A high-efficiency enhanced air preheater heater energy-saving operation adjustment device

Abstract

This invention discloses a high-efficiency, energy-saving operation adjustment device for an air preheater heater, comprising: a dust removal section, a heater heating section, a low-pressure heating section, and an air preheater; the flue gas inlet of the dust removal section is connected to the cold end flue gas outlet of the air preheater; the air outlet of the heater heating section is connected to the air inlet of the air preheater; a condensate circulation loop is provided between the heater heating section, the low-pressure heating section, and the dust removal section; an electric regulating valve is installed on the water outlet pipe of the heater heating section to adjust the working efficiency of the heater heating section; by installing an electric regulating valve at the water outlet pipe of the heater heating section, the problem of flue gas temperature deviation on both sides of the air preheater is solved, effectively reducing the flue gas temperature of the air preheater, while realizing the overall optimized energy-saving operation of the system, reducing resource consumption, and improving economic benefits.

Description

Technical Field

[0001] This invention relates to the field of energy-saving technology for air preheaters and air heaters, and more specifically to a highly efficient device for adjusting the energy-saving operation of air preheaters and air heaters. Background Technology

[0002] After the generalized air heater system is put into operation, the condensate heat source passes through the air preheaters on both sides without automatic adjustment, making it impossible to accurately control the overall temperature of the cold ends of the air preheaters on both sides. In the actual operation of the 1000 MW unit boiler, due to inconsistencies in combustion adjustment, air preheater heat exchange, air preheater leakage rate, and ash accumulation in the tail shaft flue, the exhaust gas temperature of the air preheaters on both sides will inevitably deviate. Under this operating mode, in order to prevent low-temperature corrosion of the cold ends of the air preheaters, the permanent magnet booster pump of the air heater must be controlled based on the air preheater with the lower exhaust gas temperature. The exhaust gas temperature on the other side will inevitably increase at the same time, resulting in an increase in the power consumption of the permanent magnet booster pump.

[0003] How to conserve resources while ensuring that low-temperature corrosion does not occur at the cold end of the air preheater is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the present invention provides a highly efficient energy-saving operation adjustment device for air preheater heaters, which saves resources while ensuring that low-temperature corrosion does not occur at the cold end of the air preheater.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] Preferably, the above-mentioned high-efficiency enhanced air preheater heater energy-saving operation adjustment device includes: a dust removal section, a heater heating section, a low-pressure heating section, and an air preheater;

[0007] The dust removal unit's flue gas inlet is connected to the cold end flue gas outlet of the air preheater;

[0008] The air outlet of the heater unit is connected to the air inlet of the air preheater.

[0009] A condensate circulation loop is provided between the heating section of the heater, the low-pressure heating section and the dust removal section;

[0010] An electric regulating valve is installed on the water outlet pipe of the heater unit to adjust the working efficiency of the heater unit.

[0011] Preferably, the dust removal unit includes: a flue gas cooler, a dust collector, a desulfurization tower, a flue gas reheater, a flue gas cold water pipeline, a flue gas hot water pipeline, a heat medium auxiliary heater, and a first water pump;

[0012] The flue gas cooler's inlet is connected to the air preheater's outlet.

[0013] The flue gas cooler, the dust collector, the desulfurization tower, and the flue gas reheater are connected in sequence;

[0014] The flue gas cooling water pipe is connected at one end to the inlet of the flue gas cooler and at the other end to the outlet of the flue gas reheater.

[0015] The flue gas hot water pipe is connected at one end to the outlet of the flue gas cooler and at the other end to the inlet of the flue gas reheater.

[0016] The heat medium auxiliary heater is installed on the flue gas hot water pipe;

[0017] The first water pump is installed on the flue gas cooling water pipeline.

[0018] Preferably, the heating element of the heater includes: a first heater, a second heater, the electric regulating valve, a first heating pipe, a second heating pipe, a heating water outlet pipe, a water supply pipe, a first solenoid 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.

[0019] The water outlet pipe of the low-pressure heating unit is connected to the water inlet of the first air heater and the second air heater;

[0020] The first heating pipe is connected to the water outlet of the first heater;

[0021] The second heating pipe is connected to the outlet of the second heating unit;

[0022] The electric regulating valves are respectively installed on the first heating air duct and the second heating air duct;

[0023] The warm air outlet pipe is connected at one end to the first warm air pipe and the second warm air pipe, and at the other end to the water inlet of the low-pressure heating unit.

