CN210832077U - Energy-saving anti-blocking system combining pipe type and two-bin type rotary air preheater - Google Patents
Energy-saving anti-blocking system combining pipe type and two-bin type rotary air preheater Download PDFInfo
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- CN210832077U CN210832077U CN201921122589.7U CN201921122589U CN210832077U CN 210832077 U CN210832077 U CN 210832077U CN 201921122589 U CN201921122589 U CN 201921122589U CN 210832077 U CN210832077 U CN 210832077U
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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
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model discloses a tubular and bipartition storehouse formula rotary air heater combined energy-conservation prevents stifled type system belongs to new forms of energy and energy-conserving technical field. The system comprises a two-bin rotary air preheater and a tubular air preheater. The utility model can reduce the air leakage rate of the air preheater to about 2 percent, and greatly reduce the power consumption of the auxiliary machine of the boiler; after the tubular air preheater is adopted to heat primary air, the height of a heat transfer element of the rotary air preheater can be reduced by about 1/3, the soot blower effect of the rotary air preheater is greatly improved, the resistance of the rotary air preheater is reduced, and the problem of blockage of the air preheater is solved; divide into two parts with a wind with the baffle and pass through tubular air heater, set up adjusting damper in one side wind channel, according to the reasonable control tubular air heater export primary air temperature of powder process system demand, reduce the cold primary air volume that the powder process system mixes by a wide margin, reduce boiler exhaust gas temperature, reduce the heat loss of discharging fume, improve boiler efficiency.
Description
Technical Field
The utility model relates to an energy-conservation of tubular and bipartition storehouse formula rotary air heater combination prevents stifled type air heater system belongs to new forms of energy and energy-conserving technical field, is applicable to thermal generator set.
Background
The thermal power factory all sets up air heater for reducing exhaust gas temperature, improving boiler efficiency and improving combustion-supporting wind temperature simultaneously. The air preheater mainly has two forms, namely a tubular air preheater and a rotary air preheater. The two air preheaters have the advantages and the disadvantages respectively, and the tubular air preheater has the advantages of small air leakage rate and difficult ash blockage; the disadvantages are heavy weight and susceptibility to corrosion in the low temperature range. The rotary air preheater has the advantages of small metal consumption, strong heat transfer capacity and convenient soot blowing and water washing during operation; the defects are that the air leakage rate is high, and the blockage is serious after a denitration system is put into use. Due to the characteristics, the tubular air preheater is widely applied below 200MW, and the rotary air preheater above 300MW is widely applied. In recent years, due to environmental protection requirements, after an ammonia denitration system is put into use, an air preheater is seriously blocked, particularly for a unit burning high-sulfur coal, ammonium bisulfate is deposited in the middle of a heat exchange element of a rotary air preheater, and because the height of the heat exchange element is 2.0 to 2.7 meters, ammonium bisulfate deposited ash cannot be effectively removed by soot blowers at the cold end and the hot end. Forced frequently to carry out air heater water washing and air heater and blow grey in succession, cause air heater heat transfer original paper life to shorten by a wide margin, increase the power plant and overhaul the maintenance cost.
In recent years, due to the gradual rise of the price of coal, the types of coal used by a power plant tend to be various, the quality of coal is greatly changed, particularly, moisture of coal entering a furnace and dry ash-free base volatile matters cause that the inlet air temperature and the outlet air temperature of a coal mill need to be greatly adjusted, so that the dry output is sometimes insufficient, and the output of the coal mill is limited; sometimes, a large amount of cold primary air is mixed into the coal mill, so that the exhaust gas temperature of the boiler is too high, and the efficiency of the boiler is seriously low.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a tubular and two branch storehouse formula rotary air heater combined energy-conservation prevent stifled type system for there are rotary air heater rate of leaking out big, auxiliary engine power consumption height, air heater to block up serious, the boiler exhaust gas temperature scheduling problem on the high side among the solution prior art.
