CN110787622A - Desulfurization, denitrification and dust removal system for flue gas of slurry oil boiler - Google Patents
Desulfurization, denitrification and dust removal system for flue gas of slurry oil boiler Download PDFInfo
- Publication number
- CN110787622A CN110787622A CN201810879991.3A CN201810879991A CN110787622A CN 110787622 A CN110787622 A CN 110787622A CN 201810879991 A CN201810879991 A CN 201810879991A CN 110787622 A CN110787622 A CN 110787622A
- Authority
- CN
- China
- Prior art keywords
- flue gas
- desulfurization
- dust removal
- communicated
- denitrification
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/02—Separating dispersed particles from gases, air or vapours by liquid as separating agent by passing the gas or air or vapour over or through a liquid bath
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1425—Regeneration of liquid absorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1481—Removing sulfur dioxide or sulfur trioxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/76—Gas phase processes, e.g. by using aerosols
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
Abstract
The invention discloses a desulfurization, denitrification and dust removal system for flue gas of an oil slurry boiler, and belongs to the field of desulfurization and denitrification treatment. The desulfurization, denitrification and dust removal system for the flue gas of the slurry boiler utilizes the denitrification component and the desulfurization and dust removal component, so that the flue gas generated by the combustion of the slurry boiler can pass through the denitrification component, and the nitrogen oxides in the flue gas of the slurry boiler are effectively removed by continuous denitrification for two times; flue gas after denitration reenters desulfurization dust removal subassembly, utilizes venturi moisture washing system, based on the venturi principle, realizes the effective mixture of flue gas and circulating liquid to take off sulfur dioxide and dust in the oil slurry boiler flue gas, ensure that oil slurry boiler flue gas satisfies purification standard to reach standard, reduced oil slurry boiler's fuel cost, created economic benefits for the enterprise.
Description
Technical Field
The invention relates to the field of flue gas desulfurization and denitration treatment, in particular to a desulfurization, denitration and dust removal system for flue gas of an oil slurry boiler.
Background
With the increasing environmental protection situation, the environmental emission standard has increasingly strict emission requirements on pollutants such as sulfur dioxide, nitrogen oxide, dust and the like in the boiler flue gas. Since the existing boiler burns residual oil, which has a high unit price and needs to be purchased in bulk and cannot ensure sufficient supply, the slurry oil boiler using refinery slurry oil is used more and more widely as an energy conversion device capable of replacing the existing boiler.
After the oil slurry in a refinery is used in the combustion of the existing oil slurry boiler, the flue gas generated in the combustion process is directly discharged to the atmosphere.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
because the flue gas that the oil slurry of refinery produced also can contain substances such as a certain amount of sulfur dioxide, nitrogen oxide, dust, directly discharge the flue gas to the atmosphere and be difficult to reach environmental protection emission standard, not only make the enterprise need pay extra environmental protection expense, easily cause environmental pollution moreover, destroy ecological environment.
Disclosure of Invention
In view of this, the invention provides a desulfurization, denitrification and dust removal system for flue gas of an oil slurry boiler, which can effectively remove sulfur dioxide, nitrogen oxide and dust in the flue gas of the oil slurry boiler, thereby realizing environmental protection.
Specifically, the method comprises the following technical scheme:
a desulfurization, denitrification and dust removal system for slurry oil boiler flue gas, the system comprising: a denitration component and a desulfurization and dust removal component, wherein,
the denitration subassembly includes: the device comprises a first dilution fan, a second dilution fan, a dilution metering module, a dilution air preheater, a mixer, an ammonia injection grid, a reactor, at least one group of spray guns and an induced draft fan;
the first dilution fan and an ammonia pipeline are communicated with the dilution metering module, the dilution metering module is communicated with the spray gun, and the spray gun is arranged in the hearth;
the second dilution fan is communicated with the dilution air preheater, the dilution air preheater and the ammonia pipeline are communicated with the mixer, the mixer is communicated with the ammonia injection grid, the dilution air preheater, the ammonia injection grid and the reactor are sequentially arranged in a rear flue communicated with the hearth along the flow direction of flue gas, and the induced fan is arranged at an outlet of the rear flue;
the desulfurization dust removal subassembly includes: a scrubber, a chimney tray, a water-splitting packing facility, at least one circulation pump, at least one venturi ejector, at least one elbow, and at least one venturi nozzle;
draught fan and every the gaseous phase entry intercommunication of venturi sprayer, every the liquid phase entrance at the venturi sprayer is installed to venturi nozzle one-to-one, every the venturi nozzle with the export intercommunication of circulating pump, every the export one-to-one of venturi sprayer with the elbow intercommunication, every the elbow with the scrubbing tower intercommunication, the chimney tray with divide the water filler facility to set gradually along the flow direction of flue gas in the scrubbing tower, the lower part of scrubbing tower is provided with water injection mouth and alkali solution filling mouth, the bottom of the tower of scrubbing tower with the entry intercommunication of circulating pump.
