CN201661321U - Lower-half cylinder temperature compensating device - Google Patents
Lower-half cylinder temperature compensating device Download PDFInfo
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- CN201661321U CN201661321U CN2010201119424U CN201020111942U CN201661321U CN 201661321 U CN201661321 U CN 201661321U CN 2010201119424 U CN2010201119424 U CN 2010201119424U CN 201020111942 U CN201020111942 U CN 201020111942U CN 201661321 U CN201661321 U CN 201661321U
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- electric heating
- temperature
- heating tube
- half cylinder
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Abstract
The utility model discloses a lower-half cylinder temperature compensating device which mainly comprises an electric heating pipe fixedly arranged at the outer side of a lower-half cylinder. A heat-preservation layer is arranged outside the electric heating pipe. The electric heating pipe can be easily controlled, has good heating effect, and can effectively heat the lower-half cylinder so as to eliminate the temperature difference of upper/lower-half cylinders. A temperature measuring element can be a thermocouple, a platinum resistor, a copper resistor, a heat-sensitive resistor and the like. The lower-half cylinder temperature compensating device can heat the lower-half cylinder in an all-round manner, and the heating is more uniform; by carrying out good closed-loop control on the detection of the temperature difference of the upper/lower-half cylinders, the lower-half cylinder temperature compensating device can effectively eliminate the temperature difference of the upper/lower-half cylinders, so as to avoid various running problems caused by the temperature difference, thereby ensuring safety running of a steam turbine.
Description
Technical field
The utility model relates to the steam turbine equipment field, especially a kind of lower-half cylinder temperature compensation device of cylinder.
Background technique
Steam turbine advances to join the vapour degree and generally all concentrates on first cylinder, most of steam turbine adopts the upper half admission, therefore the start up period of steam turbine,, reach under the conduction of heat of air chamber because the cylinder internal flow field is inhomogeneous, the temperature difference of cylinder can be very big up and down, even adopt the full admission structure, also directly be with one section guide blade carrier behind the air chamber, the phenomenon that the temperature difference of cylinder is big exists too up and down, in the High Temperature High Pressure unit, this situation is more outstanding especially.The temperature difference of cylinder badly influences the unit dynamic and static gaps greatly up and down, and special in the bigger unit of relative pitch, rotor bow is bigger, and the bigger temperature difference causes that easily the labyrinth strip and the rotor of stator bottom collide in the cylinder up and down, influences the safe operation of unit; In addition, in docking process, because first is fast for second cooling raio, the centre is gone up second temperature difference for some time can be bigger, sound take place to be wiped and to be bumped, and nearly about one hour rotor can't jiggering, wait be cooled to a certain degree, go up second temperature difference and reduce after, could continue jiggering, this has brought very big inconvenience to use.In order to make the operation of the normal safety of steam turbine, people attempt to adopt the method for warming-up to solve the temperature difference problem that goes up second cylinder, but during warming-up, steam flow heats mainly for first cylinder, and first also has the transmission of heat heating from air chamber, because the cylinder body flow field is inhomogeneous, prolongation along with warm-up period, the temperature difference that goes up second increases on the contrary, maximum temperature difference surpasses 75 ℃ of meetings, its result directly causes shaft vibration sharply to increase, can't normal boot-strap, so the method for the warming-up that people adopt usually can't be eliminated the temperature difference problem of second cylinder.For the safe operation of unit, second cylinder of countercylinder heats, and it is just necessary that second temperature difference of the cylinder is in the scope of permission all the time.
Summary of the invention
The purpose of this utility model is the lower-half cylinder temperature compensation device of cylinder that second cylinder of a kind of countercylinder of providing for the deficiency that solves above-mentioned technology heats, can effectively eliminate the temperature difference problem of second cylinder.
In order to achieve the above object, the lower-half cylinder temperature compensation device of cylinder that the utility model is designed, it mainly comprises electric heating tube, and described electric heating tube is fixedly installed on the outside of second cylinder of cylinder, and described electric heating tube is provided with thermal insulation layer outward.Electric heating tube is easy to control, and heats is good, but second cylinder of countercylinder effectively heats the temperature difference of cylinder about eliminating.Described temperature measuring element can be thermocouple, platinum resistor, copper resistance, thermistor etc.
Preferred scheme is that described thermal insulation layer is the rare earth layer.Rare earth layer plasticity is good, applicable to the curved design of casing surface complexity, and with the insulation surface stronger adhesion strength is arranged, and does not ftracture, and does not come off, and surfacing is attractive in appearance, and long service life, comprehensive heat-insulating property are good.
As preferably, described electric heating tube is the coil-like outer surface that is coated on second cylinder of cylinder of being close to, be provided with the press strip that matches with second cylinder shape of cylinder in the outside of described electric heating tube, second cylinder of this press strip and cylinder is located by connecting, and electric heating tube is fixed between press strip and second cylinder of cylinder.The described preferred scheme that is located by connecting is to be welded with bolt on second cylinder outer surface of described cylinder, and this bolt the other end connects press strip.Comparatively simple and convenient when adopting this mounting type to install, and fixed effect is better.
