Adjusting device for reducing large starting temperature difference fluctuation of steam turbine
By designing regulating devices for steam supply, drainage expansion, and condensation mechanisms, the problem of poor drainage in the cylinder jacket heating system was solved, reducing cylinder temperature fluctuations and ensuring the safety of turbine startup and the continuity of production.
Patent Information
- Application Number
- CN202520463714.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2035-03-17
AI Technical Summary
Poor drainage in the cylinder jacket heating system leads to large temperature fluctuations in the cylinder, affecting turbine startup safety and causing production losses.
A regulating device including steam supply, condensate expansion and condensation mechanism was designed. The device controls the steam valve and separates the liquid to ensure that the steam and liquid are separated before entering the jacket for heating, thus avoiding liquid accumulation. A throttling plate and electric condensate valve are used to accelerate the liquid discharge, which is combined with the condenser to cool the liquid.
It effectively reduces the accumulation of liquid in the cylinder jacket, ensures smooth steam flow, reduces cylinder temperature fluctuations, improves the safety and reliability of turbine startup, and avoids safety hazards and production losses caused by water accumulation in the jacket.
Smart Images
Figure CN223634762U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to metallurgical industry especially, and relates to a kind of regulating device for reducing the large temperature difference fluctuation of steam turbine start. BACKGROUND
[0002] 60MW power generation steam turbine starts process interlayer heating drainage not smooth, leading to steam cylinder interlayer water accumulation to influence upper and lower cylinder temperature difference, causes great security risk to unit operation.
[0003] Because steam cylinder interlayer heating drainage not smooth has seriously affected power generator grid-connected power generation time in starting process, causes certain production loss. UTILITY MODEL CONTENT
[0004] The utility model aims at providing a kind of regulating device for reducing the large temperature difference fluctuation of steam turbine start, solve the problem of interlayer heating drainage not smooth.
[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme that:
[0006] The utility model provides a kind of regulating device for reducing the large temperature difference fluctuation of steam turbine start, including steam supply mechanism, drainage expansion mechanism and condensing mechanism,
[0007] The steam supply mechanism includes boiler, interlayer, steam outlet pipe, return steam pipe, first liquid discharge pipe and second liquid discharge pipe, the both ends of steam outlet pipe are communicated with boiler and interlayer respectively, the both ends of return steam pipe are communicated with boiler and interlayer respectively, and the interlayer is used for heating steam cylinder;
[0008] The drainage expansion mechanism includes drainage expander, water inlet pipe and water outlet pipe, the both ends of first liquid discharge pipe are communicated with steam outlet pipe and water inlet pipe respectively, the both ends of second liquid discharge pipe are communicated with steam outlet pipe and water inlet pipe respectively, and water inlet pipe is communicated with drainage expander;
[0009] The condensing mechanism includes condenser and liquid supply pipe, the both ends of water outlet pipe are communicated with drainage expander and condenser respectively, and the both ends of liquid supply pipe are communicated with condenser and boiler respectively;
[0010] Steam valve is arranged on steam outlet pipe, and steam valve is located at steam outlet end of steam outlet pipe.
[0011] Optionally, first valve and second valve are arranged on first liquid discharge pipe.
[0012] Optionally, throttling plate and electric drainage valve are arranged on second liquid discharge pipe, throttling plate is located at liquid outlet side of second liquid discharge pipe, and electric drainage valve is located at liquid inlet side of second liquid discharge pipe.
[0013] Optionally, the steam supply mechanism further comprises a cylinder, which is arranged in the interlayer.
[0014] Optionally, the steam supply mechanism further comprises a high-pressure discharge check valve, which is arranged on the return steam pipe.
[0015] Optionally, the drain expansion mechanism further comprises a steam outlet pipe, which is in communication with the drain expansion vessel and the condenser at two ends respectively.
[0016] Optionally, the condensing mechanism further comprises a return pipe, which is in communication with the drain expansion vessel and the condenser at two ends respectively.
[0017] Optionally, the condensing mechanism further comprises a deaerator, which is arranged on the liquid supply pipe.