Further, the denitration subassembly still includes: at least one set of dispensing modules disposed between the dilution metering module and the spray gun, the dispensing modules in communication with the spray gun.
Further, the denitration subassembly still includes: a rectification facility disposed within the back flue and between the ammonia injection grid and the reactor.
Further, the reactor comprises n + m catalyst layers, and each catalyst layer is sequentially arranged in the rear flue along the flowing direction of the flue gas.
Further, the outlet of the reactor is provided with a CEMS on-line analysis meter.
Further, the desulfurization dust removal assembly also comprises: at least one first flue baffle, every first flue baffle sets up the draught fan with every between venturi ejector's the larynx gaseous phase entry.
Further, the desulfurization dust removal assembly also comprises: and the filter is connected with the outlet branch pipe of the circulating pump.
Further, the desulfurization dust removal assembly also comprises: the filter comprises a filtrate pool and a reflux pump, wherein the filtrate pool is communicated with the bottom of the filter, the inlet of the reflux pump is communicated with the filtrate pool, and the outlet of the reflux pump is communicated with the lower part of the washing tower.
Further, the desulfurization dust removal assembly also comprises: the sewage treatment device comprises a sewage buffer tank and an external delivery pump, wherein the sewage buffer tank is communicated with the filter, an inlet of the external delivery pump is communicated with the sewage buffer tank, and an outlet of the external delivery pump is communicated with a sewage treatment plant.
Further, the desulfurization dust removal assembly also comprises: and the waste residue box is communicated with the bottom of the filter.
The technical scheme provided by the embodiment of the invention has the beneficial effects that:
1. the first dilution fan and the ammonia introducing pipeline in the denitration assembly are communicated with the dilution metering module, so that ammonia gas and air can be diluted and mixed in the dilution metering module, and then are sprayed into a hearth where flue gas flows through a spray gun, and react with partial nitrogen oxides in the flue gas to generate nitrogen and water, and the first denitration of the flue gas is realized; the second dilution fan in the denitration assembly is communicated with the dilution air preheater, and the dilution air preheater and the ammonia introducing pipeline are communicated with the mixer, so that ammonia gas is mixed with air preheated by the dilution air preheater, the ammonia gas is diluted and sprayed into the rear flue through the ammonia spraying grid, and nitrogen oxides in the flue gas further react with the ammonia gas to generate nitrogen and water through catalytic reaction in the reactor, so that the second denitration of the flue gas is realized, the nitrogen oxides in the flue gas of the slurry boiler are effectively removed, and the flue gas is ensured to meet the standard requirements of denitration and purification;
2. the denitrated flue gas enters the desulfurization and dust removal assembly from an outlet of the rear flue through the induced draft fan, enters a gas phase inlet of the venturi ejector through the suction force of the venturi ejector, meanwhile, the circulating pump injects circulating liquid into a venturi nozzle at a liquid phase inlet of the venturi ejector, so that the flue gas and the circulating liquid can be fully mixed at the throat diameter of the venturi ejector, sulfur dioxide and solid particles in the flue gas are adsorbed into circulating liquid drops, the sulfur dioxide and the solid particles in the mixed gas-liquid mixture are removed through an elbow, the mixed gas-liquid mixture enters the washing tower, and the flue gas can be discharged out of the washing tower after being sequentially distributed by a chimney tray and liquid separation of a water separation filler facility and enters the atmosphere; acid-base neutralization reaction occurs in the circulating liquid, the circulating liquid is discharged from the bottom of the washing tower and then enters a circulating pump, cyclic utilization is realized, sulfur dioxide and dust in flue gas of the slurry boiler are effectively removed, the flue gas of the slurry boiler meets the standard requirement of desulfurization and purification, the slurry can be used as boiler fuel for normal use, the fuel cost of the slurry boiler is reduced, and higher economic benefit is created for enterprises.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a desulfurization, denitrification and dust removal system for flue gas of an oil slurry boiler provided by an embodiment of the invention.
The reference numerals in the figures are denoted respectively by:
1-denitration component, 101-first dilution fan, 102-second dilution fan, 103-dilution metering module, 104-dilution air preheater, 105-mixer, 106-ammonia injection grid, 107-reactor, 108-spray gun, 109-induced draft fan, 110-distribution module, 111-rectification facility, 112-CEMS on-line analysis instrument, 113-on-line detection instrument, 114-first flow regulating valve, 115-second flow regulating valve,
2-desulfurization and dust removal component, 201-washing tower, 202-chimney tray, 203-water-diversion filler facility, 204-circulating pump, 205-Venturi ejector, 206-elbow, 207-Venturi nozzle, 208-water injection inlet, 209-alkali solution injection inlet, 210-first flue baffle, 211-filter, 212-filtrate tank, 213-reflux pump, 214-sewage buffer tank, 215-outward pump, 216-waste slag box, 217-second flue baffle, 218-blind plate, 219-tower top chimney, 220-water removal chimney cap, 221-liquid level control regulating valve, 222-third flow regulating valve, 223-fourth flow regulating valve, 224-PH monitor,
3-a furnace chamber is arranged in the furnace,
4-rear flue.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings.
