A low-noise, rapid steam diversion device for medium-pressure steam in a steam turbine

Abstract

This utility model discloses a low-noise, rapid steam diversion device for medium-pressure steam in a steam turbine, comprising a steam turbine, a main steam valve, a medium-pressure steam header, and an electric main valve. The electric main valve is installed at the front of the medium-pressure steam header, and the rear end of the medium-pressure steam header is connected to the steam turbine via the main steam valve. A diversion and venting mechanism for depressurizing and diverting excess steam is connected to the middle side of the medium-pressure steam header at the front end of the main steam valve. A noise-reducing venting tank for drainage is connected to the end of the diversion and venting mechanism. The function of this utility model is that after installation and commissioning, the efficiency of warm-up pipes and the turbine is improved, and the turbine commissioning preparation time is shortened from 7 hours to 4 hours. The consumption of secondary demineralized water is reduced by 150 m³ per start-up. 3 The steam emission noise was reduced from 92dB to 80dB, which is lower than the occupational health requirements.

Description

Technical Field

[0001] This utility model patent belongs to the field of steam turbine technology, specifically relating to a low-noise and rapid steam diversion device for medium-pressure steam in a steam turbine. Background Technology

[0002] The sintering plant currently operates with a single 9MW steam turbine, driven by steam generated from two waste heat boilers. During normal operation, the turbine requires a main steam pressure >1.6MPa and a temperature >350℃; the makeup steam, being low-pressure steam, requires a pressure >0.45MPa and a temperature >160℃. Steam temperature and pressure are crucial parameters affecting turbine operation. If these values ​​are not met, the steam's working capacity will decrease. Most importantly, low-temperature steam increases the humidity of the last few stages of the turbine blades, exacerbating the erosion effect of water droplets and impacting blade safety and lifespan. Therefore, to ensure the safe and stable operation of the turbine, it is essential to ensure that the steam temperature and pressure entering the turbine are within the required range.

[0003] Due to the limited capacity of the sintering ore bins in the blast furnace, sintering is currently operating at low capacity, frequently resulting in shutdowns when the bins are full. If the waste heat boiler and turbine shut down for more than an hour, cutting off the heat source and steam, the temperature of the boiler, steam pipes, and turbine will drop. Restarting requires a lengthy warm-up process. During this process, the boiler steam pressure and temperature may reach the required values, but the steam temperature and pressure reaching the turbine may not. This is mainly because the turbine inlet steam valve can only maintain a small opening during the warm-up process, resulting in a slow steam flow rate. Furthermore, the long steam pipes (approximately 400m) lead to significant heat loss during steam transport, generating a large amount of condensate, thus causing a decrease in steam temperature and pressure, and a slow rate of increase. The waste heat boiler, due to obstructed steam output, experiences increasingly higher pressure. When the pressure exceeds the rated pressure, it is forced to vent to the atmosphere, resulting in a large waste of demineralized water. Moreover, the high-pressure steam venting is accompanied by significant noise, negatively impacting the surrounding environment.

[0004] The problem that this utility model aims to solve is:

[0005] 1. Improve the warm-up speed of steam turbines and steam pipelines, shorten standby time, and reduce steam venting;

[0006] 2. Solve the problem of excessive noise caused by steam venting, improve the production and living environment, and ensure occupational health.

[0007] Therefore, this utility model proposes a low-noise and rapid steam diversion device for medium-pressure steam in steam turbines. Utility Model Content

[0008] To solve the above-mentioned technical problems, this utility model provides a low-noise and rapid steam diversion device for medium-pressure steam in steam turbines, which has high efficiency in warming up pipes and the engine, reduces the consumption of secondary demineralized water, and reduces steam venting noise.

[0009] To achieve the above-mentioned technical effects, this utility model is implemented through the following technical solution: a low-noise and rapid diversion device for medium-pressure steam in a steam turbine, comprising a steam turbine, a main steam valve, a medium-pressure steam header, and an electric main valve. An electric main valve is installed on the front side of the medium-pressure steam header, and the rear end of the medium-pressure steam header is connected to the steam turbine through the main steam valve. A diversion and venting mechanism for reducing the pressure and diverting excess steam is connected to the middle side of the medium-pressure steam header at the front end of the main steam valve. A noise-reducing and drainage silencing venting bucket for draining water is connected to the end of the diversion and venting mechanism.

