LU504588B1 - Energy-saving operation adjusting device for efficiently strengthening air preheaters and air heaters - Google Patents
Energy-saving operation adjusting device for efficiently strengthening air preheaters and air heaters Download PDFInfo
- Publication number
- LU504588B1 LU504588B1 LU504588A LU504588A LU504588B1 LU 504588 B1 LU504588 B1 LU 504588B1 LU 504588 A LU504588 A LU 504588A LU 504588 A LU504588 A LU 504588A LU 504588 B1 LU504588 B1 LU 504588B1
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- Prior art keywords
- duct
- air
- water
- air heater
- flue
- Prior art date
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- 238000005728 strengthening Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 217
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 91
- 239000003546 flue gas Substances 0.000 claims abstract description 91
- 238000010438 heat treatment Methods 0.000 claims abstract description 52
- 230000001105 regulatory effect Effects 0.000 claims abstract description 28
- 239000000428 dust Substances 0.000 claims description 9
- 238000006477 desulfuration reaction Methods 0.000 claims description 8
- 230000023556 desulfurization Effects 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
- F23L15/04—Arrangements of recuperators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L2900/00—Special arrangements for supplying or treating air or oxidant for combustion; Injecting inert gas, water or steam into the combustion chamber
- F23L2900/15043—Preheating combustion air by heat recovery means located in the chimney, e.g. for home heating devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2221/00—Pretreatment or prehandling
- F23N2221/08—Preheating the air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/08—Measuring temperature
- F23N2225/21—Measuring temperature outlet temperature
Abstract
Disclosed is an energy-saving operation adjusting device for efficiently strengthening air preheaters and air heaters, including an ash removal part, an air heater heating part, a low-pressure heating part and an air preheater; a condensate circulation loop is arranged among the air heater heating part, the low-pressure heating part and the ash removal part; and electric regulating valves are arranged on water outlet ducts of the air heater heating part. By setting the electric regulating valves at the water outlet of the air heater heating part, the problem of flue-gas temperature deviation on both sides of the air preheater is solved. The flue-gas temperature of the air preheater is effectively reduced, at the same time, the optimized energy-saving operation of the whole system is realized, and the resource consumption is reduced.
Description
ENERGY-SAVING OPERATION ADJUSTING DEVICE FOR EFFICIENTLY 0504588
STRENGTHENING AIR PREHEATERS AND AIR HEATERS
This invention relates to the technical field of energy saving of air preheaters and air heaters, and in particular to an energy-saving operation adjusting device for efficiently strengthening air preheaters and air heaters.
After the operation of the generalized air heater system, there is no automatic regulation means for the condensate heat source to pass through the air preheaters on both sides. So it is impossible to accurately control a comprehensive temperature of cold ends of the air preheaters on both sides. However, in the actual operation of a million-unit boiler, the exhaust temperature of the air preheaters on both sides is bound to be deviated due to the inconsistency of combustion adjustment, air preheater heat exchange, air leakage rate of the air preheaters and ash deposition degree in the flue of the tail shaft. In this operation mode, in order to prevent low temperature corrosion at the cold ends of the air preheaters, the permanent magnet booster pump of the air heater must be controlled by the air preheaters on the side with lower exhaust temperature, and the exhaust temperature on the other side will inevitably increase at the same time, increasing the power consumption of the permanent magnet booster pump.
How to save resources without low temperature corrosion at the cold ends of air preheaters is a pressing problem for technicians in this field.
In view of this, this invention provides an energy-saving operation adjusting device for efficiently strengthening air preheaters and air heaters, and it reduces consumption of resources under a condition of ensuring that cold ends of air preheaters does not corrode at low temperatures.
In order to achieve the above objectives, the present invention provides the following technical schemes.
Preferably, the energy-saving operation adjusting device for efficiently strengthening dir 904588 preheaters and air heaters includes an ash removal part, an air heater heating part, a low-pressure heating part and an air preheater; a flue-gas inlet of the ash removal part is connected with a flue-gas outlet at cold ends of the air preheater; an outlet of the air heater heating part is connected with an inlet of the air preheater; a condensate circulation loop is arranged among the air heater heating part, the low-pressure heating part and the ash removal part; electric regulating valves are arranged on water outlet ducts of the air heater heating part for regulating working efficiency of the air heater heating part.
Preferably, the ash removal part includes a flue-gas cooler, a dust collector, a desulfurization tower, a flue-gas reheater, a flue-gas cold water duct, a flue-gas hot water duct, a heat medium auxiliary heater and a first water pump; a flue-gas inlet of the flue-gas cooler is connected with a flue-gas outlet of the air preheater; the flue-gas cooler, the dust collector, the desulfurization tower and the flue-gas reheater are sequentially connected; one end of the flue-gas cold water duct is connected with a water inlet of the flue-gas cooler, and the other end is connected with a water outlet of the flue-gas reheater; one end of the flue-gas hot water duct is connected with the water outlet of the flue-gas cooler, and the other end is connected with the water inlet of the flue-gas reheater; the heat medium auxiliary heater is arranged on the flue-gas hot water duct; the first water pump is arranged on the flue-gas cold water duct.
