A heat exchanger and an on-line device and method for measuring fouling tendency of a tube network of the heat exchanger

Abstract

This invention discloses an online measurement device and method for the scaling tendency of a heating heat exchanger and its pipeline network. The device includes a sample processing unit, a detection unit, and a control unit. The sample processing unit includes a water sample cooler and an aging and heat-insulating water tank. The inlet of the aging and heat-insulating water tank is connected to the low-temperature side outlet water sampling pipe of the heating heat exchanger, and the outlet of the aging and heat-insulating water tank and the low-temperature side inlet water sampling pipe of the heating heat exchanger are both connected to the inlet of the water sample cooler. The detection unit is connected to the outlet of the water sample cooler. The control unit is electrically connected to the detection unit. The controller is connected to the heat exchanger inlet water sampling valve and Ca... 2+ The online monitoring instrument, heat exchanger outlet water sampling valve, water tank drain valve, water tank vent valve, and aged water outlet valve are electrically connected. This invention's method can conveniently and promptly detect scaling tendencies and calcium deposits in heating heat exchangers and their piping networks without manual intervention. 2+ The content is measured online simultaneously.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat supply heat exchanger and its pipe network online measurement, in particular to a heat supply heat exchanger and its pipe network scaling tendency online measurement device and method. BACKGROUND

[0002] The heat supply heat exchanger and its pipe network are the main components of the city or heat supply system, which plays a role in energy transfer and transportation. With the increase of water temperature in the heat exchanger and pipe network, the heat supply heat exchanger and its pipe network are prone to scaling, especially the heat exchanger and its pipe network of the primary network of the city heat supply system. Once the heat exchanger is scaled, the heat exchange efficiency is reduced, and the heat energy cannot be transported to the heating user. The scaling of the heat supply pipe network increases the energy consumption for transportation. Therefore, various methods are taken in the heat supply system to avoid or monitor the scaling of the heat supply heat exchanger and its pipe network.

[0003] At present, the common methods for monitoring whether the heat supply heat exchanger and its pipe network are scaled include direct monitoring of the heat exchange surface and monitoring of the heat network water quality. The direct monitoring of the heat exchange surface can find out whether the heat exchanger is scaled, but it needs to wait until the scale continues to increase to make a judgment in order to guide the avoidance or slowing down of the continuous scaling. The monitoring of the heat network water quality index can estimate and guide how to avoid or slow down the continuous scaling according to the test model, but the judgment and guidance significance outside the test model working condition are greatly reduced. SUMMARY

[0004] In order to overcome the above-mentioned deficiencies of the prior art, the present application provides a heat supply heat exchanger and its pipe network scaling tendency online measurement device and method, which can measure the scaling tendency of the heat supply heat exchanger and its pipe network online and in real time, without manual intervention, so as to provide timely feedback on the treatment effect of the heat network and prevent the scaling of the heat supply heat exchanger and its pipe network.

[0005] In order to achieve the above purpose, the present application adopts the following technical solutions:

[0006] A heat supply heat exchanger and its pipe network scaling tendency online measurement device, comprising a sample processing unit, a detection unit and a control unit.

[0007] The sample processing unit comprises a water sample cooler and an aging insulation water tank; the water inlet of the aging insulation water tank is connected with the water sampling pipe at the low temperature side outlet of the heat supply heat exchanger, and the water outlet of the aging insulation water tank is connected with the water sampling pipe at the low temperature side inlet of the heat supply heat exchanger, both of which are connected with the water inlet of the water sample cooler;

[0008] The detection unit is connected with the outlet of the water sample cooler;

[0009] The control unit is electrically connected with the detection unit.

[0010] As a further improvement of the present application, the detection unit is a Ca2+ Online monitoring instrument.

[0011] As a further improvement of the present application, a heat exchanger inlet water sampling valve is arranged on the heat exchanger low-temperature side inlet water sampling pipe, and the control unit is electrically connected with the heat exchanger inlet water sampling valve.

[0012] As a further improvement of the present application, a heat exchanger outlet water sampling valve is arranged on the heat exchanger low-temperature side outlet water sampling pipe, and the control unit is electrically connected with the heat exchanger outlet water sampling valve.

[0013] As a further improvement of the present application, the outlet of the aging heat preservation water tank is divided into two paths, one of which is provided with a water tank discharge valve, and the other of which is provided with an aging water outlet valve, and the aging water outlet valve is connected with the water inlet of the water sample cooler.

[0014] The control unit is electrically connected with the water tank discharge valve and the aging water outlet valve.

[0015] As a further improvement of the present application, the aging heat preservation water tank is further provided with a water tank vent valve, and the control unit is electrically connected with the water tank vent valve.

