CN212440687U - Desulfurizing and dust-removing device for gas boiler - Google Patents
Desulfurizing and dust-removing device for gas boiler Download PDFInfo
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- CN212440687U CN212440687U CN202020163677.8U CN202020163677U CN212440687U CN 212440687 U CN212440687 U CN 212440687U CN 202020163677 U CN202020163677 U CN 202020163677U CN 212440687 U CN212440687 U CN 212440687U
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Abstract
The utility model discloses a gas boiler's desulfurization dust collector, include: a transport bed reactor, a feeder for feeding the calcium-based absorbent into the transport bed reactor, a fluidized bed reactor communicating with a discharge port of the transport bed reactor, toAnd a dust remover communicated with the discharge port of the fluidized bed reactor. The utility model discloses a gas boiler's desulfurization dust collector carries out the desulfurization through adopting two reactors of transport bed reactor and fluidized bed reactor, has realized the two-stage absorption desulfurization promptly, has prolonged the dwell time of absorbent, has improved SOxThe absorption and removal efficiency is improved, and the consumption of the absorbent is reduced, so that the cost is effectively reduced. Meanwhile, the calcium-based absorbent is adopted, so that moisture absorption is not easy, and the requirement on a feeder is lowered; moreover, the pH of the desulfurization by-products is reduced, thereby reducing the cost of disposal.
Description
Technical Field
The utility model relates to a gas boiler flue gas handles technical field, and more specifically says, relates to a gas boiler's desulfurization dust collector.
Background
The gas boiler uses natural gas, city gas and the like as fuels, adopts mixed combustion mostly, the components of the flue gas after combustion are complex, and the main pollutant is NOx、SOXAnd dust, etc., SOXThe concentration is generally 100-200 mg/m3The concentration of smoke dust is generally not more than 20mg/m3. The emission standard of the atmospheric pollutants of the thermal power plant stipulates the emission requirements of the atmospheric pollutants of the gas-fired boiler: SO (SO)2Controlled at 35mg/m3The soot of the natural gas boiler and the gas turbine unit is controlled to be 5mg/m3The soot of other gas fuel boilers and gas turbine units was controlled to 10mg/m3The following.
At present, the prior patent discloses a desulfurization and dust removal integrated device of a gas furnace, which adopts NaHCO3And as an absorbent, the absorbent is sprayed into a flue by using an absorbent spraying system for desulfurization, and then a bag-type dust remover is matched for dust removal. Wherein, the flue is used as a reactor for desulfurization, i.e. desulfurizationThe sulfur reaction is carried out in a rapid reaction bed or a pneumatic transmission state, the retention time of the absorbent is short, the absorption efficiency is low, the required sodium-sulfur ratio is high, the consumption of the absorbent is high, and the cost is high.
In addition, the sodium bicarbonate fine powder is easy to absorb moisture, and the absorbent is directly sprayed into the flue after being ground on site by the grinder, SO that extremely high technical requirements are put on grinding equipment and an injection system, because the sodium bicarbonate can absorb water and agglomerate even if slight air leakage occurs, the grinder and the injection system are blocked and paralyzed, normal and stable operation cannot be ensured, and SO in the flue gas is influenced2And (4) removing.
In addition, the temperature of the flue gas discharged by the gas boiler is higher, the chemical life of the filter material of the bag-type dust collector is inversely proportional to the temperature of the flue gas, and the higher the temperature is, the shorter the chemical life of the filter material is. If the filter material is prevented from being burnt out due to over-temperature by adopting water spraying and temperature reduction, sodium carbonate hardening is easy to occur on the sodium bicarbonate fine powder, so that the absorption tower is agglomerated and the ash bucket is blocked.
In addition, the ash sample of the desulfurization by-product has strong water solubility, higher pH value and higher treatment cost.
In summary, how to desulfurize and dedust the flue gas discharged from the gas boiler to reduce the cost is a problem to be solved urgently by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a gas boiler's desulfurization dust collector to reduce cost.