[0024] The water supply pipe is connected at one end to the warm air outlet pipe and at the other end to the flue gas cold water pipe.

[0025] The first temperature sensor and the first pressure sensor are mounted on the first heating duct.

[0026] The second temperature sensor and the second pressure sensor are installed on the second heating duct;

[0027] The first solenoid valve is installed on the water supply pipe.

[0028] The third temperature sensor and the fourth temperature sensor are respectively installed at the air outlets of the first heater and the second heater.

[0029] Preferably, the low-pressure heating unit includes: a first low-pressure heater, a second low-pressure heater, a first low-pressure pipe, a second low-pressure pipe, a condensate heater, a first condensate pipe, a second condensate pipe, a third condensate pipe, a permanent magnet pump, a permanent magnet pump inlet pipe, a permanent magnet pump outlet pipe, a drain pipe, a fifth temperature sensor, a third pressure sensor, a sixth temperature sensor, a fourth pressure sensor, a second water pump, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a fifth solenoid valve, a sixth solenoid valve, and a seventh solenoid valve;

[0030] The inlet of the first low-pressure heater is connected to the hot air outlet pipe;

[0031] The first low-pressure pipe is connected at one end to the outlet of the first low-pressure heater and at the other end to the inlet of the second low-pressure heater.

[0032] The second low-pressure pipe is connected at one end to the outlet of the second low-pressure heater and at the other end to the inlet pipe of the permanent magnet pump.

[0033] The permanent magnet pump inlet pipe, the permanent magnet pump, and the permanent magnet pump outlet pipe are connected in sequence, wherein the permanent magnet pump outlet pipe is connected to the inlet of the first heater and the second heater respectively.

[0034] The first condensate pipe is connected at one end to the warm air outlet pipe and at the other end to the inlet of the condensate heater.

[0035] The second condensate pipe is connected at one end to the outlet of the condensate heater and at the other end to the first low-pressure pipe.

[0036] The third condensate pipe is connected at one end to the second condensate pipe and at the other end to the second low-pressure pipe.

[0037] The drainage pipe is connected at one end to the flue gas hot water pipe and at the other end to the permanent magnet pump inlet pipe.

[0038] The second water pump and the second solenoid valve are installed on the first condensate pipe;

[0039] The third solenoid valve is installed on the second condensate pipe;

[0040] The fourth solenoid valve is installed on the third condensate pipe;

[0041] The fifth solenoid valve is installed on the water inlet pipe of the permanent magnet pump;

[0042] The sixth solenoid valve is installed on the water outlet pipe of the permanent magnet pump;

[0043] The seventh solenoid valve is installed on the drainage pipe;

[0044] The fifth temperature sensor and the third pressure sensor are installed on the second low-pressure pipeline;

[0045] The sixth temperature sensor and the fourth pressure sensor are installed on the outlet pipe of the permanent magnet pump.

[0046] Preferably, the electric regulating valve includes: a valve body, an upper valve cover, a lower valve cover, a drive motor, a motor housing, a worm gear, a worm, a rotating shaft, a valve core, a water passage hole, a fixing block, a buffer groove, and a buffer blade;

[0047] The valve body has an inlet chamber, an outlet chamber, and a drive chamber, and the inlet chamber and the outlet chamber are connected through the water passage hole;

[0048] The upper valve cover is disposed above the drive cavity and is fixedly connected to the valve body;

[0049] The drive motor is fixedly connected to the top of the upper valve cover, and a motor housing is provided on its exterior and fixedly connected to the upper valve cover;

[0050] One end of the worm gear is connected to the drive motor, and the other end is engaged with the worm.

[0051] The worm gear passes through the upper valve cover and is fixedly connected to the rotating shaft;

[0052] The rotating shaft passes through the top of the water inlet chamber, and its lower end is fixedly connected to the valve core.

[0053] The valve core is disposed in the water inlet chamber and is rotatably connected to the valve body;

[0054] The lower valve cover is located below the water outlet chamber and is fixedly connected to the valve body;

[0055] The fixing block is located directly below the water passage hole, with one end fixedly connected to the lower valve cover and the other end rotatably connected to the bottom of the buffer tank.

