Pipeline leakage monitoring device and boiler flue gas waste heat utilization system

Abstract

The utility model relates to a pipeline leakage monitoring device and a boiler flue gas waste heat utilization system.The pipeline leakage monitoring device comprises a water collector and a monitoring drainage pipe arranged at the lower end of the water collector, the water collector is used for receiving water drained by a condensation water drainage pipe, and a first trap is arranged on the monitoring drainage pipe; the first trap comprises a U-shaped lower turn and an inverted U-shaped upper turn, one end, far away from the upper turn, of the lower turn is communicated with the inner cavity of the water collector, the lowest part of the lower turn is lower than the inner bottom wall of the water collector, and the highest part of the inner bottom wall of the upper turn is higher than the inner bottom wall of the water collector; the end, away from the lower corner, of the upper corner extends below the lower corner. The water collector and the monitoring drain pipe are arranged, and the monitoring drain pipe is provided with the first trap, so that a certain amount of water can be retained in the water collector. A worker can judge whether the heat exchange pipeline leaks or not by observing the water amount in the water collector.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial boiler flue gas waste heat utilization, in particular to a pipeline leakage monitoring device and a boiler flue gas waste heat utilization system. BACKGROUND

[0002] Flue gas waste heat utilization is an important energy-saving and efficiency-increasing technology for industrial boilers. Through heat exchange between heat exchange medium in the heat exchange pipeline and flue gas, the heat of high-temperature flue gas is recycled and utilized. At present, the most widely used method is water and flue gas heat exchange. A heat exchanger is installed on the exhaust gas passage to exchange heat between flue gas and water without contact. However, once the heat exchange pipeline in the heat exchanger is damaged and leaks, it is difficult to detect, and the leaked water entering the boiler along the exhaust gas passage will cause great safety hazards. CONTENT OF THE UTILITY MODEL

[0003] Therefore, it is necessary to provide a pipeline leakage monitoring device and a boiler flue gas waste heat utilization system capable of monitoring whether the heat exchange pipeline leaks.

[0004] The present application provides a pipeline leakage monitoring device for monitoring the heat exchange pipeline of a boiler flue gas waste heat utilization system. The boiler flue gas waste heat utilization system comprises a condensate drainage pipe for draining condensed water on the heat exchange pipeline. The pipeline leakage monitoring device comprises a water collector and a monitoring drainage pipe arranged at the lower end of the water collector. The water collector is used to receive water drained by the condensate drainage pipe. The monitoring drainage pipe is provided with a first water trap. The first water trap comprises a lower elbow and an upper elbow connected in sequence. The lower elbow is in the shape of U. The upper elbow is in the shape of inverted U. One end of the lower elbow away from the upper elbow is in communication with the inner cavity of the water collector. The lowest part of the lower elbow is lower than the inner bottom wall of the water collector. The inner bottom wall of the highest part of the upper elbow is higher than the inner bottom wall of the water collector. One end of the upper elbow away from the lower elbow extends below the lower elbow.

[0005] In one embodiment, the top wall of the highest part of the upper elbow is provided with an anti-siphon hole.

[0006] In one embodiment, the inner cavity of the water collector has an upwardly arranged opening. The water collector is located below the water outlet end of the condensate drainage pipe.

[0007] In one embodiment, the water collector is in the shape of a funnel with a large upper part and a small lower part.

[0008] In one embodiment, the water outlet end of the condensate drainage pipe extends into the opening of the water collector.

[0009] In one embodiment, the inner wall of the water collector is provided with water level graduation lines.

[0010] In one of the embodiments, the water collector is provided with a water level sensor, the pipeline leakage monitoring device further comprises a controller and an alarm, the controller is in communication connection with the water level sensor and the alarm respectively, the water level sensor is used for detecting the water level in the water collector and sending a water level signal, the controller is used for receiving the water level signal sent by the water level sensor and judging whether the alarm needs to be triggered to send an alarm signal according to the water level signal.

[0011] The application further provides a boiler flue gas waste heat utilization system, comprising a boiler, a flue gas discharge passage, a heat exchanger and the above-mentioned pipeline detection device, the flue gas discharge passage is used for discharging flue gas generated by the boiler, the heat exchanger is arranged in the flue gas discharge passage, and the heat exchanger comprises a shell, a heat exchange pipeline arranged in the shell and a condensate water discharge pipe connected to the bottom of the shell, and the condensate water discharge pipe is used for discharging water received by the shell.

