WO2025007650A1 - 一种换热系统管道水垢在线监测方法及系统 - Google Patents

一种换热系统管道水垢在线监测方法及系统 Download PDF

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Publication number
WO2025007650A1
WO2025007650A1 PCT/CN2024/093014 CN2024093014W WO2025007650A1 WO 2025007650 A1 WO2025007650 A1 WO 2025007650A1 CN 2024093014 W CN2024093014 W CN 2024093014W WO 2025007650 A1 WO2025007650 A1 WO 2025007650A1
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flow velocity
pipeline
scale
monitoring
monitoring point
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English (en)
French (fr)
Inventor
张世明
裴海林
马优
汪俊波
陈少华
南江
程帅
夏绍云
孙改兰
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Xian Thermal Power Research Institute Co Ltd
Huaneng Laiwu Power Generation Co Ltd
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Xian Thermal Power Research Institute Co Ltd
Huaneng Laiwu Power Generation Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
    • G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft

Definitions

  • the present application belongs to the technical field of scale monitoring, and specifically relates to an online monitoring method and system for scale in pipelines of a heat exchange system.
  • scale insoluble, poorly soluble and slightly soluble substances
  • the formation of scale generally goes through a process of nucleation and growth. First, a few scale cores are formed and attached to the surface of the pipeline, and then more other scale-forming compounds gather around these cores to form larger scale groups, which affect the flow rate and flow of the fluid in the pipeline, and even block the pipeline in severe cases.
  • the monitoring of scale in the pipelines of the heat exchange system of power stations mainly adopts the on-site monitoring method and the laboratory scale inhibition determination method.
  • the laboratory scale inhibition determination method is mainly used for theoretical research and cannot obtain the actual structural conditions.
  • the on-site monitoring method mainly adopts the monitoring heat exchanger method, which is to disassemble the monitoring heat exchanger after a certain period of operation, cut open its heat exchange tubes, observe the deposition of sediments, determine the thickness of the precipitated sediment layer, and then use the monitoring heat exchanger to determine the thermal resistance value of the scale in the cooling water system, predict or judge the degree of sediment deposition in the heat exchanger.
  • This method cannot realize online monitoring and the implementation means are relatively complicated.
  • the purpose of this application is to provide a heat exchange system pipeline scale online monitoring method and system, which is simple to implement and has a high degree of automation, can monitor the scale thickness in the pipeline in real time, quantitatively calculate the scale thickness, and issue an alarm in time, which can guide daily Regular anti-scaling and subsequent descaling work ensures the safe and stable operation of the power station.
  • the present application discloses an online monitoring method for scale in a heat exchange system pipeline, comprising:
  • S1 Determine several monitoring points along the length direction of the pipeline, obtain the flow velocity in the pipeline at each monitoring point, and obtain the flow velocity at the pipeline inlet at the same time;
  • S3 The scale thickness is calculated based on the flow velocity at the abnormal monitoring point and the flow velocity at the pipeline inlet. If the scale thickness exceeds a preset scale thickness alarm threshold, an alarm is issued.
  • step S1 the number of monitoring points is ⁇ 3.
  • step S1 a plurality of monitoring points are distributed at equal distances.
  • step S1 on the straight pipe section, the distance between a plurality of monitoring points is ⁇ 1.5 m.
  • step S1 on the curved pipe section, the distance between a plurality of monitoring points is ⁇ 1 m.
  • step S1 the distance between the monitoring point and the pipeline inlet is ⁇ 1m.
  • step S1 the flow velocity at the pipeline inlet and the flow velocity at the monitoring point are obtained by an ultrasonic Doppler flow velocity detector.
  • step S3 the scale thickness d at the abnormal monitoring point is calculated by the following formula:
  • V1 is the flow velocity at the pipeline inlet
  • V2 is the flow velocity at the abnormal monitoring point
