CN217207054U - Hot air purging system of coal-fired generating set and coal-fired generating set - Google Patents
Hot air purging system of coal-fired generating set and coal-fired generating set Download PDFInfo
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- CN217207054U CN217207054U CN202220829901.1U CN202220829901U CN217207054U CN 217207054 U CN217207054 U CN 217207054U CN 202220829901 U CN202220829901 U CN 202220829901U CN 217207054 U CN217207054 U CN 217207054U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
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Abstract
The utility model discloses a hot air purging system of a coal-fired generator set and the coal-fired generator set, which comprises an operating generator set and a standby generator set; the operation of the generator set comprises operation of a primary air fan and operation of an air preheater; the standby generator set comprises a standby induced draft fan; a purging air inlet pipeline and a purging air outlet pipeline are arranged on the standby induced draft fan; the blowing air inlet pipeline comprises an air inlet section and a mixing section, and the free end of the air inlet section is connected with the standby induced draft fan; an air outlet of the primary air fan is provided with a first cold air outlet pipeline and a second cold air outlet pipeline; the free end of the first cold air outlet pipeline is connected with an air inlet of the running air preheater, and the free end of the second cold air outlet pipeline is connected with the mixing section; an air outlet of the running air preheater is provided with an air preheater outlet hot primary air pipeline, and the free end of the air preheater outlet hot primary air pipeline is connected with the mixing section. The system solves the problem of jamming of the blade during the shutdown of the induced draft fan.
Description
Technical Field
The utility model belongs to coal fired power plant boiler field relates to a coal fired generating set hot air purging system and a coal fired generating set.
Background
The induced draft fan is an important auxiliary equipment in the boiler of the coal-fired power plant, and has the functions of discharging flue gas and fly ash generated by combustion in a hearth out of the boiler and maintaining the micro negative pressure at the outlet of the hearth of the boiler. The fan for the power station mainly comprises a centrifugal fan and an axial flow fan, wherein the capacity of the centrifugal fan is limited by the strength of an impeller material and cannot be correspondingly increased along with the increase of the capacity of a boiler; the axial flow fan is generally applied to domestic large coal-fired power plant boilers due to the advantages of compact structure, small volume, light weight, higher fan operation efficiency and the like.
Most domestic coal-fired power plant boilers adopt a Selective Catalytic Reduction (SCR) technology to control nitrogen oxides, and the catalyst is used for removing SO in part of flue gas while denitrating the flue gas 2 Oxidation to SO 3 ，SO 3 And the ammonium bisulfate is generated with the ammonia which does not participate in the reaction. Usually, the ammonia escape (namely, the ammonia which does not participate in the reaction) of the denitration system is 3ppm-5ppm, the liquid phase temperature interval of the ammonium bisulfate is 149 ℃ -232 ℃, the temperature interval range of the ammonium bisulfate changing from the gas state to the liquid state is just the temperature interval of the flue gas flowing through the lower section of the air preheater, and the ammonium bisulfate is easy to deposit on the heat storage element of the air preheater due to the strong viscosity of the liquid ammonium bisulfate, so that the air preheater is seriously blocked by ashAnd the pressure difference on the flue gas side reaches 2-3 kPa.
The smoke discharge temperature of some coal-fired power plant boilers is higher and reaches 150 ℃, so that ammonium bisulfate in the smoke is deposited at the joint of the root of a draught fan blade and a hub, and the blade of an axial-flow draught fan with an adjustable movable blade is blocked; some coal fired power plant boiler air heater cause serious stifled ash because of the ammonium bisulfate deposit, for solving the stifled ash problem of air heater on line, adopt the biased operation mode of air supply, artificially improve air heater export gas temperature, evaporate the ammonium bisulfate gasification of deposit at air heater heat storage element, however volatile ammonium bisulfate does not disappear, only condense once more at the suitable temperature interval in air heater low reaches, thereby cause the ammonium bisulfate deposit at draught fan blade root, blade and wheel hub bonding bite, draught fan casing internals or coupling piece corruption, the fracture of inefficacy. Current hardly changes when the machine starting process of certain power plant unit discovers that the movable blade aperture of the induced draft fan is adjusted, the induced draft fan vibrates up to 4.6mm/s, and the fan disintegrates to discover that there is more verdigris between petiole and copper bush, and this is because take place the chemical reaction process between ammonium bisulfate and the copper bush, leads to the corrosion of copper bush, and then causes the bite of a plurality of blades.