[0012] In one of the embodiments, a second water storage bend is arranged on the condensate water discharge pipe.

[0013] In one of the embodiments, the second water storage bend is arranged at the water outlet end of the condensate water discharge pipe.

[0014] Compared with the prior art, the pipeline leakage monitoring device and the boiler flue gas waste heat utilization system provided by the application can leave a certain amount of water in the water collector by arranging the water collector and the monitoring discharge pipe and arranging the first water storage bend on the monitoring discharge pipe. Since the amount of water collected in the water collector when the heat exchange pipeline leaks is obviously more than the amount of water collected when the heat exchange pipeline does not leak, the worker can determine whether the heat exchange pipeline leaks by observing the amount of water in the water collector. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort.

[0016] Figure 1 FIG. 1 is a structural schematic diagram of a boiler flue gas waste heat utilization system according to an embodiment of the application;

[0017] Figure 2 FIG. 2 is a partial enlarged view of position A in FIG. 1. Figure 1

[0018] ​100, pipeline leakage monitoring device; 110, water collector; 120, monitoring drain pipe; 130 first water trap; 131, lower elbow; 132, upper elbow; 1321, anti-siphon hole; 200, boiler; 300, flue gas passage; 400, heat exchanger; 410, shell; 420, heat exchange pipeline; 430, condensate drain pipe; 431, second water trap. DETAILED DESCRIPTION

[0019] In order to make the above objectives, features and advantages of the present application more clear and easily understood, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described and it is therefore contemplated to cover all such modifications as fall within the scope of the application. It should be noted that the specific embodiments of the present application can be carried out by not only the numerical examples given below but also other ways known to those skilled in the art without departing from the scope of the present application.

[0020] It should be noted that when a component is referred to as being "on" or "set on" another component, it can be directly on the other component or there can be a middle component. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or there can be a middle component. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions used in the description of the present application are for the purpose of illustration only and do not indicate the only orientation of the embodiments.

[0021] In addition, the terms "first", "second", and the like, are used only to describe and distinguish the elements in the embodiments, and do not indicate or imply a relative importance or a specific order of the elements. Thus, a feature defined with "first" or "second" can include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically defined and limited.

[0022] In the present application, unless otherwise specifically defined and limited, "on", "under", "above", and "over" of a first feature to a second feature can mean that the first feature is in direct contact with the second feature, or the first feature is indirectly in contact with the second feature through an intermediate medium. Moreover, "above", "over", and "on" of a first feature to a second feature can mean that the first feature is directly above or obliquely above the second feature, or only means that the first feature is horizontally higher than the second feature. "Below", "under", and "underneath" of a first feature to a second feature can mean that the first feature is directly below or obliquely below the second feature, or only means that the first feature is horizontally lower than the second feature.

[0023] Unless otherwise defined, all technical and scientific terms used in the application's specification are intended to have the same meaning as commonly understood by one of ordinary skill in the art to which the application pertains. The terminology used in the application's specification is for describing particular embodiments only and is not intended to be limiting of the application. The use of the terms "and / or" in the application's specification is intended to encompass all possibilities of combining one or more relevant items together.

[0024] Please refer to Figure 1 and Figure 2 , the application provides a pipeline leakage monitoring device 100 for monitoring the heat exchange pipeline 420 of the boiler flue gas waste heat utilization system, the boiler flue gas waste heat utilization system includes a condensate drainage pipe 430 for discharging the condensate water on the heat exchange pipeline 420. It can be understood that when the condensate water is generated on the heat exchange pipeline 420, the condensate water condenses on the outer wall of the heat exchange pipeline 420, and the condensate drainage pipe 430 can discharge the condensate water on the heat exchange pipeline 420, so when the heat exchange pipeline 420 leaks, the leaked water will also be discharged through the condensate drainage pipe 430.