[0056] The buffer blade is fixedly connected to the inner wall of the side of the buffer groove.

[0057] Preferably, the air preheater is equipped with a seventh temperature sensor at its air inlet.

[0058] Preferably, the permanent magnet pump is provided with a backup permanent magnet pump in parallel, and the inlet pipe and outlet pipe of the backup permanent magnet pump are respectively equipped with an eighth solenoid valve and a ninth solenoid valve.

[0059] As can be seen from the above technical solution, compared with the prior art, the beneficial effects of the present invention are as follows:

[0060] 1. By installing an electric regulating valve at the outlet of the air heater, the problem of temperature deviation in the flue gas on both sides of the air preheater was solved, effectively reducing the flue gas temperature of the air preheater. At the same time, the overall system achieved optimized energy-saving operation, reduced resource consumption, and improved economic efficiency. Attached Figure Description

[0061] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0062] Figure 1 The attached figure is a schematic diagram of the overall structure of the present invention.

[0063] Figure 2 The attached figure is a schematic diagram of the A mark structure of the present invention.

[0064] Figure 3 The attached figure is a schematic diagram of the B-marker structure of the present invention.

[0065] Figure 4 The attached figure is a schematic diagram of the structure of the electric regulating valve of the present invention.

[0066] Figure 5 The attached figure is a schematic diagram of the C-mark structure of the present invention.

[0067] Figure 6 The attached figure is a schematic diagram of the buffer section of the electric regulating valve in this invention.

[0068] In the diagram, 1. Dust removal unit; 11. Flue gas cooler; 12. Dust collector; 13. Desulfurization tower; 14. Flue gas reheater; 15. Flue gas cold water pipe; 16. Flue gas hot water pipe; 17. Heat medium auxiliary heater; 18. First water pump; 2. Heater section; 21. First heater; 22. Second heater; 23. The electric regulating valve; 24. First heater pipe; 25. Second heater pipe; 26. Heater outlet pipe; 27. Water supply pipe; 28. The... 1. Solenoid valve; 29. ​​First temperature sensor; 210. First pressure sensor; 211. Second temperature sensor; 212. Second pressure sensor; 3. Low-pressure heating unit; 31. First low-pressure heater; 32. Second low-pressure heater; 33. First low-pressure pipeline; 34. Second low-pressure pipeline; 35. Condensate heater; 36. First condensate pipeline; 37. Second condensate pipeline; 38. Third condensate pipeline; 39. Permanent magnet pump; 310. Permanent magnet pump inlet Water pipe; 311. Permanent magnet pump outlet pipe; 312. Drainage pipe; 313. Fifth temperature sensor; 314. Third pressure sensor; 315. Sixth temperature sensor; 316. Fourth pressure sensor; 317. Second water pump; 318. Second solenoid valve; 319. Third solenoid valve; 320. Fourth solenoid valve; 321. Fifth solenoid valve; 322. Sixth solenoid valve; 323. Seventh solenoid valve; 324. Backup permanent magnet pump; 325. Eighth solenoid valve ; 326, Ninth Solenoid Valve; 4, Air Preheater; 41, Seventh Temperature Sensor; 231, Valve Body; 232, Upper Valve Cover; 233, Lower Valve Cover; 234, Drive Motor; 235, Motor Housing; 236, Worm Gear; 237, Worm; 238, Rotating Shaft; 239, Valve Core; 2310, Water Inlet; 2311, Fixing Block; 2312, Buffer Groove; 2313, Buffer Blade; 2314, Inlet Chamber; 2315, Outlet Chamber; 2316, Drive Chamber. Detailed Implementation

[0069] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0070] like Figure 1 As shown in the figure, an embodiment of the present invention discloses a high-efficiency enhanced air preheater heater energy-saving operation adjustment device, characterized in that it includes: a dust removal unit 1, a heater heating unit 2, a low-pressure heating unit 3, and an air preheater 4;

[0071] The inlet of the dust removal unit 1 is connected to the cold end outlet of the air preheater 4;

[0072] The air outlet of the heater 2 is connected to the air inlet of the air preheater 4;

[0073] A condensate circulation loop is provided between the heating section 2 of the air heater, the low-pressure heating section 3 and the dust removal section 1;

[0074] An electric regulating valve 23 is installed on the water outlet pipe of the heater heating section 2 to regulate the working efficiency of the heater heating section 2.