As preferably, described electric heating tube is controlled by a temperature controlling device, be provided with temperature measuring element respectively in the bottom of first cylinder top of described cylinder and second cylinder or at the flange place of cylinder up and down, or all be provided with temperature measuring element on both aforementioned, described temperature measuring element is connected with temperature controlling device, and provide the temperature signal of second cylinder on the cylinder for it, can obtain the temperature difference of second cylinder on the cylinder thus, by the temperature difference as control signal, electric heating tube is carried out closed loop control effectively, described closed loop control can be adopted PID control, and is more reliable effective.Wherein said temperature controlling device can comprise the regulator (as the silicon-controlled voltage regulation device) that is used to calculate the controller of the temperature difference, control output and is applicable to electric heating tube, also can realize the circuit module composition of this function, this temperature controlling device belongs to routine techniques in the electrical control field, do not do tired stating at this.
As preferably, described electric heating tube is controlled by a temperature controlling device, is provided with temperature measuring element between second cylinder of cylinder and thermal insulation layer, and this temperature measuring element is connected with temperature controlling device, and provides the temperature signal of second cylinder of cylinder for it.Can second cylinder temperature of cylinder be that control signal is carried out closed loop control effectively to electric heating tube, eliminate the temperature difference.Wherein, described electric heating tube can be made of the heating pipe monomer of fixed qty, described heating pipe monomer is the coil-like outer surface that is arranged on second cylinder of cylinder, is provided with the temperature measuring element that matches with this heating pipe monomer between each second cylinder of heating pipe monomer and cylinder.
Can guarantee cylinder safety again when reaching heats, drawing through a large amount of experiments that described electric heating tube power can be 3.8KW, adopts the electric heating tube of this power, when heating with full power, cylinder can heat up in 60min 75 ℃, guarantees heats; And the heating pipe surface temperature is lower than 485 ℃ when exposed fully, this temperature is lower than the tempering temperature of casing materials, and countercylinder is safe.
The lower-half cylinder temperature compensation device of cylinder that the utility model obtains, but second cylinder of countercylinder carries out omnibearing heating, heat more even, good closed loop control is carried out in temperature difference detection by cylinder about the countercylinder, can effectively eliminate the temperature difference phenomenon of second cylinder on the cylinder, thereby the various operation problems of having avoided in the past therefore phenomenon and having caused are guaranteed the steam turbine safe operation.
Description of drawings
Fig. 1 is embodiment 1 a structural representation;
Fig. 2 is the enlarged view at X place among Fig. 1;
Fig. 3 be among Fig. 1 U to unfolded drawing;
Fig. 4 is the fundamental diagram of temperature controlling device;
Fig. 5 is embodiment 1 a control schematic representation.
Among the figure: electric heating tube 1, second cylinder 2 of cylinder, rare earth layer 3, heating pipe monomer 4, press strip 5, bolt 6, bidirectional triode thyristor 7, temperature measuring element 8, temperature controlling device 9, first cylinder 10 of cylinder.
Embodiment
The utility model will be further described in conjunction with the accompanying drawings below by embodiment.
Embodiment 1
As shown in Figure 1, 2, the described lower-half cylinder temperature compensation device of cylinder of present embodiment, it mainly comprises electric heating tube 1, described electric heating tube 1 is fixedly installed on the outside of second cylinder 2 of cylinder, be provided with thermal insulation layer outside the described electric heating tube 1, described thermal insulation layer is a rare earth layer 3.As shown in Figure 3, described electric heating tube 1 is made of heating pipe monomer 4, described heating pipe monomer 4 is the coil-like outer surface that is arranged on second cylinder 2 of cylinder, be provided with the press strip 5 that matches with second cylinder 2 shapes of cylinder in the outside of described electric heating tube 1, this press strip 5 is located by connecting with second cylinder 2 of cylinder, and electric heating tube 1 is fixed between press strip 5 and second cylinder 2 of cylinder.Described being located by connecting is to be welded with bolt 6 on second cylinder 2 outer surfaces of described cylinder, these bolt 6 the other ends connect press strip 5, realize electric heating tube 1 fixing thus, shown in Fig. 4,5, described electric heating tube 1 is controlled by a temperature controlling device 9, bottom at first cylinder 10 tops of described cylinder and second cylinder 2 is respectively equipped with temperature measuring element 8, and described temperature measuring element 8 is connected with temperature controlling device 9, and provides the temperature signal of second cylinder 2 on the cylinder for it.When the casing wall temperature difference of top and bottom greater than 50 ℃, temperature control module starts electric heating tube 1 automatically, electric heating tube 1 gives cylinder second heating, and sends the working state signal of each heating pipe to the Operation Centre.When the casing wall temperature difference of top and bottom is closed electric heating tube 1 automatically less than 25 ℃ of temperature control modules, cut off the heating pipe power supply and send the signal of normally closing electric heating tube 1 to the Operation Centre simultaneously.Wherein the temperature adjustment technology of electric heating tube 1 is a routine techniques, can implement in conjunction with Fig. 4 electric field those of ordinary skill, does not do tired stating at this.
