CN210699404U - Sulfur trioxide removal system applied to high-sulfur high-ash low-temperature flue gas environment - Google Patents
Sulfur trioxide removal system applied to high-sulfur high-ash low-temperature flue gas environment Download PDFInfo
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- CN210699404U CN210699404U CN201921623755.1U CN201921623755U CN210699404U CN 210699404 U CN210699404 U CN 210699404U CN 201921623755 U CN201921623755 U CN 201921623755U CN 210699404 U CN210699404 U CN 210699404U
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Abstract
The utility model discloses a sulfur trioxide desorption system applied to high-sulfur high-ash low-temperature flue gas environment, the low-temperature economizer comprises a high-temperature section low-temperature economizer, a middle-temperature section low-temperature economizer and a low-temperature section low-temperature economizer, an air preheater, the high-temperature section low-temperature economizer, the middle-temperature section low-temperature economizer and the low-temperature section low-temperature economizer are distributed in a tail flue along the flow direction of flue gas in sequence, the inlet of the tail flue is communicated with the flue gas outlet of a boiler, and the outlet of the tail flue is communicated with the inlet of a chimney through an electrostatic dust collector, an induced draft fan and a desulfurizing tower in sequence; the tail flue is vertically distributed, and the flue gas flows from top to bottom in the tail flue; the blade of the induced draft fan is sprayed with an anticorrosive coating; be provided with flue defroster or wet dust collector between desulfurizing tower and the chimney, this system can realize the standard emission of high sulphur high grey low temperature flue gas, and investment cost is low, and security and stability are higher.
Description
Technical Field
The utility model belongs to the technical field of generating set, a be applied to sulfur trioxide desorption system under high sulphur high grey low temperature flue gas environment is related to.
Background
The ultra-low emission technology in the field of thermal power is widely applied, and the dust concentration at the outlet of the 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. Refer to the environmental standard, SO, of developed countries3Is an important index, but the domestic requirement of SO is only in the environmental protection standards of a few areas such as Shanghai, Beijing, Hangzhou and the like3The concentration is not higher than 5mg/m3。SO3Is a direct pollutant for generating acid rain and is an important precursor of haze, SO the national ministry of environmental protection holds a conference to discuss SO3Emission standards and removal techniques.
According to the process flow of coal-fired power plants, S in the coal is combusted to form SO2Part of SO2At high temperature with O2Reaction to form SO3Another part of SO2Catalyzed by fly ash particles, with O2Reverse and forward generation of SO3. After the high-temperature flue gas is subjected to SCR denitration, part of SO2Is catalyzed by a catalyst to form SO3. Most of SO passes through an air preheater and a low-temperature economizer3Condensing into H2SO4Acid mist, captured by fly ash particles. SO trapped by fly ash particles while passing through the dust collector3With the fly ash being removed by the dust separator. When passing through the desulfurizing tower, part of SO3Is removed. After the SCR catalyst, there is about 1～2% SO2Conversion to SO3Air preheater and dust remover pair SO3The removal rate of the desulfurizing tower is about 20 percent, and the desulfurizing tower and the demister are used for SO3The removal rate of (a) was about 70%. Suppose an air preheater inlet SO3The concentration is 50mg/m3Then SO at the inlet of the desulfurizing tower3The concentration is 40mg/m3Chimney inlet SO3The concentration is 12mg/m3And the requirements of the existing standards cannot be met.
The low-temperature economizer can greatly improve the unit to SO3According to actual operation, the air preheater, the low-temperature economizer and the dust remover are used for removing SO3The removal rate of the sulfur-removing agent can reach more than 80 percent, and the SO at the inlet of the desulfurizing tower is added after a low-temperature economizer is arranged3The concentration is 10mg/m3Chimney inlet SO3The concentration is 3mg/m3And the requirements of the existing standards can be met.