[0075] The air preheater 4 is connected to the economizer of the boiler.

[0076] The low-pressure heating section 3 is connected to the exhaust port of the steam turbine unit;

[0077] The working principle of the above technical solution is as follows: the 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 dust removal section 1 through the cold end outlet of the air preheater 4. The dust removal section 1 removes dust from the flue gas before it is discharged; the steam from the turbine unit is transported to the low-pressure heating section 3 to heat the water in the low-pressure heating section 3, and the water heated by the low-pressure heating section 3 is transported to the air heater heating section 2 to heat the air in the air heater heating section 2. The heated air enters the air preheater 4 for further heating and then enters the boiler for combustion; an electric regulating valve 23 is installed on the water outlet pipe of the air heater heating section 2 to regulate the condensate passing through the air heater heating section 2;

[0078] The beneficial effects of the above technical solution are as follows: by installing an electric regulating valve 23 at the water outlet pipe of the heating section 2 of the air preheater, the problem of temperature deviation between the two sides of the air preheater 4 is solved, the air preheater 4 exhaust temperature is effectively reduced, and the overall system achieves optimized energy-saving operation, reduces resource consumption, and improves economic efficiency.

[0079] In one embodiment, the dust removal unit 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 pipe 15, a flue gas hot water pipe 16, a heat medium auxiliary heater 17, and a first water pump 18.

[0080] The flue gas cooler 11 is connected to the air preheater 4.

[0081] The flue gas cooler 11, dust collector 12, desulfurization tower 13 and flue gas reheater 14 are connected in sequence;

[0082] The flue gas cooling water pipe 15 is connected at one end to the water inlet of the flue gas cooler 11 and at the other end to the water outlet of the flue gas reheater 14.

[0083] The flue gas hot water pipe 16 is connected at one end to the outlet of the flue gas cooler 11 and at the other end to the inlet of the flue gas reheater 14.

[0084] The heat transfer medium auxiliary heater 17 is installed on the flue gas hot water pipe 16;

[0085] The first water pump 18 is installed on the flue gas cooling water pipe 15.

[0086] Among them, the flue gas reheater 14 is connected to the chimney 6;

[0087] The working principle of the above technical solution is as follows: the flue gas from the air preheater 4 passes through the flue gas cooler 11, dust collector 12, desulfurization tower 13 and flue gas reheater 14 in sequence, and is cooled, dusted, desulfurized and reheated before being discharged through the chimney 6; the flue gas cold water pipe 15 and the flue gas hot water pipe 16 form a water circulation between the flue gas cooler 11 and the flue gas reheater 14; the first water pump 18 is installed on the flue gas cold water pipe 15 to provide power for the entire water circulation; the heat medium auxiliary heater 17 is installed on the flue gas hot water pipe 16 to heat the condensate in the water circulation to ensure the normal operation of the flue gas reheater 14.

[0088] like Figure 1 and Figure 2 As shown, in one embodiment, the heater unit 2 includes: a first heater 21, a second heater 22, an electric regulating valve 23, a first heating pipe 24, a second heating pipe 25, a heating water outlet pipe 26, a water supply pipe 27, a first solenoid 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;

[0089] The water outlet pipe of the low-pressure heating unit 3 is connected to the water inlet of the first air heater 21 and the second air heater 22.

[0090] The first heating pipe 24 is connected to the outlet of the first heater 21;

[0091] The second heating pipe 25 is connected to the outlet of the second heater 22;

[0092] Electric regulating valves 23 are respectively installed on the first heating air duct 24 and the second heating air duct 25;

[0093] The warm air outlet pipe 26 is connected at one end to the first warm air pipe 24 and the second warm air pipe 25, and at the other end to the water inlet of the low-pressure heating unit 3.