[0018] Thanks to the above technical solution, the present application has the following advantages over the prior art:
[0019] The adjusting device for reducing large temperature difference fluctuation of steam turbine startup of the present application has the following advantages over the prior art: BRIEF DESCRIPTION OF DRAWINGS
[0020] Some specific embodiments of the present application will be described in detail hereinafter with reference to the accompanying drawings in an exemplary and non-limiting manner. The same reference signs in the drawings represent the same or similar components or parts. It should be understood by those skilled in the art that the drawings are not necessarily drawn to scale. In the drawings:
[0021] Figure 1 is a structural schematic view of an adjusting device for reducing large temperature difference fluctuation of steam turbine startup according to a preferred embodiment of the present application;
[0022] Figure 2 is Figure 1 is an enlarged view of the steam supply mechanism shown in Fig. 1;
[0023] Figure 3 is Figure 1 is an enlarged view of the drain expansion mechanism shown in Fig. 1.
[0024] In the drawings, the reference signs are explained as follows:
[0025] 1, steam supply mechanism; 2, drain expansion mechanism; 3, condensing mechanism; 11, boiler; 12, interlayer;
[0026] 13, steam outlet pipe; 14, steam return pipe; 15, first liquid discharge pipe; 16, second liquid discharge pipe; 17, cylinder;
[0027] 18, high discharge check valve; 21, drain expansion vessel; 22, water inlet pipe; 23, water outlet pipe; 24, steam outlet pipe; 25, first pressure gauge; 30, second pressure gauge; 31, condenser; 32, liquid supply pipe; 33, liquid return pipe; 34, deaerator; 131, steam valve; 132, three-way joint; 133, first section pipe; 134, second section pipe; 151, first valve; 152, second valve; 161, throttle plate; 162, electric drain valve. DETAILED DESCRIPTION
[0028] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.
[0029] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0030] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.
[0031] As shown in Figure 1 and Figure 2 and Figure 3 A kind of to reduce the regulating device of turbine start temperature difference fluctuation, including steam supply mechanism 1, drain expansion mechanism 2 and condensing mechanism 3, steam supply mechanism 1 is used to supply steam to generate electricity, and the steam of low temperature is reheated again, drain expansion mechanism 2 collects high-pressure liquid generated from steam supply mechanism 1, drain expansion mechanism 2 is divided into steam and liquid, steam flows to the steam side of condensing mechanism 3, liquid flows to the liquid side of condensing mechanism 3, condensing mechanism 3 cools steam into liquid, which is pumped out by condensate pump.
[0032] The steam supply mechanism 1 comprises a boiler 11, a jacket 12, a steam outlet pipe 13, a steam return pipe 14, a first liquid discharge pipe 15 and a second liquid discharge pipe 16. The steam outlet pipe 13 is connected to the boiler 11 and the jacket 12 at two ends respectively. The low-temperature steam from the boiler 11 enters the jacket 12 through the steam outlet pipe 13, and the jacket 12 is used to heat the steam cylinder (not shown in the figure). The high-temperature steam in the jacket 12 is heated to low-temperature steam after heat exchange, and the low-temperature steam returns to the boiler 11 through the steam return pipe 14 to be heated again.
[0033] The steam outlet pipe 13 is provided with a steam valve 131 at the steam outlet end of the steam outlet pipe 13. In this example, the steam valve 131 is arranged on the second section pipe 134. The steam valve 131 is used to adjust the amount of steam. After the steam turbine is stopped, the cooling liquid has accumulated in the steam outlet pipe 13. When the steam turbine is restarted, the steam valve 131 is closed. At this time, the steam and the cooling liquid in the steam outlet pipe 13 flow at the same time. The steam is above the cooling liquid, and the steam and the liquid are separated. However, the temperature of the cooling liquid will rise, and the liquid will mainly flow into the first liquid discharge pipe 15 and then into the water inlet pipe 22. The second liquid discharge pipe 16 mainly collects the cooling liquid in the jacket 12 and the cooling liquid in the second section pipe 134, and then enters the water inlet pipe 22 through the second liquid discharge pipe 16. Finally, the steam and the liquid enter the steam trap expander 21.
[0034] After the steam valve 131 is closed for a set time, the liquid in the steam outlet pipe 13 is discharged, and then the steam valve 131 is opened. The steam in the steam outlet pipe 13 flows upward, and the steam enters the jacket 12 to heat the steam cylinder.
