CN111982980A - Boiler pipeline leakage detection device - Google Patents

Abstract

The present application relates to a boiler pipeline leakage detection device, and relates to the field of boiler detection, which includes a first conductivity detection device, a cation exchange column, a second conductivity detection device, a degassing device and a third conductivity detection device which are sequentially connected through pipes The degassing device includes a heat exchanger, a heater and a water-gas separator connected in sequence by pipelines, the water-gas separator is connected to the heat exchanger through a pipeline, and the water sample output from the water-gas separator is The water sample before entering the heater undergoes heat exchange in the heat exchanger. The first conductivity detection device is used to detect the initial hydrogen conductivity σ ₁ , and the second conductivity detection device is used to detect the hydrogen conductivity σ after cation exchange. _2. The third conductivity detection device is used to detect the conductivity σ ₃ of degassed hydrogen. The application can detect the corrosiveness of boiler water and whether there is leakage in the boiler.

Description

A boiler pipeline leak detection device

technical field

The present application relates to the technical field of boiler detection, and in particular, to a boiler pipeline leak detection device.

Background technique

The main working principle of the boiler is a thermal equipment that uses the heat energy released after the combustion of fuel or the waste heat in industrial production to transfer to the water in the container, so that the water can reach the required temperature or a certain pressure of steam. It is mostly used in thermal power stations, ships, locomotives and industrial and mining enterprises.

When there are many calcium and magnesium ions in the boiler water, it is easy to form scale. The scale will cause the boiler to corrode and cause the leakage of the furnace tube. The high-pressure gas in the boiler will enter into the leaking furnace tube, and the boiler corrosion will shorten the service life of the boiler. cause a safety hazard. Hydrogen conductivity is an important indicator to characterize the purity and corrosiveness of boiler water. It refers to the conductivity value obtained by monitoring the conductivity after the cations in the tested water sample are converted into H ⁺ . The existing detection method generally reflects the corrosiveness of water to the boiler through the hydrogen conductivity, but it is impossible to directly judge whether the boiler has leaked.

SUMMARY OF THE INVENTION

In view of the shortcomings of the prior art, the present application provides a boiler pipeline leakage detection device, which can detect the corrosiveness of boiler water and whether there is leakage in the boiler.

The above-mentioned effects of the present application are achieved through the following technical solutions:

A boiler leakage detection device, comprising a first conductivity detection device, a cation exchange column, a second conductivity detection device, a degassing device and a third conductivity detection device connected in sequence through pipelines, the degassing device comprising pipelines in sequence A connected heat exchanger, a heater and a water-gas separator, the water-gas separator is connected to the heat exchanger through a pipeline, and the water sample output from the water-gas separator is in heat exchange with the water sample before entering the heater Heat exchange is carried out in the device, the first conductivity detection device is used to detect the initial hydrogen conductivity σ ₁ , the second conductivity detection device is used to detect the hydrogen conductivity σ ₂ after cation exchange, and the third conductivity detection device is used for Degassed hydrogen conductivity σ ₃ was detected.

By adopting the above technical solution, the detection value σ1 measured by the _first conductivity detection device is the cation conductivity of the boiler water in the initial state. After the boiler water passes through the cation exchange column, the cations in the water are replaced by H ⁺ , and the second conductivity detects The detected value σ ₂ of the device is the hydrogen conductivity after cation replacement. Calculate σ ₂ -σ ₁ =Δ ₁ , Δ ₁ can reflect the content of cations in boiler water. The higher the cation content, the stronger the corrosion ability of boiler water to the boiler. On the contrary, the weaker; if the boiler pipeline leaks, the gas in the furnace will dissolve into the boiler water. After the boiler water is heated by the degassing device, the carbon dioxide is separated from the water. The detection value of the third conductivity detection device is the degassed carbon dioxide removed. Hydrogen conductivity σ ₃ , calculate σ ₂ -σ ₃ =Δ ₂ , Δ ₂ can reflect the content of carbon dioxide in the boiler water, so as to reflect whether the gas in the boiler leaks into the boiler water; the heater of the degassing device heats the boiler water, reducing the The solubility of the gas in water, so that the gas is separated, the degassed boiler water needs to be cooled, and then the degassed hydrogen conductivity σ ₃ is detected. The water sample enters the heat exchanger successively for heat exchange, and the water sample before entering the heater can Pre-heating is performed to increase the heating speed of the heater, and the temperature of the water sample discharged from the water-gas separator can be lowered so as to detect the conductivity σ ₃ of degassed hydrogen. This setting can simplify the equipment structure and save energy.

