commonly used online high-temperature sampling method involves extracting a gas-solid two-phase flow from the main steam or reheat steam pipeline, cooling and depressurizing it, and then detecting the particulate matter concentration in the liquid-solid two-phase flow. However, the accuracy of this method is affected by factors such as the unavoidable solid particle interception during sampling in a high-temperature, high-pressure gas-solid two-phase flow environment due to depressurization, and variations in the concentration of solid particles in the gas-solid two-phase flow at the sampling location. The results are often primarily qualitative. This method also suffers from drawbacks such as long sampling pipelines, complex installation, and the interception of solid particles in the gas-solid two-phase flow by depressurization valves.

[0005] To overcome the shortcomings of online high-temperature sampling methods, a direct vibration wave measurement method based on the physical principle of mass-energy conversion has been proposed. Solid particles impact a wedge-shaped probe inserted into the inner wall of the main steam or reheat steam pipeline; the kinetic energy value is only related to the particle's mass and velocity. The concentration of solid particles in the gas-solid two-phase flow is obtained by monitoring the vibration of the probe. The advantages are a simple monitoring system, no long sampling pipeline, and no solid particle interception problem caused by high-temperature decompression. However, the wedge probe requires openings in the high-temperature steam pipeline, making construction difficult. Another impact vibration wave detection technology based on the physical principle of mass-energy conversion measures the vibration waves generated by solid particles impacting a wedge-shaped probe inserted into the inner wall of a high-temperature pipeline to obtain the concentration of solid particles in the gas-solid two-phase flow. It has advantages such as system simplicity and rapid response. However, the installation of the wedge probe requires additional openings in the high-temperature steam pipeline, making construction difficult; furthermore, its vibration wave measurement method is contact-based, requiring the vibration sensing element to operate at high temperatures. Summary of the Invention

[0006] To address the shortcomings of the prior art, the present invention aims to provide a condenser oxide scale detection system that is easy to install and implement, and has high measurement accuracy.

[0007] This invention is achieved through the following technical solution:

[0008] This invention discloses a condenser scale detection system, comprising a manifold, a water collection tank, a magnetic detector, a scale separator, and a shielded vacuum pump. The manifold and water collection tank are located inside the condenser hot well. The manifold and water collection tank are connected, and the water collection tank is connected to the magnetic detector and the scale separator in sequence through a water outlet pipe. The solid outlet of the scale separator is connected to a scale discharge pipe, and the liquid outlet of the scale separator is connected to the condenser hot well through a return water pipe. The shielded vacuum pump is located on the return water pipe.

[0009] Preferably, the manifold is fixed in the upper part of the condenser hot well and located below the condenser heat exchange tubes; the water collection tank is fixed in the bottom of the condenser hot well.

[0010] Preferably, the number of manifolds is ≥2.

[0011] More preferably, all manifolds are installed at the same height.

[0012] More preferably, all manifolds are arranged at equal and uniform intervals.

[0013] Preferably, a primary and secondary water outlet isolation valve is provided between the water collection tank and the magnetic detector.

[0014] Preferably, the oxide scale discharge pipe is equipped with a primary and secondary oxide scale discharge valve.

[0015] Preferably, the return water pipe is equipped with a flow meter and a pressure gauge.

[0016] Preferably, a check valve is provided on the return water pipe.

[0017] Preferably, the return water pipe is equipped with a return water isolation primary and secondary valve.

[0018] Compared with the prior art, the present invention has the following beneficial technical effects:

[0019] This invention discloses a condenser oxide scale detection system that directly measures the concentration of oxide scale in the liquid-solid two-phase flow within the condenser using a sampling method. Compared to traditional sampling methods, this system eliminates the need for temperature and pressure reduction, thus reducing errors caused by oxide scale interception at valves. Furthermore, compared to vibration wave technology, it eliminates the need for drilling holes in high-temperature, high-pressure industrial pipelines. In comparison, this invention offers advantages such as minimal installation and implementation difficulty, high automation, and high measurement accuracy.

[0020] Furthermore, having ≥2 manifolds allows for the acquisition of representative samples within a limited space.

[0021] Furthermore, all manifolds are installed at the same height to avoid flow deviation caused by height differences.

[0022] Furthermore, in order to prevent vacuum disruption that may occur when sample water is discharged to the outside of the condenser, a primary and secondary water isolation valve is installed on the sample water discharge pipe.

[0023] Furthermore, the oxide scale discharge pipe is equipped with primary and secondary oxide scale discharge valves to prevent condenser vacuum damage caused by oxide scale erosion.

[0024] Furthermore, the return water pipe is equipped with a flow meter and a pressure gauge, which can monitor the flow and pressure in the system in real time, ensuring the safe and stable operation of the system.

[0025] Furthermore, a check valve is installed on the return water pipe to prevent condenser vacuum damage caused by a sudden power outage during operation.

[0026] Furthermore, the return water pipe is equipped with a return water isolation primary and secondary valve, which can effectively maintain the system vacuum during equipment shutdown. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall system configuration of the present invention.

[0028] In the diagram: 1 is the manifold, 2 is the water collection tank, 3 is the outlet water isolation primary and secondary valves, 4 is the magnetic detector, 5 is the oxide scale separator, 6 is the oxide scale discharge primary and secondary valves, 7 is the shielded vacuum pump, 8 is the flow meter, 9 is the pressure gauge, 10 is the check valve, and 11 is the return water isolation primary and secondary valves. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. This description is intended to explain the invention and not to limit it.