The utility model provides a technical scheme that above-mentioned problem adopted is: the energy-saving anti-blocking system combining the tubular type and the two-bin type rotary air preheater is characterized by comprising the two-bin rotary air preheater for heating secondary air and the tubular type air preheater for heating primary air, wherein two groups of sealing plates are respectively arranged at the high-temperature section and the low-temperature section of the two-bin rotary air preheater, and heat transfer elements are arranged in the two-bin rotary air preheater; the tubular air preheater is arranged at the flue gas upstream of the two-bin rotary air preheater, a flue gas inlet of the tubular air preheater is connected with an outlet flue of the denitration system, an expansion joint is arranged at the flue gas inlet of the tubular air preheater, a flue gas outlet of the tubular air preheater is communicated with the flue gas inlet of the two-bin rotary air preheater, and a flue gas outlet of the two-bin rotary air preheater is communicated to the dust remover; a primary air inlet of the tubular air preheater is connected with a primary fan, a partition plate is arranged in a primary air inlet air channel of the tubular air preheater, an adjusting baffle is arranged on one side of the partition plate, and a primary air outlet of the tubular air preheater is communicated to a primary hot air main pipe; and secondary air inlets of the two-bin rotary air preheater are connected with the air feeder, and secondary air outlets of the two-bin rotary air preheater are communicated to the secondary air box.
Furthermore, the tubular air preheater can be made of common carbon steel.
Furthermore, an anti-abrasion sleeve is additionally arranged in a 30cm range of a flue gas inlet of the tubular air preheater.
Further, the axial seal and the circumferential seal of the two-bin rotary air preheater are the same as those of the traditional rotary air preheater, and flexible seal or rigid seal can be adopted.
The working method comprises the following steps that flue gas led out of a denitration system is cooled through a tubular air preheater at first, the temperature of the flue gas is reduced by 60-80 ℃, then the flue gas enters a two-bin rotary air preheater for cooling, the temperature of the flue gas is reduced by 190-210 ℃, and when the temperature of the flue gas reaches 120-140 ℃, the flue gas is discharged to an electric dust remover, and then is discharged to a chimney after being desulfurized through a draught fan; cold primary air fed from an outlet of a primary fan is heated to 220-330 ℃ by a tubular air preheater and then is fed to a hot primary air main pipe, and pulverized coal is fed to a hearth for combustion through a coal pulverizing system; the cold secondary air fed from the blower is heated to 320 ℃ by the two-bin rotary air preheater and then enters the hearth for combustion supporting.
Furthermore, the flue gas flows through the tubes of the tubular air preheater, and the primary air flows through the tubes of the tubular air preheater.
Further, the tubular air preheater heats primary air accounting for 25-30% of the total air quantity of the boiler; the two-bin rotary air preheater heats secondary air accounting for 70-75% of the total air volume of the boiler.
Furthermore, the air leakage rate of the tubular air preheater is controlled within 2 percent, and the air leakage rate of the two-bin rotary air preheater is controlled within 2 percent.
Furthermore, the primary air is divided into two parts to enter the tubular air preheater, an adjusting baffle is arranged on an air duct on one side, and the temperature of the hot primary air can be controlled through the adjusting baffle.
Compared with the prior art, the utility model, have following advantage and effect: the utility model can reduce the air leakage rate of the air preheater to about 2 percent, and greatly reduce the power consumption of the auxiliary machine of the boiler; after the tubular air preheater is adopted to heat primary air, the height of a heat transfer element of the rotary air preheater can be reduced by about 1/3, the soot blower effect of the rotary air preheater can be greatly improved, the resistance of the rotary air preheater is reduced, and the problem of blockage of the air preheater is solved; divide into two parts with the air once with the baffle and pass through tubular air heater, set up adjusting damper in one side wind channel, according to the export air temperature of powder process system demand reasonable control tubular air heater, reduce the powder process system by a wide margin and mix cold air volume once, reduce boiler exhaust gas temperature, reduce the heat loss of discharging fume, improve boiler efficiency.