[0025] In the application, the pipeline leakage monitoring device 100 includes a water collector 110 and a monitoring drainage pipe 120 arranged at the lower end of the water collector 110, the water collector 110 is used for receiving the water discharged by the condensate drainage pipe 430, and the monitoring drainage pipe 120 is provided with a first water trap, the first water trap includes a lower elbow 131 and an upper elbow 132 connected in sequence, the lower elbow 131 is in a U shape, and the upper elbow 132 is in an inverted U shape, one end of the lower elbow 131 away from the upper elbow 132 is communicated with the inner cavity of the water collector 110, the lowest part of the lower elbow 131 is lower than the inner bottom wall of the water collector 110, the inner bottom wall of the highest part of the upper elbow 132 is higher than the inner bottom wall of the water collector 110, and one end of the upper elbow 132 away from the lower elbow 131 extends to below the lower elbow 131. In this way, the first water trap is arranged to enable a certain amount of water to be retained in the water collector 110. Since the amount of condensate water generated by the heat exchange pipeline 420 is controlled within a certain range, when the heat exchange pipeline 420 leaks, the amount of water stored in the water collector 110 will be obviously more than the amount of condensate water. Moreover, the boiler flue gas waste heat utilization system will only generate condensate water on the outer wall of the heat exchange pipeline 420 when the system is working, and if there is water in the water collector 110 when the system is stopped, it indicates that the heat exchange pipeline 420 leaks. It can be seen that the amount of water collected in the water collector 110 when the heat exchange pipeline 420 leaks is obviously more than the amount of water when the heat exchange pipeline 420 does not leak, and therefore, the worker can determine whether the heat exchange pipeline 420 leaks by observing the amount of water in the water collector 110.

[0026] Further, the top wall of the highest part of the upper elbow 132 is provided with an anti-siphon hole 1321. In this way, by providing the anti-siphon hole 1321, the highest part of the upper elbow 132 is connected with the atmosphere, so that the water in the water collector 110 is not emptied due to siphon effect when the water amount in the water collector 110 is large, and a false water level is avoided. The anti-siphon hole 1321 can be a small hole, and the shape of the anti-siphon hole 1321 can be circular, square, oval, etc., which is not limited in the present application, as long as the anti-siphon hole 1321 can connect the inside of the upper elbow 132 with the atmosphere.

[0027] Further, the inner cavity of the water collector 110 has an upward opening, and the water collector 110 is located below the water outlet end of the condensate drain pipe 430. In this way, the water discharged from the condensate drain pipe 430 can directly fall into the inner cavity of the water collector 110, and at the same time, the user can directly observe the water level in the water collector 110 through the opening. This structure is very simple and convenient to use. Of course, in other embodiments, a visible window can also be provided on the water collector 110 to observe the water level in the water collector 110.

[0028] In the present embodiment, the water collector 110 has a funnel shape with a large upper part and a small lower part. In this way, the structure is very simple, and such a shape is convenient for collecting the water discharged from the condensate drain pipe 430, and is also convenient for personnel to observe the change of the water level of the small amount of water in the water collector 110, so that it is easier to determine whether the heat exchange pipeline 420 leaks.

[0029] Further, the water outlet end of the condensate drain pipe 430 extends into the opening of the water collector 110. In this way, the water discharged from the condensate drain pipe 430 can be prevented from splashing out of the water collector 110, so as to ensure that personnel can make accurate judgments according to the water level in the water collector 110.

[0030] Further, the inner wall of the water collector 110 is provided with water level scale lines. In this way, it is convenient for personnel to observe the water level in the water collector 110, so as to make accurate judgments.

[0031] Further, the water collector 110 is provided with a water level sensor, and the pipeline leakage monitoring device 100 further comprises a controller and an alarm, the controller being in communication connection with the water level sensor and the alarm respectively, the water level sensor being configured to detect the water level in the water collector 110 and send a water level signal, and the controller being configured to receive the water level signal sent by the water level sensor and determine whether the alarm needs to be triggered to send an alarm signal according to the water level signal. In this way, by providing the sensor, the controller and the alarm, an alarm signal can be sent when the water level in the water collector 110 exceeds a threshold value, realizing automatic monitoring of the water level, and personnel can know whether the heat exchange pipeline 420 leaks without observing the water level in the water collector 110, so that the leakage can be handled more timely.