Preferably, the air heater heating part includes a first air heater, a second air heater, the electric regulating valves, a first air heater duct, a second air heater duct, an air heater water outlet duct, a water replenishing duct, a first electromagnetic valve, a first temperature sensor, a first pressure sensor, a second temperature sensor, a second pressure sensor, a third temperature sensor and a fourth temperature sensor; a water outlet duct of the low-pressure heating part is connected with water inlets of the first air heater and the second air heater; the first air heater duct is connected with a water outlet of the first air heater;
the second air heater duct is connected with a water outlet of the second air heater; 0504588 the electric regulating valves are respectively arranged on the first air heater duct and the second air heater duct; one end of the air heater water outlet duct is connected with the first air heater duct and the second air heater duct, and the other end is connected with a water inlet of the low-pressure heating part; one end of the water replenishing duct is connected with the air heater water outlet duct, and the other end is connected with the flue-gas cold water duct; the first temperature sensor and the first pressure sensor are arranged on the first air heater duct; the second temperature sensor and the second pressure sensor are arranged on the second air heater duct; the first electromagnetic valve is arranged on the water replenishing duct; the third temperature sensor and the fourth temperature sensor are respectively arranged at air outlets of the first air heater and the second air heater.
Preferably, the low-pressure heating part includes a first low-pressure heater, a second low-pressure heater, a first low-pressure duct, a second low-pressure duct, a condensate heater, a first condensate duct, a second condensate duct, a third condensate duct, a permanent magnet pump, a permanent magnet pump water inlet duct, a permanent magnet pump water outlet duct, a drainage duct, a fifth temperature sensor, a third pressure sensor, a sixth temperature sensor, a fourth pressure sensor, a second water pump, a second electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve, a fifth electromagnetic valve, a sixth electromagnetic valve and a seventh electromagnetic valve; a water inlet of the first low-pressure heater is connected with the air heater water outlet duct; one end of the first low-pressure duct is connected with a water outlet of the first low-pressure heater, and the other end is connected with a water inlet of the second low-pressure heater;
one end of the second low-pressure duct is connected with a water outlet of the second” 504588 low-pressure heater, and the other end is connected with the permanent magnet pump water inlet duct; the permanent magnet pump water inlet duct, the permanent magnet pump and the permanent magnet pump water outlet duct are sequentially connected, wherein the permanent magnet pump water outlet duct is respectively connected with the water inlets of the first air heater and the second air heater; one end of the first condensate duct is connected with the air heater water outlet duct, and the other end is connected with a water inlet of the condensate heater; one end of the second condensate duct is connected with a water outlet of the condensate heater, and the other end is connected with the first low-pressure duct; one end of the third condensate duct is connected with the second condensate duct, and the other end is connected with the second low-pressure duct; one end of the drainage duct is connected with the flue-gas hot water duct, and the other end 1s connected with the permanent magnet pump water inlet duct; the second water pump and the second electromagnetic valve are arranged on the first condensate duct; the third electromagnetic valve is arranged on the second condensate duct; the fourth electromagnetic valve is arranged on the third condensate duct; the fifth electromagnetic valve is arranged on the permanent magnet pump water inlet duct; the sixth electromagnetic valve is arranged on the permanent magnet pump water outlet duct; the seventh electromagnetic valve is arranged on the drainage duct; the fifth temperature sensor and the third pressure sensor are arranged on the second low-pressure duct; the sixth temperature sensor and the fourth pressure sensor are arranged on the permanent magnet pump water outlet duct.
Preferably, the electric regulating valves include a valve body, an upper valve cover, a lower valve cover, a driving motor, a motor shell, a worm wheel, a worm, a rotating shaft, a valve core, water holes, a fixing block, buffer grooves and a buffer blade;
the valve body includes a water inlet cavity, a water outlet cavity and a driving cavity, and 504588 the water inlet cavity and the water outlet cavity are communicated through the water holes; the upper valve cover is arranged above the driving cavity and is fixedly connected with the valve body; 5 the driving motor is fixedly connected to a top of the upper valve cover, and the driving motor is externally equipped with the motor shell that is fixedly connected to the upper valve cover, one end of the worm wheel is connected with the driving motor, and the other end is meshed with the worm; the worm penetrates the upper valve cover and is fixedly connected with the rotating shaft; the rotating shaft penetrates above the water inlet cavity, and a lower end of the rotating shaft is fixedly connected with the valve core; the valve core is arranged in the water inlet cavity and rotatably connected with the valve body; the lower valve cover is arranged below the water outlet cavity and is fixedly connected with the valve body; the fixing block is arranged right below the water holes, one end of the fixing block is fixedly connected with the lower valve cover, and the other end is rotatably connected with bottoms of the buffer grooves; the buffer blade is fixedly connected to inner walls of side surfaces of the buffer grooves.
