Steam pipeline with improved structure
By adding a tee joint, temperature sensor, and drain pipe to the steam pipeline, the problem of pressure and temperature loss in long-distance steam transmission pipelines was solved, enabling steam to be fed into the steam turbine for power generation on demand, reducing costs and labor intensity, and improving power generation efficiency.
Patent Information
- Application Number
- CN202520136579.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2035-01-21
AI Technical Summary
In existing technologies, long-distance steam transmission pipelines suffer from pressure and temperature losses, resulting in steam that does not meet the turbine inlet steam standards. This necessitates frequent shutdowns and restarts, increasing costs and labor intensity, and posing safety hazards.
Add a tee joint, temperature sensor, and condensate drain pipe to the steam pipeline. Use the temperature sensor to monitor the steam temperature and slowly open the steam-electric control valve so that the steam enters the turbine to generate electricity after reaching the standard temperature. Add a condensate expansion tank to discharge wet steam and reduce noise.
This technology enables steam to be fed into the turbine on demand, meeting the inlet steam temperature standard, reducing the frequency of shutdowns and restarts, lowering costs and labor intensity, and improving power generation efficiency and economic benefits.
Smart Images
Figure CN223647891U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a steam pipe with an improved structure, belonging to the field of chemical production technology. Background Technology
[0002] The waste heat steam boiler for the carbon black industry is a special waste heat recovery device for carbon black. It can use the waste heat generated during the carbon black production process to produce steam. The steam produced is generally 5.0 MPa waste heat steam at a temperature of 450℃.
[0003] The current technology is not comprehensive and has the following drawbacks: production companies do not have steam turbines and need to transfer waste heat steam to other places through long-distance steam pipelines.
[0004] Furthermore, the rated inlet steam pressure of the steam turbine is 2.35 MPa, and the temperature is 390℃±15℃, with a minimum inlet steam temperature not lower than 375℃. If the total length of the long-distance steam transmission pipeline is over 1000 meters, there will be significant pressure drop and temperature loss. A steam desuperheater and pressure reducer is needed to reduce the pressure of the waste heat steam (5.0 MPa, 450℃) to 2.35 MPa, which meets the rated inlet steam pressure of the steam turbine. The steam temperature drops significantly, to between 360℃ and 370℃, which does not meet the steam turbine's rated inlet steam temperature requirement of 390℃. Forcibly performing steam paralleling via the paralleling control valve poses safety hazards and may even lead to water hammer due to steam carryover.
[0005] Consequently, before utilizing waste steam heat, the turbine had to be shut down 24 hours in advance to allow it to cool down before being started up using a cold-start method. Given the unstable nature of waste steam heat production, there were occasional sudden shutdowns or maintenance shutdowns, necessitating frequent shutdowns and restarts. This not only increased the frequency of operations but also impacted power generation, resulting in unnecessary economic losses.
[0006] To solve one of the above problems, there is an urgent need for a steam pipe with an improved structure. Utility Model Content
[0007] Based on the shortcomings of the existing technology, the technical problem to be solved by this utility model is: how to realize the on-demand opening of the steam-connecting electronic control valve for steam connection operation, so that steam meeting the inlet steam temperature standard can enter the operating steam turbine for power generation, saving start-up and shutdown costs, reducing the labor intensity of workers, and creating considerable economic benefits. To this end, a steam pipeline with an improved structure is provided.
[0008] The improved steam pipeline of this utility model includes a steam boiler for generating high-temperature and high-pressure steam. Its features include: a three-way connector; a first port of the three-way connector is connected to a boiler steam pipeline, the other end of which is connected to the steam outlet of the steam boiler; a second port of the three-way connector is connected to a main steam pipeline, the other end of which is connected to a steam turbine; a third port of the three-way connector is connected to a parallel steam control valve; the inlet of the parallel steam control valve is connected to a long-distance transmission steam pipeline; the other end of the long-distance transmission steam pipeline is connected to an industrial waste heat source, which is steam waste heat; a steam desuperheater and pressure reducer is installed at the end of the long-distance transmission steam pipeline connected to the industrial waste heat source; a temperature sensor is installed at the end of the long-distance transmission steam pipeline connected to the parallel steam control valve, and a drain pipe is connected in parallel to it; the other end of the drain pipe is connected to a drain expansion tank.