[0032] Further, referring to Figure 1 and Figure 2 , the application also provides a boiler flue gas waste heat utilization system, comprising a boiler 200, a flue gas discharge passage 300, a heat exchanger 400 and the above-mentioned pipeline detection device, the flue gas discharge passage 300 being configured to discharge flue gas generated by the boiler 200, and the heat exchanger 400 being arranged in the flue gas discharge passage 300. The heat exchanger 400 comprises a shell 410, heat exchange pipelines 420 arranged in the shell 410 and a condensate water discharge pipe 430 connected to the bottom of the shell 410, the condensate water discharge pipe 430 being configured to discharge water received by the shell 410. In this way, the heat exchange pipelines 420 are filled with circulating water, and the circulating water exchanges heat with flue gas in the flue gas discharge passage 300, so as to recycle the waste heat of the flue gas. The shell 410 can receive condensate water generated by the heat exchange pipelines 420 and water flowing out of the heat exchange pipelines 420 when the heat exchange pipelines 420 leak, and discharge the water through the condensate water discharge pipe. The boiler flue gas waste heat utilization system can collect the water discharged by the condensate water discharge pipe by using the above-mentioned pipeline detection device. Since the amount of water collected in the water collector 110 when the heat exchange pipelines 420 leak is obviously more than the amount of water collected in the water collector 110 when the heat exchange pipelines 420 do not leak, personnel can determine whether the heat exchange pipelines 420 leak by observing the amount of water in the water collector 110.

[0033] Further, the condensate water discharge pipe 430 is provided with a second water trap 431. In this way, flue gas in the flue gas discharge passage 300 can be prevented from being discharged through the condensate water discharge pipe 430. The structure of the second water trap 431 is similar to that of the first water trap, and will not be described again.

[0034] In this embodiment, the second water trap 431 is arranged at the water outlet end of the condensate water discharge pipe 430. In this way, the distance between the second water trap 431 and the water collector 110 is short, so as to reduce the splashing of water discharged by the condensate water discharge pipe 430.

[0035] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, it is to be understood that the application embraces all such possible combinations.

[0036] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, some modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A pipeline leakage monitoring device for monitoring heat exchange pipelines in a boiler flue gas waste heat utilization system, wherein the boiler flue gas waste heat utilization system includes a condensate drain pipe for discharging condensate from the heat exchange pipelines. Its features are, The pipeline leakage monitoring device includes a water collector and a monitoring drain pipe located at the lower end of the water collector. The water collector is used to collect water discharged from the condensate drain pipe. The monitoring drain pipe is provided with a first water trap, which includes a lower bend and an upper bend connected in sequence. The lower bend is U-shaped, and the upper bend is inverted U-shaped. The end of the lower bend away from the upper bend is connected to the inner cavity of the water collector, and the lowest point of the lower bend is lower than the inner bottom wall of the water collector. The inner bottom wall of the highest point of the upper bend is higher than the inner bottom wall of the water collector. The end of the upper bend away from the lower bend extends below the lower bend.

2. The pipeline leakage monitoring device according to claim 1, characterized in that, The top wall at the highest point of the upward bend is provided with an anti-siphon hole.

3. The pipeline leakage monitoring device according to claim 1, characterized in that, The water collector has an upward-facing opening in its inner cavity, and is located below the outlet end of the condensate drain pipe.

4. The pipeline leakage monitoring device according to claim 3, characterized in that, The water collector is funnel-shaped, wider at the top and narrower at the bottom.

5. The pipeline leakage monitoring device according to claim 3, characterized in that, The outlet end of the condensate drain pipe extends into the opening of the water collector.

6. The pipeline leakage monitoring device according to claim 3, characterized in that, The water collector has water level markings on its inner wall.

7. The pipeline leakage monitoring device according to claim 1, characterized in that, The water collector is equipped with a water level sensor. The pipeline leakage monitoring device also includes a controller and an alarm. The controller is communicatively connected to the water level sensor and the alarm. The water level sensor is used to detect the water level in the water collector and send a water level signal. The controller is used to receive the water level signal sent by the water level sensor and determine whether the alarm needs to be triggered to send an alarm signal based on the water level signal.

8. A boiler flue gas waste heat utilization system, characterized in that, The system includes a boiler, a flue gas duct, a heat exchanger, and a pipeline leakage monitoring device as described in any one of claims 1-7. The flue gas duct is used to discharge the flue gas generated by the boiler. The heat exchanger is disposed in the flue gas duct. The heat exchanger includes a shell, a heat exchange pipe disposed in the shell, and a condensate drain pipe connected to the bottom of the shell. The condensate drain pipe is used to discharge the water collected by the shell.

9. The boiler flue gas waste heat utilization system according to claim 8, characterized in that, The condensate drain pipe is equipped with a second trap.

10. The boiler flue gas waste heat utilization system according to claim 9, characterized in that, The second water trap is located at the outlet end of the condensate drain pipe.

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