[0030] like Figure 1 The condenser scale detection system of the present invention includes a manifold 1, a water collection tank 2, a magnetic detector 4, a scale separator 5, and a shielded vacuum pump 7. The manifold 1 and the water collection tank 2 are located inside the condenser hot well. The manifold 1 is connected to the water collection tank 2. The water collection tank 2 is connected to the magnetic detector 4 and the scale separator 5 in sequence through a water outlet pipe. The solid outlet of the scale separator 5 is connected to a scale discharge pipe, and the liquid outlet of the scale separator 5 is connected to the condenser hot well through a return water pipe. The shielded vacuum pump 7 is located on the return water pipe.

[0031] In a preferred embodiment of the present invention, the manifold 1 is fixed in the upper part of the condenser hot well and located below the condenser heat exchange tube; the water collection tank 2 is fixed in the bottom of the condenser hot well.

[0032] In a preferred embodiment of the present invention, the number of manifolds 1 is ≥2. Preferably, all manifolds 1 have the same installation height. Preferably, all manifolds 1 are arranged at equal intervals.

[0033] In a preferred embodiment of the present invention, a water outlet isolation primary and secondary valve 3 is provided between the water collection tank 2 and the magnetic detector 4.

[0034] In a preferred embodiment of the present invention, an oxide scale discharge primary and secondary valve 6 is provided on the oxide scale discharge pipe.

[0035] In a preferred embodiment of the present invention, a flow meter 8 and a pressure gauge 9 are provided on the return water pipe.

[0036] In a preferred embodiment of the present invention, a check valve 10 is provided on the return water pipe.

[0037] In a preferred embodiment of the present invention, a return water isolation primary and secondary valve 11 is provided on the return water pipe.

[0038] The working principle of the present invention will be further explained below with reference to a specific embodiment:

[0039] The manifold 1 and the water collection tank 2, along with their connecting pipes, are installed inside the condenser hot well. The manifold 1 is fixed below the condenser heat exchange tubes, and usually two or more can be installed at the same height, evenly distributed in the upper part of the condenser hot well. The collected liquid-solid two-phase flow sample is collected in the water collection tank 2 fixed at the bottom of the condenser hot well through the pipes and then vertically exits through the condenser bottom plate and is discharged outside the condenser.

[0040] To prevent potential vacuum disruption when sample water is discharged outside the condenser, a primary and secondary water isolation valve 3 is installed on the sample water discharge pipe before it enters the magnetic detector 4. When there is oxide scale in the sample water, the induction coil of the magnetic detector 4 can detect the change in electrical signal caused by the change in oxide scale concentration.

[0041] After the sample water flows out of the magnetic detector 4, it first enters the oxide scale separator 5, where gravity and magnetic force are used to separate the oxide scale and condensate. The separated oxide scale particles are discharged out of the system through the oxide scale discharge primary and secondary valves 6. The separated condensate is lifted by the shielded vacuum pump 7 and flows through the flow meter 8, pressure gauge 9, check valve 10 and return water isolation primary and secondary valves 11 on the outlet pipe in sequence, returning to the upper part of the condenser hot well.

[0042] The above description is only a part of the embodiments of the present invention. Although some terms are used in the present invention, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of the present invention, and interpreting them as any kind of additional limitation would contradict the spirit of the present invention. The above description is only to further illustrate the content of the present invention through embodiments to facilitate easier understanding, but it does not mean that the embodiments of the present invention are limited to this. Any technical extension or re-creation based on the present invention is protected by the present invention.

Claims

1. A condenser scale detection system, characterized by, The system comprises a collecting groove (1), a collecting tank (2), a magnetic detector (4), a scale separator (5) and a shielded vacuum pump (7); the collecting groove (1) and the collecting tank (2) are arranged in the condenser hot well, the collecting groove (1) is connected with the collecting tank (2), the collecting tank (2) is connected with the magnetic detector (4) and the scale separator (5) in sequence through a water outlet pipe, the solid outlet of the scale separator (5) is connected with a scale discharge pipe, the liquid outlet of the scale separator (5) is connected with the condenser hot well through a backwater pipe, and the shielded vacuum pump (7) is arranged on the backwater pipe. The collecting groove (1) is fixed to the upper portion in the condenser hot well and is located below the condenser heat exchange pipe, the collecting tank (2) is fixed to the bottom portion in the condenser hot well, the number of the collecting grooves (1) is greater than or equal to 2, the installation heights of all the collecting grooves (1) are the same, and all the collecting grooves (1) are arranged at equal distances.

2. The condenser scale detection system according to claim 1, characterized in that, A water outlet isolation primary and secondary valve (3) is arranged between the collecting tank (2) and the magnetic detector (4).

3. The condenser scale detection system according to claim 1, characterized in that, A scale discharge primary and secondary valve (6) is arranged on the scale discharge pipe.

4. The condenser scale detection system according to claim 1, characterized in that, A flowmeter (8) and a pressure gauge (9) are arranged on the backwater pipe.

5. The condenser scale detection system according to claim 1, characterized in that, A check valve (10) is arranged on the backwater pipe.

6. The condenser scale detection system according to claim 1, characterized in that, A backwater isolation primary and secondary valve (11) is arranged on the backwater pipe.

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