The embodiment of the invention provides a desulfurization, denitrification and dedusting system for ammonia gas in an oil slurry boiler, which is shown in a schematic structural diagram of fig. 1, wherein the flue gas volume of two oil slurry boilers (5#, 6#) in normal operation is 472000Nm3The operational flexibility is 30-100%, but the number of the slurry boilers, the smoke amount in normal operation, the operational flexibility and other parameters are not particularly limited in the embodiment of the invention.
The system comprises: denitration subassembly 1 and desulfurization dust removal subassembly 2.
Wherein, denitration subassembly 1 includes: a first dilution fan 101, a second dilution fan 102, a dilution metering module 103, a dilution air preheater 104, a mixer 105, an ammonia injection grid 106, a reactor 107, at least one spray gun 108 and an induced draft fan 109;
the first dilution fan 101 and the ammonia pipeline are communicated with the dilution metering module 103, the dilution metering module 103 is communicated with the spray gun 108, and the spray gun 108 is arranged in the hearth 3 where the flue gas flows;
the second dilution fan 102 is communicated with the dilution air preheater 104, the dilution air preheater 104 and an ammonia pipeline are communicated with the mixer 105, the mixer 105 is communicated with the ammonia injection grid 106, the dilution air preheater 104, the ammonia injection grid 106 and the reactor 107 are sequentially arranged in the rear flue 4 communicated with the hearth 3 along the flow direction of flue gas, and the induced draft fan 109 is arranged at the outlet of the rear flue 4;
desulfurization dust pelletizing subassembly 2 includes: a scrubber column 201, a chimney tray 202, a water-splitting packing facility 203, at least one circulation pump 204, at least one venturi ejector 205, at least one elbow 206, and at least one venturi nozzle 207;
the induced draft fan 109 is communicated with a gas phase inlet of each venturi ejector 205, each venturi nozzle 207 is correspondingly arranged at a liquid phase inlet of the venturi ejector 205, each venturi nozzle 207 is communicated with an outlet of a circulating pump, an outlet of each venturi ejector 205 is correspondingly communicated with an elbow 206, each elbow 206 is communicated with the washing tower 201, the chimney tray 202 and the water diversion filler facility 203 are sequentially arranged in the washing tower 201 along the flowing direction of flue gas, a water injection inlet 208 and an alkali solution injection inlet 209 are arranged at the lower part of the washing tower 201, and the tower bottom of the washing tower 201 is communicated with an inlet of the circulating pump 204.
The components and devices in the components are connected through pipelines; simultaneously, this system is applicable to a plurality of slurry oil boilers and carries out SOx/NOx control dust removal, when carrying out a plurality of slurry oil boiler SOx/NOx control dust removals, every slurry oil boiler sets up one set of denitration subassembly 1 separately, and a plurality of slurry oil boilers share one set or more sets of SOx/NOx control dust removal subassembly 2.
In the embodiment of the invention, the temperature of ammonia gas entering from the ammonia introducing pipeline is 34 ℃, the pressure is 0.3MPa, and NaOH solution with the mass fraction of 20% can be used as the alkali solution; two slurry oil boilers set up one set of denitration subassembly 1 respectively, and one set of desulfurization dust removal subassembly 2 is shared to two slurry oil boilers.