[0016] As a further improvement of the present application, the height of the aging heat preservation water tank satisfies the liquid level difference of the aging heat preservation water tank to Ca 2+ The online monitoring instrument provides sample flow power.

[0017] A measurement method of a heat supply heat exchanger and an online measurement device for measuring the scaling tendency of the pipe network thereof, comprising the following steps:

[0018] After the water sample cooler and the detection unit are flushed clean by the water inlet of the heat supply heat exchanger low-temperature side inlet water sampling pipe, the Ca 2+ content c1 of the water inlet of the heat supply heat exchanger low-temperature side inlet water sampling pipe is detected.

[0019] After the heat supply heat exchanger low-temperature side outlet water sampling pipe is opened, the water sample flushes and fills the aging heat preservation water tank, and after the water sample in the aging heat preservation water tank is flushed clean by the water sample cooler and the detection unit after the reaction, the Ca 2+ content c2 is detected.

[0020] The control unit determines whether the heat supply heat exchanger and the pipe network thereof have scaling according to the ratio of the two water samples.

[0021] As a further improvement of the present application, the control unit determines whether the heat supply heat exchanger and the pipe network thereof have scaling according to the ratio of the two water samples, specifically:

[0022] First, the ratio K of the two water samples is calculated:

[0023] K = c1 / c2………

[0024] In the formula, c1 is the Ca of the inlet water on the low-temperature side of the heating heat exchanger. 2+ Content; c2 is the Ca content of the low-temperature side outlet water of the heating heat exchanger after aging. 2+ content;

[0025] Determine if scaling has occurred:

[0026] When K≥1.2, it indicates that the heating heat exchanger and its piping network have a tendency to scale; otherwise, there is no tendency to scale.

[0027] As a further improvement of the present invention, the water pressure in the sampling tube where the water sample cooler is located is 0.05 to 0.1 MPa.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] The device of this invention includes a sample processing unit, a detection unit, and a control unit; the measuring device can measure the Ca content of the low-temperature inlet water of a heat exchanger. 2+ Monitoring the content of calcium carbonate (Ca) can also provide timely monitoring of whether the heat exchanger and its piping network have a tendency to scale. The measurement method of the measuring device is based on the aging of Ca in the low-temperature side inlet water and low-temperature side outlet water of the heat exchanger. 2+ Using the comparison results of the content to judge the scaling tendency is more accurate and timely in determining whether scaling has occurred in the heating heat exchanger and its piping network.

[0030] This invention enables automatic online data collection from heat exchangers and their piping networks. It is simple, practical, and highly accurate in measuring the scaling tendency of heat exchangers and their piping networks, and can quickly obtain the Ca content in heat exchangers and their piping networks. 2+ The content of calcium in the heating system and whether it is in a scaling state are monitored, and the results are fed back in a timely manner to meet the monitoring requirements of the heating heat exchanger and its piping network. Compared with the current situation of calcium content in heating heat exchangers and their piping networks, the monitoring of the heating system is more efficient. 2+ Other measurements for determining the content and scaling tendency can quickly and accurately assess the Ca content in heating heat exchangers and their piping networks. 2+ The measurement of content and scaling tendency is highly accurate, reducing errors introduced by manual measurement. It solves the problems of untimely monitoring of scaling tendency in heating heat exchangers and their pipe networks and the large workload, which is conducive to the safe, automatic control or intelligent operation of heating heat exchangers and their pipe networks.

[0031] The measurement method of this invention is used to determine the scaling tendency of heating heat exchangers and their piping networks, and to correlate the Ca2+ content of the low-temperature inlet water and low-temperature outlet water after aging. 2+ The comparison results of the content are correlated, which improves the accuracy and timeliness of determining whether the heating heat exchanger and its pipeline network have a tendency to scale. This improves the speed and accuracy of the scale determination of the heating heat exchanger and its pipeline network, while reducing the workload of the operators and improving the safety of the operation of the heating heat exchanger and its pipeline network.

[0032] The measurement method of the heat supply heat exchanger and its pipe network scaling tendency online measurement device has the advantages of monitoring Ca 2+ Besides water quality indexes, it can also determine whether the heat supply heat exchanger and its pipe network have scaling tendency in time, guide and feedback heat network water dosing and other treatment industry adjustment in time, so as to avoid scaling of the heat supply heat exchanger and its pipe network in time. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The heat supply heat exchanger and its pipe network scaling tendency online measurement device;

[0034] Figure 2 The heat supply heat exchanger and its pipe network scaling tendency online measurement method flow chart.