The present application is further provided as follows: the water-gas separator includes a tank body, and a gas-liquid separation net is arranged in the tank body, and the gas-liquid separation net divides the tank body into an upper chamber and a lower chamber, and the tank body The upper part is provided with a water inlet and an air outlet that communicate with the upper chamber, and a water outlet communicated with the lower chamber. The water sample enters the upper chamber from the water inlet, and then enters through the gas-liquid separation net. The lower chamber is discharged from the water outlet, and the gas in the water sample is separated in the upper chamber by the gas-liquid separation net and discharged from the gas outlet.

By adopting the above technical solution, the water sample enters the upper chamber from the water inlet of the water-gas separator, then enters the lower chamber through the gas-liquid separation net, and is discharged from the water outlet, and the gas escaping from the water sample is discharged from the air outlet, The gas-liquid separation net can block the gas and further prevent a small amount of gas such as foam from entering the lower chamber, thereby improving the accuracy _of the degassed hydrogen conductivity σ3.

The present application is further provided that: the air outlet of the water-gas separator is connected with a water seal.

By adopting the above technical solution, the water seal can prevent the outside air from being sucked back from the air outlet into the upper cavity of the water-gas separator, thereby affecting the efficiency of water-gas separation.

The present application is further provided that: a water pump is installed on the upstream pipeline of the first conductivity detection device.

By adopting the above technical solution, the water sample is pumped into the pipeline of the present application by the water pump.

The present application further provides that: a flow valve is installed on the upstream pipeline of the first conductivity detection device.

By adopting the above technical solution, the flow valve can control the flow rate of the water sample entering the present application. If the flow rate is too large, the efficiency of the cation exchange column will be insufficient, resulting in inaccurate detection data. If the flow rate is too small, the detection efficiency will be low.

The present application further provides that: a flow meter is installed on the upstream pipeline of the first conductivity detection device.

By adopting the above technical solution, the flowmeter can detect the flow rate of the water sample, so that when the flow rate is too large or too small, the water sample can be adjusted in an appropriate range through the flow valve.

The present application is further configured as follows: a strong acid type cation resin is contained in the cation exchange column.

By adopting the above technical scheme, the strong acid type cation resin has strong dissociation ability, and can dissociate and perform ion exchange in an acidic solution.

The present application is further configured to further include a controller and a display, wherein the controller is connected to the first conductivity detection device, the second conductivity detection device, the third conductivity detection device and the display, the first conductivity detection device , the second conductivity detection device and the third conductivity detection device transmit signals to the controller, which transmits signals to the display.

By adopting the above technical solution, the display can display the detection values of the first conductivity detection device, the second conductivity detection device, and the third conductivity detection device, so that the staff can directly obtain the values.

The present application further provides that: the first conductivity detection device, the cation exchange column, the second conductivity detection device, the third conductivity detection device, the controller and the display are all fixedly connected On one side of the mounting plate, the degassing device and most of the pipes are fixedly connected to the other side of the mounting plate, and a water receiving groove is fixedly connected to the bottom of the mounting plate, and the water receiving groove is located on the mounting plate where the degassing device is located On one side, a drain pipe is connected to the bottom of the water receiving tank.

By adopting the above technical solution, when the degassing device located on one side of the mounting plate and most of the pipes leak water, the water can drip into the water receiving tank and be discharged through the drain pipe, which is convenient for cleaning.

To sum up, the present application includes at least one of the following beneficial technical effects:

1. The first conductivity detection device detects the cation conductivity σ ₁ in the initial state of the boiler water, the second conductivity detection device detects the hydrogen conductivity value σ ₂ after cation conversion, and calculates σ ₂ -σ ₁ =Δ ₁ , Δ ₁ can reflect the corrosion ability of boiler water to the boiler; the third conductivity detection device detects the conductivity σ ₃ of degassed hydrogen from which carbon dioxide has been removed, and calculates σ ₂ -σ ₃ =Δ ₂ , and Δ ₂ can reflect the electrical conductivity in the boiler. Whether the gas leaks into the boiler water; the heat exchanger can preheat the water sample before entering the heater, and conduct the temperature of the water sample discharged from the water-gas separator, which simplifies the equipment structure and saves energy;

2. The gas-liquid separation net of the water-gas separator can block the gas and improve the degassing effect, thereby improving the accuracy _of the degassed hydrogen conductivity σ3;

3. The display can display the detection values of the first conductivity detection device, the second conductivity detection device, and the third conductivity detection device, so that the staff can directly obtain the values.