  • the system disclosed in the present application for realizing the above-mentioned heat exchange system pipeline scale online monitoring method comprises a pipeline port flow velocity acquisition unit, a flow velocity comparison unit, a scale thickness calculation unit, an alarm unit, a scale thickness comparison unit and a plurality of monitoring point flow velocity acquisition units;
  • a pipeline inlet flow velocity acquisition unit which acquires the flow velocity at the pipeline inlet and sends it to the flow velocity comparison unit;
  • a flow rate comparison unit compares the flow rate in the pipeline at each monitoring point with the flow rate at the pipeline inlet, and determines the monitoring point whose flow rate exceeds the flow rate deviation threshold as an abnormal monitoring point;
  • a scale thickness calculation unit calculates the scale thickness according to the flow velocity at the abnormal monitoring point and the flow velocity at the pipeline inlet, and sends the scale thickness calculation result to the scale thickness comparison unit;
  • the scale thickness comparison unit compares the scale thickness calculation result with the preset scale thickness alarm threshold, and sends an alarm instruction to the alarm unit if the scale thickness exceeds the preset scale thickness alarm threshold;
  • the alarm unit receives the alarm instruction from the scale thickness comparison unit and sends an alarm.
  • the method for monitoring scale in the pipeline of a heat exchange system disclosed in the present application monitors the flow rate in the pipeline in real time online by setting several monitoring points on the pipeline, and compares the flow rate at the pipeline inlet at the same time as a benchmark.
  • scale is not easy to form at the pipeline inlet; when scale exists on the inner wall of the pipeline, the flow area at that place will be reduced, and the corresponding flow rate will be increased. If the flow rate at the monitoring point exceeds the set flow rate deviation threshold, the monitoring point will be used as an abnormal monitoring point; the scale in the pipeline can usually be approximated as a ring that is close to the inner wall of the pipeline, so the scale thickness can be further quantitatively calculated.
  • the present application is simple to implement and has a high degree of automation. It can monitor the scale thickness in the pipeline in real time, quantitatively calculate the scale thickness, and issue an alarm in time. It can guide daily anti-scaling and subsequent descaling work to ensure the safe and stable operation of the power station.
  • the number of monitoring points is ⁇ 3, and the pipeline can be monitored at multiple points and in sections, thereby improving the accuracy of the monitoring results and positions.
  • monitoring points are distributed at equal distances to improve the comparability of flow velocity data between the monitoring points and improve the accuracy of the monitoring results.
  • the distance between several monitoring points is ⁇ 1.5m. If the distance is too small, the flow velocity is approximately unchanged, and setting monitoring points too densely will increase the cost. At the same time, since the length of the curved pipe section is short, the distance between several monitoring points on the curved pipe section is ⁇ 1m.
  • the distance between the monitoring point and the pipeline inlet is ⁇ 1m. If the distance is too small, the monitored value will not change much.
  • the system disclosed in the present application for realizing the above-mentioned method for online monitoring of scale in pipes of the heat exchange system is simple to construct, is well compatible with the existing heat exchange system, and can be applied to new power stations and the renovation of existing power stations.
  • FIG1 is a schematic diagram of the method flow of the present application.
  • FIG. 2 is a schematic diagram of the monitoring point setting of the present application.
  • the online monitoring method for scale in the heat exchange system pipeline of the present application includes:
  • S1 Determine several monitoring points along the length direction of the pipeline, obtain the flow velocity in the pipeline at each monitoring point, and obtain the flow velocity at the pipeline inlet at the same time;
  • S3 The scale thickness is calculated based on the flow velocity at the abnormal monitoring point and the flow velocity at the pipeline inlet. If the scale thickness exceeds a preset scale thickness alarm threshold, an alarm is issued.
  • the scale thickness alarm threshold is usually set based on a comprehensive consideration of equipment type, pipe material, and pipe diameter.
