CN212777273U - Device for regulating temperature of final-stage reheater - Google Patents
Device for regulating temperature of final-stage reheater Download PDFInfo
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- CN212777273U CN212777273U CN202021623498.4U CN202021623498U CN212777273U CN 212777273 U CN212777273 U CN 212777273U CN 202021623498 U CN202021623498 U CN 202021623498U CN 212777273 U CN212777273 U CN 212777273U
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- reheater
- temperature
- piston rod
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- 230000001105 regulatory effect Effects 0.000 title claims description 6
- 239000000779 smoke Substances 0.000 claims abstract description 25
- 239000012774 insulation material Substances 0.000 claims description 3
- 230000003750 conditioning effect Effects 0.000 claims 3
- 230000004888 barrier function Effects 0.000 claims 2
- 238000010438 heat treatment Methods 0.000 abstract description 13
- 230000007774 longterm Effects 0.000 abstract description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 16
- 239000003546 flue gas Substances 0.000 description 16
- 235000019504 cigarettes Nutrition 0.000 description 11
- 238000000034 method Methods 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000002893 slag Substances 0.000 description 5
- 238000004880 explosion Methods 0.000 description 3
- 238000013021 overheating Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000008642 heat stress Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
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Abstract
The utility model discloses a temperature adjusting device of a final-stage reheater, which comprises a controller, a rotating motor, a driving wheel, a driven wheel, a hydraulic cylinder piston rod, a smoke baffle and a power box for supplying electric energy, wherein, the smoke-proof baffle is positioned between the high-temperature superheater and the final-stage reheater in the horizontal flue of the boiler, the output shaft of the rotating electrical machine is connected with the driving wheel, the driving wheel is matched with the driven wheel, the driven wheel is connected with the upper end of the smoke-proof baffle, one end of the piston rod of the hydraulic cylinder is matched with the hydraulic cylinder, the other end of the piston rod of the hydraulic cylinder is inserted into the horizontal flue of the boiler and then is connected with the smoke-proof baffle, the controller is connected with the control end of the hydraulic cylinder, the device can effectively relieve the phenomenon that the heating surface of the final-stage reheater is stained and slagging in the long-term high-load operation state of the boiler, and improve the operation safety and reliability of the unit.
Description
Technical Field
The utility model belongs to the technical field of coal fired boiler receives hot side temperature control, a device of final stage reheater temperature regulation is related to.
Background
In recent years, the power industry develops rapidly, and supercritical and ultra-supercritical thermal power generating units become active main units in China. With the development of power station boilers towards high parameters and large capacity, the problems of steam temperature deviation and overheating of a heating surface caused by unbalanced combustion in the boiler become more serious day by day, and the problems become one of the main problems influencing the safe and stable operation of a unit. Meanwhile, due to the change of a power utilization structure, the civil electric quantity is continuously increased, the peak-to-valley difference of a power grid is gradually increased, the thermal power generating unit takes more peak regulation tasks while carrying basic load, and the frequent load lifting brings adverse effects to the regulation of the steam temperature.
Uneven distribution of flue gas flow velocity and flue gas temperature in a boiler heating surface area can cause uneven heat absorption of heating surfaces such as a platen superheater, a high-temperature superheater and a final-stage reheater, and overhigh steam temperature can accelerate creep deformation of metal materials of the heat exchanger, so that extra thermal stress is generated on the pipe walls of the superheater and the reheater, the service life of equipment is shortened, and overtemperature or even pipe explosion of the heating surfaces can be caused after long-term operation; the steam temperature is too low, which causes the steam humidity of the last stage of the steam turbine to increase, the erosion of the blades of the steam turbine is aggravated, and the water hammer phenomenon occurs in severe cases. In order to control the temperature of the pipe wall within a reasonable range, the temperature of main steam and the temperature of reheated steam are generally required to be reduced, and meanwhile, when the deviation of the temperature of smoke on two sides of a boiler is large, the amount of desuperheating water cannot be reasonably controlled, so that the overall operation economy of a unit is reduced.
