Combined monitoring system for leakage of ascension pipe heat exchanger of coke oven

Abstract

The utility model discloses a combined monitoring system for leakage of a coke oven riser heat exchanger, which comprises a raw gas temperature measuring module, a carbonization chamber pressure measuring module, a U-shaped pipe, a water outlet branch pipe temperature measuring module and a control display terminal. The water outlet temperature of the riser heat exchanger is monitored through the arranged water outlet branch pipe temperature measurement module, and on the basis of observation of the U-shaped pipe and the water outlet branch pipe temperature measurement module, whether monitoring data of the raw gas temperature measurement module and the carbonization chamber pressure measurement module are abnormal at the same time or not is observed; whether the heat exchanger leaks or not can be judged more accurately and scientifically, and faults can be found in time.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchanger monitoring. More specifically, the utility model relates to a combined monitoring system for the leakage of a coke oven riser pipe heat exchanger. Background Technique

[0002] The waste heat recovery system of the coke oven riser pipe utilizes part of the sensible heat of the raw coke oven gas to produce saturated steam or superheated steam, reducing the gas consumption for steam production and the ammonia water circulation for cooling the raw coke oven gas, thereby achieving the purpose of energy conservation and carbon reduction. The riser pipe heat exchanger has gradually developed from the previous jacket type that can only produce low-pressure steam to the current mainstream stage of external coil heat exchangers that can produce low, medium, and high-pressure steam.

[0003] While the installation of this system in the coke oven brings good economic and environmental benefits, there are also certain safety risks. Since the riser pipe heat exchanger is installed on the top of the coke oven carbonization chamber, the heated medium in the heat exchanger is generally a steam-water mixture. Once it leaks, especially when it leaks into the carbonization chamber, it will cause the furnace body silica bricks to be damaged due to sudden cooling, seriously threatening the safe operation of the coke oven.

[0004] To monitor the leakage problem of the heat exchanger, currently, temperature measuring devices are set on the surface of the heat exchanger or the outlet water branch pipe to detect the temperature change of the heat exchanger surface or the outlet water branch pipe temperature, and then monitor whether the heat exchanger leaks. The defect of these setting methods is that for monitoring the surface temperature of the heat exchanger, because the temperature of the steam-water mixture drops rapidly with the decrease of pressure after leakage, and the surface temperature of the heat exchanger is already 60 - 100 °C due to the baking of the coke oven furnace body, so even if leakage occurs, its surface temperature does not change significantly. For monitoring the temperature of the outlet water branch pipe, since the leakage inside the heat exchanger body does not significantly affect the steam-water pressure of the outlet water branch pipe (unless the leakage amount is huge), its temperature change is not obvious either.

[0005] For the coil heat exchanger, the general conventional monitoring method is to set a U-shaped pipe at the lower part of the heat exchanger body that can lead out the leaked steam-water mixture. Usually, a small amount of high-temperature heat-conducting oil is poured for sealing. Once the heat exchanger leaks, the steam-water mixture can be led out in time. However, the problem is that if the heat exchanger leaks to the carbonization chamber side, this device cannot drain the steam-water mixture in time, and the furnace top operator cannot find the abnormality in time and thus cannot detect the fault in time. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a combined monitoring system for the leakage of a coke oven riser pipe heat exchanger to solve the technical problems of single leakage monitoring means and low judgment accuracy of the existing technology for the riser pipe heat exchanger.

[0007] To achieve these objects and other advantages according to the present utility model, a combined monitoring system for leakage of a rising pipe heat exchanger in a coke oven is provided, including:

[0008] A raw gas temperature measurement module, which is installed on the bridge pipe and is used to measure the temperature of the raw gas at the bridge pipe;

[0009] A carbonization chamber pressure measurement module, which is installed on the base above the raw gas outlet of the coke oven body and is used to measure the pressure in the carbonization chamber;

[0010] A U-shaped pipe, one end of which is connected and arranged at the lower part of the heat exchange interlayer of the rising pipe heat exchanger. A liquid medium is filled in the U-shaped pipe for liquid seal, and the other end is used to discharge the steam-water mixture when the rising pipe heat exchanger leaks;

[0011] An outlet branch pipe temperature measurement module, which is arranged on the outlet branch pipe of the rising pipe heat exchanger;

[0012] A control and display terminal, which is communicatively connected with the raw gas temperature measurement module, the carbonization chamber pressure measurement module, and the outlet branch pipe temperature measurement module, and is used to display the received measurement data.

[0013] Preferably, an alarm is further included, and the alarm is electrically connected to the control and display terminal.