The high-sulfur coal (the sulfur content is higher than 3%) in China accounts for about 8% of the total resource amount, a plurality of high-sulfur coal burner units are arranged in the southwest region, the base sulfur content of the fire coal is about 3-6% commonly, and SO in the flue gas3The concentration may be more than 100mg/m3If a low-temperature economizer is additionally arranged, the SO at the inlet of the desulfurizing tower3The concentration is 20mg/m3Chimney inlet SO3The concentration is 6mg/m3And the requirements of the existing standards cannot be met. And the high-sulfur coal-saving machine set has great ash blockage and corrosion risks, and the traditional low-low temperature economizer technology cannot run safely and stably.
Another SO3Removal rate techniqueAdding SO into SCR inlet flue3A removing device for spraying alkaline substance, SO, into the flue3The removal rate of the catalyst can reach more than 80 percent, but the investment is high and the alkaline substances are required to be continuously consumed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a be applied to sulfur trioxide desorption system under high grey low temperature flue gas environment of high sulphur, this system can realize that the standard of high grey low temperature flue gas of high sulphur discharges, and investment cost is low, and security and stability are higher.
In order to achieve the purpose, the sulfur trioxide removal system applied to the high-sulfur high-ash low-temperature flue gas environment comprises a low-temperature economizer, an air preheater, a tail flue, an electrostatic dust collector, an induced draft fan, a desulfurizing tower and a chimney;
the low-temperature economizer comprises a high-temperature section low-temperature economizer, a middle-temperature section low-temperature economizer and a low-temperature section low-temperature economizer, the air preheater, the high-temperature section low-temperature economizer, the middle-temperature section low-temperature economizer and the low-temperature section low-temperature economizer are sequentially distributed in the tail flue along the flow direction of flue gas, the inlet of the tail flue is communicated with the flue gas outlet of the boiler, and the outlet of the tail flue is communicated with the inlet of a chimney through an electrostatic dust collector, an induced draft fan and a desulfurizing tower in sequence;
the tail flue is vertically distributed, and the flue gas flows from top to bottom in the tail flue;
the blade of the induced draft fan is sprayed with an anticorrosive coating;
a flue demister or a wet dust collector is arranged between the desulfurizing tower and the chimney.
The water inlet pipeline is communicated with an inlet of the booster pump and a water inlet of the low-pressure heater, an outlet of the booster pump is communicated with a water inlet of the low-temperature-section low-temperature economizer, a water outlet of the low-temperature-section low-temperature economizer is communicated with a water inlet of the medium-temperature-section low-temperature economizer, a water outlet of the medium-temperature-section low-temperature economizer is communicated with a water inlet of the high-temperature-section low-temperature economizer, and a water outlet of the high-temperature-section low-temperature economizer and a water outlet of the low-pressure heater are communicated with the water outlet pipeline.
The finned tubes of the high-temperature-section low-temperature economizer, the medium-temperature-section low-temperature economizer and the low-temperature-section low-temperature economizer are H finned tubes, the thickness of fins on the finned tubes is more than or equal to 2mm, and the thickness of the tube walls of the finned tubes is more than or equal to 5 mm;
the heat exchange areas of the high-temperature-section low-temperature economizer, the medium-temperature-section low-temperature economizer and the low-temperature-section low-temperature economizer respectively account for 20%, 30% and 50% of the total heat exchange area of the low-temperature-section low-temperature economizer.
The pitch of the heat exchange tubes in the high-temperature-section low-temperature economizer is larger than or equal to 23mm, the pitch of the heat exchange tubes in the medium-temperature-section low-temperature economizer is larger than or equal to 23mm, and the pitch of the heat exchange tubes in the low-temperature-section low-temperature economizer is larger than or equal to 21 mm.
The low-temperature economizer comprises a low-temperature economizer and a supporting beam, wherein the low-temperature economizer is used for fixing the low-temperature economizer in a tail flue.
The low-temperature coal economizer also comprises a sound wave soot blower for performing sound wave soot blowing on the low-temperature coal economizer.