Preferably, the air inlet of the air preheater is provided with a seventh temperature sensor.
Preferably, the permanent magnet pump is connected in parallel with a standby permanent magnet pump, and a water inlet duct and a water outlet duct of the standby permanent magnet pump are respectively provided with an eighth electromagnetic valve and a ninth electromagnetic valve.
According to the technical schemes, compared with the prior art, the invention has the following beneficial effects. 1. By setting the electric regulating valves at a water outlet of the air heater, the problem of flue-gas temperature deviation on both sides of the air preheater is solved. The flue-gas temperature of the air preheater is effectively reduced, and at the same time, the optimized energy-saving operation of the whole system is realized. The resource consumption is reduced 504588 and the economic benefit is improved.
In order to explain the examples of the invention or the technical scheme in the prior art more clearly, the drawings used in the example will be briefly introduced below. Obviously, the drawings in the following description are only some examples of the invention. For ordinary technicians in the field, other drawings may be obtained according to these drawings without making creative efforts
FIG. 1 is a schematic diagram of an overall structure of the present invention.
FIG. 2 is a schematic diagram of an A mark structure of the present invention.
FIG. 3 is a schematic diagram of a B mark structure of the present invention.
FIG. 4 is a schematic structural diagram of an electric regulating valve of the present invention.
FIG. 5 is a schematic diagram of the structure of a C mark of the present invention.
FIG. 6 is a schematic structural diagram of a buffer part of the electric regulating valve according to the present invention.
Among them, 1. ash removal part; 11. flue-gas cooler;12. dust collector; 13. desulfurization tower; 14. flue-gas reheater; 15. flue-gas cold water duct; 16. flue-gas hot water duct; 17. heat medium auxiliary heater; 18. first water pump; 2. air heater heating part; 21. first air heater; 22. ; 23. electric regulating valve; 24. first air heater duct; 25. second air heater duct; 26. air heater water outlet duct; 27. water replenishing duct; 28. first electromagnetic valve, 29. first temperature sensor; 210. first pressure sensor, 211. second temperature sensor; 212. second pressure sensor; 3. low-pressure heating part; 31. first low-pressure heater, 32. second low-pressure heater; 33. first low-pressure duct; 34. second low-pressure duct; 35. condensate heater; 36. first condensate duct; 37. second condensate duct; 38. third condensate duct; 39. permanent magnet pump; 310. permanent magnet pump water inlet duct; 311. permanent magnet pump water outlet duct; 312. drainage duct; 313. fifth temperature sensor; 314. third pressure sensor; 315. sixth temperature sensor; 316. fourth pressure sensor; 317. second water pump; 318. second electromagnetic valve; 319. third electromagnetic valve; 320. fourth electromagnetic valve, 321. fifth electromagnetic valve; 322. sixth electromagnetic valve; 323. seventh electromagnetic valve; 324. standby permanent magnet pump; 325. eighth electromagnetic valve, 204088 326. ninth electromagnetic valve; 4. air preheater; 41. seventh temperature sensor; 231. valve body; 232. upper valve cover; 233. lower valve cover; 234. driving motor; 235. motor shell; 236. worm wheel; 237. worm; 238. rotating shaft; 239. valve core; 2310. water hole; 2311. fixing block; 2312. buffer groove; 2313. buffer blade; 2314. water inlet cavity; 2315. water outlet cavity; 2316. driving cavity.
The technical solutions in the examples of the present invention will be clearly and completely described below with reference to the drawings in the examples of the present invention. Obviously, the described examples are only part of the examples of the present invention, but not all of them. Based on the example of the present invention, all other examples obtained by ordinary technicians in the field without making creative efforts are within the protection scope of the present invention.
As shown in FIG. 1, the example of the invention discloses an energy-saving operation adjusting device for efficiently strengthening air preheaters and air heaters, characterized by including an ash removal part 1, an air heater heating part 2, a low-pressure heating part 3 and an air preheater 4; a flue-gas inlet of the ash removal part 1 is connected with a flue-gas outlet at cold ends of the air preheater 4; an outlet of the air heater heating part 2 is connected with an inlet of the air preheater 4; a condensate circulation loop is arranged among the air heater heating part 2, the low-pressure heating part 3 and the ash removal part 1; electric regulating valves 23 are arranged on water outlet ducts of the air heater heating part 2 for regulating working efficiency of the air heater heating part 2.