[0035] 1, heat exchanger inlet water sampling valve; 2, water sample cooler; 3, Ca 2+ online monitoring instrument; 4, aging heat preservation water tank; 5, heat exchanger outlet water sampling valve; 6, water tank discharge valve; 7, water tank vent valve; 8, aging water outlet valve; 9, controller. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0037] The present application provides a heat supply heat exchanger and its pipe network scaling tendency online measurement device, comprising a sample processing unit, a detection unit and a control unit;

[0038] The sample processing unit comprises a water sample cooler 2 and an aging heat preservation water tank 4; the water inlet of the aging heat preservation water tank 4 is connected with a heat supply heat exchanger low temperature side outlet water sampling pipe, and the water outlet of the aging heat preservation water tank 4 is connected with a heat supply heat exchanger low temperature side inlet water sampling pipe, both of which are connected with the water inlet of the water sample cooler 2;

[0039] The detection unit is connected with the outlet of the water sample cooler 2;

[0040] The control unit is electrically connected with the detection unit.

[0041] As a preferred embodiment, the detection unit is a Ca 2+ online monitoring instrument 3. The Ca 2+ concentration can be obtained to obtain scaling information.

[0042] As a preferred embodiment, the heat supply heat exchanger low-temperature side inlet water sampling pipe is provided with a heat exchanger inlet water sampling valve 1, the heat supply heat exchanger low-temperature side outlet water sampling pipe is provided with a heat exchanger outlet water sampling valve 5, the aging heat preservation water tank 4 outlet is divided into two ways, one way is provided with a water tank discharge valve 6, the other way is provided with an aging water outlet valve 8, the aging water outlet valve 8 is connected with the water inlet of the water sample cooler 2; the aging heat preservation water tank 4 is further provided with a water tank vent valve 7, the control unit is connected with the water tank discharge valve 6, the aging water outlet valve 8 and the water tank vent valve 7 controller 9 respectively with the heat exchanger inlet water sampling valve 1, Ca 2+ The online monitoring instrument 3, the heat exchanger outlet water sampling valve 5, the water tank discharge valve 6, the water tank vent valve 7 and the aging water outlet valve 8 are electrically connected.

[0043] The water sample cooler 2 is arranged before the Ca 2+ Online monitoring instrument 3. The water sample detection unit is arranged before the Ca 2+ Online monitoring instrument 3, which can be connected to the heat supply heat exchanger low-temperature side inlet and outlet water samples respectively.

[0044] Key, the aging heat preservation water tank 5 is arranged to meet the liquid level difference of the aging heat preservation water tank 5 to Ca 2+ Online monitoring instrument 3 provides sample flow power. The aging heat preservation water tank 4 is arranged on the detection pipeline of the heat supply heat exchanger low-temperature side outlet water, and the liquid level difference of the aging heat preservation water tank 5 is arranged to Ca 2+ Online monitoring instrument 3 provides sample flow power.

[0045] The application also provides a measurement method based on the online measurement device of the heat supply heat exchanger and the scaling tendency of the pipe network thereof, which comprises the following steps:

[0046] After the water sample cooler 2 and the detection unit are flushed clean by the water from the heat supply heat exchanger low-temperature side inlet water sampling pipe, the Ca 2+ Content c1 of the heat supply heat exchanger low-temperature side inlet water is detected.

[0047] After the heat supply heat exchanger low-temperature side outlet water sampling pipe is opened, the water sample is flushed and the aging heat preservation water tank 4 is filled, and after the water sample in the aging heat preservation water tank 4 is flushed clean by the water sample cooler 2 and the detection unit after reaction, the Ca 2+ Content c2 is detected.

[0048] The control unit judges whether the heat supply heat exchanger and the pipe network thereof are scaled according to the ratio of the two water samples.

[0049] The method of the application can conveniently realize the online measurement of the scaling tendency of the heat supply heat exchanger and the pipe network thereof and the Ca 2+ Content at the same time without manual intervention. The measurement method of the measurement device can realize the measurement of the Ca2+ The measurement device can also measure the calcium content of heating heat exchangers and their piping networks to determine whether they have a tendency to scale. The measurement method of the device is based on the aging of the Ca2+ content in the low-temperature inlet water and low-temperature outlet water of the heat exchanger. 2+ The comparison results of the content are used to determine the scaling tendency.

[0050] The following is in conjunction with the appendix Figure 1 and attached Figure 2 The specific embodiments of the present invention will be further described below.

[0051] Example

[0052] like Figure 1 As shown, the present invention provides a heating heat exchanger and an online measuring device for scaling tendency of its pipeline network, comprising a sample processing unit and a control and detection unit.