[0009] The temperature sensor is used to monitor changes in steam temperature in real time. A condensate drain pipe is added before the steam merging point between the long-distance steam transmission pipeline and the boiler steam pipeline (i.e., before the steam merging control valve) to discharge wet steam, ensuring the steam in the long-distance transmission pipeline reaches a superheated state. When the temperature sensor detects a steam temperature above 385℃, the steam merging control valve is slowly opened to initiate the steam merging operation. This allows steam meeting the inlet temperature standard to enter the operating turbine for power generation, saving start-up and shutdown costs, reducing labor intensity, and creating considerable economic benefits. The added DN50 condensate drain pipe connects to a 3.5m³ condensate expansion tank, providing both expansion and noise reduction functions.
[0010] Preferably, the industrial waste heat source is the waste heat of steam generated during the production process, with a pressure rating of 5.0 MPa and a temperature of 450°C. The steam desuperheater reduces the steam pressure of 5.0 MPa and 450°C to 2.35 MPa, which is the steam pressure that meets the rated pressure of the steam turbine inlet. After this, the steam temperature is significantly reduced to between 360°C and 370°C.
[0011] Preferably, the length of the long-distance steam transmission pipeline is 1000±50m.
[0012] Preferably, it also includes a controller, wherein the steam-powered valve is electrically connected to the signal output terminal of the controller, the temperature sensor is electrically connected to the signal input terminal of the controller, the controller receives the temperature signal transmitted by the temperature sensor, and when the preset temperature is reached, it can control the steam-powered valve to open.
[0013] Preferably, a main pipeline electrically controlled valve is installed on the main steam pipeline.
[0014] Preferably, the long-distance steam transmission pipeline includes multiple interconnected steam pipeline units, with adjacent steam pipeline units connected to each other by flanges and fastening bolts, and a support frame provided at the connection point.
[0015] Preferably, a vent pipe is connected to the long-distance steam transmission pipeline, a vent shut-off valve is installed on the vent pipe, and a silencer is connected to the other end of the vent pipe. The pipeline used by Bora Steam for large-scale steam venting utilizes the existing DN200 steam supply pipeline, with an additional silencer added to reduce noise.
[0016] Preferably, the support frame includes an upper sliding plate, on the upper surface of which a left mounting plate and a right mounting plate are detachably mounted. The left mounting plate is fitted with a left pipe clamp via a pipe clamp support A, and the right mounting plate is fitted with a right pipe clamp via a pipe clamp support B. A clamping plate A and a clamping plate B are also mounted on the left and right mounting plates. The bottom of the flange is clamped between clamping plates A and B. A sliding lower platform is provided below the upper sliding plate to slide with it. The support is mounted on the upper surface of a concrete support, which is resting on the ground.
[0017] Preferably, the device further includes a screw, wherein a clamping plate C and a clamping plate D are provided in the middle of the screw, and a top connecting plate A and a top connecting plate B are respectively provided at the top of the left and right pipe clamps. One end of the screw passes through the top connecting plate A and is connected to the first nut, and the other end of the screw passes through the top connecting plate B and is connected to the second nut.
[0018] Preferably, the left-side clamp includes an upper clamp body connected to the top connecting plate A and a lower clamp body connected to the clamp support A, wherein the upper clamp body and the lower clamp body are connected by fastening bolts.
[0019] The flange is limited by clamps A, B, C, and D. At the same time, the steam pipe unit is fixed by the left and right pipe clamps, screws, left and right mounting plates, pipe clamp support A and pipe clamp support B to ensure the reliability of the connection. The upper slide plate can slide relative to the lower slide plate to ensure the free sliding of the pipe.
[0020] Compared with the prior art, the present invention has the following beneficial effects:
[0021] The improved steam pipeline of this utility model adds a drain pipe at the point of connection between the long-distance steam transmission pipeline and the boiler steam pipeline, that is, before the connection electric control valve, to discharge wet steam and make the steam in the long-distance steam transmission pipeline reach a superheated state.
[0022] The improved steam pipeline of this utility model includes a temperature sensor that monitors changes in steam temperature at any time. When the temperature sensor detects that the steam temperature reaches 385°C or higher, the steam-connecting electronic control valve is slowly opened to perform a steam-connecting operation, allowing steam that meets the inlet temperature standard to enter the operating steam turbine for power generation. This saves start-up and shutdown costs, reduces the labor intensity of workers, and creates considerable economic benefits.