[0035] The first liquid discharge pipe 15 is provided with a first valve 151 and a second valve 152. After the liquid in the steam outlet pipe 13 is discharged, the first valve 151 and the second valve 152 are closed. In this way, the steam in the steam outlet pipe 13 will not flow into the first liquid discharge pipe 15. The double closure of the first valve 151 and the second valve 152 can more effectively prevent the steam from entering the first liquid discharge pipe 15 and reduce steam loss. When the liquid in the steam outlet pipe 13 is to be discharged, the first valve 151 and the second valve 152 are opened at the same time.
[0036] The second drain pipe 16 is provided with a throttle plate 161 and an electric drain valve 162. The throttle plate 161 is located at the liquid outlet side of the second drain pipe 16, and the electric drain valve 162 is located at the liquid inlet side of the second drain pipe 16. In this case, the electric drain valve 162 is located above the throttle plate 161. When the steam turbine is restarted, the electric drain valve 162 is opened, and the steam valve 131 is closed. The liquid in the second section pipe 134 has flowed back to the second drain pipe 16. The second drain pipe 16 is filled with steam. To prevent excessive loss of steam, the throttle plate 161 is added. The throttle plate 161 is provided with a plurality of through holes. In this way, the liquid passing through the through holes forms atomized gas. The liquid pressure in the second drain pipe 16 is increased, and the drainage speed is fast. The opening and closing actions of the electric drain valve 162 are consistent with the opening and closing actions of the first valve 151 and the second valve 152.
[0037] The steam supply mechanism 1 further includes a cylinder 17. The cylinder 17 is arranged in the interlayer 12. The cylinder 17 is used to assist steam extraction, so that the steam in the steam outlet pipe 13 and the steam return pipe 14 flows quickly.
[0038] The steam supply mechanism 1 further includes a high-pressure discharge check valve 18. The high-pressure discharge check valve 18 is arranged on the steam return pipe 14. The high-pressure discharge check valve 18 prevents high-temperature steam from flowing backward.
[0039] The drain expansion mechanism 2 includes a drain expansion vessel 21, a water inlet pipe 22, and a water outlet pipe 23. The first drain pipe 15 is connected to the steam outlet pipe 13 and the water inlet pipe 22 at both ends, respectively. The second drain pipe 16 is connected to the steam outlet pipe 13 and the water inlet pipe 22 at both ends, respectively. In this case, the steam outlet pipe 13 is divided into a first section pipe 133 and a second section pipe 134. The first section pipe 133 and the second section pipe 134 are connected through a three-way joint 132. The second drain pipe 16 communicates with the three-way joint 132. The water inlet pipe 22 communicates with the drain expansion vessel 21.
[0040] The drain expansion vessel 21 is provided with a first pressure gauge 25. The first pressure gauge 25 is used to monitor the pressure in the drain expansion vessel 21.
[0041] The drain expansion mechanism 2 further includes a steam outlet pipe 24. The steam outlet pipe 24 is connected to the drain expansion vessel 21 and the condenser 31 at both ends, respectively. When the liquid enters the drain expansion mechanism 2, part of the steam enters the steam outlet pipe 24, and then enters the condenser 31 through the steam outlet pipe 24. The steam is cooled and condensed into liquid in the condenser 31, and the liquid is collected in the liquid area of the condenser 31.
[0042] The condensing mechanism 3 comprises a condenser 31 and a liquid supply pipe 32, the outlet pipe 23 is communicated with the steam expansion vessel 21 and the condenser 31 respectively, the liquid from the inlet pipe 22 into the steam expansion vessel 21 is high temperature and high pressure, so the liquid in the steam expansion vessel 21 generates partial gasification, generates partial steam, the residual liquid flows into the condenser 31 through the outlet pipe 23, the liquid in the condenser 31 is further cooled, and the cooled liquid returns to the boiler 11 through the liquid supply pipe 32.
[0043] The condensing mechanism 3 further comprises a liquid return pipe 33, the liquid return pipe 33 is communicated with the steam expansion vessel 21 and the condenser 31 respectively, because the liquid from the inlet pipe 22 into the steam expansion vessel 21 is high temperature and high pressure and a small amount of steam, and the liquid in the condenser 31 is lower in temperature, so a small amount of liquid flows out of the condenser 31, sprays atomized gas through the liquid return pipe 33, and the atomized gas cools the steam and the high temperature liquid in the steam expansion vessel 21.
