Steam metering system
By setting up monitoring pipe sections, expansion bends and shut-off valves in the inspection wells in the steam user area outside the thermal power plant, combined with the drainage system and the metering monitoring system, real-time monitoring and control of steam flow, temperature and pressure is achieved, solving the problem of the inability to monitor steam status in real time in the existing technology, and improving the safety management and automation of pipelines.
Patent Information
- Application Number
- CN202421718475.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-19
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-07-19
AI Technical Summary
The steam status parameters of the existing steam supply user area outside the existing thermal power plant cannot be monitored in real time, resulting in meter failure and steam main pipe status that cannot be monitored in time, affecting pipeline safety.
Design a steam metering system, including inspection wells, steam main pipes, hydrophobic systems and metering monitoring systems. The system realizes real-time monitoring and control of steam flow, temperature and pressure by setting up monitoring pipe sections, expansion bends and shut-off valves in the inspection well, combined with a drainage system and a metering monitoring system.
Real-time monitoring of steam conveying status and usage is realized, improving the safety management of steam pipelines by thermal power plants and the degree of automation of hydrophobic devices, and reducing the risk of manual operation.
Smart Images
Figure CN222993758U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of steam metering, and more specifically, relates to a steam metering system. Background Technique
[0002] For the external steam user area of existing thermal power plants, the ownership of the flow settlement meter belongs to the users. The thermal power plant cannot monitor the steam state parameters of external steam users in real time. It is necessary for the employees of the thermal power plant to regularly inspect and read the meters of external steam users. During the inspection and meter reading cycle, the thermal power plant cannot timely and accurately grasp the meter failure and the real-time state of the steam main pipe.
[0003] During the flow of steam in the pipeline, its temperature will continuously decrease and the water content will continuously increase, especially for the pipeline transporting saturated steam. If the condensate water in the steam pipeline cannot be discharged in time, water hammer phenomenon is likely to occur during the steam supply process, affecting the pipeline safety. At present, the start of the drainage device mainly relies on manual on-site operation for manual drainage, with a large number of personnel, heavy manual workload, and low automation level; moreover, the thermal power plant cannot effectively monitor the real-time operation state of the drainage device. Content of the Utility Model
[0004] The purpose of the utility model is to provide a steam metering system, aiming to realize the real-time monitoring of the steam transportation state and steam consumption.
[0005] To achieve the above purpose, the technical solution adopted by the utility model is: to provide a steam metering system, including an inspection well, a steam main pipe, a drainage system, and a metering and monitoring system; the steam main pipe includes a monitoring pipe section that horizontally penetrates the inspection well, and an expansion bend and a stop valve are arranged in the middle of the monitoring pipe section; the drainage system is arranged on both sides of the expansion bend, and a regulating valve is arranged on the drainage system; the metering and monitoring system includes an instrument monitoring sub-system and an instrument control sub-system. The instrument monitoring sub-system includes a flow meter, a temperature sensing device, and a pressure sensing device arranged on the expansion bend; the instrument control sub-system is electrically connected to the instrument monitoring sub-system, the stop valve, and the regulating valve.
[0006] As another embodiment of this application, the drainage system includes a drainage pipe group arranged on the monitoring pipe section and a water collection device arranged at the bottom of the inspection well. The drainage pipe group includes a first drainage pipe arranged downstream of the expansion bend and two second drainage pipes respectively arranged on both sides of the stop valve; the output ends of the first drainage pipe and the two second drainage pipes are both communicated with the water collection device; the regulating valve is arranged on both the first drainage pipe and the second drainage pipe.
[0007] As another embodiment of this application, both the first drainage pipe and the second drainage pipe are communicated with the monitoring pipe section by means of steam drain valves.
[0008] As another embodiment of the present application, U-shaped water traps are provided on both the first drain pipe and the second drain pipe; the top end of the U-shaped water trap is lower than the lowest point of the monitored pipe section.
[0009] As another embodiment of the present application, an exhaust pipe is provided at the highest point downstream of the U-shaped water trap.
[0010] As another embodiment of the present application, the water collection device includes a sump or a water collection tank. A liquid level measuring device and a submersible pump are provided in the sump; a drain pump is connected to the drain pipe in the water collection tank.
[0011] As another embodiment of the present application, a filter screen and a preheating pipe are provided in the water collection tank, and the preheating pipe is spirally arranged in the inner cavity of the water collection tank.