In order to achieve the above object, the present invention provides the following technical solutions:
a desulfurization dust removing apparatus of a gas boiler, comprising: the device comprises a conveying bed reactor, a feeder for adding a calcium-based absorbent into the conveying bed reactor, a fluidized bed reactor communicated with a discharge port of the conveying bed reactor, and a dust remover communicated with the discharge port of the fluidized bed reactor.
Preferably, the transport bed reactor is in communication with the fluidized bed reactor via a venturi acceleration device.
Preferably, the desulfurization dust removing apparatus of a gas boiler further comprises: an injector for injecting atomized water into the fluidized bed reactor.
Preferably, a calcium-based absorbent is placed in the dust remover;
the desulfurization and dust removal device of the gas boiler further comprises a circulating conveying device, and the circulating conveying device is communicated with a byproduct circulating port of the bag-type dust remover and the conveying bed reactor.
Preferably, the desulfurization dust removing apparatus of a gas boiler further comprises:
a discharge duct communicating with an exhaust port of the dust collector;
a load adjusting pipeline communicating the inlet of the transport bed reactor with the exhaust pipeline;
wherein, the last draught fan that has concatenated of discharge line, the load control pipeline with discharge line's intercommunication position is located the low reaches of draught fan.
Preferably, the desulfurization dust removing apparatus of a gas boiler further comprises:
the absorbent bin is used for storing the calcium-based absorbent and is communicated with the feeder;
and the byproduct storage bin is communicated with the product discharge port of the dust remover.
The utility model provides a gas boiler's desulfurization dust collector carries out the desulfurization through adopting two reactors of transport bed reactor and fluidized bed reactor, has realized the two-stage absorption desulfurization promptly, has prolonged the dwell time of absorbent, has improved SOxThe absorption and removal efficiency is improved, and the consumption of the absorbent is reduced, so that the cost is effectively reduced.
Meanwhile, the desulfurization and dust removal device of the gas boiler adopts the calcium-based absorbent, so that moisture is not easy to absorb, and the requirement on a feeder is reduced; moreover, the pH of the desulfurization by-products is reduced, thereby reducing the cost of disposal.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a block diagram of a desulfurization and dust removal device of a gas boiler provided by an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, the embodiment of the present invention provides a desulfurization dust-removing device for a gas boiler, including: feeders, transport bed reactors, fluidized bed reactors, and dust collectors. The feeder is used for adding the calcium-based absorbent into the conveying bed reactor, the fluidized bed reactor is communicated with a discharge port of the conveying bed reactor, and the dust remover is communicated with a discharge port of the fluidized bed reactor.
The embodiment of the utility model provides a gas boiler's desulfurization dust collector carries out the desulfurization through adopting two reactors of transport bed reactor and fluidized bed reactor, has realized the two-stage absorption desulfurization promptly, has prolonged the dwell time of absorbent, has improved SOxThe absorption and removal efficiency is improved, and the consumption of the absorbent is reduced, so that the cost is effectively reduced.
Meanwhile, the desulfurization and dust removal device of the gas boiler provided by the embodiment of the utility model adopts the calcium-based absorbent, so that moisture absorption is not easy, and the requirement on a feeder is reduced; moreover, the pH of the desulfurization by-products is reduced, thereby reducing the cost of disposal.
The temperature of the flue gas discharged by the gas boiler is between 120 and 180 ℃, and the flue gas discharged by the gas boiler enters a conveying bed reactor and a feeder through a flueAnd adding the calcium-based absorbent into the conveying bed reactor. In particular, according to SO in flue gasXThe amount of the added concentration-adjusting absorbent. Preferably, the molar ratio of calcium in the calcium-based absorbent added by the feeder to sulfur in the flue gas entering the transport bed reactor is between 1.1 and 1.4. Absorption of SO primarily in transport bed reactor3Almost all of SO3And (4) completely absorbing.