Drawings
Fig. 1 is a schematic view of the overall structure of the embodiment of the present invention.
FIG. 2 is a schematic top view of a two-bin rotary air preheater according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a tubular air preheater according to an embodiment of the present invention.
In the figure: the device comprises a two-bin rotary air preheater 1, a tubular air preheater 2, an expansion joint 3, a regulating baffle 4, a primary fan 5, a blower 6, a partition plate 7, a heat transfer element 8 and a sealing plate 9.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Referring to fig. 1 to 3, the energy-saving anti-blocking system combining the tubular type and the two-bin type rotary air preheater in the embodiment includes a two-bin type rotary air preheater 1 for heating the secondary air and a tubular air preheater 2 for heating the primary air, two sets of sealing plates 9 are respectively disposed at a high temperature section and a low temperature section of the two-bin type rotary air preheater 1, and a heat transfer element 8 is disposed in the two-bin type rotary air preheater 1; the tubular air preheater 2 is arranged at the flue gas upstream of the two-bin rotary air preheater 1, a flue gas inlet of the tubular air preheater 2 is connected with an outlet flue of the denitration system, an expansion joint 3 is arranged at the flue gas inlet of the tubular air preheater 2, a flue gas outlet of the tubular air preheater 2 is communicated with the flue gas inlet of the two-bin rotary air preheater 1, and a flue gas outlet of the two-bin rotary air preheater 1 is communicated to the dust remover; a primary air inlet of the tubular air preheater 2 is connected with a primary fan 5, a partition plate 7 is arranged in a primary air inlet air channel of the tubular air preheater 2, an adjusting baffle plate 4 is arranged on one side of the partition plate 7, and a primary air outlet of the tubular air preheater 2 is communicated to a hot primary air main pipe; the secondary air inlet of the two-bin rotary air preheater 1 is connected with the blower 6, and the secondary air outlet of the two-bin rotary air preheater 1 is communicated to the secondary air box.
In this embodiment, the tubular air preheater 2 is made of plain carbon steel.
In this embodiment, the wear-resistant sleeve is additionally arranged in a 30cm flue gas inlet of the tubular air preheater 2.
In this embodiment, the axial seal and the circumferential seal of the two-bin rotary air preheater 1 are the same as those of the conventional rotary air preheater, and flexible seal or rigid seal may be used.
The working method comprises the following steps that flue gas led out of a denitration system is cooled through a tubular air preheater 2, the temperature of the flue gas is reduced by 60-80 ℃, then the flue gas enters a two-bin rotary air preheater 1 for cooling, the temperature of the flue gas is reduced by 190-210 ℃, and when the temperature of the flue gas reaches 120-140 ℃, the flue gas is discharged to an electric dust remover, and then is discharged to a chimney after being desulfurized through a draught fan; the cold primary air fed from the outlet of the primary air fan 5 is heated to 220-330 ℃ by the tubular air preheater 2 and then is fed to the hot primary air main pipe, and then the pulverized coal is fed to a hearth for combustion by the pulverizing system; the cold secondary air fed from the blower 6 is heated to 320 ℃ by the two-bin rotary air preheater 1 and then enters the hearth for combustion supporting.
In the method, the flue gas flows through the tubes of the tubular air preheater 2, and the primary air flows through the tubes of the tubular air preheater 2.
The tubular air preheater 2 heats primary air accounting for 25-30% of the total air quantity of the boiler; the two-bin rotary air preheater 1 heats secondary air accounting for 70-75% of the total air volume of the boiler.
The air leakage rate of the tubular air preheater 2 is controlled within 2 percent, and the air leakage rate of the two-bin rotary air preheater 1 is controlled within 2 percent.
The primary air enters the tubular air preheater 2 in two parts, wherein an air duct on one side is provided with an adjusting baffle 4, and the temperature of the hot primary air is controlled by the adjusting baffle 4.