Wherein said temperature measuring element 8 also can be arranged on the flange place of cylinder up and down, specifically can be positioned at the casing wall center of cylinder split flange up and down, when the cylinder flange place temperature difference is greater than 30 ℃ up and down, temperature controlling device 9 starts electric heating tube 1 automatically, when the cylinder flange place temperature difference was less than 15 ℃ up and down, temperature controlling device 9 was closed electric heating tube 1 automatically.
Claims (8)
1. lower-half cylinder temperature compensation device of cylinder, it mainly comprises electric heating tube (1), it is characterized in that described electric heating tube (1) is fixedly installed on the outside of second cylinder of cylinder (2), the outer thermal insulation layer that is provided with of described electric heating tube (1).
2. lower-half cylinder temperature compensation device of cylinder according to claim 1 is characterized in that described thermal insulation layer is rare earth layer (3).
3. lower-half cylinder temperature compensation device of cylinder according to claim 2, it is characterized in that described electric heating tube (1) is the coil-like outer surface that is coated on second cylinder of cylinder (2) of being close to, be provided with the press strip (5) that matches with second cylinder of cylinder (2) shape in the outside of described electric heating tube (1), this press strip (5) is located by connecting with second cylinder of cylinder (2), and electric heating tube (1) is fixed between press strip (5) and second cylinder of cylinder (2).
4. lower-half cylinder temperature compensation device of cylinder according to claim 3 is characterized in that being welded with bolt (6) on second cylinder of described cylinder (2) outer surface, and this bolt (6) the other end connects press strip (5).
5. according to claim 1 or 2 or 3 or 4 described lower-half cylinder temperature compensation device of cylinder, it is characterized in that described electric heating tube (1) is controlled by a temperature controlling device (9), be provided with temperature measuring element (8) respectively in the bottom of first cylinder top of described cylinder and second cylinder or at the flange place of upper and lower cylinder, or all be provided with temperature measuring element (8) on both aforementioned, described temperature measuring element (8) is connected with temperature controlling device (9), and provides the temperature signal of upper and lower half cylinder of cylinder for it.
6. according to claim 1 or 2 or 3 or 4 described lower-half cylinder temperature compensation device of cylinder, it is characterized in that described electric heating tube (1) is controlled by a temperature controlling device (9), between second cylinder of cylinder (2) and thermal insulation layer, be provided with temperature measuring element (8), this temperature measuring element (8) is connected with temperature controlling device (9), and provides the temperature signal of second cylinder of cylinder (2) for it.
7. lower-half cylinder temperature compensation device of cylinder according to claim 5, it is characterized in that described electric heating tube (1) is made of the heating pipe monomer (4) of fixed qty, described heating pipe monomer (4) is the coil-like outer surface that is arranged on second cylinder of cylinder (2), is provided with the temperature measuring element (8) that matches with this heating pipe monomer (4) between each heating pipe monomer (4) and second cylinder of cylinder (2).
8. according to claim 1 or 2 or 3 or 4 described lower-half cylinder temperature compensation device of cylinder, it is characterized in that described electric heating tube (1) power is 3.8KW.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201119424U CN201661321U (en) | 2010-02-11 | 2010-02-11 | Lower-half cylinder temperature compensating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201119424U CN201661321U (en) | 2010-02-11 | 2010-02-11 | Lower-half cylinder temperature compensating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201661321U true CN201661321U (en) | 2010-12-01 |
Family
ID=43231736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201119424U Expired - Lifetime CN201661321U (en) | 2010-02-11 | 2010-02-11 | Lower-half cylinder temperature compensating device |
Country Status (1)
| Country | Link |
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| CN (1) | CN201661321U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101782001A (en) * | 2010-02-11 | 2010-07-21 | 杭州汽轮机股份有限公司 | Lower-half cylinder temperature compensation device of cylinder and temperature compensation method thereof |
| EP3012415A1 (en) | 2014-10-20 | 2016-04-27 | Alstom Technology Ltd | Turbo machine with thermal expansion control and method for operating such turbo machine |
-
2010
- 2010-02-11 CN CN2010201119424U patent/CN201661321U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101782001A (en) * | 2010-02-11 | 2010-07-21 | 杭州汽轮机股份有限公司 | Lower-half cylinder temperature compensation device of cylinder and temperature compensation method thereof |
| EP3012415A1 (en) | 2014-10-20 | 2016-04-27 | Alstom Technology Ltd | Turbo machine with thermal expansion control and method for operating such turbo machine |
| US10100669B2 (en) | 2014-10-20 | 2018-10-16 | Ansaldo Energia Ip Uk Limited | Turbo machine and method for operating such turbo machine |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101201 |
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| CX01 | Expiry of patent term |