[0053] Its sample processing unit includes a heat exchanger inlet water sampling valve 1, a water sample cooler 2, an aging and heat preservation water tank 4, a heat exchanger outlet water sampling valve 5, a water tank discharge valve 6, a water tank vent valve 7, and an aging water outlet valve 8.

[0054] The heat exchanger inlet water sampling valve 1 is connected to the low-temperature side inlet water sampling pipe of the heating heat exchanger; the heat exchanger outlet water sampling valve 5 is connected to the low-temperature side outlet water sampling pipe of the heating heat exchanger, and the detection pipeline of the low-temperature side outlet water of the heating heat exchanger is equipped with an aging and heat preservation water tank 4.

[0055] The detection unit and control unit include Ca 2+ Online monitoring instrument 3 and controller 9. Controller 9 is connected to heat exchanger inlet water sampling valve 1 and Ca, respectively. 2+ 3. Online monitoring instrument, 5. Heat exchanger outlet water sampling valve, 6. Water tank drain valve, 7. Water tank vent valve, 8. Aged water outlet valve (electrical connection).

[0056] The specific working process is as follows: Open the inlet water sample valve 1 of the heat exchanger, and connect the water sample cooler 2 and Ca... 2+ After the online monitoring instrument 3 is rinsed clean, the Ca content of the incoming water from the heat exchanger inlet water sampling valve 1 is measured. 2+ With a concentration of c1, close the heat exchanger inlet water sampling valve 1; open the heat exchanger outlet water sampling valve 5, and after the water sample has been rinsed and the aging and heat preservation water tank 4 has been filled, close the heat exchanger outlet water sampling valve 5 and the aging water outlet valve 8, wait 60 minutes, then open the aging water outlet valve 8, and wait for the water sample in the aging and heat preservation water tank 4 to cool the water sample cooler 2 and Ca. 2+ After rinsing the online monitoring instrument 3 clean, it was used to detect Ca. 2+ The content c2 is then used to determine whether scaling has occurred in the heating heat exchanger and its pipeline network based on the ratio of the two water samples.

[0057] Install a sampling pipe for the low-temperature inlet water of the heat exchanger at the inlet water sampling valve 1, and install a sampling pipe for the low-temperature outlet water of the heat exchanger at the outlet water sampling valve 5; ensure that the water pressure in the sampling pipe is approximately 0.05–0.1 MPa to facilitate the flow of the water sample into Ca. 2+ Measurements are taken within the online monitoring instrument 3.

[0058] As attached Figure 1 As shown, open the heat exchanger inlet water sample valve 1, and connect the water sample cooler 2 and Ca... 2+ After the online monitoring instrument 3 is rinsed clean, the Ca content of the incoming water from the heat exchanger inlet water sampling valve 1 is measured. 2+ With a concentration of c1, close the heat exchanger inlet water sampling valve 1; open the heat exchanger outlet water sampling valve 5, and after the water sample has been rinsed and the aging and heat preservation water tank 4 has been filled, close the heat exchanger outlet water sampling valve 5 and the aging water outlet valve 8, wait 60 minutes, then open the aging water outlet valve 8, and wait for the water sample in the aging and heat preservation water tank 4 to cool the water sample cooler 2 and Ca. 2+ After rinsing the online monitoring instrument 3 clean, it was used to detect Ca. 2+ Content c2, based on Ca in the two water samples 2+ Formula 1, which uses the ratio of the content, is used to determine whether the heat exchanger and its piping network are in a scaling state. Specifically:

[0059] K = c1 / c2………Equation 1

[0060] In the formula, c1 is the Ca of the inlet water on the low-temperature side of the heating heat exchanger. 2+ Content; c2 is the Ca content of the low-temperature side outlet water of the heating heat exchanger after aging. 2+ content.

[0061] When K≥1.2, it indicates that the heating heat exchanger and its piping network have a tendency to scale; otherwise, there is no tendency to scale.

[0062] The measurement method based on the above-mentioned online scaling tendency measurement device for heating heat exchangers and their pipe networks includes the following steps:

[0063] This device first takes the inlet water from the low-temperature side of the heat exchanger, cools it, and then uses Ca... 2+ The online content measuring instrument measured the Ca content in the low-temperature side inlet water of the heating heat exchanger. 2+ Content; simultaneously, take water from the low-temperature side outlet of the heating heat exchanger and store it in an aging and heat preservation box for 60 minutes, then cool it and use Ca 2+ The online measuring instrument measured the Ca content in the aging water of the low-temperature side outlet water of the heating heat exchanger. 2+ Content; based on the Ca content of the aged water at the low-temperature inlet and outlet of the heat exchanger. 2+ The comparison results of the content are used to determine the scaling tendency, and at the same time, it serves as an online monitoring tool for Ca in the low-temperature side inlet water of the heating heat exchanger. 2+ The role of content.