  • step S1 the number of monitoring points is ⁇ 3.
  • step S1 a plurality of monitoring points are distributed at equal distances.
  • step S1 on the straight pipe section, the distance between a plurality of monitoring points is ⁇ 1.5 m.
  • step S1 the distance between a plurality of monitoring points on the curved pipe section is ⁇ 1 m.
  • the distance between the monitoring point and the pipeline inlet is ⁇ 1m.
  • step S1 several monitoring points are set in the same category.
  • the pipe type here refers to straight pipe or curved pipe.
  • step S1 the flow velocity at the pipeline inlet and the flow velocity at the monitoring point are obtained by an ultrasonic Doppler flow velocity detector.
  • step S3 the scale thickness d at the abnormal monitoring point is calculated by the following formula:
  • V1 is the flow velocity at the pipeline inlet
  • V2 is the flow velocity at the abnormal monitoring point
  • It includes a pipeline outlet flow velocity acquisition unit, a flow velocity comparison unit, a scale thickness calculation unit, an alarm unit, a scale thickness comparison unit and a plurality of monitoring point flow velocity acquisition units;
  • a pipeline inlet flow velocity acquisition unit which acquires the flow velocity at the pipeline inlet and sends it to the flow velocity comparison unit;
  • a flow rate comparison unit compares the flow rate in the pipeline at each monitoring point with the flow rate at the pipeline inlet, and determines the monitoring point whose flow rate exceeds the flow rate deviation threshold as an abnormal monitoring point;
  • a scale thickness calculation unit calculates the scale thickness according to the flow velocity at the abnormal monitoring point and the flow velocity at the pipeline inlet, and sends the scale thickness calculation result to the scale thickness comparison unit;
  • the scale thickness comparison unit compares the scale thickness calculation result with the preset scale thickness alarm threshold, and sends an alarm instruction to the alarm unit if the scale thickness exceeds the preset scale thickness alarm threshold;
  • the alarm unit receives the alarm instruction from the scale thickness comparison unit and sends an alarm.
  • the pipeline mouth flow velocity acquisition unit and several monitoring point flow velocity acquisition units can be implemented using an ultrasonic Doppler flow velocity detector and its accessories.
  • the detection end of the ultrasonic Doppler flow velocity detector goes deep into the pipeline, and the connection part with the pipeline is fixed with a matching tooling seat.
  • the tooling seat and the pipeline are welded to ensure that there is no water leakage.
  • the flow rate comparison unit, the scale thickness calculation unit, the scale thickness comparison unit and the alarm unit can be integrated into the central control system of the power station, and the alarm unit can be connected to the sound, light and electric alarm to issue an alarm.
  • the scale monitoring is carried out on the pipeline of the cooling water system of a power station.
  • the pipeline at the outlet of the heat exchange equipment as an example, as shown in Figure 2, it includes a straight pipe and a curved pipe, the model is DN80, the pipe diameter is 80.0mm, the length of the straight pipe is 8m, and the length of the curved pipe is 2.5m.
  • a monitoring point C0 is set at the pipeline inlet, which is the connection between the heat exchange equipment and the straight pipe, and monitoring points C1 , C2 , C3 and C4 are set on the straight pipe.
  • Monitoring points C5 and C6 are set on the curved pipe.
  • An ultrasonic Doppler flow velocity detector is set at each monitoring point.
  • the distance between C0 and C1 is 1.5m
  • the distance between C1 , C2 , C3 and C4 is 2m
  • the distance between C5 and C6 is 1.5m.
  • the flow velocity in the pipeline measured at C0 is 3m/s
  • the flow velocity deviation threshold is set to 3.6m/s.
  • the flow velocity values of each measuring point are as follows: C1 is 3.08m/s, C2 is 3.12m/s, C3 is 3.45m/s, C4 is 3.72m/s, C5 is 3.86m/s, and C6 is 3.87m/s.
  • C4 , C5 and C6 are abnormal detection points.
  • the scale thickness at C4 is 1.29mm
  • the scale thickness at C5 is 2.69mm
  • the scale thickness at C6 is 2.79mm.
  • the scale thickness alarm threshold is set to 5% of the pipeline radius, so the C5 and C6 monitoring points trigger an alarm to remind the operation and maintenance personnel to remove scale; at the same time, anti-scaling operations are performed on the C4 monitoring point.