[0010] Preferably, the drainage and venting mechanism further includes a main drainage and venting pipe, an auxiliary drainage and venting pipe, a manual valve, an electric valve A, and an electric valve B. The front end of the main drainage and venting pipe is connected to the middle side of the medium-pressure steam header, and the end of the main drainage and venting pipe is connected to a silencer venting tank. A manual valve is installed on the front side of the main drainage and venting pipe, and an electric valve A is installed in the middle of the main drainage and venting pipe. A auxiliary drainage and venting pipe with a diameter smaller than that of the main drainage and venting pipe is connected to the main drainage and venting pipe on both sides before and after the electric valve A, and an electric valve B is installed in the middle of the auxiliary drainage and venting pipe.

[0011] Preferably, the silencer venting barrel further includes a cylinder, a silencer medium, a silencer core, an air inlet pipe, an exhaust port, and a drain port. The silencer core is installed at the center of the lower part of the cylinder, and the space between the cylinder and the silencer core is filled with a silencer medium that can filter steam. The air inlet pipe is located at the lower end of the cylinder and connects the lower end of the silencer core to the end of the main venting pipe. The exhaust port is located at the top of the cylinder, and the drain port is located on the right side of the lower end of the cylinder.

[0012] Preferably, the cylinder is made of 10mm thick steel plate.

[0013] Preferably, the sound-absorbing medium is a pebble with a diameter of 15-20 cm.

[0014] Preferably, the muffler core is configured as a three-layer circular sleeve structure, with exhaust holes of increasing diameter on the side walls of the three sleeves from the inside to the outside.

[0015] The beneficial effects of this utility model are:

[0016] After the installation and commissioning of this device, the efficiency of pipe warm-up and turbine warm-up was improved, and the turbine preparation time was shortened from 7 hours to 4 hours. The consumption of secondary demineralized water per start-up was reduced by 150 m³. 3 The steam emission noise level was reduced from 92 dB to 80 dB, which is below the occupational health requirements. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Those skilled in the art can obtain other drawings based on these drawings without creative effort:

[0018] Figure 1 This is a structural diagram of the present invention;

[0019] Figure 2 This is a cross-sectional schematic diagram of the sound-absorbing venting barrel of this utility model;

[0020] Figure 3 This is a cross-sectional schematic diagram of the muffler core of this utility model;

[0021] The attached diagram lists the components represented by each number as follows:

[0022] 1. Steam turbine; 2. Main steam valve; 3. Medium-pressure steam header; 4. Electric main valve; 5. Drainage and venting main pipe; 6. Drainage and venting auxiliary pipe; 7. Manual valve; 8. Electric valve A; 9. Electric valve B; 10. Shell; 11. Silencing medium; 12. Silencer core; 13. Inlet pipe; 14. Exhaust port; 15. Drain outlet; 16. Exhaust hole. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0024] like Figures 1 to 3 As shown in this embodiment, the inventors have discovered the following problems with the prior art: the steam turbine and steam pipes have slow warm-up and warm-up speeds, long standby times, and excessive steam venting; the noise caused by steam venting exceeds the standard, resulting in poor production and threatening occupational health.

[0025] Therefore, the inventor provides a low-noise and rapid diversion device for medium-pressure steam in a steam turbine 1, including a steam turbine 1, a main steam valve 2, a medium-pressure steam header 3, and an electric main valve 4. The electric main valve 4 is installed on the front side of the medium-pressure steam header 3. The rear end of the medium-pressure steam header 3 is connected to the steam turbine 1 through the main steam valve 2. A diversion and venting mechanism for reducing the pressure and diverting excess steam is connected to the middle side of the medium-pressure steam header 3 at the front end of the main steam valve 2. A noise-reducing and venting bucket for draining water is connected to the end of the diversion and venting mechanism.

[0026] Based on the above embodiments, the drainage and venting mechanism provided in this embodiment also includes a drainage and venting main pipe 5, a drainage and venting auxiliary pipe 6, a manual valve 7, an electric valve A8, and an electric valve B9. The front end of the drainage and venting main pipe 5 is connected to the middle side of the medium-pressure steam header 3, and the end of the drainage and venting main pipe 5 is connected to a silencer venting tank. A manual valve 7 is installed on the front side of the drainage and venting main pipe 5, and an electric valve A8 is installed in the middle of the drainage and venting main pipe 5. Drainage and venting auxiliary pipes 6 with a diameter smaller than that of the drainage and venting main pipe 5 are connected to the drainage and venting main pipe 5 on both sides before and after the electric valve A8. An electric valve B9 is installed in the middle of the drainage and venting auxiliary pipe 6.