The utility model discloses following beneficial effect has:
be applied to sulfur trioxide desorption system under high-sulfur high grey low temperature flue gas environment when concrete operation, flue gas after air heater cooling again through low temperature economizer cooling to 100 give first place to food with a meal 110 ℃, gaseous state SO in the flue gas3The concentration is reduced to 15mg/m3Left and right, the rest of SO3Conversion to H2SO4Is adsorbed by fly ash and is removed when passing through an electrostatic dust collector, and in addition, a flue demister or a wet dust collector is arranged between the desulfurizing tower and the chimney, thereby realizing the standard emission of high-sulfur high-ash low-temperature flue gas. In addition, the afterbody flue vertical distribution, and the flow direction of flue gas in the afterbody flue is from the top down, and the spraying has the anticorrosive coating on the blade of draught fan to furthest's reduction viscidity deposition's risk, the security and the reliability of system are higher, and investment cost is lower.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
fig. 2 is a schematic structural diagram of the low-temperature and medium-temperature economizer of the present invention.
Wherein, 1 is a boiler, 2 is an air preheater, 3 is a low-temperature economizer, 4 is an electrostatic precipitator, 5 is an induced draft fan, 6 is a desulfurizing tower, 7 is a chimney, 8 is a booster pump, 9 is a low-pressure heater, 10 is a high-temperature section low-temperature economizer, 11 is a middle-temperature section low-temperature economizer, and 12 is a low-temperature section low-temperature economizer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the sulfur trioxide removal system applied to the high-sulfur high-ash low-temperature flue gas environment of the present invention includes a low-temperature economizer 3, an air preheater 2, a tail flue, an electrostatic precipitator 4, an induced draft fan 5, a desulfurizing tower 6 and a chimney 7; the low-temperature economizer 3 comprises a high-temperature section low-temperature economizer 10, a middle-temperature section low-temperature economizer 11 and a low-temperature section low-temperature economizer 12, an air preheater 2, the high-temperature section low-temperature economizer 10, the middle-temperature section low-temperature economizer 11 and the low-temperature section low-temperature economizer 12 are sequentially distributed in a tail flue along the flow direction of flue gas, the inlet of the tail flue is communicated with the flue gas outlet of the boiler 1, and the outlet of the tail flue is communicated with the inlet of a chimney 7 through an electrostatic dust collector 4, an induced draft fan 5 and a desulfurizing tower 6 in sequence; the tail flue is vertically distributed, and the flue gas flows from top to bottom in the tail flue; an anticorrosive coating is sprayed on the blades of the induced draft fan 5; a flue demister or a wet dust collector is arranged between the desulfurizing tower 6 and the chimney 7.
The utility model discloses still include the inlet water pipeline, outlet conduit, booster pump 8 and low pressure feed water heater 9, the inlet water pipeline is linked together with the entry of booster pump 8 and the water inlet of low pressure feed water heater 9, the export of booster pump 8 is linked together with the water inlet of low temperature economizer 12 of low temperature section, the delivery port of low temperature economizer 12 of low temperature section is linked together with the water inlet of low temperature economizer 11 of intermediate temperature section, the delivery port of low temperature economizer 11 of intermediate temperature section is linked together with the water inlet of low temperature economizer 10 of high temperature section, the delivery port of low temperature economizer 10 of high temperature section and the delivery port of low pressure feed water heater 9 are linked together with outlet conduit.
The finned tubes of the high-temperature-section low-temperature economizer 10, the medium-temperature-section low-temperature economizer 11 and the low-temperature-section low-temperature economizer 12 are H finned tubes, the thickness of the fins on the finned tubes is more than or equal to 2mm, and the thickness of the tube walls of the finned tubes is more than or equal to 5 mm; the heat exchange areas of the high-temperature-section low-temperature economizer 10, the medium-temperature-section low-temperature economizer 11 and the low-temperature-section low-temperature economizer 12 respectively account for 20%, 30% and 50% of the total heat exchange area of the low-temperature economizer 3; the pitch of the heat exchange tubes in the high-temperature-section low-temperature economizer 10 is larger than or equal to 23mm, the pitch of the heat exchange tubes in the medium-temperature-section low-temperature economizer 11 is larger than or equal to 23mm, and the pitch of the heat exchange tubes in the low-temperature-section low-temperature economizer 12 is larger than or equal to 21 mm.