Among them, a flue-gas inlet of the air preheater 4 is connected with an economizer of the boiler;
Among them, the low-pressure heating part 3 is connected with an exhaust port of a steam turbine unit;
The working principle of the above technical scheme is as follows. Flue gas from the economizer enters the air preheater 4 to heat the air in the air preheater 4, and the flue gas enters the ash removal part 1 through the flue-gas outlet at the cold ends of the air preheater 4, and the 504588 ash removal part 1 removes dust and discharges the flue gas. The steam from the steam turbine unit is sent to the low-pressure heating part 3 to heat the water in the low-pressure heating part 3, and the water heated by the low-pressure heating part 3 is sent to the air heater heating part 2 to heat the air in the air heater heating part 2. The heated air enters the air preheater 4 to be reheated and then burned in the boiler. The electric regulating valves 23 are arranged on the water outlet duct of the air heater heating part 2 to regulate the condensate passing through the air heater heating part 2.
The technical scheme has the following beneficial effects. The electric regulating valves 23 are arranged at the water outlet duct of the air heater heating part 2, so that the problem of flue-gas temperature deviation on both sides of the air preheater 4 is solved. The flue-gas temperature of the air preheater 4 is effectively reduced, and at the same time, the optimized energy-saving operation of the whole system is realized. The resource consumption is reduced and the economic benefit is improved.
In an example, the ash removal part 1 includes a flue-gas cooler 11, a dust collector 12, a desulfurization tower 13, a flue-gas reheater 14, a flue-gas cold water duct 15, a flue-gas hot water duct 16, a heat medium auxiliary heater 17 and a first water pump 18; a flue-gas inlet of the flue-gas cooler 11 is connected with a flue-gas outlet of the air preheater 4; the flue-gas cooler 11, the dust collector 12, the desulfurization tower 13 and the flue-gas reheater 14 are sequentially connected; one end of the flue-gas cold water duct 15 is connected with a water inlet of the flue-gas cooler 11, and the other end is connected with a water outlet of the flue-gas reheater 14; one end of the flue-gas hot water duct 16 is connected with the water outlet of the flue-gas cooler 11, and the other end is connected with the water inlet of the flue-gas reheater 14; the heat medium auxiliary heater 17 is arranged on the flue-gas hot water duct 16; the first water pump 18 is arranged on the flue-gas cold water duct 15.
Among them, the flue-gas reheater 14 is communicated with a chimney 6.
The working principle of the above technical scheme is as follows. The flue-gas from the air preheater 4 passes through the flue-gas cooler 11, the dust collector 12, the desulfurization tower
13 and the flue-gas reheater 14 in turn, and the flue gas 1s cooled, dusted, desulfurized and 504588 reheated and then discharged through the chimney 6. The flue-gas cold water duct 15 and the flue-gas hot water duct 16 form a water circulation between the flue-gas cooler 11 and the flue-gas reheater 14. The first water pump 18 is arranged on the flue-gas cold water duct 15 to provide power for the whole water circulation. The heat medium auxiliary heater 17 is arranged on the flue-gas hot water duct 16 to heat the condensate in the water circulation to ensure the normal operation of the flue-gas reheater 14.
As shown in FIG. 1 and FIG. 2, in an example, the air heater heating part 2 includes a first air heater 21, a second air heater 22, the electric regulating valves 23, a first air heater duct 24, a second air heater duct 25, an air heater water outlet duct 26, a water replenishing duct 27, a first electromagnetic valve 28, a first temperature sensor 29, a first pressure sensor 210, a second temperature sensor 211, a second pressure sensor 212, a third temperature sensor 213 and a fourth temperature sensor 214; a water outlet duct of the low-pressure heating part 3 is connected with water inlets of the first air heater 21 and the second air heater 22; the first air heater duct 24 is connected with a water outlet of the first air heater 21; the second air heater duct 25 is connected with a water outlet of the second air heater 22; the electric regulating valves 23 are respectively arranged on the first air heater duct 24 and the second air heater duct 25; one end of the air heater water outlet duct 26 is connected with the first air heater duct 24 and the second air heater duct 25, and the other end is connected with a water inlet of the low-pressure heating part 3; one end of the water replenishing duct 27 is connected with the air heater water outlet duct 26, and the other end is connected with the flue-gas cold water duct 15; the first temperature sensor 29 and the first pressure sensor 210 are arranged on the first air heater duct 24; the second temperature sensor 211 and the second pressure sensor 212 are arranged on the second air heater duct 25; the first electromagnetic valve 28 is arranged on the water replenishing duct 27,
the third temperature sensor 213 and the fourth temperature sensor 214 are respectively 04988 arranged at air outlets of the first air heater 21 and the second air heater 22.
Among them, the first temperature sensor 29, the first pressure sensor 210, the second temperature sensor 211 and the second pressure sensor 212 are all arranged at the water outlet of the electric regulating valves 23.