When the unit operates and the induced draft fan operates, the smoke in the shell of the induced draft fan is in a flowing state, and the opening degree of the blades of the induced draft fan is continuously adjusted along with the change of the load of the unit, so that the induced draft fan does not have the problem of blade jamming during operation. When the unit is shut down, the draught fan is shut down for standby, the fluid stagnation in the draught fan casing, ammonium bisulfate deposit in the flue gas at blade root, connector, internals department in the casing, cause the adjustable axial-flow type draught fan blade bite of movable vane, internals or connector corruption, inefficacy fracture.
In order to solve the problem of blade jamming during the shutdown of the fan, a fan manufacturer requires that the hydraulic oil station is started every 6 to 8 hours within the shutdown time of the fan to control the fan blade to be cycled for 2 to 3 times from the closing to the maximum opening and then to the closing; researchers also propose to improve the blade sealing structure, and a primary seal is added on the original seal, and the original seal is changed into a double-channel wear-resistant sealing ring. However, the maintenance workload of the operation and maintenance personnel of the power plant is increased by carrying out the full-stroke activity of the blades on each shift, the inside of the hub of the fan needs to be disassembled and modified for modifying the sealing structure of the blades, the construction period is long, and the technical requirement on a modification unit is high.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides a coal-fired generating set hot air purge system and a coal-fired generating set to effectively prevent the blade bite during generating set's draught fan from shutting down, prolonged the life of equipment.
The utility model discloses a realize through following technical scheme:
a hot air purging system of a coal-fired generating set comprises an operating generating set and a standby generating set;
the operation generator set comprises an operation primary air fan and an operation air preheater;
the standby generator set comprises a standby induced draft fan;
a purging air inlet pipeline and a purging air outlet pipeline are arranged on the standby induced draft fan;
the blowing air inlet pipeline comprises an air inlet section and a mixing section which are connected, and the free end of the air inlet section is connected with the standby induced draft fan;
the air outlet of the primary air fan is provided with a first cold air outlet pipeline and a second cold air outlet pipeline;
the free end of the first cold air outlet pipeline is connected with an air inlet of the running air preheater, and the free end of the second cold air outlet pipeline is connected with the mixing section;
the air outlet of the operation air preheater is provided with an air preheater outlet hot primary air pipeline, and the free end of the air preheater outlet hot primary air pipeline is connected with the mixing section.
Preferably, electric regulating valves are arranged on the second cold air outlet pipeline and the hot primary air pipeline at the outlet of the air preheater.
Preferably, the air inlet section and the blowing air outlet pipeline are both provided with metal expansion joints.
Preferably, the air inlet section and the blowing air outlet pipeline are both provided with stop valves.
Preferably, the inside of air inlet section is equipped with sweeps wind temperature measuring device and pressure measurement device.
Preferably, the purging air inlet pipeline is arranged close to a blade of the standby induced draft fan.
Preferably, the purging air inlet pipeline is made of carbon steel, and the purging air outlet pipeline is made of stainless steel.
Preferably, a plurality of purging air inlets are formed in the standby induced draft fan along the circumferential direction of the standby induced draft fan; and the plurality of blowing air inlets are communicated with the blowing air inlet pipeline.
Preferably, the standby induced draft fan is provided with a purging air outlet, and the purging air outlet is communicated with a purging air outlet pipeline; and the outlet of the running air preheater is provided with a hot secondary air channel, and the free end of the blowing air outlet pipeline is connected with the hot secondary air channel.
A coal-fired generating set comprises the hot air purging system of the coal-fired generating set.
Compared with the prior art, the utility model discloses following profitable technological effect has:
a hot air purging system of a coal-fired generating set utilizes cold air and hot air generated by a primary air fan and an air preheater in the running generating set to be mixed and then introduced into a shell of a stopped induced draft fan, so that the problem of jamming of blades during the stop of the induced draft fan is effectively solved while resources are effectively utilized.