[0012] As another embodiment of the present application, an emptying pipe is provided at the upper end of the water collection tank, and the emptying pipe is located on one side of the outlet end of the preheating pipe.
[0013] As another embodiment of the present application, the metering and monitoring system includes a control cabinet and a power supply device. The control cabinet is provided on one side of the inspection well. The instrument control sub-system is located in the control cabinet. The instrument control sub-system includes a flow integrator, a payment management system device and a power supply device that are connected to each other. The power supply device is used to supply power to the flow integrator and the payment management system device; the flow integrator is electrically connected to the flow meter and the stop valve; the power supply device is located outside the control cabinet and is electrically connected to the power supply device.
[0014] As another embodiment of the present application, the metering and monitoring system further includes a monitoring device, and the monitoring device is provided on one side of the inspection well.
[0015] The beneficial effects of the steam metering system provided by the present utility model are as follows: Compared with the prior art, in the steam metering system of the present utility model, an inspection well is provided on the side of the steam supply pipe close to the thermal power plant, and an expansion bend and a stop valve are provided on the monitored pipe section located in the inspection well to control the on-off state of the steam supply pipe; the hydrophobic systems on both sides of the expansion bend are used to drain the condensed water in the steam main pipe, and the regulating valve can adjust the opening and closing of the hydrophobic system; the instrument monitoring sub-system is used to measure the steam temperature, pressure and flow values of the monitored pipe section, and transmit the above values to the instrument control sub-system, and the instrument control sub-system controls the opening and closing of the stop valve and the regulating valve. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] To more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0017] Figure 1 The structural schematic diagram of the steam metering system provided by the first embodiment of the present utility model;
[0018] Figure 2 The structural schematic diagram of the steam metering system provided by the second embodiment of the present utility model;
[0019] Figure 3 The structural schematic diagram of the water collection tank provided by the second embodiment of the present utility model.
[0020] In the figure: 1, monitoring pipe section; 2, globe valve; 3, expansion bend; 4, flowmeter; 5, first drain pipe; 6, second drain pipe; 7, sump pit; 8, control cabinet; 9, antenna; 10, flow integrator; 11, intelligent prepayment system; 12, UPS uninterruptible power supply system; 13, solar energy storage inverter charging protection system; 14, solar power supply system; 15, video monitoring equipment; 16, U-shaped water seal; 17, exhaust pipe; 18, main drain pipe; 19, water collection tank; 20, preheating pipeline; 21, drain pipe. Detailed implementation manners
[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model more clear and understandable, the following further details the present utility model in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.
[0022] Please refer to Figures 1 to 3 , and now the steam metering system provided by the present utility model will be described. The steam metering system includes an inspection well, a steam main pipe, a drain system and a metering and monitoring system; the steam main pipe includes a monitoring pipe section 1 that horizontally penetrates the inspection well, and an expansion bend 3 and a globe valve 2 are arranged in the middle of the monitoring pipe section 1; the drain system is arranged on both sides of the expansion bend 3, and a regulating valve is arranged on the drain system; the metering and monitoring system includes an instrument monitoring sub-system and an instrument control sub-system. The instrument monitoring sub-system includes a flowmeter 4, a temperature sensing device and a pressure sensing device arranged on the expansion bend 3; the instrument control sub-system is electrically connected to the instrument monitoring sub-system, the globe valve 2 and the regulating valve.
[0023] The steam metering system provided by the utility model, compared with the prior art, has an inspection well arranged on the side of the steam supply pipeline close to the thermal power plant. An expansion bend 3 and a stop valve 2 are arranged on the monitoring pipe section 1 located in the inspection well to control the on-off state of the steam supply pipeline. The drain systems on both sides of the expansion bend 3 are used to drain the condensed water in the steam main pipe, and the regulating valve can adjust the opening and closing of the drain system. The instrument monitoring subsystem is used to measure the steam temperature, pressure and flow rate values of the monitoring pipe section 1 and transmit the above values to the instrument control subsystem, and the instrument control subsystem controls the opening and closing of the stop valve 2 and the regulating valve.
[0024] Specifically, in the instrument control subsystem, there is a flow integrator 10. The flow integrator 10 realizes functions such as temperature access, pressure access, flow access, temperature and pressure compensation, etc. The flow integrator 10 cooperates with a flow meter 4 to monitor the steam volume passing through the monitoring pipe section 1. Correspondingly, the expansion bend 3 is a U-shaped structure protruding upwards, and a flow meter 4 is installed on the horizontal section of the expansion bend 3. The flow meter 4 can be a vortex flow meter 4, and the vortex flow meter 4 is configured in a supporting manner with the flow integrator 10.