The system can be prepared by modifying the three sub-bins of the conventional rotary air preheater, and the modification method comprises the following steps:
1. transforming the three sub-cabins of the original rotary air preheater into two sub-cabins;
2. reducing the height of a heat exchange element of the rotary air preheater according to the heat transfer calculation result;
3. a tubular air preheater 2 is arranged from the outlet of the denitration system to the inlet flue of the rotary air preheater;
4. primary air is introduced into the inlet of the tubular air preheater 2 and a hot primary air duct is connected to the outlet of the tubular air preheater 2.
The height of the heat transfer element 8 in the two-bin rotary air preheater 1 is reduced by about 1/3 compared with that of the three-bin rotary air preheater, and the air preheater system can be used according to the original operation mode.
Although the present invention has been described with reference to the above embodiments, it should not be construed as being limited to the scope of the present invention, and any modifications made by those skilled in the art without departing from the spirit and scope of the present invention should be construed as being included in the following claims.
Claims (3)
1. The energy-saving anti-blocking system combining the tubular type and the two-bin type rotary air preheater is characterized by comprising a two-bin rotary air preheater (1) for heating secondary air and a tubular air preheater (2) for heating primary air, wherein two groups of sealing plates (9) are respectively arranged at the high-temperature section and the low-temperature section of the two-bin rotary air preheater (1), and heat transfer elements (8) are arranged in the two-bin rotary air preheater (1); the device comprises a tubular air preheater (2), an expansion joint (3) and a dust remover, wherein the tubular air preheater (2) is arranged at the flue gas upstream of a two-bin rotary air preheater (1), the flue gas inlet of the tubular air preheater (2) is connected with an outlet flue of a denitration system, the flue gas inlet of the tubular air preheater (2) is provided with the expansion joint (3), the flue gas outlet of the tubular air preheater (2) is communicated with the flue gas inlet of the two-bin rotary air preheater (1), and the flue gas outlet of the two-bin rotary air preheater (1) is communicated with the dust remover; a primary air inlet of the tubular air preheater (2) is connected with a primary fan (5), a partition plate (7) is arranged in a primary air inlet air channel of the tubular air preheater (2), an adjusting baffle plate (4) is arranged on one side of the partition plate (7), and a primary air outlet of the tubular air preheater (2) is communicated to a hot primary air main pipe; and secondary air inlets of the two-bin rotary air preheater (1) are connected with an air feeder (6), and secondary air outlets of the two-bin rotary air preheater (1) are communicated to a secondary air box.
2. The combined energy-saving and anti-blocking system of the tubular and two-bin rotary air preheater as claimed in claim 1, wherein the tubular air preheater (2) is made of plain carbon steel.
3. The combined energy-saving and anti-blocking system of the tubular and two-bin rotary air preheater as claimed in claim 1, wherein the flue gas inlet of the tubular air preheater (2) is equipped with an anti-wear sleeve within 30 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921122589.7U CN210832077U (en) | 2019-07-17 | 2019-07-17 | Energy-saving anti-blocking system combining pipe type and two-bin type rotary air preheater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921122589.7U CN210832077U (en) | 2019-07-17 | 2019-07-17 | Energy-saving anti-blocking system combining pipe type and two-bin type rotary air preheater |
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| CN210832077U true CN210832077U (en) | 2020-06-23 |
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| CN201921122589.7U Active CN210832077U (en) | 2019-07-17 | 2019-07-17 | Energy-saving anti-blocking system combining pipe type and two-bin type rotary air preheater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110440282A (en) * | 2019-07-17 | 2019-11-12 | 华电电力科学研究院有限公司 | The energy-saving anti-blocking type air preheater system and its working method of tubular type and the combination of two warehouse separated type rotary regenerative air preheaters |
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2019
- 2019-07-17 CN CN201921122589.7U patent/CN210832077U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110440282A (en) * | 2019-07-17 | 2019-11-12 | 华电电力科学研究院有限公司 | The energy-saving anti-blocking type air preheater system and its working method of tubular type and the combination of two warehouse separated type rotary regenerative air preheaters |
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