[0023] The steam pipe with improved structure described in this utility model adds a condensate drain pipe, the outlet of which is connected to a condensate expansion tank, and simultaneously has the functions of capacity expansion and steam exhaust noise reduction.
[0024] The steam pipe with improved structure described in this utility model uses clamping plates A, B, C, and D to limit the flange, and uses left and right pipe clamps, screws, left and right mounting plates, pipe clamp support A and pipe clamp support B to fix the steam pipe unit, ensuring the reliability of the connection. The upper sliding plate can slide relative to the lower sliding platform, ensuring the free sliding of the pipe. Attached Figure Description
[0025] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.
[0026] Figure 1 This is a schematic diagram of the structure of this utility model;
[0027] Figure 2 This is a schematic diagram of the support frame structure;
[0028] In the diagram: 1. Tee connector; 2. Boiler steam pipe; 3. Long-distance steam transmission pipe; 4. Main steam pipe; 5. Empty valve; 6. Steam-connecting electrically controlled valve; 7. Drain pipe; 8. Drain expansion tank; 9. Steam boiler; 10. Steam turbine; 11. Temperature sensor; 12. Steam desuperheater and pressure reducer; 13. Controller; 14. Main pipe electrically controlled valve; 15. Steam pipe unit; 16. Flange; 17. Fastening bolt; 18. Upper sliding plate; 19. Left mounting plate; 20. Right mounting plate; 21. Pipe clamp support A; 22. Pipe clamp support B; 23. Left pipe clamp; 24. Right pipe clamp; 25. Clamping plate A; 26. Clamping plate B; 27. Screw; 28. Clamping plate C; 29. Clamping plate D; 30. Top connecting plate A; 31. Top connecting plate B; 32. Lower sliding platform; 33. Concrete support. Detailed Implementation
[0029] The present invention will be further described below with reference to the accompanying drawings: The present invention will be further described below through specific embodiments, but it is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
[0030] Example 1, as Figure 1-2 As shown, the improved steam pipeline includes a steam boiler 9 for generating high-temperature, high-pressure steam, and a tee connector 1. The first port of the tee connector 1 is connected to a boiler steam pipeline 2, the other end of which is connected to the steam outlet of the steam boiler 9. The second port of the tee connector 1 is connected to a main steam pipeline 4, the other end of which is connected to a steam turbine 10. The third port of the tee connector 1 is connected to a parallel steam control valve 6. The inlet of the parallel steam control valve 6 is connected to a long-distance transmission steam pipeline 3, the other end of which is connected to an industrial waste heat source, which is steam waste heat. A steam desuperheater and pressure reducer 12 is installed at the end of the long-distance transmission steam pipeline 3 connected to the industrial waste heat source. A temperature sensor 11 is installed at the end of the long-distance transmission steam pipeline 3 connected to the parallel steam control valve 6, and a drain pipe 7 is connected in parallel. The other end of the drain pipe 7 is connected to a drain expansion tank 8.
[0031] A condensate drain pipe 7 is added before the steam merging point of the long-distance steam transmission pipeline 3 and the boiler steam pipeline 2, i.e., before the steam merging control valve 6. This drain pipe is used to discharge wet steam, ensuring that the steam in the long-distance steam transmission pipeline 3 reaches a superheated state. The temperature sensor 11 is used to monitor changes in steam temperature at any time. When the temperature sensor detects that the steam temperature reaches above 385℃, the steam merging control valve 6 is slowly opened to initiate the steam merging operation. This allows steam meeting the inlet temperature standard to enter the operating steam turbine for power generation. The added DN50 condensate drain pipe connects to a 3.5m³ condensate expansion tank 8, providing both expansion and noise reduction functions.