[0025] A stop valve 2 is installed on the upstream horizontal section of the U-shaped expansion bend 3. The stop valve 2 can be an electric stop valve 2. A pressure instrument and a temperature instrument are installed on the upstream riser section of the expansion bend 3 and connected to the flow integrator 10.
[0026] In some possible embodiments, please refer to Figure 1 , the drain system includes a drain pipe group arranged on the monitoring pipe section 1 and a water collection device arranged at the bottom of the inspection well. The drain pipe group includes a first drain pipe 5 arranged downstream of the expansion bend 3 and two second drain pipes 6 respectively arranged on both sides of the stop valve 2. The output ends of the first drain pipe 5 and the two second drain pipes 6 are both connected to the water collection device. A regulating valve is arranged on both the first drain pipe and the second drain pipe 6.
[0027] The first drain pipe 5 and the second drain pipe 6 of the drain system are connected to the lowest point of the monitoring pipe section 1. The first drain pipe 5 and the second drain pipe 6 need to be distributed on both sides of the expansion bend 3. Among them, the first drain pipe 5 is located downstream of the expansion bend 3 to drain the condensed water in the downstream horizontal section of the expansion bend 3; the second drain pipe 6 is located in the upstream section of the expansion bend 3 to drain the condensed water in the upstream horizontal section of the expansion bend 3. The stop valve 2 is arranged on the upstream horizontal section of the expansion bend 3. To ensure the drain effect of this horizontal section, second drain pipes 6 are arranged on both the upstream and downstream sides of the expansion bend 3. Both the first drain pipe 5 and the second drain pipe 6 are connected to the water collection device to drain the condensed water into the water collection device. The regulating valves on the first drain pipe 5 and the second drain pipe 6 are both used to cut off the drain pipe and the water collection device, which is convenient for closing the drain pipe during the period when the steam supply is stopped.
[0028] Both the first drain pipe 5 and the second drain pipe 6 are connected to the monitoring pipe section 1 through steam traps.
[0029] Both the first drain pipe 5 and the second drain pipe 6 are provided with U-shaped water seals 16; the top end of the U-shaped water seal 16 is lower than the lowest point of the monitored pipe section 1. The U-shaped water seal 16 is arranged on the drain pipe, which can achieve the sealing of the drain pipe, reduce the leakage of steam, and to a certain extent reduce problems such as steam leakage caused by the failure of the regulating valve.
[0030] An exhaust pipe 17 is provided at the highest point downstream of the U-shaped water seal 16. The exhaust pipe 17 is connected to the steam main pipe. The exhaust pipe 17 conveys the steam in the water delivery pipe back into the steam main pipe, and a gas check valve is connected to the output end of the exhaust pipe 17.
[0031] Two second drain pipes 6 can share a drain branch pipe, and a U-shaped water seal 16 is arranged on the drain branch pipe. A common drain main pipe 18 can be shared downstream of the U-shaped water seal 16 of the first drain pipe 5 and downstream of the U-shaped water seal 16 of the drain branch pipe, and the drain main pipe 18 extends into the water collection device.
[0032] The connection point of the exhaust pipe 17 connected to the drain branch pipe and the monitored pipe section 1 is located downstream of the second drain pipe 6, and the connection point of the exhaust pipe 17 on the first drain pipe 5 and the monitored pipe section 1 is located upstream of the first drain pipe 5. The gas entering the monitored pipe section 1 from the exhaust pipe 17 is mixed with the steam in the monitored pipe section 1.
[0033] In some possible embodiments, please refer to Figures 1 to 2 , the water collection device includes a sump 7 or a water collection tank 19. A liquid level measuring device and a submersible pump are arranged in the sump 7; a drain pump is connected to the drain pipe in the water collection tank 19.
[0034] When the water collection device is a sump 7, the outlet ends of the first drain pipe 5 and the second drain pipe 6 both extend to the upper part of the sump 7, and the condensed water in the first drain pipe 5 and the second drain pipe 6 is discharged into the sump 7. A submersible pump and a liquid level float are installed in the sump 7. When the liquid level in the sump 7 rises to a limit value, the submersible pump is started to recover the condensed water in the sump 7.