The method for regulating the steam temperature mainly comprises two main types of steam side regulation and flue gas side regulation, the regulation mode of the steam temperature of the final-stage reheater usually mainly adopts the flue gas side regulation, the common method comprises flue gas recirculation, flue baffle separation and flame center position change, and meanwhile, the reheater accident water spray desuperheater can be arranged for emergency accident working conditions, quick variable load working conditions or other unstable working conditions. The adjusting method has the problems of different degrees in the operation process of the existing unit: if the gas temperature is adjusted by adopting a flue separating baffle method, the viscosity is too high, the opening degree of the baffle is in nonlinear relation with the gas temperature, and the baffle only has good adjusting effect within a certain opening degree range; the adjusting method for changing the flame center has high sensitivity, small time lag and low precision, and various adverse factors cause difficulty in adjusting the final reheating steam temperature in the process of quickly changing the load of the unit.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a device of final stage reheater temperature regulation, the device can effectively alleviate the long-term high load running state of boiler down the final stage reheater receives the hot side to stain slagging scorification phenomenon, improves unit operation fail safe nature.
In order to achieve the above object, the device of final stage reheater temperature regulation include the controller, the rotating electrical machines, the action wheel, from the driving wheel, the pneumatic cylinder piston rod, hide the cigarette baffle and be used for providing the power supply box of electric energy, wherein, hide the cigarette baffle and be located in the horizontal flue of boiler between high temperature over heater and the final stage reheater, the output shaft of rotating electrical machines is connected with the action wheel, the action wheel cooperatees with from the driving wheel, be connected with the upper end that hides the cigarette baffle from the driving wheel, the one end and the pneumatic cylinder of pneumatic cylinder piston rod cooperate, the other end of pneumatic cylinder piston rod inserts and is connected with hiding the cigarette baffle behind the horizontal flue of boiler, the controller is connected with the.
An output shaft of the rotating motor is connected with the driving wheel through a first connecting rod.
The driven wheel is connected with the upper end of the smoke shielding baffle through a second connecting rod.
The smoke shielding baffle and the connecting position of the hydraulic cylinder piston rod and the horizontal flue of the boiler are all wrapped with heat insulation material layers.
The driving wheel is matched with the driven wheel through threads.
The tip of pneumatic cylinder piston rod is provided with the ear seat, and the ear seat is connected with the upper end of keeping out the cigarette baffle.
The rotating motor is fixed on the outer wall of the horizontal flue of the boiler through the power box.
The utility model discloses following beneficial effect has:
device of final stage re-heater temperature regulation when concrete operation, when the slag bonding of final stage re-heater is serious, the pneumatic cylinder promotes the pneumatic cylinder piston rod and stretches out, will hide the preceding windward side of cigarette baffle whereabouts to the final stage re-heater, shelter from high temperature flue gas through hiding the cigarette baffle, reduce the convective heat transfer of final stage re-heater and high temperature flue gas, it attaches to the heating surface pipe wall department at the final stage re-heater to block flying dust granule and molten state alkali metal in the flue gas, alleviate the slag bonding of staiing of final stage re-heater heating surface, effectively alleviate the boiler and stain the slag bonding phenomenon of final stage re-heater heating surface under the long-term high load running state. In addition, when steam temperature deviation on two sides of the final-stage reheater is overlarge, the rotary motor drives the smoke shielding baffle to rotate in the horizontal flue, an included angle between the smoke shielding baffle and the incoming flow direction of flue gas is changed, the convection heat exchange quantity between the final-stage reheater and high-temperature flue gas is adjusted, then the outlet temperature of the final-stage reheater is adjusted, the water spray quantity of accident desuperheating water of the final-stage reheater is reduced, the economical efficiency of a boiler is improved, meanwhile, smoke temperature deviation and flow field unevenness on two sides of a hearth are reduced, the phenomenon of pipe explosion frequency caused by local metal overheating and overtemperature of the final-stage reheater is avoided, and.
Drawings
FIG. 1 is a view of the installation position of the present invention;
FIG. 2 is a schematic structural view of the present invention;
fig. 3 is a schematic operation diagram of the present invention.