[0027] The usage method of this structure is as follows: After startup, when the steam pressure generated by the waste heat boiler reaches 1.3MPa and the temperature reaches 250℃, the electric main valve 4 of the medium-pressure steam header 3 needs to be opened, the manual valve 7 on the DN150mm diameter venting main pipe 5 needs to be opened, and the electric valve A8 needs to be opened slowly in stages according to the warm-up requirements. The main steam valve 2 of the turbine 1 starts normal warm-up. At this point, apart from a small portion of the steam flowing through turbine 1, the majority of the steam is discharged into the atmosphere through the venting main pipe 5 and the silencer venting tank. This solves the problem of obstructed steam flow during the warm-up process, greatly increases the steam velocity, and accelerates the pressure and temperature rise at the end of the steam pipeline, shortening the warm-up time. Turbine 1 can then be put into operation in the shortest possible time. Simultaneously, a bypass venting auxiliary pipe 6 with a diameter of DN65mm is installed on the steam venting main pipe 5, equipped with an electric regulating valve B9. This electric valve B9 is automatically controlled by DCS. When the steam pressure of the waste heat boiler exceeds the rated pressure setting value, the electric valve B9 automatically opens to release steam and reduce the pressure. When the set pressure value is reached, it automatically closes. This solves the noise pollution problem caused by direct steam venting from the waste heat boiler.

[0028] Based on the above embodiments, the silencer venting barrel provided in this embodiment also includes a cylinder 10, a silencer medium 11, a silencer core 12, an air inlet pipe 13, an exhaust port 14, and a drain port 15. The silencer core 12 is installed at the lower center of the cylinder 10. The space between the cylinder 10 and the silencer core 12 is filled with a silencer medium 11 that can filter steam. The air inlet pipe 13 is located at the lower end of the cylinder 10 and connects the lower end of the silencer core 12 to the end of the main venting pipe 5. The exhaust port 14 is located at the top of the cylinder 10, and the drain port 15 is located on the right side of the lower end of the cylinder 10.

[0029] Because the steam pressure is high, the venting process is accompanied by a lot of noise. Therefore, this structure can ensure the smooth flow of steam through the silencer core 12 and the silencing medium 11, and also enhance the silencing effect. At the same time, the bottom of the silencing venting tank is equipped with a drain outlet 15, which allows the condensate generated during the venting process to be discharged from the drain outlet 15 into the nearby drainage well.

[0030] Based on the above embodiments, the cylinder 10 provided in this embodiment is made of 10mm thick steel plate.

[0031] Based on the above embodiments, the silencing medium 11 provided in this embodiment is set as pebbles with a diameter of 15-20cm; there are certain gaps between the pebbles in this structure, which can ensure the smooth flow of steam and enhance the silencing effect.

[0032] Based on the above embodiments, the silencer core 12 provided in this embodiment is configured as a three-layer circular sleeve structure, with exhaust holes 16 of increasing diameter respectively provided on the side walls of the three sleeves from the inside to the outside; this structure can reduce steam pressure and noise.

[0033] The working principle of this utility model is as follows: After startup, when the steam pressure generated by the waste heat boiler reaches 1.3MPa and the temperature reaches 250℃, the electric main valve 4 of the medium-pressure steam header 3 needs to be opened, the manual valve 7 on the DN150mm diameter venting main pipe 5 needs to be opened, and the electric valve A8 needs to be opened slowly in stages according to the warm-up requirements. The main steam valve 2 of the turbine 1 starts normal warm-up. At this point, apart from a small portion of the steam flowing through turbine 1, the majority of the steam is discharged into the atmosphere through the venting main pipe 5 and the silencer venting tank. This solves the problem of obstructed steam flow during the warm-up process, greatly increases the steam velocity, and accelerates the pressure and temperature rise at the end of the steam pipeline, shortening the warm-up time. Turbine 1 can then be put into operation in the shortest possible time. Simultaneously, a bypass venting auxiliary pipe 6 with a diameter of DN65mm is installed on the steam venting main pipe 5, equipped with an electric regulating valve B9. This electric valve B9 is automatically controlled by DCS. When the steam pressure of the waste heat boiler exceeds the rated pressure setting value, the electric valve B9 automatically opens to release steam and reduce the pressure. When the set pressure value is reached, it automatically closes. This solves the noise pollution problem caused by direct steam venting from the waste heat boiler.