Description of drawings

FIG. 1 is a schematic structural diagram of the side where the cation exchange column of the installation plate of the boiler pipeline leak detection device is located.

Fig. 2 is a schematic view of the structure of the side where the degassing device of the installation plate of the boiler pipeline leak detection device is located.

Figure 3 is a schematic diagram of the overall connection structure of the boiler pipeline leak detection device.

FIG. 4 is a schematic structural diagram of the water-gas separator of the boiler pipeline leak detection device.

FIG. 5 is a schematic structural diagram of the water seal of the boiler pipeline leak detection device.

Fig. 6 is a control principle diagram of the controller of the boiler pipe leakage detection device.

Reference numerals: 1. Mounting plate; 101. Water receiving tank; 102. Drain pipe; 2. Pipeline; 3. First conductivity detection device; 4. Cation exchange column; 5. Second conductivity detection device; Gas device; 601, heat exchanger; 602, heater; 603, water gas separator; 6031, tank body; 6032, gas-liquid separation net; 6033, upper chamber; 6034, lower chamber; 6035, water inlet; 6036, air outlet; 6037, water outlet; 7, third conductivity detection device; 8, flow valve; 9, water pump; 10, flow meter; 11, water seal; 1101, water container; 1102, air inlet pipe; 1103, Outlet pipe; 15. Controller; 16. Display.

Detailed ways

The present application will be further described in detail below with reference to the accompanying drawings.

Referring to FIGS. 1 and 2 , a boiler pipeline leak detection device disclosed in the present application includes a mounting plate 1 , and a first conductivity detection device 3 and a cation exchange column 4 are fixedly arranged on the mounting plate 1 and are sequentially connected through the pipeline 2 . , a second conductivity detection device 5 , a degassing device 6 and a third conductivity detection device 7 . The specific connection structure principle diagram of the detection device is shown in FIG. 3 . The water sample in the boiler is passed into the pipeline 2, the first conductivity detection device 3 is used to first detect the initial hydrogen conductivity σ1 of the water sample, and a strong acid type cation resin is placed in the cation exchange column 4, which is used for the water sample. The cations are replaced by H+, the second conductivity detection device 5 is used to detect the hydrogen conductivity σ2 of the water sample after cation exchange, the degassing device 6 is used to remove the carbon dioxide gas dissolved in the water sample, and the third conductivity detection The device 7 is used to detect the degassed hydrogen conductivity σ3 of the water sample.

The cations such as Ga+ and Mg+ in the water can cause corrosion of the boiler. Calculate the difference between the hydrogen conductivity σ2 after cation exchange and the initial hydrogen conductivity σ1, that is, σ2-σ1=Δ1, Δ1 can reflect the content of cations in the boiler water, The higher the Δ1 value, the higher the cation content, the stronger the corrosive ability of boiler water to the boiler, and vice versa. Under the normal working state of the boiler, the hydrogen conductivity σ2 is required not to be higher than 0.20.06μS/cm. When the boiler is corroded and the furnace tube leaks, gas will enter the boiler water. Calculate the difference between the hydrogen conductivity σ2 after cation exchange and the degassed hydrogen conductivity σ3, that is, σ2-σ3=Δ2, Δ2 can reflect The content of carbon dioxide in the boiler water reflects the leakage of the boiler. Under the normal working state of the boiler, Δ2 is required not to exceed 0.06μS/cm.

1 and 2 , a flow valve 8 , a water pump 9 and a flow meter 10 are connected to the upstream pipeline 2 of the first conductivity detection device 3 in sequence. The water pump 9 is used to pump the water sample into the pipeline 2 of the detection device, the flow meter 10 is used to display the flow rate of the water sample, and the flow valve 8 is used to adjust the flow rate of the water sample. Insufficient, so the detection data is inaccurate, and the water sample flow rate is too small, which will lead to low detection efficiency.