The main reaction in the transport bed reactor is as follows:
Ca(OH)2+SO3＝CaSO4·1/2H2O+1/2H2O，
Ca(OH)2+SO2＝CaSO3·1/2H2O+1/2H2O。
in order to accelerate the materials and the flue gas to enter the fluidized bed reactor, the conveying bed reactor is communicated with the fluidized bed reactor through a Venturi accelerating device.
A large amount of calcium-based absorbent in the conveying bed reactor is not completely reacted, and a large amount of calcium-based absorbent which is not completely reacted is conveyed into the fluidized bed reactor, mixed with the flue gas in a violent turbulent manner and fully contacted to form a violent turbulent material bed layer with a large specific surface, so that the mass transfer and heat transfer between gas and solid are enhanced. Further absorbing SO in the flue gas in a fluidized bed reactorXIs mainly SO2. In order to improve the absorption effect, the molar ratio of calcium to sulfur in the fluidized bed reactor is not less than 60.
The main reaction in a fluidized bed reactor is as follows:
Ca(OH)2+SO2＝CaSO3·1/2H2O+1/2H2O，
Ca(OH)2+SO3＝CaSO4·1/2H2O+1/2H2O，
CaSO3·1/2H2O+1/2O2＝CaSO4·1/2H2O。
in order to further optimize the technical scheme, the desulfurization and dust removal device of the gas boiler further comprises an ejector, and the ejector is used for ejecting atomized water into the fluidized bed reactor. The temperature reduction is realized by atomized water sprayed by the sprayer, and preferably, the temperature of the flue gas in the fluidized bed reactor is between 80 and 100 ℃. Meanwhile, the atomized water sprayed by the sprayer ensures that the ultrafine particle dust entering the fluidized bed reactor is always in a humidifying, aggregating and condensing environment under the regulation and control of the atomized water, and the ultrafine particle dust in the flue gas is aggregated and condensed and increased into coarser particles, so that the dust is more favorably removed by a subsequent dust remover. In order to improve the dust removing effect, the grain diameter of the atomized water is preferably selected to be between 50um and 100 um.
Of course, the temperature in the fluidized bed reactor, the particle size of the atomized water, and the molar ratio of calcium to sulfur in the fluidized bed reactor can be selected to other values, and are not limited to the above examples.
In the desulfurization and dust removal device for the gas boiler provided by the embodiment, atomized water is sprayed to the fluidized bed reactor through the sprayer, so that a turbulent environment with high-efficiency mass transfer and heat transfer can be realized, coagulation of ultrafine dust is facilitated, dust particles are increased, and the ultrafine dust in flue gas is efficiently removed; the filter material of the dust remover can be prevented from being burnt due to high temperature by humidifying and cooling by spraying atomized water, so that the dust removing effect is improved.
The material and the flue gas discharged from the fluidized bed reactor directly enter a dust remover. The flue gas is discharged after being purified by a dust remover. Preferably, a calcium-based absorbent is placed in the dust remover, SO that the SO in the flue gas is further absorbed and removed while the dust in the flue gas is removedxEffectively improving the desulfurization effect. The calcium-based absorbent forms by-products after the reaction and the calcium-based absorbent which is not completely reacted is discharged.
In the dust separator, a large amount of unreacted absorbent is present. In order to further reduce the consumption of the absorbent, the desulfurization and dust removal device of the gas boiler further comprises a circulating conveying device, and the circulating conveying device is communicated with a byproduct circulating port of the bag-type dust remover and the conveying bed reactor. Thus, a part of unreacted absorbent and byproducts are discharged from a byproduct circulating port of the dust remover and are returned to the conveying bed reactor through the circulating conveying device for recycling; and discharging the other part of the absorbent and the byproducts.
In the practical application process, most of the unreacted absorbent and the byproducts are returned to the conveying bed reactor, and a small part of the unreacted absorbent and the byproducts are discharged outside.