[0064] In summary, the device of the application has simple structure and can realize automatic measurement process, and the method of the application can conveniently realize the scaling tendency and Ca 2+ Simultaneous online measurement of content.

[0065] The above merely provides the preferred but non-restrictive embodiment of the application, and the protection scope of the application should not be limited to this. Any change or replacement within the disclosed technical scope of the application can be easily thought by those skilled in the art, and should be covered within the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A heat exchanger and a measuring method for on-line measuring of fouling tendency of a tube network of the heat exchanger, characterized in that, The device comprises a sample processing unit, a detection unit and a control unit. The sample processing unit comprises a water sample cooler (2) and an aging heat preservation water tank (4); the inlet of the aging heat preservation water tank (4) is connected with the water sampling pipe at the low temperature side outlet of the heat supply heat exchanger, and the outlet of the aging heat preservation water tank (4) is connected with the water sampling pipe at the low temperature side inlet of the heat supply heat exchanger, both of which are connected with the inlet of the water sample cooler (2); The detection unit is connected with the outlet of the water sample cooler (2); The control unit is electrically connected with the detection unit; The measurement method of the heat supply heat exchanger and the fouling tendency online measurement device of the pipe network thereof comprises the following steps: After the water sample cooler (2) and the detection unit are flushed clean by the water from the water sampling pipe at the low-temperature side inlet of the heat supply heat exchanger, the Ca 2+ content c1; Open the low temperature side outlet water sampling pipe of the heat supply heat exchanger, and after the water sample is flushed and the aging heat preservation water tank (4) is sufficiently aged, detect the Ca content c2 of the water sample in the aging heat preservation water tank (4) after the water sample is flushed clean through the water sample cooler (2) and the detection unit after reaction 2+ content c2; The control unit determines whether the heat supply heat exchanger and the pipe network thereof have fouling according to the ratio of the two water samples; The control unit determines whether the heat supply heat exchanger and the pipe network thereof have fouling according to the ratio of the two water samples, specifically as follows: First, calculate the ratio K of the two water samples: K = c1 / c2………(Formula 1) wherein c1 is the Ca content of the water at the inlet of the low temperature side of the heat supply heat exchanger 2+ wherein c2 is the Ca content of the water at the outlet of the low temperature side of the heat supply heat exchanger after aging 2+ wherein c2 is the Ca content of the water at the outlet of the low temperature side of the heat supply heat exchanger after aging Determine whether fouling occurs: When K≥1.2, it indicates that the heat supply heat exchanger and the pipe network thereof have a tendency to foul, otherwise, no fouling tendency occurs; The water pressure in the sampling pipe where the water sample cooler (2) is located is 0.05-0.1 Mpa.

2. The measurement method of a heating heat exchanger and its pipeline scaling tendency online measurement device according to claim 1, characterized in that, The detection unit is Ca 2+ Online monitoring instrument (3).

3. The measurement method of the online scaling tendency measuring device for a heating heat exchanger and its pipeline network according to claim 1, characterized in that, The heat exchanger inlet water sampling valve (1) is arranged on the heat supply heat exchanger low temperature side inlet water sampling pipe, and the control unit is electrically connected with the heat exchanger inlet water sampling valve (1).

4. The measurement method of a heating heat exchanger and its pipeline scaling tendency online measurement device according to claim 1, characterized in that, The heat exchanger outlet water sampling valve (5) is arranged on the heat supply heat exchanger low temperature side outlet water sampling pipe, and the control unit is electrically connected with the heat exchanger outlet water sampling valve (5).

5. The measurement method of a heating heat exchanger and its pipeline scaling tendency online measurement device according to claim 1, characterized in that, The outlet of the aging heat preservation water tank (4) is divided into two routes, one of which is provided with a water tank discharge valve (6), and the other of which is provided with an aging water outlet valve (8), which is connected with the inlet of the water sample cooler (2); The control unit is electrically connected with the water tank discharge valve (6) and the aging water outlet valve (8).

6. The measurement method of the online scaling tendency measuring device for a heating heat exchanger and its pipeline network according to claim 1, characterized in that, The aging heat preservation water tank (4) is also provided with a water tank vent valve (7), and the control unit is electrically connected with the water tank vent valve (7).

7. The method according to claim 1, wherein the method is characterized by: The aging heat preservation water tank (4) is set to a height to meet the liquid level difference inside the aging heat preservation water tank (4) to Ca 2+ The online monitor (3) provides sample flow power.

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