Referring to FIG. 2, the degassing device 6 includes a heat exchanger 601, a heater 602 and a water-gas separator 603 connected in sequence through the pipeline 2. The water sample enters the heat exchanger 601 after passing through the second conductivity detection device 5, and then enters the The heater 602, the heater 602 heats the water sample to 100°C, so that the carbon dioxide gas in the water sample escapes, and then enters the water-gas separator 603 to separate the carbon dioxide escaping from the water sample.

4, the water-gas separator 603 includes a tank body 6031, and the tank body 6031 is provided with a gas-liquid separation net 6032. The gas-liquid separation net 6032 is a metal net, and the water sample can be spread on the gas-liquid separation net 6032. The contact area of air is conducive to the escape of carbon dioxide. The gas-liquid separation net 6032 divides the tank 6031 into an upper chamber 6033 and a lower chamber 6034. The top of the tank 6031 is provided with a water inlet 6035 and an air outlet 6036, and the water inlet 6035 and the air outlet 6036 communicate with the upper chamber 6033. The bottom of the tank body 6031 is provided with a water outlet 6037 , and the water outlet 6027 communicates with the lower chamber 6034 .

3, the water sample enters the upper chamber 6033 from the water inlet 6035 of the water-gas separator 603, then enters the lower chamber 6034 through the gas-liquid separation net 6032, and is discharged from the water outlet 6037, and the carbon dioxide gas escaped from the water sample Exhaust from the air outlet 6036. After the water sample passes through the water-gas separator 603, the temperature is still high, and the temperature needs to be lowered before entering the third conductivity detection device 7. The water outlet 6037 is connected to the heat exchanger 601 through the pipeline 2, and the high-temperature water sample is in the heat exchanger 601. Heat exchange with the water sample before entering the heater 602, the water sample can be preheated to 40°C-50°C before entering the heater 602, so that it can be quickly heated to 100°C in the heater 602, and the water sample leaves After the water-gas separator 603, the temperature can be lowered to 40°C-50°C in the heat exchanger 601 to reach the detection temperature required by the third conductivity detection device 7. The arrangement of the heat exchanger 601 not only realizes the preheating of the water sample, but also realizes the cooling of the water sample, which simplifies the equipment structure and saves energy.

2 and 5 , the air outlet 6036 of the water-gas separator 603 is connected with a water seal 11 , and the water seal 11 includes a water container 1101 , an air inlet pipe 1102 and an air outlet pipe 1103 , and the lower end of the air inlet pipe 1102 extends into the water container 1101 and Close to the bottom of the water container 1101, the upper end of the air inlet pipe 1102 protrudes from the top of the water container 1101, and is connected to the air outlet 6036 of the water-gas separator 603 through the pipe 2, and the lower end of the air outlet pipe 1103 is connected to the top of the water container 1101 and is not connected. Penetrate into the water container 1101, and the other end can be connected to the drainage pipe 2. The water container 1101 contains water that has not passed the lower end of the air inlet pipe 1102. The gas and water vapor discharged from the air outlet 6036 of the water gas separator 603 enter the water container 1101 from the air inlet pipe 1102, and are discharged through the water outlet pipe. The water container 1101 The accumulated water inside can prevent the outside air from being sucked back into the water-gas separator 603, which affects the efficiency of water-gas separation.

1 and 6, a controller 15 (not shown in the figure) and a display 16 are also mounted on the mounting plate 1. The controller 15 is connected to the first conductivity detection device 3, the second conductivity detection device 5, the third conductivity detection device 5, and the third conductivity detection device 3. The conductivity detection device 7 and the display 16 are connected. After the first conductivity detection device 3 , the second conductivity detection device 5 and the third conductivity detection device 7 detect the values of σ1, σ2 and σ3, a signal is sent to the controller 15 , the controller 15 then transmits a signal to the display 16, and the display 16 displays the values of σ1, σ2 and σ3, so that the staff can directly obtain the values.

1 and 2 , the mounting plate 1 is installed vertically, the flow meter 10 , the cation exchange column 4 , the first conductivity detection device 3 , the second conductivity detection device 5 , the third conductivity detection device 7 , and the controller 15 And the display 16 is fixedly connected to one side of the mounting plate 1, the flow valve 8, the water pump 9, the heat exchanger 601, the heater 602, the water-gas separator 603, the water seal 11 and most of the pipes 2 are fixedly connected to the mounting plate. 1 on the other side. A water receiving groove 101 is fixedly connected to the bottom of the mounting plate 1 . The water receiving groove 101 is arranged horizontally and is located on the side where most of the pipes 2 of the mounting plate 1 are located. The bottom of the water receiving groove 101 is connected with a drain pipe 102 . When the component on the mounting plate 1 on the side where the water receiving groove 101 is located leaks water, the water can drip into the water receiving groove 101 and be discharged through the drain pipe 102 .