[0014] Preferably, the outlet branch pipe of the rising pipe heat exchanger is connected to a steam drum through a pipeline, the steam drum is connected to a forced circulation pump through a pipeline, and the forced circulation pump is connected to the inlet branch pipe of the rising pipe heat exchanger through a pipeline to form a circulating water system. A circulating water volume monitoring module is arranged on the pipeline, and a steam drum liquid level monitoring module and a steam drum pressure monitoring module are arranged on the steam drum. The circulating water volume monitoring module, the steam drum liquid level monitoring module, and the steam drum pressure monitoring module are respectively communicatively connected with the control and display terminal.

[0015] Preferably, at one end of the U-shaped pipe for discharging the steam-water mixture, it is vertically arranged and fixedly connected with a bearing plate on the outside. A receiving tray is arranged on the bearing plate. The receiving tray is sleeved on the end of the U-shaped pipe and is slidably connected with the end of the U-shaped pipe, and is used to receive the liquid medium overflowing from the U-shaped pipe. A weighing module for monitoring the weight change on the receiving tray is arranged between the bearing plate and the receiving tray, and the weighing module is communicatively connected with the control and display terminal.

[0016] The utility model has at least the following beneficial effects: The combined monitoring system for leakage of the coke oven riser pipe heat exchanger of the utility model includes a raw gas temperature measurement module, a carbonization chamber pressure measurement module, a U-shaped pipe, an outlet branch pipe temperature measurement module, and a control and display terminal. By observing whether there is a steam-water mixture discharged outward through the provided U-shaped pipe, and monitoring the outlet water temperature of the riser pipe heat exchanger through the provided outlet branch pipe temperature measurement module, based on the observations of the U-shaped pipe and the outlet branch pipe temperature measurement module, by observing whether the monitoring data of the raw gas temperature measurement module and the carbonization chamber pressure measurement module simultaneously show abnormalities, it is possible to more accurately and scientifically judge whether the heat exchanger leaks and discover faults in a timely manner.

[0017] Other advantages, objectives, and features of the present utility model will be partially reflected by the following description and partially understood by those skilled in the art through research and practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a connection structure diagram of the present utility model;

[0019] Figure 2 It is a schematic structural diagram of the present utility model arranged on a coke oven;

[0020] Figure 3 It is a schematic structural diagram of a bearing plate of an embodiment of the present utility model.

[0021] Description of the reference numerals in the drawings: 1. U-shaped pipe, 2. Bearing plate, 3. Weighing module, 4. Receiving tray. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following further describes the present utility model in detail with reference to the drawings, so that those skilled in the art can implement it according to the description in the specification.

[0023] In the description of the present utility model, the orientation or positional relationship indicated by the terms "horizontal", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0024] As Figure 1 、 Figure 2 、 Figure 3 shown, the combined monitoring system for leakage of the coke oven riser pipe heat exchanger of the present utility model includes:

[0025] The raw gas temperature measurement module is installed on the bridge pipe and is used to measure the raw gas temperature at the bridge pipe;

[0026] The carbonization chamber pressure measurement module is installed on the base above the raw gas outlet of the coke oven furnace body and is used to measure the pressure in the carbonization chamber;

[0027] U-shaped pipe 1, one end of which is connected and arranged at the lower part of the heat exchange interlayer of the riser heat exchanger. A liquid medium is filled in the U-shaped pipe for liquid seal, and the other end is used to discharge the steam-water mixture when the riser heat exchanger leaks;

[0028] The outlet branch pipe temperature measurement module is arranged on the outlet branch pipe of the riser heat exchanger;

[0029] The control and display terminal is communicatively connected to the raw gas temperature measurement module, the carbonization chamber pressure measurement module, and the outlet branch pipe temperature measurement module, and is used to display the received measurement data.

[0030] Figure 2 At point T in [] is the raw gas temperature measurement module, and at point P is the carbonization chamber pressure measurement module. Generally, the raw gas export equipment of the coke oven includes riser pipes, bridge pipes, single regulating valves, collecting pipes, suction pipes and their auxiliary equipment. A heat exchanger is arranged on the riser pipe. By setting the raw gas temperature measurement module and the carbonization chamber pressure measurement module, and comprehensively based on the monitoring results of the U-shaped pipe and the outlet branch pipe temperature measurement module and the experience of technicians and setting their respective data thresholds, it is comprehensively judged whether the heat exchanger leaks. Observe the data displayed on the control and display terminal. The U-shaped pipe is used to judge whether there is steam-water mixture discharged, and the outlet branch pipe temperature measurement module monitors whether the outlet water temperature increases abnormally. The raw gas temperature measurement module monitors that the raw gas temperature is lower than that during normal operation. By setting a temperature threshold, if it is lower than the set range during normal operation, it is judged that the heat exchanger leaks. The carbonization chamber pressure measurement module judges that the heat exchanger leaks when the monitored pressure value suddenly increases abnormally.