Therefore, the desulfurization, denitrification and dust removal system for the flue gas of the slurry oil boiler in the embodiment of the invention utilizes the denitrification component 1 and the desulfurization and dust removal component 2, on one hand, two slurry oil boilers are respectively communicated with the dilution metering module 103 through the first dilution fan 101 and the ammonia introducing pipeline in the corresponding denitrification component 1, so that ammonia gas and air can be mixed in the dilution metering module 103 and then sprayed into the hearth 3 through the spray gun 108, and react with part of nitrogen oxides in the flue gas to generate nitrogen and water, thereby realizing the first denitrification of the flue gas; the second dilution fan 102 and the dilution air preheater 104 in the denitration assembly 1 are communicated, the dilution air preheater 104 and the ammonia introducing pipeline are communicated with the mixer 105, so that ammonia gas is mixed with air preheated by the dilution air preheater 104, the ammonia gas is diluted, the ammonia gas is sprayed into the rear flue 4 through the ammonia spraying grid 106, and nitrogen oxides in the flue gas further react with the ammonia gas to generate nitrogen and water through catalytic reaction in the reactor 107, so that the second denitration of the flue gas is realized, the nitrogen oxides in the flue gas of the slurry boiler are effectively removed, and the flue gas is ensured to meet the standard requirements of denitration and purification;
on the other hand, flue gas after denitration of two boilers enters the desulfurization and dust removal assembly 2 from an outlet of the rear flue 4 through the induced draft fan 109, enters a gas phase inlet of the venturi ejector 205 through the suction force of the venturi ejector 205, meanwhile, the circulating pump 204 injects circulating liquid into the venturi nozzle 207 at a liquid phase inlet of the venturi ejector 205, so that the flue gas and the circulating liquid can be fully mixed at the throat diameter of the venturi ejector 205, sulfur dioxide and solid particles in the flue gas are adsorbed into circulating liquid drops, the sulfur dioxide and the solid particles are removed from the mixed gas-liquid mixture through the elbow 206, the mixed gas-liquid mixture enters the washing tower 201, and the flue gas can be discharged out of the washing tower 201 after being sequentially distributed by the chimney tray 202 and subjected to liquid separation by the water separation filler facility 203 and then enters the atmosphere; acid-base neutralization reaction occurs in the circulating liquid, the circulating liquid is discharged from the bottom of the washing tower 201 and then enters the circulating pump 204, recycling is achieved, sulfur dioxide and dust in flue gas of the slurry boiler are effectively removed, the flue gas is guaranteed to meet the standard requirement of desulfurization purification, the slurry can be used as boiler fuel normally, fuel cost of the slurry boiler is reduced, and high economic benefit is created for enterprises.
It can be understood that the number of the venturi ejectors 205 and the circulating pumps 204 is determined according to the amount of the flue gas, for example, when the amount of the flue gas is small, the number of the corresponding venturi ejectors 205 and the corresponding circulating pumps 204 is relatively small, and thus the arrangement is performed to achieve the optimized operation and save the electricity.
Based on the above device, the following further explains the desulfurization, denitrification and dust removal system for flue gas of slurry oil boiler according to the embodiment of the invention:
for denitration subassembly 1, denitration subassembly 1 plays the effect of desorption nitrogen oxide in the flue gas, and above-mentioned device has explained the method that adopts two continuous denitration to denitrate to satisfy denitration purification standard up to standard.
For the first denitration, in order to control the amount of ammonia gas participating in the denitration reaction, the denitration module 1 further includes: as shown in fig. 1, the first flow rate adjustment valve 114 can control the amount of the ammonia gas introduced by the first flow rate adjustment valve 114, thereby ensuring smooth progress of the denitration reaction.
Optionally, in order to ensure that the diluted ammonia gas mixed with the air provided by the first dilution fan 101 and the ammonia gas entering through the ammonia introducing line can be uniformly sprayed into the lance 108, the denitration assembly 1 further includes: at least one set of distribution modules 110, the distribution modules 110 being disposed between the dilution metering module 103 and the lance 108, the distribution modules 110 being in communication with the lance 108, as shown in FIG. 1.
So set up for diluted ammonia can send into spray gun 108 through distribution module 110 uniformly, with the homogeneity that ensures the ammonia and spout in, improves denitration efficiency.
It should be noted that the temperature in the hearth 3 of the region where the lance 108 is located needs to be 870 to 1050 ℃.
For the second denitration, the flue gas is subjected to the second denitration after the first denitration, and after partial denitration is performed on the flue gas, the flue gas firstly needs to pass through a screen superheater (not shown in fig. 1), a high-temperature superheater (not shown in fig. 1), a low-temperature superheater (not shown in fig. 1) and a high-temperature economizer (not shown in fig. 1) which are arranged in the rear flue 4, so that the heat of the flue gas is exchanged to 360 ℃, and then the flue gas flows to the ammonia injection grid 106 to be mixed with the preheated diluted ammonia gas.
Likewise, in order to control the amount of ammonia gas participating in the denitration reaction, denitration module 1 further includes: the second flow rate adjustment valve 115, as shown in fig. 1, can control the amount of the ammonia gas introduced by the second flow rate adjustment valve 115, thereby ensuring smooth progress of the denitration reaction.
In order to make flue gas and diluted ammonia can obtain the rectification, be convenient for the ammonia and the nitrogen oxide reaction in the flue gas, denitration subassembly 1 still includes: a rectification facility 111, the rectification facility 111 being disposed in the rear flue 4 between the ammonia injection grid 106 and the reactor 107, as shown in fig. 1.
When the mixture of flue gas and diluted ammonia flows through rectification facility 111, can optimize and realize that flue gas velocity field distributes evenly, also accomplish the mixing of diluted ammonia and flue gas simultaneously, the realization of the denitration of being convenient for.