Furthermore, the electric regulating valve enables the regulation of the cold air passing through the second cold air outlet pipeline and the hot air passing through the air preheater outlet hot primary air pipeline to be more convenient.
Furthermore, the metal expansion joint effectively relieves the radial expansion and the axial expansion of the blowing air inlet pipeline and the blowing air outlet pipeline in the using process, and ensures the safety of the equipment operation.
Furthermore, the stop valve enables the device to be started and closed more conveniently.
Furthermore, the inside of air inlet section is equipped with sweeps wind temperature measuring device and pressure measurement device, is favorable to sweeping the temperature and the pressure of wind and controlling, ensures the security of equipment operation.
Furthermore, the purging air inlet pipeline is arranged close to the blade of the shutdown induced draft fan, so that ammonium bisulfate and other pollutants deposited on the blade and the root of the blade can be effectively removed.
Furthermore, the cost of the equipment can be effectively controlled by adopting the carbon steel as the purging air inlet pipeline, and the stainless steel as the purging air outlet pipeline effectively avoids the corrosion of the flue gas with ammonium bisulfate on the pipeline.
Furthermore, a plurality of blowing air inlets are formed in the stop-preparation draught fan along the circumferential direction of the stop-preparation draught fan, the blades and the sediments at the roots of the blades can be gasified and removed from different angles, and the removal efficiency is effectively improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic view of the structural connection of the present invention;
fig. 2 is the utility model discloses in stop to be equipped with on the draught fan sweep the wind import and sweep the arrangement sketch map of wind export.
Wherein: 11. the method comprises the following steps of operating a primary air fan, 12 operating an air preheater, 13 operating a dust remover, 14 operating an induced draft fan, 15 operating an air feeder, 21 stopping the primary air fan, 22 stopping the air preheater, 23 stopping the dust remover, 24 stopping the induced draft fan, 25 stopping the air feeder, 26 purging an air inlet, 27 purging an air outlet, 3 purging an air inlet pipeline, 31, an air inlet section, 32, a mixing section, 4 purging an air outlet pipeline, 51, a first cold air outlet pipeline, 52, a second cold air outlet pipeline, 6, an air preheater outlet hot primary air pipeline, 7, an electric regulating valve, 8, a metal expansion joint, 9, a stop valve, 10 and a hot secondary air duct.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that, if the terms "upper", "lower", "horizontal", "inner", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship that the product of the present invention is usually placed when in use, the description is only for convenience of description and simplification, but the indication or suggestion that the device or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be interpreted as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless explicitly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
The present invention will be described in further detail with reference to the accompanying drawings:
as shown in fig. 1, a hot air purging system of a coal-fired power generating unit comprises an operating power generating unit and a standby power generating unit;
the operation generator set comprises an operation primary air fan 11, an operation air preheater 12, an operation dust remover 13, an operation induced draft fan 14 and an operation blower 15; the standby generator set comprises a standby primary fan 21, a standby air preheater 22, a standby dust remover 23, a standby induced draft fan 24 and a standby blower 25; a purging air inlet pipeline 3 and a purging air outlet pipeline 4 are arranged on the standby draught fan 24; the blowing air inlet pipeline 3 comprises an air inlet section 31 and a mixing section 32 which are connected, and the free end of the air inlet section 31 is connected with the standby induced draft fan 24; the air outlet of the primary air running fan 11 is provided with a first cold air outlet pipeline 51 and a second cold air outlet pipeline 52; the free end of the first cold air outlet pipeline 51 is connected with the air inlet of the running air preheater 12, and the free end of the second cold air outlet pipeline 52 is connected with the mixing section 32; an air outlet of the running air preheater 12 is provided with an air preheater outlet hot primary air pipeline 6, and the free end of the air preheater outlet hot primary air pipeline 6 is connected with the mixing section 32. The second cold air outlet pipeline 52 and the air preheater outlet hot primary air pipeline 6 are both provided with an electric regulating valve 7.