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)

Abstract

一种换热系统管道水垢在线监测方法，包括：首先在管道上沿长度方向确定若干监测点，分别获取每个监测点处管道内的流速，并获取同一时刻管道进口处的流速；然后将每个监测点处管道内的流速与管道进口处的流速进行比较，将流速超过流速偏差阈值的监测点，确定为异常监测点；最后根据异常监测点的流速和管道进口处的流速计算得到水垢厚度，若水垢厚度超过预设的水垢厚度报警阈值，则发出警报。方法实施简单、自动化程度高，能够对管道内的水垢厚度进行实时监测，定量计算出水垢厚度，并及时发出警报，能够指导日常防垢和后续的除垢工作，保证电站的安全稳定运行。还公开了一种换热系统管道水垢在线监测系统。

Description

一种换热系统管道水垢在线监测方法及系统
相关申请的交叉引用
本申请要求在2023年07月06日提交中国专利局、申请号为202310825334.1、发明名称为“一种换热系统管道水垢在线监测方法及系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请属于水垢监测技术领域，具体涉及一种换热系统管道水垢在线监测方法及系统。
背景技术
管道在长期使用过程中，水中的粒子结合后会形成不溶、难溶和微溶的物质，也就是水垢。水垢的形成一般会经历成核长大的过程，先是少数垢核心在管道表面形成、附着，然后更多的其它成垢化合物在这些核心周围聚集，成为更大的垢团，对管道内流体的流速和流量造成影响，严重时甚至阻塞管道。
目前，电站换热系统管道中水垢的监测主要采用现场监测法和实验室阻垢测定法，实验室阻垢测定法主要用于理论研究，不能获得实际的结构情况。现场监测法主要采用监测换热器法，是将运行一定时间后的监测换热器拆开，将其换热管剖开，观察其中沉积物的沉积情况，测定已析出的沉积物层厚度，然后利用监测换热器测定在冷却水系统中的污垢热阻值，预测或判断换热器内沉积物沉积的程度，该方法不能实现在线监测，实施手段较为复杂。
发明内容
为了解决上述现有技术中存在的缺陷，本申请的目的在于提供一种换热系统管道水垢在线监测方法及系统，实施简单、自动化程度高，能够对管道内的水垢厚度进行实时监测，定量计算出水垢厚度，并及时发出警报，能够指导日 常防垢和后续的除垢工作，保证电站的安全稳定运行。
本申请是通过以下技术方案来实现：
本申请公开的一种换热系统管道水垢在线监测方法，包括：
S1：在管道上沿长度方向确定若干监测点，分别获取每个监测点处管道内的流速，并获取同一时刻管道进口处的流速；
S2：将每个监测点处管道内的流速与管道进口处的流速进行比较，将流速超过流速偏差阈值的监测点，确定为异常监测点；
S3：根据异常监测点的流速和管道进口处的流速计算得到水垢厚度，若水垢厚度超过预设的水垢厚度报警阈值，则发出警报。
可选地，步骤S1中，所述监测点的数量≥3。
可选地，步骤S1中，若干监测点等距离分布。
可选地，步骤S1中，在直管段上，若干监测点之间的距离≥1.5m。
可选地，步骤S1中，在弯管段上，若干监测点之间的距离≥1m。
可选地，步骤S1中，监测点与管道进口的距离≥1m。
可选地，步骤S1中，管道进口处的流速和监测点的流速通过超声多普勒流速检测仪获得。
可选地，步骤S2中，所述流速偏差阈值＝管道进口处的流速×120％。
可选地，步骤S3中，异常监测点处的水垢厚度d通过下式计算得到：
式中，r1为管道进口处半径，V1为管道进口处的流速，V2为异常监测点的流速。
本申请公开的实现上述换热系统管道水垢在线监测方法的系统，包括管道口流速获取单元、流速比较单元、水垢厚度计算单元、警报单元、水垢厚度比较单元和若干监测点流速获取单元；
管道口流速获取单元，获取管道进口处的流速并发送至流速比较单元；
若干监测点流速获取单元，获取管道内的流速，并发送至流速比较单元
流速比较单元，将每个监测点处管道内的流速与管道进口处的流速进行比较，将流速超过流速偏差阈值的监测点，确定为异常监测点；
水垢厚度计算单元，根据异常监测点的流速和管道进口处的流速计算水垢厚度，并将水垢厚度计算结果发送至水垢厚度比较单元；
水垢厚度比较单元，将水垢厚度计算结果与预设的水垢厚度报警阈值进行比较，若水垢厚度超过预设的水垢厚度报警阈值，向警报单元发送警报指令；
警报单元，接收来自水垢厚度比较单元的警报指令并发送警报。
与现有技术相比，本申请具有以下有益的技术效果：
本申请公开的换热系统管道水垢在线监测方法，通过在管道上设置若干监测点，对管道内的流速进行实时在线监测，并以同一时刻管道进口处的流速为基准进行比较，通常在管道进口处水垢不易产生；当管道内壁存在水垢时，该处的过流面积会减小，而相应的流速会提高，若监测点流速超过设定的流速偏差阈值时，将该监测点作为异常监测点；管道内的水垢，通常可以近似为紧贴管道内壁的环形，因此可以进一步定量的计算得到水垢厚度，若水垢厚度超过预设的水垢厚度报警阈值时发出警报，提示运维人员进行下一步的除垢工作。本申请实施简单、自动化程度高，能够对管道内的水垢厚度进行实时监测，定量计算出水垢厚度，并及时发出警报，能够指导日常防垢和后续的除垢工作，保证电站的安全稳定运行。