The type of the circulating conveying device is selected according to actual needs. In order to simplify the structure and facilitate the conveying, the circulating conveying device is preferably an air chute.
Specifically, the position of the feeder communicated with the conveying bed reactor is positioned at the front end of the conveying bed reactor; the position of the circulating conveying device communicated with the conveying bed reactor is positioned in the middle of the conveying bed reactor.
Preferably, the desulfurization dust removing apparatus for a gas boiler further comprises: and the discharge pipeline is communicated with an exhaust port of the dust remover, and an induced draft fan is connected on the discharge pipeline in series. Therefore, the purified flue gas can be led out through the induced draft fan and led to the chimney.
The load fluctuation range of the gas boiler is about 50-110%, and in order to ensure that the conveying bed reactor and the fluidized bed reactor have good adaptability under various working conditions, the desulfurization and dust removal device of the gas boiler further comprises a load adjusting pipeline, and the load adjusting pipeline is communicated with an inlet and an exhaust pipeline of the conveying bed reactor; wherein, the communicating position of the load adjusting pipeline and the discharge pipeline is positioned at the downstream of the induced draft fan.
Specifically, when the load of the gas-fired boiler is small, the flue gas can be introduced to the conveying bed reactor through the load adjusting pipeline, and the stable operation of the conveying bed reactor and the fluidized bed reactor under the low-load working condition is ensured. For example, the flow speed of flue gas in the conveying bed reactor is not lower than 18m/s under different working condition loads, and the stable operation of the system is ensured.
In order to supply the absorbent conveniently, the desulfurization and dust removal device of the gas boiler further comprises an absorbent bin for storing the calcium-based absorbent, and the absorbent bin is communicated with the feeder.
In order to store the byproducts, the desulfurization and dust removal device of the gas boiler also comprises a byproduct storage bin communicated with the product discharge port of the dust remover. It can be understood that, when the desulfurization and dust removal device of the gas boiler comprises a circulating conveyor, a part of the unreacted absorbent and the by-products are discharged from the by-product circulating port of the dust remover and returned to the conveying bed reactor through the circulating conveyor for recycling; and discharging the other part of the absorbent and the byproduct to a byproduct storage bin.
The calcium-based absorbent is calcium carbonate, calcium hydroxide or calcium oxide. Preferably, the calcium based absorbent is calcium hydroxide.
The type of the dust remover is selected according to actual needs. Preferably, the dust remover is a bag dust remover or an electric bag composite dust remover. At this time, the calcium-based absorbent was placed in the material of the cake layer on the filter bag of the dust collector.
The desulfurization and dust removal device of the gas boiler provided by the embodiment can ensure SO in flue gas2Is stably controlled at 30mg/m3The smoke dust is controlled at 5mg/m3The 'ultra-low emission' of atmospheric pollutants is realized; moreover, the integrated control of desulfurization and dust removal is realized, the process flow is simple, the operation is simple and convenient, the operation is stable, and the synergistic high-efficiency SO removal can be realized3And no secondary pollution of waste water and waste residue is generated, and no anticorrosive treatment is needed. The desulfurization dust-removing device of the gas boiler is made of common carbon steel, so that the investment and operation cost are lower, compared with the traditional wet desulfurization dust-removing device, the investment cost can be saved by about 20-40%, the operation cost can be saved by about 40%, and the desulfurization dust-removing device has obvious technical and economic application advantages.
Based on the desulfurization and dust removal device for the gas boiler provided by the embodiment, the embodiment also provides a desulfurization and dust removal method for the gas boiler, and the desulfurization and dust removal method for the gas boiler comprises the following steps:
s01) adding a calcium-based absorbent into the transport bed reactor,
s02) introducing flue gas discharged from the gas boiler into the transport bed reactor,
s03) introducing the material and flue gas discharged from the transport bed reactor into a fluidized bed reactor,
s04) introducing the material and flue gas discharged from the fluidized-bed reactor into a dust separator.