Particularly, the rectification device 111 can be a rectification grating, and particles are uniformly distributed in the flue gas after rectification, so that the dust removal effect of subsequent flue gas can be improved.
Further, after the mixture of the flue gas and the diluted ammonia gas passes through the rectification facility 111, before entering the reactor 107 for the denitration reaction, an online detection instrument 113 for nitrogen oxides, flow and water content needs to be arranged at an inlet of the reactor 107, and according to the flue gas flow and the difference value of the nitrogen oxide content at the inlet and outlet of the second denitration, the ammonia consumption amount, namely the feeding amount of the ammonia pipeline, is calculated by the system, so that the cascade control of the feeding amount of the ammonia gas is realized, the treatment effect of the reactor 107 is ensured, and the escape of the ammonia is reduced.
To achieve denitration, for the reactor 107, the reactor 107 includes n + m catalyst layers, each of which is disposed in the rear flue 4 in turn along the flow direction of the flue gas, as shown in fig. 1.
Wherein n is the number of layers of the catalyst layer meeting the current emission requirement, and the value of n depends on the concentration of nitrogen oxides in the flue gas and the current emission standard; and m is the number of reserved catalyst layers meeting the future emission standard, and the value of the m depends on the current emission standard and the predicted future ultralow emission standard.
For example, the concentration of nitrogen oxides in the existing flue gas is low, and n may be 2, that is, 2 catalyst beds are arranged to meet the current emission requirement; however, in the future, the emission standard may be increased, more catalyst beds are needed, and a catalyst bed m is reserved, and generally m is 1.
The flue gas and the diluted ammonia gas can be catalyzed by a catalyst in the reactor 107, so that nitrogen oxides and ammonia in the flue gas can be generated into nitrogen and water, and most of the nitrogen oxides in the flue gas can be removed.
After the flue gas is denitrated by the reactor 107, the outlet of the reactor 107 is provided with a CEMS (flue gas on-line monitoring system) on-line analysis instrument 112 to perform real-time on-line analysis on the content of nitrogen oxides, the content of sulfur dioxide and the concentration of ammonia, so as to detect the removal effect of nitrogen oxides and the concentration of ammonia escaping in the flue gas, ensure the denitration efficiency, reduce the ammonia escaping amount and reduce the generation amount of ammonium bisulfate.
For the desulfurization dust removal component 2, the desulfurization dust removal component 2 plays a role in removing sulfur dioxide and dust in the flue gas, and the device explains the method for desulfurization and dust removal by adopting a spray venturi wet gas washing system mode so as to meet the standard of desulfurization dust removal purification.
In order to realize the desulfurization and dust removal treatment of the flue gas and ensure that the flue gas is communicated with the original chimney, the flue gas can still enter the original chimney by arranging a tee joint on a pipeline behind the induced draft fan 109. When the flue gas needs to be desulfurized and dedusted, the communication between the flue and the original chimney can be cut off by arranging a second flue baffle 217 and a blind plate 218 between the flue and the original chimney as shown in fig. 1.
In the embodiment of the invention, after the flue gas of each of the two slurry oil boilers passes through the reactor 107, the flue gas is subjected to heat exchange to 140 ℃, and the flue gas at the moment is sent to the denitration dust removal assembly 2 through the induced draft fan 109.
It should be noted that, the desulfurization dust removal assembly 2 further includes: at least one first flue damper 210, each first flue damper 210 being disposed between the induced draft fan 109 and the gas phase inlet of each venturi ejector 205, as shown in FIG. 1.
The arrangement is carried out in such a way, the number of the Venturi ejector 205 is adjusted according to different operation loads of the slurry boiler, and the operation effect of the Venturi ejector 205 is ensured.
In the embodiment of the present invention, four venturi ejectors 205 may be provided, and every two venturi ejectors 205 are responsible for the flue gas desulfurization and dust removal treatment of one slurry boiler.
It should be noted that, when the restricted fluid passes through the narrowed flow cross section, the flow velocity of the fluid increases, and the flow velocity is inversely proportional to the flow cross section, but as known from bernoulli's law, the increase in flow velocity is accompanied by a decrease in fluid pressure, i.e., a common venturi effect. In general, the venturi effect refers to the generation of low pressure in the vicinity of a fluid flowing at high speed, thereby generating a suction effect; and the greater the flow rate, the lower the pressure. Thus, a venturi ejector 205 designed according to the venturi effect can achieve efficient mixing of the flue gas with the circulating liquid. Moreover, the mode of externally arranging the venturi ejector 205 can be used for treating the flue gas from a plurality of sets of devices, and the common washing tower 201 for the flue gas desulfurization and dust removal treatment of the plurality of sets of devices can be realized, so that the occupied area of equipment and the investment cost are reduced.
