CN214249672U - Fluidized air system for solving fly ash deposition in flue - Google Patents
Fluidized air system for solving fly ash deposition in flue Download PDFInfo
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- CN214249672U CN214249672U CN202022732518.8U CN202022732518U CN214249672U CN 214249672 U CN214249672 U CN 214249672U CN 202022732518 U CN202022732518 U CN 202022732518U CN 214249672 U CN214249672 U CN 214249672U
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- flue
- flue gas
- gas cooler
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- fly ash
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Abstract
The utility model discloses a fluidized air system for solving the deposition of fly ash in a flue, which comprises a purging system, an air box, a flue gas cooler flue, a hot primary air duct and a hot secondary air duct; the blowing system comprises a blowing pipeline, the air box is located at the bottom of the flue gas cooler, the hot primary air channel is communicated with the inlet of the air box, the outlet of the air box is communicated with the hot secondary air channel, the bottom of the flue gas cooler is provided with an installation groove hole, the blowing pipeline is embedded in the installation groove hole, the blowing pipeline is provided with a first blowing hole and a second blowing hole, the system can effectively solve the problem of bottom fly ash deposition in the flue, and the system is simple and low in investment cost.
Description
Technical Field
The utility model belongs to the technical field of generating set, a solve sedimentary fluidization wind system of flying dust in flue is related to.
Background
The ultra-low emission technology in the field of thermal power is widely applied and requires that the dust concentration at the outlet of a chimney is not more than 10mg/m3NOx concentration of not more than 50mg/m3，SO2The concentration is not more than 35mg/m3The method contributes to the power for winning the blue sky guard war and plays a role in the meter rate for the ultra-low emission reconstruction of the non-electric industry. Meanwhile, with the deep development of the national energy saving and emission reduction work, the national energy source bureau issues the spirit of 'the notification of the national energy source bureau comprehensive department on the decomposition and implementation of the coal and electricity energy saving, emission reduction, upgrading and reconstruction task target', and puts higher requirements on the energy consumption level of the thermal power generating unit. In 2020, the average coal consumption of power supply after the existing thermal power generating unit is transformed is lower than 310 g/(kWh.h), wherein the average coal consumption of power supply after the existing unit (except for the air cooling unit) with 60 ten thousand kilowatts and above is transformed is lower than 300 g/(kWh.h).
The flue gas cooler is arranged at the inlet of the electrostatic dust collector, so that the flue gas temperature at the inlet of the dust collector is reduced, the fly ash specific resistance is reduced, the dust removal efficiency is improved, and the water consumption of the desulfurizing tower is reduced; meanwhile, the heat recovered by the flue gas cooler can be used for heating condensed water, a heating air heater, a heating flue gas reheater and the like of a heat regenerative system, and can reduce the coal consumption of unit power generation by 2-4 g/(kW & h), so that the heat recovery system is rapidly developed under the large background of ultra-low emission and energy-saving emission reduction policies.
Although the flue gas cooler is arranged in front of the electrostatic dust collector, the low-temperature dust removal effect can be exerted, and the dust removal efficiency is improved, the fly ash content in the flue gas in front of the dust collector is high, especially the coal quality of domestic thermal power generating units is unstable, the ash content is integrally high, the content of the received base ash is generally over 20%, and the ash deposition risk is high. The denitration system after ultralow emission basically adopts an SCR technology or an SNCR + SCR technology, and because the coal quality of a thermal power plant in China is poor, the coal quality is unstable and the load change range is large, the phenomenon that the ammonia escape of a unit exceeds the standard is common, and the ash deposition risk is aggravated because some ammonia escape exceeds 10 ppm.
The designed flow speed of the flue gas in the flue gas cooler is generally controlled to be about 10m/s, but the flow speed of the flue gas in the large and small heads of the inlet of the flue gas cooler, the overhaul channel and the large and small heads of the outlet of the flue gas cooler is suddenly reduced to about 5m/s, so that fly ash is easy to settle at the bottom of the flue. When ash blockage occurs at the bottom of the flue, the side resistance of the flue gas is obviously increased, the flue gas flow rate of the part without ash blockage is increased, abrasion is easily caused, and then leakage is caused, so that the safety of the flue gas cooler body and the electrostatic dust collector is endangered.
Practical operation experience shows that when the temperature of the flue gas is increased to over 180 ℃, the ammonium bisulfate is slowly decomposed until the flue gas returns to normal. At present, a method for reducing ash deposition at the bottom of a flue comprises a compressed air fluidizing air system, wherein a compressed air pipe is arranged at the bottom of the flue, and fly ash deposited at the bottom is fluidized by cold air and then taken away by flue gas. The method of continuously dredging ash can also be adopted to solve the problem of ash deposition at the bottom of the flue, but the system is complex, the investment is high, and the practical application cases are few.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a fluidization wind system of flying dust deposit in solving the flue, this system can effectively solve the sedimentary problem of bottom flying dust in the flue, and the system is simple, and investment cost is low.