[0094] Water supply pipe 27 is connected at one end to warm air outlet pipe 26 and at the other end to flue gas cold water pipe 15;

[0095] The first temperature sensor 29 and the first pressure sensor 210 are disposed on the first heating air duct 24;

[0096] The second temperature sensor 211 and the second pressure sensor 212 are disposed on the second heating air duct 25;

[0097] The first solenoid valve 28 is installed on the water supply pipe 27;

[0098] The third temperature sensor 213 and the fourth temperature sensor 214 are respectively located at the air outlets of the first heater 21 and the second heater 22.

[0099] The first temperature sensor 29, the first pressure sensor 210, the second temperature sensor 211, and the second pressure sensor 212 are all located at the outlet of the electric regulating valve 23.

[0100] The working principle of the above technical solution 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 temperature and pressure in the first air duct 24 and the second air duct 25; when the water circulation in the dust removal section 1 needs to be replenished, the first solenoid valve 28 is opened to replenish the water circulation in the dust removal section 1 through the water replenishment pipe 27; the third temperature sensor 213 and the fourth temperature sensor 214 detect the outlet air temperature of the first air heater 21 and the second air heater 22.

[0101] The beneficial effects of the above technical solution are as follows: by setting the electric regulating valve 23, when the exhaust temperature at the cold end of the air preheater 4 deviates, the electric regulating valve 23 is controlled to control the flow rate of condensate in the first air heater 21 and the second air heater 22, thereby achieving the purpose of regulating the outlet temperature of the first air heater 21 and the second air heater 22, regulating the temperature at the cold end of the air preheater 4, and preventing the occurrence of low-temperature corrosion.

[0102] Figure 1 and Figure 3 As shown, in one embodiment, the low-pressure heating unit 3 includes: a first low-pressure heater 31, a second low-pressure heater 32, a first low-pressure pipe 33, a second low-pressure pipe 34, a condensate heater 35, a first condensate pipe 36, a second condensate pipe 37, a third condensate pipe 38, a permanent magnet pump 39, a permanent magnet pump inlet pipe 310, a permanent magnet pump outlet pipe 311, a drain pipe 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 solenoid valve 318, a third solenoid valve 319, a fourth solenoid valve 320, a fifth solenoid valve 321, a sixth solenoid valve 322, and a seventh solenoid valve 323.

[0103] The inlet of the first low-pressure heater 31 is connected to the hot air outlet pipe 26;

[0104] The first low-pressure pipe 33 is connected at one end to the outlet of the first low-pressure heater 31 and at the other end to the inlet of the second low-pressure heater 32.

[0105] The second low-pressure pipe 34 is connected at one end to the outlet of the second low-pressure heater 32 and at the other end to the inlet pipe 310 of the permanent magnet pump.

[0106] The permanent magnet pump inlet pipe 310, the permanent magnet pump 39 and the permanent magnet pump outlet pipe 311 are connected in sequence, wherein the outlet pipe of the permanent magnet pump 39 is connected to the inlet of the first heater 21 and the second heater 22 respectively.

[0107] The first condensate pipe 36 is connected at one end to the warm air outlet pipe 26 and at the other end to the inlet of the condensate heater 35.

[0108] The second condensate pipe 37 is connected at one end to the outlet of the condensate heater 35 and at the other end to the first low-pressure pipe 33.

[0109] The third condensate pipe 38 is connected at one end to the second condensate pipe 37 and at the other end to the second low-pressure pipe 34.

[0110] Drainage pipe 312 is connected at one end to flue gas hot water pipe 16 and at the other end to permanent magnet pump inlet pipe 310;

[0111] The second water pump 317 and the second solenoid valve 318 are installed on the first condensate pipe 36;

[0112] The third solenoid valve 319 is installed on the second condensate pipe 37;

[0113] The fourth solenoid valve 320 is installed on the third condensate pipe 38;

[0114] The fifth solenoid valve 321 is installed on the inlet pipe 310 of the permanent magnet pump;

[0115] The sixth solenoid valve 322 is installed on the outlet pipe 311 of the permanent magnet pump;

[0116] The seventh solenoid valve 323 is installed on the drain pipe 312;

[0117] The fifth temperature sensor 313 and the third pressure sensor 314 are mounted on the second low-pressure pipe 34;

[0118] The sixth temperature sensor 315 and the fourth pressure sensor 316 are installed on the water outlet pipe 311 of the permanent magnet pump.