The working principle of the technical scheme is as follows. The condensate after low-pressure heating enters the first air heater 21 and the second air heater 22 to heat the air in the first air heater 21 and the second air heater 22. The first temperature sensor 29, the first pressure sensor 210, the second temperature sensor 211 and the second pressure sensor 212 respectively detect the temperatures and pressures in the first air heater duct 24 and the second air heater duct 25. When the water in the water circulation in the ash removal part 1 needs to be replenished, the first electromagnetic valve 28 is opened to replenish the water in the water circulation in the ash removal part 1 through the water replenishing duct 27. The third temperature sensor 213 and the fourth temperature sensor 214 detect the outlet temperatures of the first air heater 21 and the second air heater 22.
The technical scheme has the following beneficial effects. By setting the electric regulating valves 23, when the flue-gas temperature at the cold ends of the air preheater 4 deviates, the electric regulating valves 23 are controlled to control the flow of condensate passing through the first air heater 21 and the second air heater 22, so as to achieve the purpose of regulating the outlet temperatures of the first air heater 21 and the second air heater 22, and to adjust the temperature of the cold ends of the air preheater 4 and prevent low-temperature corrosion.
As shown in FIG. 1 and FIG. 3, in an example, the low-pressure heating part 3 includes a first low-pressure heater 31, a second low-pressure heater 32, a first low-pressure duct 33, a second low-pressure duct 34, a condensate heater 35, a first condensate duct 36, a second condensate duct 37, a third condensate duct 38, a permanent magnet pump 39, a permanent magnet pump water inlet duct 310, a permanent magnet pump water outlet duct 311, a drainage duct 312, a fifth temperature sensor 313, a third pressure sensor 314, a sixth temperature sensor 315, a fourth pressure sensor 316, a second water pump 317, a second electromagnetic valve 318, a third electromagnetic valve 319, a fourth electromagnetic valve 320, a fifth electromagnetic valve 321, a sixth electromagnetic valve 322 and a seventh electromagnetic valve 323;
a water inlet of the first low-pressure heater 31 is connected with the air heater water outlet 504588 duct 26; one end of the first low-pressure duct 33 is connected with a water outlet of the first low-pressure heater 31, and the other end is connected with a water inlet of the second low-pressure heater 32; one end of the second low-pressure duct 34 is connected with a water outlet of the second low-pressure heater 32, and the other end is connected with the permanent magnet pump water inlet duct 310; the permanent magnet pump water inlet duct 310, the permanent magnet pump 39 and the permanent magnet pump water outlet duct 311 are sequentially connected, wherein the permanent magnet pump water outlet duct 311 is respectively connected with the water inlets of the first air heater 21 and the second air heater 22; one end of the first condensate duct 36 is connected with the air heater water outlet duct 26, and the other end is connected with a water inlet of the condensate heater 35; one end of the second condensate duct 37 is connected with a water outlet of the condensate heater 35, and the other end is connected with the first low-pressure duct 33; one end of the third condensate duct 38 is connected with the second condensate duct 37, and the other end is connected with the second low-pressure duct 34; one end of the drainage duct 312 is connected with the flue-gas hot water duct 16, and the other end is connected with the permanent magnet pump water inlet duct 310; the second water pump 317 and the second electromagnetic valve 318 are arranged on the first condensate duct 36; the third electromagnetic valve 319 is arranged on the second condensate duct 37; the fourth electromagnetic valve 320 is arranged on the third condensate duct 38; the fifth electromagnetic valve 321 is arranged on the permanent magnet pump water inlet duct 310; the sixth electromagnetic valve 322 is arranged on the permanent magnet pump water outlet duct 311; the seventh electromagnetic valve 323 is arranged on the drainage duct 312;
the fifth temperature sensor 313 and the third pressure sensor 314 are arranged on the 504588 second low-pressure duct 34; the sixth temperature sensor 315 and the fourth pressure sensor 316 are arranged on the permanent magnet pump water outlet duct 311.
Among them, the first low-pressure heater 31 and the second low-pressure heater 32 are connected to the exhaust port of the steam turbine unit through an exhaust chimney 6.
The working principle of the above technical scheme is as follows. The condensate from the air heater water outlet duct 26 passes through the first low-pressure heater 31, the first low-pressure duct 33, the second low-pressure heater 32 and the second low-pressure duct 34 in turn to heat the condensate. The second low-pressure heater 32 is provided with the fifth temperature sensor 313 and the third pressure sensor 314 to detect the pressure and temperature of the condensate in the second low-pressure heater 32. When the temperature of the condensate is found to be low, the second electromagnetic valve 318, the third electromagnetic valve 319 and the fourth electromagnetic valve 320 are turned on, and the condensate heater 35 and the second water pump 317 are turned on for auxiliary heating of the condensate. The heated condensate is conveyed to the first air heater 21 and the second air heater 22 through the permanent magnet pump 39. The sixth temperature sensor 315 and the fourth pressure sensor 316 are arranged on the permanent magnet pump water outlet duct 311 to detect the temperature and pressure of the condensate before it enters the first air heater 21 and the second air heater 22.
