CN204786491U - Boiler smoke waste -heat application system - Google Patents

Boiler smoke waste -heat application system Download PDF

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Publication number
CN204786491U
CN204786491U CN201520514599.0U CN201520514599U CN204786491U CN 204786491 U CN204786491 U CN 204786491U CN 201520514599 U CN201520514599 U CN 201520514599U CN 204786491 U CN204786491 U CN 204786491U
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China
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flue
flue gas
temperature
boiler
outlet
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CN201520514599.0U
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Chinese (zh)
Inventor
蒋洁
李仁刚
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南京龙源环保有限公司
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/30Technologies for a more efficient combustion or heat usage

Abstract

The utility model provides a boiler smoke waste -heat application system, includes cryogenic heat exchanger, flue gas reheating ware, dust remover and fan, cryogenic heat exchanger connects on the flue after the air heater of boiler, exhanst gas outlet at boiler flue gas desulphurization device's desulfurizing tower connects gradually dust remover and flue gas reheating ware, be connected with the tuber pipe between cryogenic heat exchanger and flue gas reheating ware, on the fan installation tuber pipe, the series connection of high temperature heat exchanger is provided with the high temperature flue gas fairlead that is connected to the evaporating column on installing the flue between cryogenic heat exchanger and boiler on the flue between economizer and air heater, the flue gas inlet of desulfurizing tower is connected to the outlet flue of evaporating column, the sour dew point temperature of flue gas reduces to below 80 DEG C after the desulfurization of the messenger of this system, makes the flue -gas temperature rise between 80-90 DEG C, the dewfall corrosion in the chimney no longer appears, can also appear partial desulfurization liquid evaporation with solid matter wherein, the zero release of desulfurization waste water has been realized in returning desulfurization system to the vapor of formation.