For the flue gas entering the scrubber 201, after entering the scrubber 201, the flue gas is distributed by the chimney tray 202, and then is subjected to liquid separation by the water separation filler device 203, and then can be discharged into the atmosphere through the tower top chimney 219 and the water removal chimney cap 220, as shown in fig. 1.
After entering the washing tower 201, the circulating liquid may be neutralized after being mixed with an alkali solution at the lower part of the washing tower 201, and then discharged from the bottom of the washing tower 201 and enter the circulating pump 204, and may be reinjected through the circulating pump 204, and meanwhile, the system for removing sulfur, nitrogen and dust of flue gas of an oil slurry boiler according to the embodiment of the present invention may also process the circulating liquid.
Furthermore, in order to control the water inflow, a water inlet pipeline connected to the water injection port 208 is provided with a liquid level control regulating valve 221, which can control the amount of water entering the washing tower 201 and adjust the liquid level in the washing tower 201.
Meanwhile, in order to control the injection amount of the alkali solution, a fourth flow control valve 223 is disposed on a liquid inlet pipeline communicated with the alkali solution injection port 209, and a PH monitor 224 is disposed at an outlet of the washing tower 201, so that the opening degree of the fourth flow control valve 223 can be controlled by observing data of the PH monitor 224, thereby controlling the amount of the alkali solution to be supplemented.
It should be noted that the number of the circulating pumps 204 is selectively set according to the amount of the flue gas, so as to ensure that the optimized operation is realized, thereby saving electricity.
Specifically, the desulfurization dust removal assembly 2 further comprises: the filter 211, the filter 211 is connected with the outlet branch pipe of the circulating pump 204, as shown in fig. 1, the circulating liquid can be filtered by the filter 211, and the sewage with the suspended matter content less than 20mg/L can be obtained.
In order to control the flow rate of sewage entering the filter 211, a third flow rate adjustment valve 222 is further provided between the filter 211 and the outlet branch pipe of the circulation pump 204, and the flow rate of sewage entering the filter 211 can be controlled by the third flow rate adjustment valve 222.
Further, it is necessary to treat the liquid and the waste residue filtered by the filter 211.
For the treatment of the filtered liquid, on the one hand, the desulfurization and dust removal assembly 2 further comprises: the filtrate tank 212 is communicated with the bottom of the filter 211, the inlet of the reflux pump 213 is communicated with the filtrate tank 212, and the outlet of the reflux pump 213 is communicated with the lower part of the washing tower 201.
The liquid entering the filtrate tank 212 is a circulating liquid which can be recycled continuously, and the circulating liquid can enter the lower part of the washing tower 201 again for recycling through the pressurization of the reflux pump 213.
On the other hand, the desulfurization dust-removal assembly 2 further comprises: a sewage buffer tank 214 and an outward-feeding pump 215, wherein the sewage buffer tank 214 is communicated with the filter 211, the inlet of the outward-feeding pump 215 is communicated with the sewage buffer tank 214, and the outlet of the outward-feeding pump 215 is communicated with a sewage treatment plant, as shown in figure 1.
The liquid entering the sewage buffer tank 214 is purified waste liquid, is stored in the sewage buffer tank 214, is pressurized by the outward-feeding pump 215, and is pumped to a sewage treatment plant for further treatment.
For the treatment of the filtered waste residue, the desulfurization and dust removal assembly 2 further comprises a waste residue tank 216, the waste residue tank 216 is communicated with the bottom of the filter 211, the waste residue is stored, and finally the waste residue is sent out of the system through a waste residue vehicle.