The utility model discloses still including being used for carrying out the sound wave soot blower that the sound wave blown the soot to low temperature economizer 3 and being used for being fixed in a supporting beam in the afterbody flue with low temperature economizer 3.
The material of a heat exchange tube of the high-temperature-section low-temperature economizer 10 is 20G, the material of a heat exchange tube of the middle-temperature-section low-temperature economizer 11 is ND steel, and the material of a heat exchange tube of the low-temperature-section low-temperature economizer 12 is 316L; the height-width ratio of the support beam of the low-temperature economizer 3 is more than 5; the low-temperature coal economizer 3 adopts a sound wave soot blower, and the soot blowing radius is arranged according to 1 meter; the polar plate polar line of the first electric field of the electrostatic dust collector 4 is made of carbon steel, the polar line after the second electric field is made of 316L, and the polar plate is made of carbon steel; the material of an ash bucket of the electrostatic dust collector 4 is 316L, and the ash bucket is heated by a steam coil pipe, and the temperature is controlled to be above 80 ℃; blades of the draught fan 5 are subjected to thermal spraying corrosion prevention, and the hub and the shell are subjected to ND steel lining corrosion prevention; the desulfurizing tower 6 is provided with a layer of trays.
The utility model discloses a concrete working process does:
the temperature of the flue gas cooled by the air preheater 2 is reduced to below the acid dew point by the low-temperature economizer 3, and when the temperature is about 100-3The concentration is reduced to 15mg/m3Left and right, the rest of SO3Conversion to H2SO4Adsorbed by fly ash and removed by the electrostatic dust collector 4, and because the low-temperature coal economizer 3 has serious ash blocking and corrosion risks in the high-sulfur high-ash smoke environment, a series of optimization needs to be carried out on the structure of the low-temperature coal economizer 3The safe and stable operation can be ensured, the polar plate polar wire of the electrostatic dust collector 4 and the blades, the hub and the shell of the draught fan 5 also have corrosion risks, the corrosion prevention treatment is required, and a layer of tray and a flue demister or a wet dust collector are arranged in the high-efficiency desulfurizing tower 6 to ensure that the residual gaseous SO is removed3Removing to 5mg/m3The method meets the future standard requirements, realizes the safe, stable and long-period operation of the whole-flow equipment, and thus improves the safety, stability and economy of the whole unit.
In addition, the high-temperature section low-temperature economizer 10, the medium-temperature section low-temperature economizer 11 and the low-temperature section low-temperature economizer 12 are made of different materials, so that the manufacturing cost of equipment is reduced to the maximum extent on the premise of ensuring that the low-temperature corrosion of the heat exchanger is controllable.
Claims (6)
1. A sulfur trioxide removal system applied to a high-sulfur high-ash low-temperature flue gas environment is characterized by comprising a low-temperature economizer (3), an air preheater (2), a tail flue, an electrostatic dust collector (4), an induced draft fan (5), a desulfurizing tower (6) and a chimney (7);
the low-temperature economizer (3) comprises a high-temperature section low-temperature economizer (10), a middle-temperature section low-temperature economizer (11) and a low-temperature section low-temperature economizer (12), an air preheater (2), the high-temperature section low-temperature economizer (10), the middle-temperature section low-temperature economizer (11) and the low-temperature section low-temperature economizer (12) are sequentially distributed in a tail flue along the flow direction of flue gas, the inlet of the tail flue is communicated with the flue gas outlet of the boiler (1), and the outlet of the tail flue is sequentially communicated with the inlet of a chimney (7) through an electrostatic dust collector (4), an induced draft fan (5) and a desulfurizing tower (6);
the tail flue is vertically distributed, and the flue gas flows from top to bottom in the tail flue;
an anticorrosive coating is sprayed on the blade of the induced draft fan (5);
a flue demister or a wet dust collector is arranged between the desulfurizing tower (6) and the chimney (7).