As shown in FIG. 4-FIG. 6, in an example, the electric regulating valves 23 include a valve body 231, an upper valve cover 232, a lower valve cover 233, a driving motor 234, a motor shell 235, a worm wheel 236, a worm 237, a rotating shaft 238, a valve core 239, water holes 2310, a fixing block 2311, buffer grooves 2312 and a buffer blade 2313; the valve body 231 includes a water inlet cavity 2314, a water outlet cavity 2315 and a driving cavity 2316, and the water inlet cavity 2314 and the water outlet cavity 2315 are communicated through water holes 2310; the upper valve cover 232 is arranged above the driving cavity 2316 and is fixedly connected with the valve body 231;
the driving motor 234 is fixedly connected to a top of the upper valve cover 232, and the 504588 driving motor 234 is externally equipped with the motor shell 235 that is fixedly connected to the upper valve cover 232; one end of the worm wheel 236 is connected with the driving motor 234, and the other end is meshed with the worm 237; the worm 237 penetrates the upper valve cover 232 and is fixedly connected with the rotating shaft 238; the rotating shaft 238 penetrates above the water inlet cavity 2314, and a lower end of the rotating shaft 238 is fixedly connected with the valve core 239; the valve core 239 is arranged in the water inlet cavity 2314 and rotatably connected with the valve body 231; the lower valve cover 233 is arranged below the water outlet cavity 2315 and is fixedly connected with the valve body 231; the fixing block 2311 is arranged right below the water holes 2310, one end of the fixing block 2311 is fixedly connected with the lower valve cover 233, and the other end is rotatably connected with bottoms of the buffer grooves 2312; the buffer blade 2313 is fixedly connected to inner walls of side surfaces of the buffer grooves 2312.
The working principle of the above technical scheme is as follows. The driving motor 234 is remotely controlled, the valve core 239 is rotated by the transmission of the worm wheel 236, the worm 237 and the rotating shaft 238, and the water flow rate is controlled by controlling the water passing area of the water holes 2310. The condensate enters the buffer grooves 2312 after passing through the water holes 2310, and the buffer grooves 2310 rotate under the action of the buffer blade 2313 to buffer the high-pressure condensate;
In an example, the air inlet of the air preheater 4 is provided with a seventh temperature sensor 41.
In an example, the permanent magnet pump 39 is connected in parallel with a standby permanent magnet pump 324, and a water inlet duct and a water outlet duct of the standby permanent magnet pump 324 are respectively provided with an eighth electromagnetic valve 325 and a ninth electromagnetic valve 326.
The above example has the following beneficial effects. By setting the standby permanent 504588 magnet pump 324, when the pressure of one permanent magnet pump 39 is insufficient, the standby permanent magnet pump 324 is turned on to ensure the normal operation of the system, and the stability of the system operation is improved.
To sum up, the working process of the invention to achieve the purpose of adjusting the cold end temperature of the air preheater 4 is as follows. The seventh temperature sensor 41 detects the difference in the cold end temperatures of the air preheater 4 on both sides, adjusts the output efficiency of the permanent magnet pump 39 according to a lower temperature side, and controls the flow rate through the electric regulating valves 23 according to the water outlet temperatures and air outlet temperatures of the first air heater 21 and the second air heater 22.In that case, the temperature of the cold end of the air preheater 4 on the lower temperature side is increased after the permanent magnet pump 39 improves the output efficiency, thereby reducing the power consumption of the permanent magnet pump 39, saving resources and improving economic benefits.
The invention carries out data analysis in practical application. 1. Energy consumption analysis of the reformed permanent magnet booster pump.
The invention estimates the energy consumption change of the permanent magnet booster pump by a proportional method. In the practical application process of the air heater system, the permanent magnet booster pump of the air heater corresponding to SOOMW is already in high-power operation condition. So based on the operation parameters of 500MW, the proportional rough estimation and analysis of the permanent magnet booster pump under different loads are carried out respectively, and the following table is obtained.
preheater | qq) U0
Ideal temperature drop of air 2262 176.6 preheater
Condensate flow of heater (C)| 90 | 116 | 133
Percentage reduction of energy consumption of permanent 3.09% 1.55% 0.85% magnet booster pump (%)
Annual electricity saving degree of permanent magnet 8040 4080 2160 booster pump (kilowatt hour)
Each example in this specification is described in a progressive way, and each example focuses on the differences from other examples, so it is only necessary to refer to the same and similar parts between each example. As for the devices disclosed in the examples, because they correspond to the method disclosed in the examples, the description is relatively simple, and the relevant points may only be described in the method part.