In order to achieve the purpose, the fluidized air system for solving the problem of fly ash deposition in the flue comprises a purging system, an air box, a flue gas cooler flue, a hot primary air duct and a hot secondary air duct;
the purging system comprises a purging pipeline, the air box is located at the bottom of the flue gas cooler, the hot primary air channel is communicated with the inlet of the air box, the outlet of the air box is communicated with the hot secondary air channel, the bottom of the flue gas cooler is provided with an installation groove hole, the purging pipeline is embedded in the installation groove hole, and the purging pipeline is provided with a first purging hole and a second purging hole.
The purging system further comprises a rotary motor, and the end part of the purging pipeline is connected with the rotary motor;
the flue gas cooler flue comprises an inlet flue, a high-temperature section of the flue gas cooler, an overhaul channel, a low-temperature section of the flue gas cooler and an outlet flue which are sequentially communicated along the flowing direction of flue gas.
The hot primary air duct is connected with the inlet of the air box through an inlet air pipeline and an inlet valve.
The outlet of the air box is connected with the hot secondary air duct through an outlet valve, a thermocouple and an outlet air pipeline.
The blowing directions of the first blowing holes and the second blowing holes form an included angle of 90 degrees.
The purging system is arranged at the bottom of the inlet flue, the bottom of the high-temperature section of the flue gas cooler, the bottom of the overhaul channel, the bottom of the low-temperature section of the flue gas cooler and the bottom of the outlet flue.
The utility model discloses following beneficial effect has:
the sedimentary fluidization wind system of flying dust in solution flue when concrete operation, the bottom of hot primary air heating flue through about 300 ℃, the wind temperature through control bellows export is not less than 200 ℃, make the temperature of flue bottom control all the time about 200 ℃, thoroughly solve ammonium bisulfate and acid mist in the flying dust and condense, keep the flying dust in dry state, recycle purge system blows up the flying dust, and take away by the flue gas, because there is the flying dust to exist on the flue bottom plate, relatively poor with the heat transfer capacity of flue gas, consequently, the heat of hot primary air heating flue bottom plate loss is very little, and hot primary air returns hot overgrate air after the heating, entire system can ignore to the coal consumption influence of unit, in order to solve the sedimentary problem of bottom flying dust in the flue, and the system is simple, and low in investment cost.
Furthermore, the sweeping pipeline can be rotated into a non-sweeping state, a forward sweeping state and a backward sweeping state through the rotary motor, and the fly ash on the flue bottom plate can be removed in an all-round manner.
Drawings
Fig. 1 is a side view of the present invention;
fig. 2 is a top view of the present invention;
FIG. 3 is a schematic view of the middle purge line 9-1 of the present invention;
FIG. 4 is a schematic view of the non-purging state of the purging pipeline 9-1 according to the present invention;
FIG. 5 is a schematic diagram of the forward purging state of the purging line 9-1 according to the present invention;
fig. 6 is a schematic diagram of the backward purging state of the middle purging pipeline 9-1 according to the present invention.
Wherein, 1 is an inlet flue, 2 is a high-temperature section of a flue gas cooler, 3 is an overhaul channel, 4 is a low-temperature section of the flue gas cooler, 5 is an outlet flue, 6 is a wind box, 7-1 is an inlet air pipeline, 7-2 is an outlet air pipeline, 8-1 is an inlet valve, 8-2 is an outlet valve, 9-1 is a purging pipeline, 9-2 is a first purging hole, 9-3 is a second purging hole, 9-4 is an air channel, 9-5 is a rotary motor, 10 is a thermocouple, 11 is a hot primary air channel, and 12 is a hot secondary air channel.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1 to 3, the fluidized air system for solving the problem of fly ash deposition in the flue of the present invention includes a purging system, an air box 6, a flue gas cooler flue, a hot primary air duct 11 and a hot secondary air duct 12; the purging system comprises a purging pipeline 9-1, the air box 6 is located at the bottom of a flue of the flue gas cooler, a hot primary air duct 11 is communicated with an inlet of the air box 6, an outlet of the air box 6 is communicated with a hot secondary air duct 12, a mounting groove hole is formed in the bottom of the flue gas cooler, the purging pipeline 9-1 is embedded in the mounting groove hole, and a first purging hole 9-2 and a second purging hole 9-3 are formed in the purging pipeline 9-1.
The purging system further comprises a rotary motor 9-5, and the end part of the purging pipeline 9-1 is connected with the rotary motor 9-5;
the flue gas cooler flue comprises an inlet flue 1, a high-temperature section 2 of the flue gas cooler, an overhaul channel 3, a low-temperature section 4 of the flue gas cooler and an outlet flue 5 which are sequentially communicated along the flowing direction of flue gas.
The hot primary air duct 11 is connected with the inlet of the air box 6 through an inlet air duct 7-1 and an inlet valve 8-1.
The outlet of the air box 6 is connected with a hot secondary air duct 12 through an outlet valve 8-2, a thermocouple 10 and an outlet air pipeline 7-2.
The blowing direction of the first blowing hole 9-2 and the second blowing hole 9-3 forms an included angle of 90 degrees.