Wherein, 1 is an economizer, 2 is a furnace water wall, 3 is a low-temperature superheater, 4 is a screen superheater, 5 is a high-temperature superheater, 6 is a low-temperature reheater, 7 is a final-stage reheater, 81 is a power box, 82 is a rotating motor, 83 is a driving wheel, 84 is a driven wheel, 85 is a hydraulic cylinder, 86 is a hydraulic cylinder piston rod, 87 is an ear seat, and 88 is a smoke shielding baffle plate.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1 and 2, a is in fig. 1 the utility model discloses a device of final stage reheater temperature regulation include the controller, the rotating electrical machines 82, action wheel 83, from driving wheel 84, pneumatic cylinder 85, pneumatic cylinder piston rod 86, hide cigarette baffle 88 and be used for providing power supply box 81 of electric energy, wherein, it is located between high temperature superheater 5 and the final stage reheater 7 in the horizontal flue of boiler to hide cigarette baffle 88, the output shaft of rotating electrical machines 82 is connected with action wheel 83, action wheel 83 cooperatees with from driving wheel 84, from driving wheel 84 being connected with the upper end that hides cigarette baffle 88, the one end of pneumatic cylinder piston rod 86 cooperatees with pneumatic cylinder 85, the other end of pneumatic cylinder piston rod 86 is inserted in the horizontal flue of boiler back and is connected with hiding cigarette baffle 88, the controller is connected with the control end of pneumatic cylinder 85 and the control end of rotating electrical.
An output shaft of the rotating motor 82 is connected with the driving wheel 83 through a first connecting rod; the driven wheel 84 is connected with the upper end of the smoke baffle 88 through a second connecting rod; the smoke shielding baffle 88 and the connecting position of the hydraulic cylinder piston rod 86 and the boiler horizontal flue are wrapped with heat insulation material layers; the driving wheel 83 is matched with the driven wheel 84 through threads; an ear seat 87 is arranged at the end part of the hydraulic cylinder piston rod 86, and the ear seat 87 is connected with the upper end of the smoke shielding baffle 88; the rotary motor 82 is fixed to the outer wall of the horizontal flue of the boiler through a power box 81.
The utility model discloses a concrete working process does:
high-temperature flue gas generated after fuel combustion firstly transfers heat to a hearth water-cooled wall 2 and a screen superheater 4, then enters a shaft flue after sequentially passing through a high-temperature superheater 5 and a final-stage reheater 7 by a horizontal flue, a partition wall in the shaft flue divides the flue into a front parallel flue and a rear parallel flue, a low-temperature reheater 6 is arranged in the front flue, and a low-temperature superheater 3 and an economizer 1 are arranged in the rear flue, wherein a smoke shielding baffle 8 is positioned between the high-temperature superheater 5 and the final-stage reheater 7 in the horizontal flue;
in the normal operation process of the boiler, the pipe wall of the final-stage reheater 7 has no overtemperature phenomenon, the steam temperature deviation at the outlet of the final-stage reheater 7 is in a design range, and a device for regulating the temperature of the final-stage reheater is not required to be put into use under the condition that the heating surface of the final-stage reheater 7 is not seriously polluted and slag-bonded;
when the boiler runs at high load for a long time, because the average heat load in the boiler is large and the heat load value is preset, when the slag bonding of the final reheater 7 is serious, the hydraulic cylinder 85 is controlled to work, the hydraulic cylinder 85 drives the hydraulic cylinder piston rod 86 to extend out, the hydraulic cylinder piston rod 86 drives the smoke shielding baffle 88 to fall to the front windward side of the final reheater 7, high-temperature flue gas is shielded by the smoke shielding baffle 88, the convection heat exchange between the final reheater 7 and the high-temperature flue gas is reduced, fly ash particles and molten alkali metal in the flue gas are prevented from being attached to the pipe wall of the heating surface of the final reheater 7, and the contamination and slag bonding of the heating surface of the; when the pipe wall of the final-stage reheater 7 is over-temperature, the pipe wall over-temperature phenomenon is relieved through the opening degree of the smoke shielding baffle 88;
when the boiler is in variable load or deep peak regulation operation, the flame fullness in the hearth is not high, and because the final reheaters 7 on two sides of the uneven heat load distribution easily generate the problems of heat deviation, unbalanced heat stress and the like, the pipe wall of a heating surface is easily cracked due to long-term heat deviation, and local metal overheating and overtemperature, even pipe explosion are caused in serious conditions. When the steam temperature deviation on the two sides of the final reheater 7 is too large, the hydraulic cylinder 85 is controlled to work, the hydraulic cylinder 85 drives the hydraulic cylinder piston rod 86 to extend out, the hydraulic cylinder piston rod 86 drives the smoke shielding baffle 88 to fall to the front windward side of the final reheater 7, then the rotary motor 82 is controlled to work, the rotary motor 82 drives the driving wheel 83 to rotate, the driving wheel 83 drives the driven wheel 84 to rotate, the driven wheel 84 drives the smoke shielding baffle 88 to rotate in the horizontal flue, the included angle between the smoke shielding baffle 88 and the flue gas inflow direction is changed, so that the convection heat exchange quantity between the final reheater 7 and high-temperature flue gas is adjusted, the outlet temperature of the final reheater 7 is adjusted, the final stage desuperheating water spraying quantity of the final reheater 7 is.