Description

A kind of residual heat from boiler fume utilizes system
Technical field:
The utility model relates to a kind of residual heat from boiler fume and utilizes system.
Background technology:
Country attaches great importance to energy-saving and emission-reduction work in recent years, therefore in power industry, how effectively to utilize the waste heat of boiler smoke to become study hotspot.But because boiler tail flue gas has the existence of sulfur trioxide, especially coal-burning boiler, even if boiler smoke is after desulfurization process, still containing certain density sulfur trioxide in its flue gas, flue-gas temperature after boiler smoke wet desulphurization is generally at about 50 DEG C, lower than acid dew-point temperature, sulfur trioxide in flue gas and water react and generate sulfuric acid, serious dewing corrosion phenomenon is produced in chimney, for reducing the dewing corrosion phenomenon in flue dust as far as possible, need raising boiler generally all to control between 140 ~ 160 DEG C to the exhaust gas temperature of chimney, cause the waste of the energy.
Containing the sediment such as a large amount of dust and desulfurization product in desulfurization wastewater, doctor solution, for recycling, for reducing the sediment in doctor solution, needing partial desulfurization liquid to draw to process as desulfurization wastewater, adding fresh doctor solution simultaneously to doctor solution; Owing to also comprising the heavy metals such as mercury, arsenic and chromium in desulfurization wastewater, adopt the waste water after neutralization, flocculation and the chemical method process such as precipitation still can not qualified discharge well, the waste water of process cannot enter system reuse, and the processing cost of desulfurization wastewater is higher, the burden of enterprise is larger, how to process desulfurization wastewater at low cost, become the problem of the previous outbalance of enterprise's order.
Utility model content:
The purpose of this utility model is to provide the significant residual heat from boiler fume of a kind of energy-saving effect to utilize system, this system can while raising wet-method desulfurized fume temperature, and the acid dew-point temperature of flue gas after desulfurization can be reduced, thus reduce or cancel the energy consumption improved required for flue gas after desulfurization temperature; Another object of the present utility model reduces the cost of process desulfurization wastewater.
To achieve these goals, the utility model adopts following technical scheme:
A kind of residual heat from boiler fume utilizes system, and it is for boiler flue gas desulfurization device, comprises cryogenic heat exchanger, flue gas reheater, deduster and blower fan; Wherein, cryogenic heat exchanger is provided with the first gas approach, the first exhanst gas outlet, the first air inlet and the first air outlet; Flue gas reheater is provided with the second gas approach, the second exhanst gas outlet, the second air inlet and the second air outlet; Cryogenic heat exchanger is connected on the flue after the air preheater of boiler; Deduster and flue gas reheater is connected successively at the exhanst gas outlet of the desulfurizing tower of boiler flue gas desulfurization device; Be connected with low temperature blast pipe between first air inlet with the second air outlet, be connected with high temperature backwind tube between the first air outlet with the second air inlet; Assembling is on low temperature blast pipe or high temperature backwind tube.
Further, deduster is preferably wet electrical dust precipitator.
The utility model operationally, air after heating in cryogenic heat exchanger is sent in the flue gas reheater after deduster by blower fan, flue gas after desulfurization is heated, because the flue gas after desulfurization is significantly reducing the moisture contained after deduster, the content of sulfur trioxide in flue gas is also synchronously reduced significantly, and therefore the acid dew-point temperature of flue gas is efficiently reduced to less than 80 DEG C; Flue gas is heated between 80 ~ 90 DEG C in flue gas reheater, the dewing corrosion phenomenon in chimney is declined significantly and even no longer occurs.
Compare in prior art, need to utilize other heat energy to rise between 140 ~ 160 DEG C by the flue gas after desulfurization by about 50 DEG C, the temperature of flue gas just can be made higher than acid dew-point temperature, the utility model utilize flue gas before desulfurization self heat energy to add the flue gas after thermally desulfurizing, no longer need additionally to provide heat energy to heat flue gas after desulfurization, there is the huge advantage of economize energy.
Simultaneously because flue gas is after cryogenic heat exchanger heat exchange, its temperature is lowered, and volume-diminished enhances desulfurized effect, create a further reduction the concentration of the sulfur trioxide in flue gas, effectively ensure that in chimney and no longer occurs dewing corrosion phenomenon.
This residual heat from boiler fume utilizes system also to comprise high-temperature heat-exchanging, evaporating column and heat exchange pump; High-temperature heat-exchanging is provided with the 3rd gas approach, the 3rd exhanst gas outlet, inlet and liquid outlet; Evaporating column is provided with into mouth, mouth spray, outlet flue and ash discharging hole; On the flue that high-temperature heat-exchanging is installed in series between cryogenic heat exchanger and air preheater, wherein the 3rd gas approach is connected on the flue of boiler, and the 3rd exhanst gas outlet is connected with the first gas approach; The inlet of high-temperature heat-exchanging connects heat exchange delivery side of pump, and liquid outlet connects the mouth spray of evaporating column; Flue between the economizer and air preheater of boiler is provided with high-temperature flue gas fairlead, and what high-temperature flue gas fairlead was connected to evaporating column enters mouth; The outlet flue of evaporating column connects the gas approach of desulfurizing tower.
Further, cryogenic heat exchanger and high-temperature heat-exchanging are set to integral structure.