The purging system is arranged at the bottom of the inlet flue 1, the bottom of the high-temperature section 2 of the flue gas cooler, the bottom of the overhaul channel 3, the bottom of the low-temperature section 4 of the flue gas cooler and the bottom of the outlet flue 5.
The medium in the inlet air pipeline 7-1 is hot primary air at the temperature of about 300 ℃.
The temperature of the hot air in the outlet air pipeline 7-2 is controlled to be more than 200 ℃.
Referring to fig. 4, 5 and 6, the output shaft of the rotary motor 9-5 is connected with the purge line 9-1, and an air passage 9-4 is formed inside the purge line 9-1, so that the purge line 9-1 is rotated into a non-purge state, a forward purge state and a backward purge state.
The utility model discloses a concrete working process does:
hot primary air with the temperature of 300 ℃ in the hot primary air duct 11 is sent into an air box 6 at the bottom of a flue of the flue gas cooler through an inlet air duct 7-1, the bottom of the flue gas cooler is heated to about 200 ℃ by utilizing hot air, ammonium bisulfate in deposited ash is evaporated, acid mist cannot be condensed, the deposited ash at the bottom of the flue gas cooler is always in a dry state, high-pressure hot air in the air box 6 is led to the bottom of the flue by utilizing a purging system to form hot air purging, a first purging hole 9-2 and a second purging hole 9-3 which are 90 degrees to each other are arranged on a purging duct 9-1, and forward purging and backward purging are formed by matching with a rotary motor 9-5, so that the purging effect is greatly improved. The heated air is sent back to the hot secondary air duct 12, and the energy consumption of the system is reduced. When the temperature of the hot air in the outlet air pipeline 7-2 is lower than 200 ℃, the opening degrees of the inlet valve 8-1 and the outlet valve 8-2 are increased, the hot air quantity is increased, and the temperature of the bottom of the flue gas cooler is increased.
The utility model discloses not only can arrange in entry flue 1, access way 3 and export flue 5, can also arrange in the bottom of flue gas cooler high temperature section 2 and flue gas cooler low temperature section 4. The rotary motor 9-5 is arranged outside the bellows 6, the working environment of the rotary part is good, the system reliability is high, the utility model discloses simple structure, convenient operation, the practicality is extremely strong.
Claims (7)
1. A fluidized air system for solving the problem of fly ash deposition in a flue is characterized by comprising a blowing system, an air box (6), a flue gas cooler flue, a hot primary air duct (11) and a hot secondary air duct (12);
the purging system comprises a purging pipeline (9-1), the bellows (6) is located at the bottom of a flue of the flue gas cooler, the hot primary air duct (11) is communicated with an inlet of the bellows (6), an outlet of the bellows (6) is communicated with the hot secondary air duct (12), an installation slotted hole is formed in the bottom of the flue gas cooler, the purging pipeline (9-1) is embedded in the installation slotted hole, and a first purging hole (9-2) and a second purging hole (9-3) are formed in the purging pipeline (9-1).
2. The fluidized air system for solving the problem of fly ash deposition in a flue according to claim 1, wherein the purge system further comprises a rotary motor (9-5), and an end of the purge duct (9-1) is connected with the rotary motor (9-5).
3. The fluidized air system for solving the problem of fly ash deposition in the flue according to claim 1, wherein the flue of the flue gas cooler comprises an inlet flue (1), a high temperature section (2) of the flue gas cooler, an access passage (3), a low temperature section (4) of the flue gas cooler and an outlet flue (5) which are communicated with each other in sequence along the flow direction of the flue gas.
4. The fluidized air system for solving the problem of fly ash deposition in the flue according to claim 1, wherein the hot primary air duct (11) is connected with the inlet of the wind box (6) through an inlet air duct (7-1) and an inlet valve (8-1).
5. The fluidizing air system for solving the problem of deposition of fly ash in flue duct according to claim 1, wherein the outlet of the wind box (6) is connected to the hot secondary air duct (12) through the outlet valve (8-2), the thermocouple (10) and the outlet air duct (7-2).
6. The fluidizing air system for solving the problem of deposition of fly ash in flue duct according to claim 1, wherein the blowing direction of the first blowing holes (9-2) and the second blowing holes (9-3) is at an angle of 90 °.
7. A fluidized air system for solving the problem of fly ash deposition in flues according to claim 3, characterized in that the purging system is arranged at the bottom of the inlet flue (1), the bottom of the flue gas cooler high temperature section (2), the bottom of the service aisle (3), the bottom of the flue gas cooler low temperature section (4) and the bottom of the outlet flue (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022732518.8U CN214249672U (en) | 2020-11-23 | 2020-11-23 | Fluidized air system for solving fly ash deposition in flue |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022732518.8U CN214249672U (en) | 2020-11-23 | 2020-11-23 | Fluidized air system for solving fly ash deposition in flue |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214249672U true CN214249672U (en) | 2021-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022732518.8U Active CN214249672U (en) | 2020-11-23 | 2020-11-23 | Fluidized air system for solving fly ash deposition in flue |
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| CN (1) | CN214249672U (en) |
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2020
- 2020-11-23 CN CN202022732518.8U patent/CN214249672U/en active Active
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