Through practice, the utility model discloses can effectually keep receiving the hot side clean, can reduce the heating surface convection heat transfer volume simultaneously, guarantee to receive hot side safety, improve boiler safety and stability operating duration, improve unit efficiency.
Claims (7)
1. A temperature adjusting device of a final-stage reheater is characterized by comprising a controller, a rotating motor (82), a driving wheel (83), a driven wheel (84), a hydraulic cylinder (85), a hydraulic cylinder piston rod (86), a smoke shielding baffle plate (88) and a power box (81) for providing electric energy, the smoke shielding baffle (88) is positioned between the high-temperature superheater (5) and the final-stage reheater (7) in the horizontal flue of the boiler, an output shaft of the rotating motor (82) is connected with the driving wheel (83), the driving wheel (83) is matched with the driven wheel (84), the driven wheel (84) is connected with the upper end of the smoke shielding baffle (88), one end of a hydraulic cylinder piston rod (86) is matched with the hydraulic cylinder (85), the other end of the hydraulic cylinder piston rod (86) is inserted into the horizontal flue of the boiler and then is connected with the smoke shielding baffle (88), and the controller is connected with the control end of the hydraulic cylinder (85) and the control end of the rotating motor (82).
2. The final reheater temperature regulating apparatus according to claim 1, characterized in that the output shaft of the rotary electric machine (82) is connected to the drive wheel (83) by a first link.
3. The final reheater temperature conditioning apparatus of claim 2 wherein the driven pulley (84) is connected to the upper end of the smoke barrier (88) by a second link.
4. The final reheater temperature conditioning apparatus of claim 1 wherein the smoke barrier (88) and the connection between the hydraulic cylinder piston rod (86) and the boiler horizontal flue are coated with a layer of insulation material.
5. The final reheater temperature conditioning apparatus of claim 1 wherein the drive pulley (83) is threadably engaged with the driven pulley (84).
6. The final reheater temperature regulating apparatus according to claim 1, characterized in that the end of the hydraulic cylinder piston rod (86) is provided with a lug (87), and the lug (87) is connected to the upper end of a smoke baffle (88).
7. The apparatus for temperature regulation of a final stage reheater according to claim 1, wherein the rotary electric machine (82) is fixed to an outer wall of the horizontal flue of the boiler through a power supply box (81).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021623498.4U CN212777273U (en) | 2020-08-06 | 2020-08-06 | Device for regulating temperature of final-stage reheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021623498.4U CN212777273U (en) | 2020-08-06 | 2020-08-06 | Device for regulating temperature of final-stage reheater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212777273U true CN212777273U (en) | 2021-03-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021623498.4U Active CN212777273U (en) | 2020-08-06 | 2020-08-06 | Device for regulating temperature of final-stage reheater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212777273U (en) |
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2020
- 2020-08-06 CN CN202021623498.4U patent/CN212777273U/en active Active
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