The embodiment of the utility model provides a carryThe desulfurization and dust removal method for the gas boiler adopts the two reactors of the conveying bed reactor and the fluidized bed reactor to carry out desulfurization, namely, two-stage absorption desulfurization is realized, the retention time of the absorbent is prolonged, and SO is improvedxThe absorption and removal efficiency is improved, and the consumption of the absorbent is reduced, so that the cost is effectively reduced.
Meanwhile, the desulfurization and dust removal method for the gas boiler provided by the embodiment of the utility model adopts the calcium-based absorbent, so that moisture absorption is not easy, and the requirement on a feeder is reduced; moreover, the pH of the desulfurization by-products is reduced, thereby reducing the cost of disposal.
The temperature of the flue gas discharged by the gas boiler is between 120 and 180 ℃, the flue gas discharged by the gas boiler enters the conveying bed reactor through the flue, and the calcium-based absorbent is added into the conveying bed reactor. In particular, according to SO in flue gasXThe amount of the added concentration-adjusting absorbent. Preferably, the molar ratio of calcium in the calcium-based sorbent added to the sulfur in the flue gas entering the transport bed reactor is between 1.1 and 1.4. Absorption of SO primarily in transport bed reactor3Almost all of SO3And (4) completely absorbing.
The main reaction in the transport bed reactor is as follows:
Ca(OH)2+SO3＝CaSO4·1/2H2O+1/2H2O，
Ca(OH)2+SO2＝CaSO3·1/2H2O+1/2H2O。
in order to accelerate the materials and the flue gas to enter the fluidized bed reactor, a Venturi acceleration device is adopted to introduce the materials and the flue gas discharged by the conveying bed reactor into the fluidized bed reactor.
A large amount of calcium-based absorbent in the conveying bed reactor is not completely reacted, and a large amount of calcium-based absorbent which is not completely reacted is conveyed into the fluidized bed reactor, mixed with the flue gas in a violent turbulent manner and fully contacted to form a violent turbulent material bed layer with a large specific surface, so that the mass transfer and heat transfer between gas and solid are enhanced. Further absorbing SO in the flue gas in a fluidized bed reactorXIs mainly SO2. In order to improve the absorption effect, calcium is mixed withThe molar ratio of sulfur is not less than 60.
The main reaction in a fluidized bed reactor is as follows:
Ca(OH)2+SO2＝CaSO3·1/2H2O+1/2H2O，
Ca(OH)2+SO3＝CaSO4·1/2H2O+1/2H2O，
CaSO3·1/2H2O+1/2O2＝CaSO4·1/2H2O。
in order to further optimize the technical scheme, the desulfurization and dust removal method of the gas boiler further comprises the following steps: atomized water is sprayed into the fluidized bed reactor. This step is performed before or simultaneously with step S03 of S03.
In the desulfurization and dust removal method for the gas boiler, the temperature is reduced by spraying atomized water, and preferably, the temperature of flue gas in the fluidized bed reactor is between 80 and 100 ℃. Meanwhile, by spraying atomized water, the ultrafine particle dust entering the fluidized bed reactor is guaranteed to be always in a humidifying, aggregating and condensing environment under the regulation and control of the atomized water, and the ultrafine particle dust in the flue gas is aggregated and condensed and increased into coarser particles, so that the smoke dust is more favorably removed by a subsequent dust remover. In order to improve the dust removing effect, the grain diameter of the atomized water is preferably selected to be between 50um and 100 um.
Of course, the temperature in the fluidized bed reactor, the particle size of the atomized water, and the molar ratio of calcium to sulfur in the fluidized bed reactor can be selected to other values, and are not limited to the above examples.