[0119] 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 the exhaust pipe 6.

[0120] The working principle of the above technical solution is as follows: Condensate from the outlet pipe 26 of the heater passes through the first low-pressure heater 31, the first low-pressure pipe 33, the second low-pressure heater 32, and the second low-pressure pipe 34 in sequence to heat the condensate; a fifth temperature sensor 313 and a third pressure sensor 314 are installed on the second low-pressure heater 32 to detect the pressure and temperature of the condensate in the second low-pressure heater 32. When the condensate temperature is found to be low, the second solenoid valve 318, the third solenoid valve 319, and the fourth solenoid valve 320 are opened to start the condensate heater 35 and the second water pump 317 to provide auxiliary heating for the condensate; the heated condensate is transported to the first heater 21 and the second heater 22 through the permanent magnet pump 39. A sixth temperature sensor 315 and a fourth pressure sensor 316 are installed on the outlet pipe 311 of the permanent magnet pump to detect the temperature and pressure of the condensate before it enters the first heater 21 and the second heater 22.

[0121] like Figure 4-6 As shown, in one embodiment, the electric regulating valve 23 includes: a valve body 231, an upper valve cover 232, a lower valve cover 233, a drive motor 234, a motor housing 235, a worm gear 236, a worm 237, a rotating shaft 238, a valve core 239, a water passage hole 2310, a fixing block 2311, a buffer groove 2312, and a buffer blade 2313;

[0122] The valve body 231 has an inlet chamber 2314, an outlet chamber 2315 and a drive chamber 2316. The inlet chamber 2314 and the outlet chamber 2315 are connected through a water passage 2310.

[0123] The upper valve cover 232 is disposed above the drive chamber 2316 and is fixedly connected to the valve body 231;

[0124] The drive motor 234 is fixedly connected to the top of the upper valve cover 232, and a motor housing 235 is provided on its exterior and fixedly connected to the upper valve cover 232.

[0125] One end of the worm gear 236 is connected to the drive motor 234, and the other end is engaged with the worm 237;

[0126] The worm gear 237 passes through the upper valve cover 232 and is fixedly connected to the rotating shaft 238;

[0127] The rotating shaft 238 passes through the upper part of the water inlet chamber 2314, and its lower end is fixedly connected to the valve core 239;

[0128] Valve core 239 is disposed in water inlet chamber 2314 and is rotatably connected to valve body 231;

[0129] The lower valve cover 233 is located below the water outlet chamber 2315 and is fixedly connected to the valve body 231.

[0130] The fixing block 2311 is located directly below the water passage hole 2310, with one end fixedly connected to the lower valve cover 233 and the other end rotatably connected to the bottom of the buffer groove 2312.

[0131] The buffer blade 2313 is fixedly connected to the inner wall of the side of the buffer groove 2312.

[0132] The working principle of the above technical solution is as follows: the remote control drive motor 234 drives the valve core 239 to rotate through the transmission of the worm gear 236, worm 237 and rotating shaft 238, thereby controlling the water flow rate by controlling the water flow area of ​​the water passage 2310. After the condensate passes through the water passage 2310, it enters the buffer tank 2312. Under the action of the buffer blades 2313, the buffer tank 2310 rotates to buffer the high-pressure condensate.

[0133] In one embodiment, the air preheater 4 is provided with a seventh temperature sensor 41 at its air inlet.

[0134] In one embodiment, a backup permanent magnet pump 324 is connected in parallel with the permanent magnet pump 39, and an eighth solenoid valve 325 and a ninth solenoid valve 326 are respectively installed on the inlet pipe and outlet pipe of the backup permanent magnet pump 324.

[0135] The beneficial effects of the above embodiments are as follows: by setting up a backup permanent magnet pump 324, when the pressure of a permanent magnet pump 39 is insufficient, the backup permanent magnet pump 324 is turned on to ensure the normal operation of the system, thereby improving the stability of the system operation.