The above description of the disclosed examples enables those skilled in the art to make or use the invention. Many modifications to these examples will be obvious to those skilled in the art, and the general principles defined herein may be implemented in other examples without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the examples shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. An energy-saving operation adjusting device for efficiently strengthening air preheaters and air heaters, characterized by comprising an ash removal part (1), an air heater heating part (2), a low-pressure heating part (3) and an air preheater (4); a flue-gas inlet of the ash removal part (1) is connected with a flue-gas outlet at cold ends of the air preheater (4); an outlet of the air heater heating part (2) is connected with an inlet of the air preheater (4); a condensate circulation loop is arranged among the air heater heating part (2), the low-pressure heating part (3) and the ash removal part (1); electric regulating valves (23) are arranged on water outlet ducts of the air heater heating part (2) for regulating working efficiency of the air heater heating part (2).
2. The energy-saving operation adjusting device for efficiently strengthening air preheaters and air heaters according to claim 1, characterized in that, the ash removal part (1) comprises a flue-gas cooler (11), a dust collector (12), a desulfurization tower (13), a flue-gas reheater (14), a flue-gas cold water duct (15), a flue-gas hot water duct (16), a heat medium auxiliary heater (17) and a first water pump (18); a flue-gas inlet of the flue-gas cooler (11) is connected with a flue-gas outlet of the air preheater (4); the flue-gas cooler (11), the dust collector (12), the desulfurization tower (13) and the flue-gas reheater (14) are sequentially connected; one end of the flue-gas cold water duct (15) is connected with a water inlet of the flue-gas cooler (11), and the other end is connected with a water outlet of the flue-gas reheater (14); one end of the flue-gas hot water duct (16) is connected with the water outlet of the flue-gas cooler (11), and the other end is connected with the water inlet of the flue-gas reheater (14); the heat medium auxiliary heater (17) 1s arranged on the flue-gas hot water duct (16); the first water pump (18) 1s arranged on the flue-gas cold water duct (15).
3. The energy-saving operation adjusting device for efficiently strengthening air preheaters and air heaters according to claim 2, characterized in that, the air heater heating part (2) comprises a first air heater (21), a second air heater (22), the electric regulating valves (23), a first air heater duct (24), a second air heater duct (25), an air heater water outlet duct (26), a water replenishing duct (27), a first electromagnetic valve (28), a first temperature sensor 29), à 504588 first pressure sensor (210), a second temperature sensor (211), a second pressure sensor (212), a third temperature sensor (213) and a fourth temperature sensor (214); a water outlet duct of the low-pressure heating part (3) is connected with water inlets of the first air heater (21) and the second air heater (22); the first air heater duct (24) is connected with a water outlet of the first air heater (21); the second air heater duct (25) is connected with a water outlet of the second air heater (22); the electric regulating valves (23) are respectively arranged on the first air heater duct (24) and the second air heater duct (25); one end of the air heater water outlet duct (26) is connected with the first air heater duct (24) and the second air heater duct (25), and the other end is connected with a water inlet of the low-pressure heating part (3); one end of the water replenishing duct (27) is connected with the air heater water outlet duct (26), and the other end is connected with the flue-gas cold water duct (15); the first temperature sensor (29) and the first pressure sensor (210) are arranged on the first air heater duct (24); the second temperature sensor (211) and the second pressure sensor (212) are arranged on the second air heater duct (25); the first electromagnetic valve (28) is arranged on the water replenishing duct (27); the third temperature sensor (213) and the fourth temperature sensor (214) are respectively arranged at air outlets of the first air heater (21) and the second air heater (22).