2. The sulfur trioxide removal system applied to the environment with high sulfur, high ash and low temperature flue gas of claim 1, further comprising a water inlet pipeline, a water outlet pipeline, a booster pump (8) and a low pressure heater (9), wherein the water inlet pipeline is communicated with an inlet of the booster pump (8) and a water inlet of the low pressure heater (9), an outlet of the booster pump (8) is communicated with a water inlet of the low temperature section low temperature economizer (12), a water outlet of the low temperature section low temperature economizer (12) is communicated with a water inlet of the medium temperature section low temperature economizer (11), a water outlet of the medium temperature section low temperature economizer (11) is communicated with a water inlet of the high temperature section low temperature economizer (10), and a water outlet of the high temperature section low temperature economizer (10) and a water outlet of the low pressure heater (9) are communicated with the water outlet pipeline.
3. The sulfur trioxide removal system applied to the high-sulfur high-ash low-temperature flue gas environment as recited in claim 1, wherein the finned tubes of the high-temperature section low-temperature economizer (10), the medium-temperature section low-temperature economizer (11) and the low-temperature section low-temperature economizer (12) are H-finned tubes, the thickness of the fins on the finned tubes is greater than or equal to 2mm, and the thickness of the finned tubes is greater than or equal to 5 mm;
the heat exchange areas of the high-temperature section low-temperature economizer (10), the medium-temperature section low-temperature economizer (11) and the low-temperature section low-temperature economizer (12) respectively account for 20%, 30% and 50% of the total heat exchange area of the low-temperature economizer (3).
4. The sulfur trioxide removal system applied to the environment with high sulfur content, high ash content and low temperature flue gas as recited in claim 1, characterized in that the pitch of the heat exchange tubes in the high temperature section low-temperature economizer (10) is greater than or equal to 23mm, the pitch of the heat exchange tubes in the medium temperature section low-temperature economizer (11) is greater than or equal to 23mm, and the pitch of the heat exchange tubes in the low temperature section low-temperature economizer (12) is greater than or equal to 21 mm.
5. The sulfur trioxide removal system applied in high sulfur, high ash and low temperature flue gas environment of claim 1, further comprising a support beam for fixing the low temperature economizer (3) in the tail flue.
6. The sulfur trioxide removal system applied in a high sulfur, high ash and low temperature flue gas environment as claimed in claim 1, further comprising an acoustic soot blower for acoustic soot blowing of the low temperature economizer (3).
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| CN201921623755.1U CN210699404U (en) | 2019-09-26 | 2019-09-26 | Sulfur trioxide removal system applied to high-sulfur high-ash low-temperature flue gas environment |
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| CN201921623755.1U CN210699404U (en) | 2019-09-26 | 2019-09-26 | Sulfur trioxide removal system applied to high-sulfur high-ash low-temperature flue gas environment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110508091A (en) * | 2019-09-26 | 2019-11-29 | 西安西热锅炉环保工程有限公司 | A kind of sulfur trioxide under the high ash low-temperature flue gas environment applied to high-sulfur removes system |
| WO2023050699A1 (en) * | 2021-09-28 | 2023-04-06 | 中国华能集团清洁能源技术研究院有限公司 | Low-temperature desulfurization and denitrification method and system for flue gas from biomass power plant |
-
2019
- 2019-09-26 CN CN201921623755.1U patent/CN210699404U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110508091A (en) * | 2019-09-26 | 2019-11-29 | 西安西热锅炉环保工程有限公司 | A kind of sulfur trioxide under the high ash low-temperature flue gas environment applied to high-sulfur removes system |
| WO2023050699A1 (en) * | 2021-09-28 | 2023-04-06 | 中国华能集团清洁能源技术研究院有限公司 | Low-temperature desulfurization and denitrification method and system for flue gas from biomass power plant |
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