[0136] In summary, the working process of this invention to achieve the purpose of regulating the cold end temperature of the air preheater 4 is as follows: The seventh temperature sensor 41 detects a temperature difference between the cold ends of the two air preheaters 4. The output efficiency of the permanent magnet pump 39 is adjusted according to the side with the lower temperature. The flow rate is controlled by the electric regulating valve 23 according to the outlet water temperature and outlet air temperature of the first heater 21 and the second heater 22. After the permanent magnet pump 39 increases its output efficiency, the temperature of the cold end of the air preheater 4 on the side with the lower temperature is increased, thereby reducing the power consumption of the permanent magnet pump 39, saving resources, and improving economic efficiency.

[0137] Data analysis was conducted in practical applications of this invention;

[0138] 1. Energy consumption analysis of the modified permanent magnet booster pump

[0139] This invention uses a proportional method to estimate the energy consumption variation of a permanent magnet booster pump. In the actual operation of a 500MW heater system, the permanent magnet booster pump is already operating at high power. Therefore, using the 500MW operating parameters as a baseline, a rough proportional estimation analysis of the permanent magnet booster pump under different loads is performed, resulting in the following table:

[0140]

[0141] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0142] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A kind of high-efficiency enhanced air preheater air heater energy-saving operation adjusting device, it is characterized by, The utility model relates to a kind of heating system of coal-fired power plant, including: Dust removal part (1), warm air heater heating part (2), low pressure heating part (3) and air preheater (4); The smoke inlet of the dust removal part (1) is connected with the cold end smoke outlet of the air preheater (4); The air outlet of the warm air heater heating part (2) is connected with the air inlet of the air preheater (4); Condensate water circulation loop is arranged between the warm air heater heating part (2), the low pressure heating part (3) and the dust removal part (1); Electric regulating valve (23) is arranged on the water outlet pipeline of the warm air heater heating part (2), for adjusting the working efficiency of the warm air heater heating part (2); The warm air heater heating part (2) comprises: first warm air heater (21), second warm air heater (22), the electric regulating valve (23), first warm air pipeline (24), second warm air pipeline (25), warm air water outlet pipeline (26), water supplement pipeline (27), first electromagnetic valve (28), first temperature sensor (29), first pressure sensor (210), second temperature sensor (211), second pressure sensor (212), third temperature sensor (213) and fourth temperature sensor (214); The water outlet pipeline of the low pressure heating part (3) is connected with the water inlet of the first warm air heater (21) and the second warm air heater (22); The first warm air pipeline (24) is connected with the water outlet of the first warm air heater (21); The second warm air pipeline (25) is connected with the water outlet of the second warm air heater (22); The electric regulating valve (23) is arranged on the first warm air pipeline (24) and the second warm air pipeline (25) respectively; The warm air water outlet pipeline (26) is connected with the first warm air pipeline (24) and the second warm air pipeline (25) at one end, and is connected with the water inlet of the low pressure heating part (3) at the other end; The water supplement pipeline (27) is connected with the warm air water outlet pipeline (26) at one end, and is connected with flue gas cold water pipeline (15) at the other end; The first temperature sensor (29) and the first pressure sensor (210) are arranged on the first warm air pipeline (24); The second temperature sensor (211) and the second pressure sensor (212) are arranged on the second warm air pipeline (25); The first electromagnetic valve (28) is arranged on the water supplement pipeline (27); The third temperature sensor (213) and the fourth temperature sensor (214) are arranged at the air outlet of the first warm air heater (21) and the second warm air heater (22) respectively.

2. The energy saving operation adjusting device for high efficiency enhanced air preheater heater according to claim 1, characterized in that, The dust removal part (1) comprises: flue gas cooler (11), dust collector (12), desulfurization tower (13), flue gas reheater (14), flue gas cold water pipeline (15), flue gas hot water pipeline (16), heat medium auxiliary heater (17) and first water pump (18); The smoke inlet of the flue gas cooler (11) is connected with the smoke 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. The flue gas cold water pipeline (15) is connected with the water inlet of the flue gas cooler (11) at one end and connected with the water outlet of the flue gas reheater (14) at the other end; The flue gas hot water pipeline (16) is connected with the water outlet of the flue gas cooler (11) at one end and connected with the water inlet of the flue gas reheater (14) at the other end; The heat medium auxiliary heater (17) is arranged on the flue gas hot water pipeline (16); The first water pump (18) is arranged on the flue gas cold water pipeline (15).