[0032] Example 2, as Figure 1-2As shown, the improved steam pipeline includes a steam boiler 9 for generating high-temperature, high-pressure steam, and a tee connector 1. The first port of the tee connector 1 is connected to a boiler steam pipeline 2, the other end of which is connected to the steam outlet of the steam boiler 9. The second port of the tee connector 1 is connected to a main steam pipeline 4, the other end of which is connected to a steam turbine 10. The third port of the tee connector 1 is connected to a parallel steam control valve 6. The inlet of the parallel steam control valve 6 is connected to a long-distance transmission steam pipeline 3, the other end of which is connected to an industrial waste heat source, which is steam waste heat. A steam desuperheater and pressure reducer 12 is installed at the end of the long-distance transmission steam pipeline 3 connected to the industrial waste heat source. A temperature sensor 11 is installed at the end of the long-distance transmission steam pipeline 3 connected to the parallel steam control valve 6, and a drain pipe 7 is connected in parallel. The other end of the drain pipe 7 is connected to a drain expansion tank 8.
[0033] Furthermore, the industrial waste heat source is the waste heat of steam generated during the production process, with a pressure rating of 5.0 MPa and a temperature of 450°C. The steam desuperheater 12 reduces the steam pressure of 5.0 MPa and 450°C to 2.35 MPa, which is the steam pressure that meets the rated pressure of the steam turbine inlet. After this, the steam temperature is significantly reduced to between 360°C and 370°C.
[0034] Furthermore, the length of the long-distance steam transmission pipeline 3 is 1000±50m.
[0035] Furthermore, it also includes a controller 13, the steam-powered valve 6 is electrically connected to the signal output terminal of the controller 13, the temperature sensor 11 is electrically connected to the signal input terminal of the controller 13, the controller 13 receives the temperature signal transmitted by the temperature sensor 11, and when the preset temperature is reached, it can control the steam-powered valve 6 to open.
[0036] The modification of the prior art in this specific embodiment lies in the hardware part. At the same time, the computer program involved is a simple program that can be easily implemented by those skilled in the art using existing computer program development platforms and well-known programming methods. In this article, the temperature sensor 11 and the controller are only a simple use of their functions and do not involve improvements to the methods or programs.
[0037] Furthermore, a main pipeline electrically controlled valve 14 is installed on the main steam pipeline 4.
[0038] Furthermore, the long-distance steam transmission pipeline 3 includes multiple interconnected steam pipeline units 15. Two adjacent steam pipeline units 15 are connected to each other by flanges 16 and fastening bolts 17, and a support frame is provided at the connection point.
[0039] Furthermore, a vent pipe is connected to the long-distance steam transmission pipeline 3, and a vent shut-off valve 5 is installed on the vent pipe. A silencer is connected to the other end of the vent pipe. The pipeline for large-scale steam venting by Bora Steam utilizes the existing DN200 steam supply pipeline, with an additional silencer to reduce noise.
[0040] In practical application, Jining Company A transmits steam to Jining Company B via a long-distance transmission pipeline 3. The high-pressure steam is then fed into the waste heat power generation unit, where the turbine generator sets generate electricity. After this project was put into operation, the power generation capacity of the waste heat power generation unit increased from 1200 kW / h using two waste heat boilers to approximately 3000 kW / h at full load, improving the efficiency of the turbine generator sets and achieving full-load power generation for multiple applications. This saved on start-up and shutdown costs, reduced the labor intensity of workers, and created considerable economic benefits.
[0041] Example 3, referring to Figure 2 The difference from Embodiment 2 is that the support frame includes an upper sliding plate 18, on the upper surface of which a left mounting plate 19 and a right mounting plate 20 are detachably mounted. The left mounting plate 19 is mounted with a left pipe clamp 23 via a pipe clamp support A21, and the right mounting plate 20 is mounted with a right pipe clamp 24 via a pipe clamp support B22. A clamping plate A25 and a clamping plate B26 are also mounted on the left mounting plate 19 and the right mounting plate 20. The bottom of the flange 16 is clamped between the clamping plates A25 and B26. Below the upper sliding plate 18 is a lower sliding platform 32 that slides with it. The platform 32 is mounted on the upper surface of a concrete support 33, which is supported on the ground.
[0042] Furthermore, it also includes a screw 27, with a clamping plate C28 and a clamping plate D29 provided in the middle of the screw 27. The top of the left pipe clamp 23 and the right pipe clamp 24 are respectively provided with a top connecting plate A30 and a top connecting plate B31. One end of the screw 27 passes through the top connecting plate A30 and is connected to the first nut, and the other end of the screw 27 passes through the top connecting plate B31 and is connected to the second nut.