[0035] As Figure 2 and Figure 3 shown, when the water collection device is a water collection tank 19, the outlet ends of the first drain pipe 5 and the second drain pipe 6 both extend to the upper part of the water collection tank 19. A drain pipe is arranged at the lower part of the water collection tank 19, and a drain pump is connected to the drain pipe to recover the water in the water collection tank 19.
[0036] Adding a heat preservation layer on the outer side wall of the water collection tank 19 can avoid the problem that the temperature in the inspection well is too low and the hydrophobic water in the water collection tank 19 freezes.
[0037] The water collecting tank 19 is provided with a filter screen and a preheating pipeline 20. The preheating pipeline 20 is spirally arranged in the inner cavity of the water collecting tank 19.
[0038] A filter screen is installed in the water collecting tank 19. The filter screen is used to filter impurities in the condensed water conveyed by the drain pipe. An inspection opening is provided at the upper end of the water collecting tank 19. The inspection opening can be opened for inspecting the internal structure of the water collecting tank 19 and cleaning and replacing the filter screen. The filter screen can be inclined. The inclined filter screen can increase the flow-through area and reduce blockage.
[0039] The included angle between the filter screen and the horizontal plane is 45° - 75°.
[0040] Optionally, the inlet of the preheating pipeline 20 in the water collecting tank 19 is located at the lower part of the water collecting tank 19, and the outlet of the preheating pipeline 20 is located at the upper part of the water collecting tank 19. The part of the preheating pipeline 20 located in the water collecting tank 19 is spirally distributed. The inlet and outlet of the preheating pipeline 20 are both connected to the steam main pipe. The preheating pipeline 20 is in parallel with the steam main pipe, and it is used to preheat the condensed water in the water collecting tank 19 with part of the high-temperature steam as a heat source to prevent the condensed water from freezing.
[0041] An exhaust pipe 21 is provided at the upper end of the water collecting tank 19. The exhaust pipe 21 is located on one side of the outlet end of the preheating pipeline 20. The exhaust pipe 21 is used to discharge the air in the water collecting tank 19 and a very small amount of steam in the condensed water.
[0042] In some possible embodiments, please refer to Figure 1 , the metering and monitoring system includes a control cabinet 8 and a power supply device. The control cabinet 8 is arranged on one side of the inspection well. The instrument control sub-system is located in the control cabinet 8. The instrument control sub-system includes a flow integrator 10, a payment management system device and a power supply device that are interconnected. The power supply device is used to supply power to the flow integrator 10 and the payment management system device; the flow integrator 10 is electrically connected to the flowmeter 4 and the stop valve 2; the power supply device is located outside the control cabinet 8 and is electrically connected to the power supply device.
[0043] The control cabinet 8 is installed at a position 2M away from the inspection well. The control cabinet 8 includes a solar energy storage and inversion system, a UPS uninterruptible power supply system 12, an instrument power distribution system, a solar energy storage and inversion charging protection system 13, a flow integrator 10 and an intelligent prepaid system 11. The solar energy storage and inversion system cooperates with the UPS uninterruptible power supply system 12, the instrument power distribution system and the solar energy storage and inversion charging protection system 13 to realize the problem of supplying power to the electrical appliances in the control cabinet 8 by using a solar photovoltaic conversion device; that is, the solar energy storage and inversion system, the UPS uninterruptible power supply system 12, the instrument power distribution system and the solar energy storage and inversion charging protection system 13 are used to supply power to the flow integrator 10 and the intelligent prepaid system 11. An antenna 9 is provided at the upper end of the control cabinet 8.
[0044] Among them, the flow integrator 10 realizes functions such as temperature access, pressure access, flow access, temperature and pressure compensation, etc. The flow integrator 10 cooperates with the flowmeter 4 to monitor the steam volume passing through the monitored pipe section 1.
[0045] The intelligent prepaid system 11 has no less than 4-channel standard 485 communication access, and 10 groups of data are accessed per channel; the data storage is not less than 1 year. The intelligent prepaid system 11 includes a unit price setting module for fees, a real-time fee calculation module, an accumulated fee calculation module, a pre-deposited amount module, a real-time remaining amount module, a control module for delinquent steam cut-off setting and control items, an electric globe valve 2 control module, a communication module, an online and card payment system module, a power-off control and recording module, etc. Among them, the communication module can utilize wired networks, wireless networks, GPRS networks, etc.
[0046] A solar power supply system 14 is installed on the side of the instrument control cabinet 8. The solar power supply system 14 is connected to a solar energy storage and inversion system and a solar energy storage, inversion and charging protection system 13 for supplying power to the control cabinet 8. The solar power supply system 14 includes a bracket, solar panels, a storage battery, an inverter and a charging protection device.