3. The energy saving operation adjusting device for high efficiency enhanced air preheater heater according to claim 2, 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 pipeline (33), a second low-pressure pipeline (34), a condensate heater (35), a first condensate pipeline (36), a second condensate pipeline (37), a third condensate pipeline (38), a permanent magnet pump (39), a permanent magnet pump water inlet pipeline (310), a permanent magnet pump water outlet pipeline (311), a drain pipeline (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). The water inlet of the first low-pressure heater (31) is connected with the warm air outlet pipeline (26); The first low-pressure pipeline (33) is connected with the water outlet of the first low-pressure heater (31) at one end and connected with the water inlet of the second low-pressure heater (32) at the other end; The second low-pressure pipeline (34) is connected with the water outlet of the second low-pressure heater (32) at one end and connected with the permanent magnet pump water inlet pipeline (310) at the other end; The permanent magnet pump water inlet pipeline (310), the permanent magnet pump (39), and the permanent magnet pump water outlet pipeline (311) are connected in sequence, wherein the water outlet of the permanent magnet pump (39) is connected with the water inlets of the first warm air heater (21) and the second warm air heater (22); The first condensate pipeline (36) is connected with the warm air outlet pipeline (26) at one end and connected with the water inlet of the condensate heater (35) at the other end; The second condensate pipeline (37) is connected with the water outlet of the condensate heater (35) at one end and connected with the first low-pressure pipeline (33) at the other end; The third condensate pipeline (38) is connected with the second condensate pipeline (37) at one end and connected with the second low-pressure pipeline (34) at the other end; The drain pipeline (312) is connected with the flue gas hot water pipeline (16) at one end and connected with the permanent magnet pump water inlet pipeline (310) at the other end; The second water pump (317) and the second electromagnetic valve (318) are arranged on the first condensate pipeline (36); The third electromagnetic valve (319) is arranged on the second condensate pipeline (37); The fourth electromagnetic valve (320) is arranged on the third condensate pipeline (38); The fifth electromagnetic valve (321) is arranged on the permanent magnetic pump water inlet pipeline (310); The sixth electromagnetic valve (322) is arranged on the permanent magnetic pump water outlet pipeline (311); The seventh electromagnetic valve (323) is arranged on the drain pipeline (312); The fifth temperature sensor (313) and the third pressure sensor (314) are arranged on the second low pressure pipeline (34); The sixth temperature sensor (315) and the fourth pressure sensor (316) are arranged on the permanent magnetic pump water outlet pipeline (311).

4. The energy saving operation adjusting device for high efficiency enhanced air preheater heater according to claim 3, characterized in that, The electric regulating valve (23) comprises 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), a water passing hole (2310), a fixed block (2311), a buffer groove (2312) and a buffer blade (2313). The valve body (231) has 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 the water passing hole (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 at the top of the upper valve cover (232), and the outside of the driving motor (234) is provided with the motor shell (235) which is fixedly connected with the upper valve cover (232). One end of the worm wheel (236) is connected with the driving motor (234), and the other end is meshingly connected with the worm (237). The worm (237) penetrates through the upper valve cover (232) and is fixedly connected with the rotating shaft (238). The rotating shaft (238) penetrates through the upper side of the water inlet cavity (2314) and is fixedly connected with the valve core (239) at the lower end. The valve core (239) is arranged in the water inlet cavity (2314) and is 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 fixed block (2311) is arranged directly below the water passing hole (2310), one end of the fixed block (2311) is fixedly connected with the lower valve cover (233), and the other end is rotatably connected with the bottom of the buffer groove (2312). The buffer blade (2313) is fixedly connected to the inner wall of the side of the buffer groove (2312).

5. The energy saving operation adjusting device for high efficiency enhanced air preheater heater according to claim 1, characterized in that, The air preheater (4) is provided with a seventh temperature sensor (41) at the air inlet.

6. The energy saving operation adjusting device for high efficiency enhanced air preheater heater according to claim 3, characterized in that, The permanent magnetic pump (39) is provided with a standby permanent magnetic pump (324) in parallel, and an eighth electromagnetic valve (325) and a ninth electromagnetic valve (326) are arranged on the water inlet pipeline and the water outlet pipeline of the standby permanent magnetic pump (324) respectively.

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