[0031] If the monitoring results of the raw gas temperature measurement module and the carbonization chamber pressure measurement module both exceed the data threshold and data anomalies occur, it is considered that the heat exchanger must have leaked. The specific monitoring principle is as follows:

[0032] First, when the steam-water mixture leaks into the interlayer formed by the inner and outer cylinders of the heat exchanger at the heat exchanger coil, at this time, steam-water mixture can be observed to discharge outward from the U-shaped tube. On the premise that the U-shaped tube is in this monitoring state, when the leakage rate is large and the water filling volume in the interlayer is large, the heat exchange capacity of the heat exchanger is improved to some extent, and the temperature of the raw coal gas measured by the raw coal gas temperature measurement module will be lower than that during normal operation and lower than the set temperature threshold, it is judged that the heat exchanger leaks. Second, when a fault occurs in the inner cylinder of the heat exchanger (such as cracks appearing in various welds), resulting in the steam-water mixture flowing into the carbonization chamber, at this time, the steam will directly contact and mix with the high-temperature raw coal gas and be vaporized by heat, which will cause a large amount of the heat of the raw coal gas itself to be absorbed and its temperature to decrease significantly. At this time, no steam-water mixture is observed to discharge outward from the U-shaped tube, and both the raw coal gas temperature measurement module and the outlet branch pipe temperature measurement module monitor a temperature decrease and the temperature monitoring data of the raw coal gas temperature measurement module is lower than the set temperature threshold.

[0033] The pressure in the carbonization chamber is generated by the existence and flow of the raw coal gas. When the steam-water mixture of the heat exchanger leaks and flows into the carbonization chamber, due to contact and mixing with the high-temperature raw coal gas and being vaporized by heat, the volume of the raw coal gas will increase rapidly, which will further cause the pressure in the carbonization chamber to increase abnormally, making the pressure data collected by the carbonization chamber pressure measurement module exceed the set pressure threshold.

[0034] The combined monitoring system for the leakage of the riser heat exchanger of the present utility model includes a raw coal gas temperature measurement module, a carbonization chamber pressure measurement module, a U-shaped tube, an outlet branch pipe temperature measurement module, and a control and display terminal. By observing whether there is steam-water mixture discharging outward through the set U-shaped tube, and monitoring the outlet water temperature of the riser heat exchanger through the set outlet branch pipe temperature measurement module, based on the observations of the U-shaped tube and the outlet branch pipe temperature measurement module, by observing whether the monitoring data of the raw coal gas temperature measurement module and the carbonization chamber pressure measurement module simultaneously show abnormalities, it is possible to more accurately and scientifically judge whether the heat exchanger leaks and discover faults in a timely manner.

[0035] In another technical solution, as Figure 1 shown, it further includes an alarm, and the alarm is electrically connected to the control and display terminal. By connecting and setting the alarm, an alarm threshold can be set in the control and display terminal. As long as the received monitoring data exceeds the threshold range, a signal is sent to the alarm, and the alarm emits an alarm.

[0036] In another technical solution, as Figure 1As shown, the water outlet branch pipe of the riser heat exchanger is connected to the steam drum through a pipeline. The steam drum is connected to the forced circulation pump through a pipeline, and the forced circulation pump is connected to the water inlet branch pipe of the riser heat exchanger through a pipeline to form a circulating water system. A circulating water volume monitoring module is provided on the pipeline, and a steam drum liquid level monitoring module and a steam drum pressure monitoring module are provided on the steam drum. The circulating water volume monitoring module, the steam drum liquid level monitoring module, and the steam drum pressure monitoring module are respectively communicatively connected to the control and display terminal.

[0037] The steam drum, the forced circulation pump, the riser heat exchanger, and the connecting pipelines therebetween form a circulating water system, whose function is to be responsible for heat exchange with the raw coke oven gas produced, carry out heat, produce steam, and then supply the steam to external users after steam-water separation in the steam drum.

[0038] The riser waste heat control system has several control and detection functions to ensure the normal and automatic operation of the whole system. The detection modules related to the leakage detection function are: the circulating water volume monitoring module, the steam drum liquid level monitoring module, and the steam drum pressure monitoring module.

[0039] The steam drum liquid level is the basic prerequisite for the operation of the circulating water system. Without liquid level, the system cannot operate. The circulating water volume is a main monitoring index for whether the circulating water system circulates normally.