The utility model operationally, partial desulfurization liquid is sprayed into evaporating column by heat exchange pump after high-temperature heat-exchanging heating, a certain amount of high-temperature flue gas is sent into evaporating column by high-temperature flue gas fairlead simultaneously, in evaporating column, doctor solution evaporates rapidly under the effect of high-temperature flue gas, the gas approach that moisture after evaporation and flue gas together enter into desulfurizing tower carries out desulfurization, discharges after the dust of separating out after doctor solution evaporation falls into the lower end of evaporating column through ash discharging hole.
Adopt the utility model, while being separated out by the solid matter in doctor solution, moisture in doctor solution forms steam, and then steam reenters in desulfurizer through the gas approach of desulfurizing tower and recycles, and reaches the effect of desulfurization wastewater zero-emission.
Accompanying drawing illustrates:
Fig. 1 is the structure diagram of embodiment of the present utility model.
Mark in figure:
2-economizer, 3-air preheater, 5-high-temperature heat-exchanging, 6-cryogenic heat exchanger, 7-evaporating column, 8-desulfurizing tower, 9-deduster, 10-flue gas reheater, 11-chimney, 21-high-temperature flue gas fairlead, 52-desulfurization liquid pool, 55-heat exchange pump, 62-blower fan, 64-low temperature blast pipe, 65-high temperature backwind tube.
Detailed description of the invention:
Embodiment 1:
Consult Fig. 1, a kind of residual heat from boiler fume utilizes system, and it is for boiler flue gas desulfurization device, comprises cryogenic heat exchanger 6, flue gas reheater 10, deduster 9 and blower fan 62; Wherein, cryogenic heat exchanger 6 is provided with the first gas approach, the first exhanst gas outlet, the first air inlet and the first air outlet; Flue gas reheater 10 is provided with the second gas approach, the second exhanst gas outlet, the second air inlet and the second air outlet; Cryogenic heat exchanger 6 is connected on the flue after the air preheater 3 of boiler; Deduster 9 and flue gas reheater 10 is connected successively at the exhanst gas outlet of the desulfurizing tower 8 of boiler flue gas desulfurization device; Be connected with low temperature blast pipe 64 between first air inlet with the second air outlet, be connected with high temperature backwind tube 65 between the first air outlet with the second air inlet; Blower fan 62 is arranged on high temperature backwind tube 65.
Certain blower fan 62 also can be arranged on low temperature blast pipe 64.
For making deduster have the good function removing moisture, deduster 9 preferably adopts wet electrical dust precipitator.
The utility model operationally, air after heating in cryogenic heat exchanger 6 is sent in the flue gas reheater 10 after deduster 9 by blower fan 62, flue gas after desulfurization is heated, because the flue gas after desulfurization is significantly reducing the moisture contained after deduster, the content of sulfur trioxide in flue gas is also synchronously reduced significantly, and therefore the acid dew-point temperature of flue gas is efficiently reduced to less than 80 DEG C; Flue gas is heated between 80 ~ 90 DEG C in flue gas reheater 10, the dewing corrosion phenomenon in chimney 11 is declined significantly and even no longer occurs.
Compare in prior art, need to utilize other heat energy to rise between 140 ~ 160 DEG C by the flue gas after desulfurization by about 50 DEG C, the temperature of flue gas just can be made higher than acid dew-point temperature, the utility model utilize flue gas before desulfurization self heat energy to add the flue gas after thermally desulfurizing, no longer need additionally to provide heat energy to heat flue gas after desulfurization, there is the huge advantage of economize energy.
This residual heat from boiler fume utilizes system also to comprise high-temperature heat-exchanging 5, evaporating column 7 and heat exchange pump 55; High-temperature heat-exchanging 5 is provided with the 3rd gas approach, the 3rd exhanst gas outlet, inlet and liquid outlet; Evaporating column 7 is provided with into mouth, mouth spray, outlet flue and ash discharging hole; On the flue that high-temperature heat-exchanging 5 is installed in series between cryogenic heat exchanger 6 and air preheater 3, wherein the 3rd gas approach is connected on the flue of boiler, and the 3rd exhanst gas outlet is connected with the first gas approach; The inlet of high-temperature heat-exchanging 5 connects the outlet of heat exchange pump 55, and liquid outlet connects the mouth spray of evaporating column 7; Flue between the economizer 2 and air preheater 3 of boiler is provided with high-temperature flue gas fairlead 21, and what high-temperature flue gas fairlead 21 was connected to evaporating column 7 enters mouth; The outlet flue of evaporating column 7 connects the gas approach of desulfurizing tower 8.
For reducing manufacturing cost, convenient installation, can be designed to integral structure by cryogenic heat exchanger 6 and high-temperature heat-exchanging 5 simultaneously.
The utility model operationally, partial desulfurization liquid is sprayed into evaporating column 7 by heat exchange pump 55 after high-temperature heat-exchanging 5 heats, a certain amount of high-temperature flue gas is sent into evaporating column 7 by high-temperature flue gas fairlead 21 simultaneously, in evaporating column 7, doctor solution evaporates rapidly under the effect of high-temperature flue gas, the gas approach that moisture after evaporation and flue gas together enter into desulfurizing tower 8 carries out desulfurization, discharges after the dust of separating out after doctor solution evaporation falls into the lower end of evaporating column 7 through ash discharging hole.
Adopt the utility model, while being separated out by the solid matter in doctor solution, moisture in doctor solution forms steam, and then steam reenters in desulfurizer through the gas approach of desulfurizing tower and recycles, and reaches the effect of desulfurization wastewater zero-emission.