可选地，监测点的数量≥3，能够对管道进行多点分段监测，提高监测结果和位置的准确性。
可选地，若干监测点等距离分布，提高监测点的流速数据之间的可比性，提高监测结果的准确性。
可选地，在直管段上，若干监测点之间的距离≥1.5m，距离过小流速近似不变，设置监测点过密会增加成本。同时由于弯管段长度较小，因此在弯管段上，若干监测点之间的距离≥1m。
可选地，监测点与管道进口的距离≥1m，距离过小监测的数值变化不大。
本申请公开的实现上述换热系统管道水垢在线监测方法的系统，构建简单，能够很好地与现有换热系统兼容，能够应用在新建电站和已有电站的改造上。
附图说明
图1为本申请的方法流程示意图；
图2为本申请的监测点设置示意图。
具体实施方式
下面结合附图和具体实施例对本申请做进一步的详细说明，所述是对本申请的解释而不是限定。
如图1，为本申请的换热系统管道水垢在线监测方法，包括：
S1：在管道上沿长度方向确定若干监测点，分别获取每个监测点处管道内的流速，并获取同一时刻管道进口处的流速；
S2：将每个监测点处管道内的流速与管道进口处的流速进行比较，将流速超过流速偏差阈值的监测点，确定为异常监测点；
S3：根据异常监测点的流速和管道进口处的流速计算得到水垢厚度，若水垢厚度超过预设的水垢厚度报警阈值，则发出警报。
水垢厚度报警阈值通常综合考虑设备类型、管道材质和管径进行设置。
在本申请的一个较优的实施例中，步骤S1中，所述监测点的数量≥3。
在本申请的一个较优的实施例中，步骤S1中，若干监测点等距离分布。
在本申请的一个较优的实施例中，步骤S1中，在直管段上，若干监测点之间的距离≥1.5m。
在本申请的一个较优的实施例中，步骤S1中，在弯管段上，若干监测点之间的距离≥1m。
在本申请的一个较优的实施例中，监测点与管道进口的距离≥1m。
在本申请的一个较优的实施例中，步骤S1中，若干监测点设置在同一类 型的管道上。这里的管道类型是指直管或弯管。
在本申请的一个较优的实施例中，步骤S1中，管道进口处的流速和监测点的流速通过超声多普勒流速检测仪获得。
在本申请的一个较优的实施例中，步骤S2中，所述流速偏差阈值＝管道进口处的流速×120％。
在本申请的一个较优的实施例中，步骤S3中，异常监测点处的水垢厚度d通过下式计算得到：
式中，r1为管道进口处半径，V1为管道进口处的流速，V2为异常监测点的流速。
本申请的一种实现上述换热系统管道水垢在线监测方法的系统
包括管道口流速获取单元、流速比较单元、水垢厚度计算单元、警报单元、水垢厚度比较单元和若干监测点流速获取单元；
管道口流速获取单元，获取管道进口处的流速并发送至流速比较单元；
若干监测点流速获取单元，获取管道内的流速，并发送至流速比较单元
流速比较单元，将每个监测点处管道内的流速与管道进口处的流速进行比较，将流速超过流速偏差阈值的监测点，确定为异常监测点；
水垢厚度计算单元，根据异常监测点的流速和管道进口处的流速计算水垢厚度，并将水垢厚度计算结果发送至水垢厚度比较单元；
水垢厚度比较单元，将水垢厚度计算结果与预设的水垢厚度报警阈值进行比较，若水垢厚度超过预设的水垢厚度报警阈值，向警报单元发送警报指令；
警报单元，接收来自水垢厚度比较单元的警报指令并发送警报。
其中，管道口流速获取单元和若干监测点流速获取单元可以采用超声多普勒流速检测仪及其附件实现，超声多普勒流速检测仪的探测端深入至管道内，与管道的连接部分采用匹配的工装座固定，工装座与管道焊接保证不漏水。
流速比较单元、水垢厚度计算单元、水垢厚度比较单元和警报单元可以集成在电站的中控系统内，警报单元可以连接声、光、电警报器发出警报。
下面以一个具体实施例来对本申请进行进一步地解释说明：
对某电站的冷却水系统的管道进行水垢监测，以换热设备出口处的管道为例，如图2，包含一段直管和一段弯管，型号为DN80，管径均为80.0mm，直管的长度为8m，弯管的长度为2.5m，在管道进口处也就是换热设备和直管的连接处设置监测点C0，在直管上设置监测点C1、C2、C3和C4，在弯管上设置监测点C5和C6，每个监测点设置一个超声多普勒流速检测仪。C0与C1间距为1.5m，C1、C2、C3和C4之间间距为2m，C5与C6间距为1.5m。
C0处测得管道内的流速为3m/s，设置流速偏差阈值为3.6m/s。各测点流速数值如下：C1为3.08m/s，C2为3.12m/s，C3为3.45m/s，C4为3.72m/s，C5为3.86m/s，C6为3.87m/s。其中C4、C5和C6为异常检测点，经计算，C4处的水垢厚度为1.29mm，C5处的水垢厚度为2.69mm，C6处的水垢厚度为2.79mm。在本实施例中，水垢厚度报警阈值设置为管道半径的5％，因此C5和C6监测点出发警报，提醒运维人员进行除垢；同时对C4监测点进行防垢操作。
需要说明的是，以上所述仅为本申请实施方式的一部分，根据本申请所描述的系统所做的等效变化，均包括在本申请的保护范围内。本申请所属技术领域的技术人员可以对所描述的具体实例做类似的方式替代，只要不偏离本申请的结构或者超越本权利要求书所定义的范围，均属于本申请的保护范围。