In the embodiment of the present invention, it can be known through detection that the properties of the flue gas treated by the desulfurization, denitrification and dust removal system are as shown in table 1 below:
TABLE 1 flue gas Properties Table
As can be seen from the analysis of Table 1, the flue gas of the slurry oil boiler after desulfurization, denitrification and dedusting treatment of the system meets the existing emission standard, ensures that the slurry oil can be used as boiler fuel for normal use, reduces the fuel cost of the slurry oil boiler, and can create great economic benefit for enterprises.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a desulfurization denitration dust pelletizing system of slurry oil boiler flue gas which characterized in that, the system includes: a denitration component (1) and a desulfurization and dust removal component (2), wherein,
the denitration module (1) comprises: the system comprises a first dilution fan (101), a second dilution fan (102), a dilution metering module (103), a dilution air preheater (104), a mixer (105), an ammonia injection grid (106), a reactor (107), at least one group of spray guns (108) and an induced draft fan (109);
the first dilution fan (101) and an ammonia pipeline are communicated with the dilution metering module (103), the dilution metering module (103) is communicated with the spray gun (108), and the spray gun (108) is arranged in the hearth (3);
the second dilution fan (102) is communicated with the dilution air preheater (104), the dilution air preheater (104) and the ammonia pipeline are communicated with the mixer (105), the mixer (105) is communicated with the ammonia injection grid (106), the dilution air preheater (104), the ammonia injection grid (106) and the reactor (107) are sequentially arranged in a rear flue (4) communicated with the hearth (3) along the flow direction of flue gas, and the induced draft fan (109) is arranged at an outlet of the rear flue (4);
the desulfurization and dust removal assembly (2) comprises: a scrubber (201), a chimney tray (202), a water-dividing packing facility (203), at least one circulation pump (204), at least one venturi ejector (205), at least one elbow (206), and at least one venturi nozzle (207) and filter (211);
the induced draft fan (109) is communicated with the gas phase inlet of each Venturi ejector (205), each Venturi nozzle (207) is installed at the liquid phase inlet of the Venturi ejector (205) in a one-to-one correspondence manner, each Venturi nozzle (207) is communicated with the outlet of the circulating pump (204), the filter (211) is connected with an outlet branch pipe of the circulating pump (204), the outlet of each Venturi ejector (205) is communicated with the elbow (206) in a one-to-one correspondence manner, each elbow (206) is communicated with the washing tower (201), the chimney tray (202) and the water-dividing filler facility (203) are arranged in the washing tower (201) in sequence along the flow direction of the flue gas, the lower part of the washing tower (201) is provided with a water injection port (208) and an alkali solution injection port (209), the bottom of the washing tower (201) is communicated with the inlet of the circulating pump (204).
2. The system for desulfurization, denitrification and dust removal of flue gas of slurry oil boiler according to claim 1, wherein the denitration module (1) further comprises: at least one set of dispensing modules (110), the dispensing modules (110) being disposed between the dilution metering module (103) and the spray gun (108), the dispensing modules (110) being in communication with the spray gun (108).
3. The system for desulfurization, denitrification and dust removal of flue gas of slurry oil boiler according to claim 1, wherein the denitration module (1) further comprises: a rectification means (111), said rectification means (111) being disposed within said back flue (4) and between said ammonia injection grid (106) and said reactor (107).
4. The system for desulfurization, denitrification and dust removal of slurry boiler flue gas according to claim 1, wherein the reactor (107) comprises n + m catalyst layers, each of which is disposed in the rear flue (4) in turn along the flow direction of the flue gas.
5. The system for desulfurization, denitrification and dust removal of slurry boiler flue gas according to claim 1, wherein the outlet of the reactor (107) is provided with a CEMS on-line analyzer (112).
6. The system for desulfurization, denitrification and dust removal of slurry boiler flue gas as set forth in claim 1, wherein said desulfurization and dust removal module (2) further comprises: at least one first flue damper (210), each first flue damper (210) disposed between the induced draft fan (109) and each venturi ejector (205) gas phase inlet.
7. The system for desulfurization, denitrification and dust removal of slurry boiler flue gas as set forth in claim 1, wherein said desulfurization and dust removal module (2) further comprises: the filter liquid pond (212) and backwash pump (213), the filtrate pond (212) with the bottom intercommunication of filter (211), the entry of backwash pump (213) with filtrate pond (212) intercommunication, the export of backwash pump (213) with the lower part intercommunication of scrubbing tower (201).
8. The system for desulfurization, denitrification and dust removal of flue gas of slurry boiler according to claim 1, wherein the desulfurization and dust removal assembly (2) further comprises: the filter comprises a sewage buffer tank (214) and an outward-feeding pump (215), wherein the sewage buffer tank (214) is communicated with the filter (211), the inlet of the outward-feeding pump (215) is communicated with the sewage buffer tank (214), and the outlet of the outward-feeding pump (215) is communicated with a sewage treatment plant.