[0040] The saturated temperature of water corresponding to the steam drum pressure can be calculated through the steam drum pressure, and this temperature is used to assist in judging the normal value range of the outlet temperature of the riser heat exchanger. For example, when the steam drum pressure = 1 MPa, the saturated temperature of the corresponding water is 184 °C, then the normal value of the heat exchanger outlet temperature should be in the range of 184 ± 10 °C.

[0041] The outlet temperature of the riser heat exchanger detected by the raw coke oven gas temperature measurement module can be used to jointly judge whether the circulating water volume of the detected heat exchanger is normal. If the outlet temperature of the riser heat exchanger is too small, it means that the circulating water volume of this heat exchanger is abnormal, and there may be faults such as blockage, poor circulation, and leakage. By combining the T and P signals corresponding to the raw coke oven gas temperature measurement module and the carbonization chamber pressure measurement module, the type of fault can be specifically judged. For example, if the T value rises and the P value has no obvious change, it is blockage or poor circulation; if the T value drops and the P value has no obvious change, it is leakage but not internally leaked into the carbonization chamber; if the T value drops and the P value increases, it is leakage and internally leaked into the carbonization chamber.

[0042] In another technical solution, such as Figure 1 、 3As shown, a bearing plate 2 is vertically arranged at one end of the U-shaped tube 1 for discharging the steam-water mixture, and is fixedly connected to the outside. A receiving tray 4 is arranged on the bearing plate. The receiving tray 4 is sleeved on the end of the U-shaped tube 1 and is slidably connected to the end of the U-shaped tube 1 for receiving the liquid medium overflowing from the U-shaped tube 1. A weighing module 3 for monitoring the weight change on the receiving tray is arranged between the bearing plate 2 and the receiving tray 4. The weighing module 3 is communicatively connected to the control display terminal.

[0043] The receiving tray receives the overflowing liquid medium, avoiding safety accidents caused by the overflow of high-temperature liquid medium. By checking the data change of the weighing module at the control display terminal, it is possible to know the situation of the liquid medium falling into the receiving tray, so as to obtain the situation of the steam-water mixture discharging outward at the U-shaped tube, facilitating the staff to observe whether there is any abnormality in the pressure inside the heat exchanger interlayer.

[0044] Although the embodiments of the present invention have been disclosed above, it is not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the drawings shown and described here.

Claims

1. A joint monitoring system for leakage of coke oven riser heat exchanger, characterized in that: include: A raw gas temperature measurement module is installed on the bridge pipe and is used to measure the raw gas temperature at the bridge pipe; The carbonization chamber pressure measurement module is installed on the base above the raw gas outlet of the coke oven body and is used to measure the pressure in the carbonization chamber; A U-shaped tube, one end of which is connected to the lower part of the heat exchange interlayer of the riser heat exchanger, the liquid seal in the U-shaped tube is filled with liquid medium, and the other end is used to guide the steam-water mixture out when the riser heat exchanger leaks; A water outlet branch pipe temperature measurement module, which is arranged on the water outlet branch pipe of the riser heat exchanger; The control display terminal is connected in communication with the raw gas temperature measurement module, the carbonization chamber pressure measurement module, and the outlet branch pipe temperature measurement module, and is used to display the received measurement data.

2. The combined monitoring system for leakage of coke oven riser heat exchanger according to claim 1, characterized in that: It also includes an alarm, which is electrically connected to the control and display terminal.

3. The combined monitoring system for leakage of coke oven riser heat exchanger according to claim 1, characterized in that: The water outlet branch of the riser heat exchanger is connected to the steam drum through a pipeline, the steam drum is connected to the forced circulation pump through a pipeline, and the forced circulation pump is connected to the water inlet branch of the riser heat exchanger through a pipeline to form a circulating water system. A circulating water volume monitoring module is provided on the pipeline, and a steam drum liquid level monitoring module and a steam drum pressure monitoring module are provided on the steam drum. The circulating water volume monitoring module, the steam drum liquid level monitoring module and the steam drum pressure monitoring module are respectively communicatively connected to the control and display terminal.

4. The combined monitoring system for leakage of coke oven riser heat exchanger according to claim 1, characterized in that: A carrying plate is vertically arranged at one end of the U-shaped tube for discharging the soda-water mixture and is fixedly connected to the outside. A receiving tray is arranged on the carrying plate. The receiving tray is sleeved on the end of the U-shaped tube and is slidably connected to the end of the U-shaped tube for receiving the liquid medium overflowing from the U-shaped tube. A weighing module for monitoring the weight change on the receiving tray is arranged between the carrying plate and the receiving tray, and the weighing module is communicatively connected to the control and display terminal.

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