[0047] The metering and monitoring system further includes a monitoring device, which is arranged on one side of the inspection well. Specifically, the control device includes a video monitoring device 15 installed on the side of the well chamber, a monitoring device well chamber and a distribution cabinet. The video monitoring device includes a vertical pole, a mounting bracket, a camera, and real-time images and historical traces can be viewed through the camera mobile phone APP.
[0048] The steam pressure and temperature are connected to the flow integrator 10, and the flow calculation is connected to the intelligent prepaid system 11 through a communication method; and corresponding parameters are set for the flow integrator 10 and the intelligent prepaid system 11. The intelligent prepaid system 11 outputs to the server using a GPRS data flow card. The intelligent prepaid system 11 applies for a WeChat account and an online payment WeChat QR code, and in addition, a chip card is set for fee payment.
[0049] The above settings of the metering and monitoring system can realize viewing the real-time data, traceability affiliated data, status of the electric globe valve 2, and fee usage status of the intelligent prepaid system 11 through a browser on any PC with a network, so as to facilitate the monitoring of the steam supply system.
[0050] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A steam metering system, characterized in that: It comprises an inspection well, a steam main pipe, a drain system and a metering monitoring system; the steam main pipe comprises a monitoring pipe section (1) which runs transversely through the inspection well, and an expansion bend (3) and a stop valve (2) are arranged in the middle of the monitoring pipe section (1); the drain system is arranged on both sides of the expansion bend (3), and a regulating valve is arranged on the drain system; the metering monitoring system comprises an instrument monitoring subsystem and an instrument control subsystem, and the instrument monitoring subsystem comprises a flow meter (4) arranged on the expansion bend (3), a temperature sensing device and a pressure sensing device; the instrument control subsystem is electrically connected to the instrument monitoring subsystem, the stop valve (2) and the regulating valve.
2. The steam metering system according to claim 1, characterized in that The drainage system comprises a drainage pipe group arranged on the monitoring pipe section (1) and a water collecting device arranged at the bottom of the inspection well, wherein the drainage pipe group comprises a first drainage pipe (5) arranged downstream of the expansion bend (3) and two second drainage pipes (6) respectively arranged on both sides of the stop valve (2); the output ends of the first drainage pipe (5) and the two second drainage pipes (6) are both connected to the water collecting device; the regulating valve is provided on the first drainage pipe and the second drainage pipe (6).
3. The steam metering system according to claim 2, characterized in that The first drain pipe (5) and the second drain pipe (6) are both connected to the monitoring pipe section (1) via a steam trap.
4. The steam metering system according to claim 3, characterized in that The first drain pipe (5) and the second drain pipe (6) are both provided with a U-shaped water trap (16); the top end of the U-shaped water trap (16) is lower than the lowest point of the monitoring pipe section (1).
5. The steam metering system according to claim 4, characterized in that An exhaust pipe (17) is provided at the highest point downstream of the U-shaped water trap (16).
6. The steam metering system according to claim 2, characterized in that: The water collection device comprises a water collection pit (7) or a water collection tank (19), wherein a liquid level metering device and a submersible pump are arranged in the water collection pit (7); and a drainage pump is connected to the drainage pipe in the water collection tank (19).
7. The steam metering system according to claim 6, characterized in that A filter screen and a preheating pipe (20) are arranged in the water collecting box (19); the preheating pipe (20) is spirally arranged in the inner cavity of the water collecting box (19).
8. The steam metering system according to claim 7, characterized in that The upper end of the water collecting tank (19) is provided with a drain pipe (21), and the drain pipe (21) is located on one side of the outlet end of the preheating pipe (20).
9. The steam metering system according to claim 1, characterized in that: The metering monitoring system includes a control cabinet (8) and a power supply device. The control cabinet (8) is arranged on one side of the inspection well. The instrument control subsystem is located in the control cabinet (8). The instrument control subsystem includes a flow integrator (10), a payment management system device and a power supply device which are interconnected. The power supply device is used to supply power to the flow integrator (10) and the payment management system device. The flow integrator (10) is electrically connected to the flow meter (4) and the stop valve (2). The power supply device is located outside the control cabinet (8) and is electrically connected to the power supply device.
10. The steam metering system according to claim 1, characterized in that The metering monitoring system also includes a monitoring device, which is arranged on one side of the inspection well.