In the desulfurization and dust removal method for the gas boiler provided by the embodiment, atomized water is sprayed to the fluidized bed reactor through the sprayer, so that a turbulent environment with high-efficiency mass transfer and heat transfer can be realized, the coagulation of ultrafine dust is facilitated, the dust particles are increased, and the efficient removal of the ultrafine dust in the flue gas is realized; the filter material of the dust remover can be prevented from being burnt due to high temperature by humidifying and cooling by spraying atomized water, so that the dust removing effect is improved.
The material and the flue gas discharged from the fluidized bed reactor directly enter a dust remover. The flue gas is purified by a dust remover and then dischargedAnd (6) discharging. Preferably, a calcium-based absorbent is placed in the dust remover, SO that the SO in the flue gas is further absorbed and removed while the dust in the flue gas is removedxEffectively improving the desulfurization effect. The calcium-based absorbent forms by-products after the reaction and the calcium-based absorbent which is not completely reacted is discharged.
In the dust separator, a large amount of unreacted absorbent is present. In order to further reduce the consumption of the absorbent, the desulfurization and dust removal method of the gas boiler further comprises the following steps:
introducing a part of the material discharged from the dust remover into the transport bed reactor,
discharging the other part of the material discharged by the dust remover to a byproduct storage bin.
In the method, the recycling of the calcium-based absorbent is realized, and the consumption of the calcium-based absorbent is reduced.
In the practical application process, most of the unreacted absorbent and the byproducts are returned to the conveying bed reactor, and a small part of the unreacted absorbent and the byproducts are discharged outside.
The type of the circulating conveying device is selected according to actual needs. In order to simplify the structure and facilitate the conveying, the circulating conveying device is preferably an air chute.
Specifically, the position of the feeder communicated with the conveying bed reactor is positioned at the front end of the conveying bed reactor; the position of the circulating conveying device communicated with the conveying bed reactor is positioned in the middle of the conveying bed reactor.
Preferably, in the desulfurization and dust removal method for a gas boiler, the flue gas discharged from the dust remover is introduced to the chimney through the induced draft fan.
The load fluctuation range of the gas boiler is about 50-110%, and in order to ensure that the conveying bed reactor and the fluidized bed reactor have good adaptability under various working conditions, the desulfurization and dust removal method further comprises the following steps: and introducing part of flue gas at the downstream of the induced draft fan to the transport bed reactor.
Specifically, when the load of the gas-fired boiler is small, the flue gas can be introduced to the conveying bed reactor through the load adjusting pipeline, and the stable operation of the conveying bed reactor and the fluidized bed reactor under the low-load working condition is ensured. For example, the flow speed of flue gas in the conveying bed reactor is not lower than 18m/s under different working condition loads, and the stable operation of the system is ensured.
The calcium-based absorbent is calcium carbonate, calcium hydroxide or calcium oxide. Preferably, the calcium based absorbent is calcium hydroxide.
The type of the dust remover is selected according to actual needs. Preferably, the dust remover is a bag dust remover or an electric bag composite dust remover. At this time, the calcium-based absorbent was placed in the material of the cake layer on the filter bag of the dust collector.
Based on the desulfurization and dust removal device and the desulfurization and dust removal method for the gas boiler provided by the embodiment, a specific embodiment is provided as follows:
in a certain iron and steel enterprise, 1170t/h gas boiler matched with 350MW generator set uses the desulfurization and dust removal method and desulfurization and dust removal device of the gas boiler, and the flue gas volume is 1543606Nm3H (wet scale), oxygen content in flue gas is about 3%; the temperature of the flue gas at the inlet of the conveying bed reactor is about 162 ℃, and SO in the flue gas2The concentration is about 200mg/Nm3The dust concentration in the flue gas is about 10mg/Nm3. Using Ca (OH)2As the calcium-based absorbent, the molar ratio of calcium in the calcium-based absorbent added to the transport bed reactor to sulfur in the flue gas was 1.15.