And the air inlet section 31 and the purging air outlet pipeline 4 are both provided with metal expansion joints 8. The air inlet section 31 and the blowing air outlet pipeline 4 are provided with stop valves 9. The inside of air inlet section 31 is equipped with sweeps wind temperature measuring device and pressure measurement device. And the blowing air inlet pipeline 3 is arranged close to the blade of the standby induced draft fan 24. The blowing air inlet pipeline 3 is made of carbon steel, and the blowing air outlet pipeline 4 is made of stainless steel.
As shown in fig. 2, the standby induced draft fan 24 is provided with a plurality of purge air inlets 26 along the circumferential direction thereof; the plurality of purging air inlets 26 are all communicated with the purging air inlet pipeline 3. And a blowing air outlet 27 is arranged on the standby induced draft fan 24, and the blowing air outlet 27 is communicated with the blowing air outlet pipeline 4. The outlet of the running air preheater 12 is also provided with a hot secondary air duct 10, and the free end of the purging air outlet pipeline 4 is connected with the hot secondary air duct 10.
The utility model discloses an only show a set of hot-blast system that sweeps in the drawing, when the operation generating set in this embodiment changes with the generating set that parks, also can set up corresponding the same pipeline and adjusting device, the gasification of deposit is got rid of in realizing the generating set blade of parkking through same principle.
The utility model discloses to move in the hot-blast shut down unit draught fan casing of introducing of unit, with sedimentary ammonium bisulfate high temperature gasification in the casing, through hot-blast detain the flue gas in with the casing, ammonium bisulfate gas brings out the draught fan of stopping up, solved movable blade adjustable axial-flow draught fan blade bite from the source, internals and connector corrosion fracture problem, switch through the valve, adjust and can solve the corrosion problem in the shut down unit draught fan casing, the maintenance work volume has been reduced, and the transformation is simple, the investment cost is less.
The coal-fired thermal power plant is generally provided with a plurality of generator sets, the number of times and time for the unit to be scheduled are increased along with the wide implementation of deep peak shaving, and at least one generator set of the thermal power plant can be generally ensured to operate during the power grid scheduling so as to ensure the safety of a power transmission line, the normal operation of the thermal power plant and the flexibility of the deep peak shaving. The utility model discloses utilize generating set boiler hot air mixture to sweep in the unit draught fan casing of stopping transport to solve stopping transport unit draught fan blade bite, internals and connector corrosion problem.
When the draught fan normally operates, the stop valve on the purging inlet pipeline and the stop valve on the purging outlet pipeline are closed, and the hot air purging system is isolated from the draught fan.
When the draught fan is stopped, closing the front and rear isolating doors of the draught fan, opening the stop valves 9 on the purging air inlet pipeline 31 and the purging air outlet pipeline 4, and enabling the air temperature in the second cold air outlet pipeline 52 to be close to the room temperature and to be about 10-40 ℃; the air temperature in the hot primary air pipeline 6 at the outlet of the air preheater is about 320-340 ℃, the air quantity of the cold air in the second cold air outlet pipeline 52 and the hot air in the hot primary air pipeline 6 at the outlet of the air preheater is adjusted by electric adjusting valves 7 on respective pipelines, after adjustment, the temperature of the mixed blowing hot air is 160-230 ℃ (if ammonia of a denitration system escapes within 3ppm during the operation of the unit, the temperature of the blowing hot air is controlled to be 160-180 ℃), if the ammonia of the denitration system escapes above 3ppm during the operation of the unit, the temperature of the blowing hot air is controlled to be 180-230 ℃), the air pressure of the blowing hot air is 5-7 kPa, the mixed hot air enters the shell of the induced draft fan through a blowing inlet 26, ammonium bisulfate deposited between the root of the movable blade and the hub is volatilized into a gas state, and the mixed air is mixed with residual flue gas in the shell and then flows out of the induced draft fan through a blowing outlet 27, and enters the hot secondary air duct through the blowing air outlet pipeline 4, and the pressure in the hot secondary air duct is about 1kPa, so that the air in the blowing air outlet pipeline 4 can smoothly enter the hot secondary air duct. Compared with the air quantity in the hot secondary air channel, the volume of the mixture of the blowing hot air and the residual flue gas is extremely small, and the reliability of the running unit is not influenced.