[0034] In addition, due to the high steam pressure, the venting process is accompanied by considerable noise. Therefore, a silencer venting tank is installed at the outlet of the venting pipe. The silencer venting tank consists of a silencer core 12 and a cylinder 10. The cylinder 10 is made of 10mm thick rolled steel plate. The cavity between the core and the cylinder 10 is filled with pebbles with a diameter of approximately 15-20cm. The gaps between the pebbles ensure smooth steam flow while enhancing the silencing effect. A drain outlet 15 is located at the bottom of the silencer venting tank. The condensate generated during the venting process is discharged from this drain outlet 15 into a nearby drainage well.

[0035] The muffler core 12 adopts a three-layer circular sleeve structure, with exhaust holes 16 densely distributed on the circumference of each sleeve layer. The exhaust holes 16 are arranged in an alternating manner to enhance the muffler effect.

[0036] After the installation and commissioning of this set of medium-pressure steam low-noise rapid diversion device, the effect is significant, mainly reflected in the following aspects:

[0037] 1. Improved pipe and turbine warm-up efficiency reduces the preparation time for turbine 1 from 7 hours to 4 hours. Turbine 1 generates 3000 kWh * 3 = 9000 kWh in 3 hours, resulting in an annual increase in power generation of 9000 kWh * 36 = 324000 kWh, saving 324000 kWh * 0.5 yuan / kWh = 162,000 yuan in electricity costs.

[0038] 2. The consumption of secondary demineralized water is reduced by 150m³ each time the unit is started. 3 It can save 150m of water per year. 3 *36*3 yuan / m 3 =16,200 yuan;

[0039] 3. The steam emission noise level has been reduced from 92dB to 80dB, which is below the occupational health requirements.

[0040] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A low-noise, rapid steam diversion device for medium-pressure steam in a steam turbine, comprising a steam turbine (1), a main steam valve (2), a medium-pressure steam header (3), and an electric main valve (4), wherein the electric main valve (4) is installed on the front side of the medium-pressure steam header (3), and the rear end of the medium-pressure steam header (3) is connected to the steam turbine (1) through the main steam valve (2), characterized in that: The middle side of the medium-pressure steam header (3) at the front end of the main steam valve (2) is connected to a diversion and venting mechanism that can reduce the pressure and divert excess steam. The end of the diversion and venting mechanism is connected to a silencer venting bucket that can reduce noise and drain water. The diversion and venting mechanism also includes a diversion and venting main pipe (5), a diversion and venting auxiliary pipe (6), a manual valve (7), an electric valve A (8), and an electric valve B (9). The front end of the diversion and venting main pipe (5) is connected to the middle side of the medium-pressure steam header (3), and the end of the diversion and venting main pipe (5) is connected to the silencer venting bucket. A manual valve (7) is installed on the front side of the diversion and venting main pipe (5). An electric valve A (8) is installed in the middle of the diversion and venting main pipe (5). A diversion and venting auxiliary pipe (6) with a pipe diameter smaller than that of the diversion and venting main pipe (5) is connected to the diversion and venting main pipe (5) on both sides of the electric valve A (8). An electric valve B (9) is installed in the middle of the diversion and venting auxiliary pipe (6).

2. The low-noise, rapid steam diversion device for medium-pressure steam in a steam turbine according to claim 1, characterized in that: The silencer venting barrel also includes a cylinder (10), a silencer medium (11), a silencer core (12), an air inlet pipe (13), an exhaust port (14), and a drain port (15). The silencer core (12) is installed at the center of the lower part of the cylinder (10). The space between the cylinder (10) and the silencer core (12) is filled with a silencer medium (11) that can filter steam. The air inlet pipe (13) is located at the lower end of the cylinder (10) and connects the lower end of the silencer core (12) with the end of the main venting pipe (5). The exhaust port (14) is located at the top of the cylinder (10), and the drain port (15) is located on the right side of the lower end of the cylinder (10).

3. A low noise quick flow device for IP steam in a steam turbine according to claim 2, characterized in that: The cylindrical body (10) is made of 10mm thick steel plate.

4. A low noise quick flow device for IP steam in a steam turbine as claimed in claim 2, wherein: The sound-absorbing medium (11) is set as a pebble with a diameter of 15-20cm.

5. A low noise quick flow device for IP steam in a steam turbine as claimed in claim 2, wherein: The muffler core (12) is configured as a three-layer circular sleeve structure, with exhaust holes (16) of increasing diameter on the side walls of the three sleeves from the inside to the outside.

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