Claims (10)

  1. 一种换热系统管道水垢在线监测方法，其特征在于，包括：
    S1：在管道上沿长度方向确定若干监测点，分别获取每个监测点处管道内的流速，并获取同一时刻管道进口处的流速；
    S2：将每个监测点处管道内的流速与管道进口处的流速进行比较，将流速超过流速偏差阈值的监测点，确定为异常监测点；
    S3：根据异常监测点的流速和管道进口处的流速计算得到水垢厚度，若水垢厚度超过预设的水垢厚度报警阈值，则发出警报。
  2. 如权利要求1所述的换热系统管道水垢在线监测方法，其特征在于，步骤S1中，所述监测点的数量≥3。
  3. 如权利要求1所述的换热系统管道水垢在线监测方法，其特征在于，步骤S1中，若干监测点等距离分布。
  4. 如权利要求1所述的换热系统管道水垢在线监测方法，其特征在于，步骤S1中，在直管段上，若干监测点之间的距离≥1.5m。
  5. 如权利要求1所述的换热系统管道水垢在线监测方法，其特征在于，步骤S1中，在弯管段上，若干监测点之间的距离≥1m。
  6. 如权利要求1所述的换热系统管道水垢在线监测方法，其特征在于，步骤S1中，监测点与管道进口的距离≥1m。
  7. 如权利要求1所述的换热系统管道水垢在线监测方法，其特征在于，步骤S1中，管道进口处的流速和监测点的流速通过超声多普勒流速检测仪获得。
  8. 如权利要求1所述的换热系统管道水垢在线监测方法，其特征在于，步骤S2中，所述流速偏差阈值＝管道进口处的流速×120％。
  9. 如权利要求1所述的换热系统管道水垢在线监测方法，其特征在于，步骤S3中，异常监测点处的水垢厚度d通过下式计算得到：
    式中，r1为管道进口处半径，V1为管道进口处的流速，V2为异常监测点的流速。
  10. 一种实现权利要求1-9中任一项所述的换热系统管道水垢在线监测方法的系统，其特征在于，包括管道口流速获取单元、流速比较单元、水垢厚度计算单元、警报单元、水垢厚度比较单元和若干监测点流速获取单元；
    管道口流速获取单元，获取管道进口处的流速并发送至流速比较单元；
    若干监测点流速获取单元，获取管道内的流速，并发送至流速比较单元
    流速比较单元，将每个监测点处管道内的流速与管道进口处的流速进行比较，将流速超过流速偏差阈值的监测点，确定为异常监测点；
    水垢厚度计算单元，根据异常监测点的流速和管道进口处的流速计算水垢厚度，并将水垢厚度计算结果发送至水垢厚度比较单元；
    水垢厚度比较单元，将水垢厚度计算结果与预设的水垢厚度报警阈值进行比较，若水垢厚度超过预设的水垢厚度报警阈值，向警报单元发送警报指令；
    警报单元，接收来自水垢厚度比较单元的警报指令并发送警报。
PCT/CN2024/093014 2023-07-06 2024-05-14 一种换热系统管道水垢在线监测方法及系统 Ceased WO2025007650A1 (zh)

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