The boiler pipeline leak detection device in the present application can continuously feed water samples to monitor the corrosion situation in the boiler in real time, and can also feed water samples at intervals for detection. During interval detection, the water sample should be passed in for a period of time to rinse the detection device, and then read the value on the display 16 to reduce the influence of the residual water sample in the previous detection on the current detection.

The embodiments of this specific embodiment are all preferred embodiments of the present application, and do not limit the protection scope of the present application accordingly. Therefore: all equivalent changes made according to the structure, shape and principle of the present application should be covered in within the scope of protection of this application.

Claims (9)

1. A boiler leakage detection device is characterized in that: comprises a first conductivity detection device (3), a cation exchange column (4), a second conductivity detection device (5), a degassing device (6) and a third conductivity detection device (7) which are connected in turn through a pipeline (2), the degassing device (6) comprises a heat exchanger (601), a heater (602) and a water-gas separator (603) which are sequentially connected through a pipeline (2), the water-gas separator (603) is connected to the heat exchanger (601) through a pipeline (2), the water sample output from the water-gas separator (603) and the water sample before entering the heater (602) are subjected to heat exchange in the heat exchanger (601), the first conductivity detection device (3) is used for detecting the initial hydrogen conductivity sigma 1, the second conductivity detection device (5) is used for detecting the hydrogen conductivity sigma 2 after cation exchange, and the third conductivity detection device (7) is used for detecting the degassed hydrogen conductivity sigma 3.

2. The boiler leak detecting apparatus according to claim 1, wherein: moisture separator (603) are including jar body (6031), be provided with gas-liquid separation net (6032) in jar body (6031), gas-liquid separation net (6032) with separate for last cavity (6033) and cavity of resorption (6034) in jar body (6031), seted up on jar body (6031) with go up water inlet (6035) and gas outlet (6036) of cavity (6033) intercommunication, and with delivery port (6037) of cavity (6034) intercommunication down, the water sample is followed water inlet (6035) gets into cavity of resorption (6033), then passes through gas-liquid separation net (6032) get into cavity of resorption (6034) and discharge from delivery port (6037), and gas in the water sample is separated in last cavity (6033) by gas-liquid separation net (6032) to discharge from gas outlet (6036).

3. The boiler leak detecting apparatus according to claim 2, wherein: and a gas outlet (6036) of the water-gas separator (603) is connected with a water seal (11).

4. The boiler leak detecting apparatus according to claim 1, wherein: and a water pump (9) is arranged on the upstream pipeline (2) of the first conductivity detection device (3).

5. The boiler leak detecting apparatus according to claim 1, wherein: and a flow valve (8) is arranged on an upstream pipeline (2) of the first conductivity detection device (3).

6. The boiler leak detecting apparatus according to claim 1, wherein: the upstream pipeline (2) of the first conductivity detection device (3) is provided with a flowmeter (10).

7. The boiler leak detecting apparatus according to claim 1, wherein: the cation exchange column (4) is filled with strong acid type cation resin.

8. The boiler leakage detecting apparatus according to any one of claims 1 to 7, wherein: the device is characterized by further comprising a controller (15) and a display (16), wherein the controller (15) is connected with the first conductivity detection device (3), the second conductivity detection device (5), the third conductivity detection device (7) and the display (16), the first conductivity detection device (3), the second conductivity detection device (5) and the third conductivity detection device (7) transmit signals to the controller (15), and the controller (15) transmits signals to the display (16).

9. The boiler leak detecting apparatus according to claim 8, wherein: first conductivity detection device (3), cation exchange column (4), second conductivity detection device (5) third conductivity detection device (7) controller (15) and the equal fixed connection in one side of mounting panel (1) in display (16), degasser (6) and most pipeline (2) are all fixed connection at the opposite side of mounting panel (1), mounting panel (1) bottom fixedly connected with water receiving tank (101), water receiving tank (101) are located mounting panel (1) one side at degasser (6) place, the tank bottom of water receiving tank (101) is connected with drain pipe (102).

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