Claims (4)

1. residual heat from boiler fume utilizes a system, and it is for boiler flue gas desulfurization device, and feature is: comprise cryogenic heat exchanger, flue gas reheater, deduster and blower fan; Wherein,
Cryogenic heat exchanger is provided with the first gas approach, the first exhanst gas outlet, the first air inlet and the first air outlet;
Flue gas reheater is provided with the second gas approach, the second exhanst gas outlet, the second air inlet and the second air outlet;
Cryogenic heat exchanger is connected on the flue after the air preheater of boiler;
Deduster and flue gas reheater is connected successively at the exhanst gas outlet of the desulfurizing tower of boiler flue gas desulfurization device;
Be connected with low temperature blast pipe between first air inlet with the second air outlet, be connected with high temperature backwind tube between the first air outlet with the second air inlet;
Assembling is on low temperature blast pipe or high temperature backwind tube.
2. residual heat from boiler fume according to claim 1 utilizes system, it is characterized in that: described deduster is wet electrical dust precipitator.
3. residual heat from boiler fume according to claim 1 utilizes system, it is characterized in that: also comprise high-temperature heat-exchanging, evaporating column and heat exchange pump;
High-temperature heat-exchanging is provided with the 3rd gas approach, the 3rd exhanst gas outlet, inlet and liquid outlet;
Evaporating column is provided with into mouth, mouth spray, outlet flue and ash discharging hole;
On the flue that high-temperature heat-exchanging is installed in series between cryogenic heat exchanger and air preheater, wherein the 3rd gas approach is connected on the flue of boiler, and the 3rd exhanst gas outlet is connected with the first gas approach; The inlet of high-temperature heat-exchanging connects heat exchange delivery side of pump, and liquid outlet connects the mouth spray of evaporating column;
Flue between the economizer and air preheater of boiler is provided with high-temperature flue gas fairlead, and what high-temperature flue gas fairlead was connected to evaporating column enters mouth; The outlet flue of evaporating column connects the gas approach of desulfurizing tower.
4. residual heat from boiler fume according to claim 3 utilizes system, it is characterized in that: above-mentioned cryogenic heat exchanger and high-temperature heat-exchanging are integral type structure.
CN201520514599.0U 2015-07-15 2015-07-15 Boiler smoke waste -heat application system CN204786491U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106225522A (en) * 2016-07-20 2016-12-14 杭州佰强能源科技有限公司 A kind of flue gas and flue gas heat-exchange unit and heat-exchange system
CN106365232A (en) * 2016-11-15 2017-02-01 青岛达能环保设备股份有限公司 Low-temperature sprinkling and evaporation treatment method for desulfurization waste water
CN107321181A (en) * 2017-08-27 2017-11-07 佛山市亚科恒远科技有限公司 A kind of flue gas processing device
CN107349785A (en) * 2017-08-27 2017-11-17 佛山市亚科恒远科技有限公司 A kind of Multifunctional tobacco gas processing system
CN108619871A (en) * 2017-03-23 2018-10-09 中国石油化工股份有限公司 A kind of processing method and processing device of flue gas and flue gas desulfurization waste-water

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106225522A (en) * 2016-07-20 2016-12-14 杭州佰强能源科技有限公司 A kind of flue gas and flue gas heat-exchange unit and heat-exchange system
CN106365232A (en) * 2016-11-15 2017-02-01 青岛达能环保设备股份有限公司 Low-temperature sprinkling and evaporation treatment method for desulfurization waste water
CN108619871A (en) * 2017-03-23 2018-10-09 中国石油化工股份有限公司 A kind of processing method and processing device of flue gas and flue gas desulfurization waste-water
CN108619871B (en) * 2017-03-23 2020-09-11 中国石油化工股份有限公司 Method and device for treating flue gas and flue gas desulfurization wastewater
CN107321181A (en) * 2017-08-27 2017-11-07 佛山市亚科恒远科技有限公司 A kind of flue gas processing device
CN107349785A (en) * 2017-08-27 2017-11-17 佛山市亚科恒远科技有限公司 A kind of Multifunctional tobacco gas processing system

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