9. The system for desulfurization, denitrification and dust removal of slurry boiler flue gas as set forth in claim 1, wherein said desulfurization and dust removal module (2) further comprises: a waste tank (216), the waste tank (216) communicating with the bottom of the filter (211).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810879991.3A CN110787622A (en) | 2018-08-03 | 2018-08-03 | Desulfurization, denitrification and dust removal system for flue gas of slurry oil boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810879991.3A CN110787622A (en) | 2018-08-03 | 2018-08-03 | Desulfurization, denitrification and dust removal system for flue gas of slurry oil boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110787622A true CN110787622A (en) | 2020-02-14 |
Family
ID=69425737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810879991.3A Pending CN110787622A (en) | 2018-08-03 | 2018-08-03 | Desulfurization, denitrification and dust removal system for flue gas of slurry oil boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110787622A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0474512A (en) * | 1990-07-13 | 1992-03-09 | Hitachi Zosen Corp | Method for simultaneous desulfurization and denitration in furnace |
| CN101259369A (en) * | 2008-04-29 | 2008-09-10 | 北京中科创丰科技有限公司 | Flue gas desulfurization denitration dust removing integrated technique |
| JP2008302345A (en) * | 2007-06-11 | 2008-12-18 | Babcock Hitachi Kk | Exhaust gas treatment system |
| CN104645786A (en) * | 2013-11-25 | 2015-05-27 | 大连康赛谱科技发展有限公司 | Device and method for refinery catalytic regeneration flue gas Venturi scrubbing desulphurization |
| CN106268318A (en) * | 2016-09-21 | 2017-01-04 | 海南中航特玻科技有限公司 | A kind of glass furnace fume integral denitration desulfurization dust-removing technique equipment and technique |
| JP2017177046A (en) * | 2016-03-31 | 2017-10-05 | 三菱重工業株式会社 | Exhaust gas treatment method and system |
| CN107497268A (en) * | 2017-10-13 | 2017-12-22 | 广东丰乐能源科技有限公司 | A kind of coal-fired flue-gas processing system and coal-burning boiler system |
-
2018
- 2018-08-03 CN CN201810879991.3A patent/CN110787622A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0474512A (en) * | 1990-07-13 | 1992-03-09 | Hitachi Zosen Corp | Method for simultaneous desulfurization and denitration in furnace |
| JP2008302345A (en) * | 2007-06-11 | 2008-12-18 | Babcock Hitachi Kk | Exhaust gas treatment system |
| CN101259369A (en) * | 2008-04-29 | 2008-09-10 | 北京中科创丰科技有限公司 | Flue gas desulfurization denitration dust removing integrated technique |
| CN104645786A (en) * | 2013-11-25 | 2015-05-27 | 大连康赛谱科技发展有限公司 | Device and method for refinery catalytic regeneration flue gas Venturi scrubbing desulphurization |
| JP2017177046A (en) * | 2016-03-31 | 2017-10-05 | 三菱重工業株式会社 | Exhaust gas treatment method and system |
| CN106268318A (en) * | 2016-09-21 | 2017-01-04 | 海南中航特玻科技有限公司 | A kind of glass furnace fume integral denitration desulfurization dust-removing technique equipment and technique |
| CN107497268A (en) * | 2017-10-13 | 2017-12-22 | 广东丰乐能源科技有限公司 | A kind of coal-fired flue-gas processing system and coal-burning boiler system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101601965B (en) | Ammonia-spraying grid device for SCR-method flue gas denitrification, and SCR-method flue gas denitrification process | |
| CN104888591A (en) | Boiler flue gas denitration purification system and boiler flue gas denitration purification method | |
| CN101653682A (en) | Boiler-rear flue gas desulphurization and synergism device of circulating fluid bed boiler and desulphurization and synergism method | |
| CN106582286B (en) | Flue gas purification device and method | |
| CN103977702B (en) | A kind of circulating fluid bed flue-gas desulfurizing denitration demercuration integrated apparatus and method | |
| CN204159203U (en) | A kind of flue gas denitrification system being exclusively used in three-waste fluidized mix combustion furnace | |
| CN107261837A (en) | It is a kind of to quote denitrification apparatus and technique that high-temperature flue gas carries out urea pyrolysis ammonia | |
| CN101342455B (en) | Rotational flow and spray combined desulfurizing device | |
| CN101342454B (en) | Rotational flow and spray combined desulfurizing device | |
| CN205386412U (en) | Boiler flue gas denitration system | |
| CN203916431U (en) | A kind of gaseous oxidation is in conjunction with the flue gas combined desulfurization and denitration device of wet absorption | |
| CN201300034Y (en) | Vortex-sprinkling combined desulphurizing device | |
| CN201263964Y (en) | Rotational flow and spray combined desulfurizing device | |
| CN2712446Y (en) | Flue-gas desulfurization and denitration device | |
| CN110787622A (en) | Desulfurization, denitrification and dust removal system for flue gas of slurry oil boiler | |
| CN202962241U (en) | Device for synergistically removing flue gas mercury | |
| CN205598941U (en) | Flue -gas desulfurizing device by ammonia process | |
| CN113413753A (en) | High-sulfur coal single-tower spray layer pH value layered control device and use method | |
| CN112090255A (en) | Mobile coal-fired startup boiler multi-pollutant collaborative removal system and method | |
| CN207169394U (en) | A kind of removing sulfur trioxide device suitable for large scale section flue | |
| CN207429853U (en) | A kind of pre- dedusting and desulphurization and denitration integrated treatment unit | |
| CN207012764U (en) | A kind of flue gas purification system | |
| CN213120123U (en) | Desulfurization and denitrification flue gas circulation system | |
| CN214598187U (en) | Combined treatment system for desulfurization and SCR denitration of flue gas circulating fluidized bed | |
| CN211725337U (en) | Flue gas desulfurization device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200214 |