4. The energy-saving operation adjusting device for efficiently strengthening air preheaters and air heaters according to claim 3, characterized in that, the low-pressure heating part (3) comprises a first low-pressure heater (31), a second low-pressure heater (32), a first low-pressure duct (33), a second low-pressure duct (34), a condensate heater (35), a first condensate duct (36), a second condensate duct (37), a third condensate duct (38), a permanent magnet pump (39), a permanent magnet pump water inlet duct (310), a permanent magnet pump water outlet duct (311), a drainage duct (312), a fifth temperature sensor (313), a third pressure sensor (314), a sixth temperature sensor (315), a fourth pressure sensor (316), a second water pump (317), a second electromagnetic valve (318), a third electromagnetic valve (319), a fourth electromagnetic valve (320), a fifth electromagnetic valve (321), a sixth electromagnetic valve 504588 (322) and a seventh electromagnetic valve (323); a water inlet of the first low-pressure heater (31) is connected with the air heater water outlet duct (26);
one end of the first low-pressure duct (33) is connected with a water outlet of the first low-pressure heater (31), and the other end is connected with a water inlet of the second low-pressure heater (32);
one end of the second low-pressure duct (34) is connected with a water outlet of the second low-pressure heater (32), and the other end is connected with the permanent magnet pump water inlet duct (310); the permanent magnet pump water inlet duct (310), the permanent magnet pump (39) and the permanent magnet pump water outlet duct (311) are sequentially connected, wherein the permanent magnet pump water outlet duct (311) is respectively connected with the water inlets of the first air heater (21) and the second air heater (22); one end of the first condensate duct (36) is connected with the air heater water outlet duct (26), and the other end is connected with a water inlet of the condensate heater (35); one end of the second condensate duct (37) is connected with a water outlet of the condensate heater (35), and the other end is connected with the first low-pressure duct (33); one end of the third condensate duct (38) is connected with the second condensate duct (37), and the other end is connected with the second low-pressure duct (34); one end of the drainage duct (312) is connected with the flue-gas hot water duct (16), and the other end is connected with the permanent magnet pump water inlet duct (310); the second water pump (317) and the second electromagnetic valve (318) are arranged on the first condensate duct (36); the third electromagnetic valve (319) is arranged on the second condensate duct (37); the fourth electromagnetic valve (320) is arranged on the third condensate duct (38); the fifth electromagnetic valve (321) is arranged on the permanent magnet pump water inlet duct (310); the sixth electromagnetic valve (322) is arranged on the permanent magnet pump water outlet duct (311);
the seventh electromagnetic valve (323) is arranged on the drainage duct (312); 0506588 the fifth temperature sensor (313) and the third pressure sensor (314) are arranged on the second low-pressure duct (34); the sixth temperature sensor (315) and the fourth pressure sensor (316) are arranged on the permanent magnet pump water outlet duct (311).
5. The energy-saving operation adjusting device for efficiently strengthening air preheaters and air heaters according to claim 3, characterized in that, the electric regulating valves (23) comprise a valve body (231), an upper valve cover (232), a lower valve cover (233), a driving motor (234), a motor shell (235), a worm wheel (236), a worm (237), a rotating shaft (238), a valve core (239), water holes (2310), a fixing block (2311), buffer grooves (2312) and a buffer blade (2313); the valve body (231) comprises a water inlet cavity (2314), a water outlet cavity (2315) and a driving cavity (2316), and the water inlet cavity (2314) and the water outlet cavity (2315) are communicated through water holes (2310); the upper valve cover (232) is arranged above the driving cavity (2316) and is fixedly connected with the valve body (231); the driving motor (234) is fixedly connected to a top of the upper valve cover (232), and the driving motor (234) is externally equipped with the motor shell (235) that is fixedly connected to the upper valve cover (232); one end of the worm wheel (236) is connected with the driving motor (234), and the other end is meshed with the worm (237); the worm (237) penetrates the upper valve cover (232) and is fixedly connected with the rotating shaft (238); the rotating shaft (238) penetrates above the water inlet cavity (2314), and a lower end of the rotating shaft (238) is fixedly connected with the valve core (239); the valve core (239) is arranged in the water inlet cavity (2314) and rotatably connected with the valve body (231); the lower valve cover (233) is arranged below the water outlet cavity (2315) and is fixedly connected with the valve body (231);
the fixing block (2311) is arranged right below the water holes (2310), one end of the fixing 504588 block (2311) is fixedly connected with the lower valve cover (233), and the other end is rotatably connected with bottoms of the buffer grooves (2312); the buffer blade (2313) is fixedly connected to inner walls of side surfaces of the buffer grooves (2312).
6. The energy-saving operation adjusting device for efficiently strengthening air preheaters and air heaters according to claim 1, characterized in that, the air inlet of the air preheater (4) is provided with a seventh temperature sensor (41).
7. The energy-saving operation adjusting device for efficiently strengthening air preheaters and air heaters according to claim 4, characterized in that, the permanent magnet pump (39) is connected in parallel with a standby permanent magnet pump (324), and a water inlet duct and a water outlet duct of the standby permanent magnet pump (324) are respectively provided with an eighth electromagnetic valve (325) and a ninth electromagnetic valve (326).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211406963.2A CN115854776A (en) | 2022-11-10 | 2022-11-10 | Energy-saving operation adjusting device of air heater of efficient reinforced air preheater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU504588B1 true LU504588B1 (en) | 2024-01-09 |
Family
ID=85663023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU504588A LU504588B1 (en) | 2022-11-10 | 2023-06-27 | Energy-saving operation adjusting device for efficiently strengthening air preheaters and air heaters |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN115854776A (en) |
| LU (1) | LU504588B1 (en) |
-
2022
- 2022-11-10 CN CN202211406963.2A patent/CN115854776A/en active Pending
-
2023
- 2023-06-27 LU LU504588A patent/LU504588B1/en active
Also Published As
| Publication number | Publication date |
|---|---|
| CN115854776A (en) | 2023-03-28 |
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