[0043] Furthermore, the left-side clamp 23 includes an upper clamp body connected to the top connecting plate A30 and a lower clamp body connected to the clamp support A21, the upper clamp body and the lower clamp body being connected by fastening bolts.
[0044] The flange 16 is limited by clamping plates A25, B26, C28, and D29. At the same time, the steam pipe unit 15 is fixed by the left pipe clamp 23, right pipe clamp 24, screw 27, left mounting plate 19, right mounting plate 20, pipe clamp support A21, and pipe clamp support B22 to ensure the reliability of the connection. The upper sliding plate 18 can slide relative to the lower sliding platform 32 to ensure the free sliding of the pipe.
[0045] The improved steam pipeline of this utility model adds a drain pipe at the point of connection between the long-distance steam transmission pipeline and the boiler steam pipeline, that is, before the connection electric control valve, to discharge wet steam and make the steam in the long-distance steam transmission pipeline reach a superheated state.
[0046] The improved steam pipeline of this invention includes a temperature sensor for continuous monitoring of steam temperature changes. When the temperature sensor detects a steam temperature exceeding 385°C, the steam-connection control valve is slowly opened to initiate a steam-connection operation, allowing steam meeting the inlet temperature standard to enter the operating steam turbine for power generation.
[0047] The steam pipe with improved structure described in this utility model adds a condensate drain pipe, the outlet of which is connected to a condensate expansion tank, and simultaneously has the functions of capacity expansion and steam exhaust noise reduction.
[0048] The steam pipe with improved structure described in this utility model uses clamping plates A, B, C, and D to limit the flange, and uses left and right pipe clamps, screws, left and right mounting plates, pipe clamp support A and pipe clamp support B to fix the steam pipe unit, ensuring the reliability of the connection. The upper sliding plate can slide relative to the lower sliding platform, ensuring the free sliding of the pipe.
[0049] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
[0050] Any aspects of this invention not described in detail are well-known to those skilled in the art.
Claims
1. A steam pipe with an improved structure, comprising a steam boiler for generating high-temperature, high-pressure steam, characterized in that: It also includes a tee connector, the first port of which is connected to a boiler steam pipe, the other end of which is connected to the steam outlet of a steam boiler; the second port of which is connected to a main steam pipe, the other end of which is connected to a steam turbine; the third port of which is connected to a parallel steam control valve; the inlet of the parallel steam control valve is connected to a long-distance transmission steam pipe; the other end of the long-distance transmission steam pipe is connected to an industrial waste heat source, which is steam waste heat; a steam desuperheater and pressure reducer is installed at the end of the long-distance transmission steam pipe connected to the industrial waste heat source; a temperature sensor is installed at the end of the long-distance transmission steam pipe connected to the parallel steam control valve, and a drain pipe is connected in parallel to it; the other end of the drain pipe is connected to a drain expansion tank.
2. The steam pipe with the improved structure according to claim 1, characterized in that, The industrial waste heat source is the waste heat of steam generated during the production process, with a pressure rating of 5.0 MPa and a temperature of 450°C. The steam desuperheater reduces the steam pressure of 5.0 MPa and temperature of 450°C to a pressure of 2.35 MPa and a temperature between 360°C and 370°C.
3. The steam pipe with the improved structure according to claim 1, characterized in that, The length of the long-distance steam transmission pipeline is 1000±50m.
4. The steam pipe with the improved structure according to claim 1, characterized in that, It also includes a controller, wherein the steam-powered electric valve is electrically connected to the signal output terminal of the controller, and the temperature sensor is electrically connected to the signal input terminal of the controller.
5. The steam pipe with the improved structure according to claim 4, characterized in that, The main steam pipeline is equipped with a main pipeline electrically controlled valve.
6. The steam pipe with the improved structure according to claim 5, characterized in that, The long-distance steam transmission pipeline includes multiple interconnected steam pipeline units. Two adjacent steam pipeline units are connected to each other by flanges and fastening bolts, and a support frame is provided at the connection point.
7. The steam pipe with the improved structure according to claim 6, characterized in that, The long-distance steam transmission pipeline is connected to a vent pipe, which is equipped with a vent shut-off valve. The other end of the vent pipe is connected to a silencer.