[0044] The liquid return pipe 33 is provided with a second pressure gauge 30, the second pressure gauge 30 is used for monitoring the pressure in the liquid return pipe 33, and prevents the pressure in the liquid return pipe 33 from being too large.
[0045] The condensing mechanism 3 further comprises a deaerator 34, the deaerator 34 is arranged on the liquid supply pipe 32, and the deaerator 34 is used for removing oxygen in the liquid in the liquid supply pipe 32.
[0046] The above embodiment is only for describing the technical concept and characteristics of the utility model, and the purpose is to enable the person skilled in the art to understand the content of the utility model and to implement it, and cannot limit the protection scope of the utility model, and any equivalent changes or modifications according to the spirit and essence of the utility model should be covered in the protection scope of the utility model.
Claims
1. A regulating device for reducing large temperature difference fluctuation during start-up of a steam turbine, comprising a steam supply mechanism (1), a drain expansion mechanism (2) and a condensing mechanism (3), characterized in that, the steam supply mechanism (1) comprises a boiler (11), a jacket (12), a steam outlet pipe (13), a steam return pipe (14), a first drain pipe (15) and a second drain pipe (16), the steam outlet pipe (13) is connected to the boiler (11) and the jacket (12) at both ends, the steam return pipe (14) is connected to the boiler (11) and the jacket (12) at both ends, and the jacket (12) is used for heating a cylinder; the drain expansion mechanism (2) comprises a drain expansion vessel (21), a water inlet pipe (22) and a water outlet pipe (23), the first drain pipe (15) is connected to the steam outlet pipe (13) and the water inlet pipe (22) at both ends, the second drain pipe (16) is connected to the steam outlet pipe (13) and the water inlet pipe (22) at both ends, and the water inlet pipe (22) is connected to the drain expansion vessel (21); the condensing mechanism (3) comprises a condenser (31) and a liquid supply pipe (32), the water outlet pipe (23) is connected to the drain expansion vessel (21) and the condenser (31) at both ends, and the liquid supply pipe (32) is connected to the condenser (31) and the boiler (11) at both ends; a steam valve (131) is arranged on the steam outlet pipe (13), and the steam valve (131) is located at the steam outlet end of the steam outlet pipe (13).
2. The control device for reducing the fluctuation of temperature difference at the start of a steam turbine according to claim 1, wherein a first valve (151) and a second valve (152) are arranged on the first drain pipe (15).
3. The control device for reducing the fluctuation of temperature difference at the start of a steam turbine according to claim 1, wherein a throttling plate (161) and an electric drain valve (162) are arranged on the second drain pipe (16), the throttling plate (161) is located at the liquid outlet side of the second drain pipe (16), and the electric drain valve (162) is located at the liquid inlet side of the second drain pipe (16).
4. The control device for reducing the fluctuation of temperature difference at the start of a steam turbine according to claim 1, wherein the steam supply mechanism (1) further comprises a cylinder (17), and the cylinder (17) is arranged in the jacket (12).
5. The control device for reducing the fluctuation of temperature difference at the start of a steam turbine according to claim 1, wherein the steam supply mechanism (1) further comprises a high discharge check valve (18), and the high discharge check valve (18) is arranged on the steam return pipe (14).
6. The control device for reducing the fluctuation of temperature difference at the start of a steam turbine according to claim 1, wherein the drain expansion mechanism (2) further comprises a steam outlet pipe (24), and the steam outlet pipe (24) is connected to the drain expansion vessel (21) and the condenser (31) at both ends.
7. The control device for reducing the fluctuation of temperature difference at the start of a steam turbine according to claim 1, wherein the condensing mechanism (3) further comprises a liquid return pipe (33), and the liquid return pipe (33) is connected to the drain expansion vessel (21) and the condenser (31) at both ends.
8. The control device for reducing the fluctuation of temperature difference at the start of a steam turbine according to claim 1, wherein the condensing mechanism (3) further comprises a deaerator (34), and the deaerator (34) is arranged on the liquid supply pipe (32).