The flue gas to be purified enters from the bottom of the conveying bed reactor, the front end of the conveying bed reactor controls the addition of the calcium-based absorbent through a rotary feeder, and the calcium-based absorbent added by the feeder and the incompletely-reacted circulating material returned from the bottom of the dust remover through the air chute preliminarily absorb almost all SO3(ii) a The calcium-based absorbent enters a fluidized bed reactor through a Venturi accelerator, atomized water with ultrafine particles is sprayed in through an ejector, the temperature of the flue gas is reduced to 80-100 ℃, and further SO in the flue gas is removedX(this portion is mainly SO-absorption)2) And (4) absorbing and removing. Because the fluidized bed reactor is always in the environment of humidification, agglomeration and coalescence, the ultrafine particle dust is agglomerated and coalesced to form thicker particles, which is more beneficial to being removed by a subsequent bag-type dust remover. Meridian dredging deviceThe dust collector collects the unreacted calcium-based absorbent, and most of the materials return to the middle part of the conveying bed reactor through the air chute and continue to participate in the circulating reaction. The filter bag upper powder cake layer material of the dust remover also contains a certain amount of calcium-based absorbent which can absorb and remove SO in the flue gas again while removing the dust in the flue gas2. After multi-stage treatment, the purified flue gas is discharged to a chimney through a draught fan. When the load of the gas boiler is reduced to be low, the smoke gas amount is small, and the smoke gas flow velocity in the conveying bed reactor is less than 18m/s, the load adjusting pipeline needs to be synchronously opened, and the sufficient smoke gas flow velocity in the conveying bed reactor is kept.
The desulfurization efficiency of the embodiment can reach more than 95 percent, and simultaneously, the smoke dust is ensured to be controlled at 5mg/m3The following. And the process flow is simple, the operation is simple and convenient, the operation is stable, and the SO can be removed efficiently in a synergistic manner3And no secondary pollution of waste water and waste residue is generated, and no anticorrosive treatment is needed. The solid by-product is mainly CaSO3、CaSO4And a small amount of unreacted Ca (OH)2。
Meanwhile, the whole device of the embodiment is made of common carbon steel, so that the investment cost can be saved by about 30% and the operating cost can be saved by about 40% compared with the traditional wet desulphurization and dust removal device, and the device has obvious technical and economic application advantages and no wastewater discharge.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A desulfurization dust removing apparatus of a gas boiler, characterized by comprising: the device comprises a conveying bed reactor, a feeder for adding a calcium-based absorbent into the conveying bed reactor, a fluidized bed reactor communicated with a discharge port of the conveying bed reactor, and a dust remover communicated with the discharge port of the fluidized bed reactor.
2. The desulfurization dust removal apparatus of claim 1, wherein said transport bed reactor is in communication with said fluidized bed reactor via a venturi acceleration device.
3. The desulfurization dust removing apparatus according to claim 1, further comprising: an injector for injecting atomized water into the fluidized bed reactor.
4. The desulfurization dust-removing apparatus according to claim 1,
a calcium-based absorbent is placed in the dust remover;
the desulfurization and dust removal device of the gas boiler further comprises a circulating conveying device, and the circulating conveying device is communicated with a byproduct circulating port of the bag-type dust remover and the conveying bed reactor.
5. The desulfurization dust removing apparatus according to claim 1, further comprising:
a discharge duct communicating with an exhaust port of the dust collector;
a load adjusting pipeline communicating the inlet of the transport bed reactor with the exhaust pipeline;
wherein, the last draught fan that has concatenated of discharge line, the load control pipeline with discharge line's intercommunication position is located the low reaches of draught fan.
6. The desulfurization dust removing apparatus according to any one of claims 1 to 5, further comprising:
the absorbent bin is used for storing the calcium-based absorbent and is communicated with the feeder;
and the byproduct storage bin is communicated with the product discharge port of the dust remover.
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| CN111085092A (en) * | 2020-02-12 | 2020-05-01 | 福建龙净脱硫脱硝工程有限公司 | Desulfurization and dust removal device and desulfurization and dust removal method for gas boiler |
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