The utility model provides a when the hot-blast system of sweeping puts into operation, because of the temperature is higher in the casing, for guaranteeing fan bearing equipment's reliability, should ensure that fan lubricating oil system, oil cooler equipment normally put into operation to guarantee that fan bearing temperature is no longer than 75 ℃.
A coal-fired generating set comprises the hot air purging system.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A hot air purging system of a coal-fired generating set is characterized by comprising an operating generating set and a standby generating set;
the running generator set comprises a running primary air fan (11) and a running air preheater (12);
the standby generator set comprises a standby induced draft fan (24);
a blowing air inlet pipeline (3) and a blowing air outlet pipeline (4) are arranged on the standby induced draft fan (24);
the blowing air inlet pipeline (3) comprises an air inlet section (31) and a mixing section (32) which are connected, and the free end of the air inlet section (31) is connected with the standby induced draft fan (24);
an air outlet of the primary operation fan (11) is provided with a first cold air outlet pipeline (51) and a second cold air outlet pipeline (52);
the free end of the first cold air outlet pipeline (51) is connected with an air inlet of the running air preheater (12), and the free end of the second cold air outlet pipeline (52) is connected with the mixing section (32);
the air outlet of the operation air preheater (12) is provided with an air preheater outlet hot primary air pipeline (6), and the free end of the air preheater outlet hot primary air pipeline (6) is connected with the mixing section (32).
2. The hot air blowing system of the coal-fired power generating set according to claim 1, wherein the second cold air outlet pipeline (52) and the air preheater outlet hot primary air pipeline (6) are provided with electric regulating valves (7).
3. The hot air blowing system of the coal-fired power generating unit according to claim 1, wherein the air inlet section (31) and the blowing air outlet pipeline (4) are provided with metal expansion joints (8).
4. The hot air blowing system of the coal-fired power generating unit according to claim 1, wherein the air inlet section (31) and the blowing air outlet pipeline (4) are provided with stop valves (9).
5. The hot air blowing system of the coal-fired power generating unit according to claim 1, wherein a blowing air temperature measuring device and a pressure measuring device are arranged inside the air inlet section (31).
6. The hot air purging system of the coal-fired power generating unit according to claim 1, wherein the purging air inlet pipeline (3) is arranged close to a blade of the standby induced draft fan (24).
7. The hot air blowing system of the coal-fired power generating unit according to claim 1, wherein the blowing air inlet pipeline (3) is made of carbon steel, and the blowing air outlet pipeline (4) is made of stainless steel.
8. The hot air purging system of the coal-fired power generating unit according to claim 1, wherein a plurality of purging air inlets (26) are arranged on the standby induced draft fan (24) along the circumferential direction thereof; the plurality of purging air inlets (26) are communicated with the purging air inlet pipeline (3).
9. The hot air purging system of the coal-fired power generating unit according to claim 1, wherein a purging air outlet (27) is formed in the standby induced draft fan (24), and the purging air outlet (27) is communicated with the purging air outlet pipeline (4); the outlet of the running air preheater (12) is provided with a hot secondary air duct (10), and the free end of the blowing air outlet pipeline (4) is connected with the hot secondary air duct (10).
10. A coal-fired power generating unit is characterized by comprising the hot air purging system of the coal-fired power generating unit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220829901.1U CN217207054U (en) | 2022-04-11 | 2022-04-11 | Hot air purging system of coal-fired generating set and coal-fired generating set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220829901.1U CN217207054U (en) | 2022-04-11 | 2022-04-11 | Hot air purging system of coal-fired generating set and coal-fired generating set |
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| CN217207054U true CN217207054U (en) | 2022-08-16 |
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| CN202220829901.1U Active CN217207054U (en) | 2022-04-11 | 2022-04-11 | Hot air purging system of coal-fired generating set and coal-fired generating set |
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| CN (1) | CN217207054U (en) |
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- 2022-04-11 CN CN202220829901.1U patent/CN217207054U/en active Active
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