CN112844841A - Alkali spraying type wet electrostatic dust removal system and process - Google Patents
Alkali spraying type wet electrostatic dust removal system and process Download PDFInfo
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- CN112844841A CN112844841A CN202110138929.0A CN202110138929A CN112844841A CN 112844841 A CN112844841 A CN 112844841A CN 202110138929 A CN202110138929 A CN 202110138929A CN 112844841 A CN112844841 A CN 112844841A
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- 239000000428 dust Substances 0.000 title claims abstract description 106
- 238000005507 spraying Methods 0.000 title claims abstract description 99
- 239000003513 alkali Substances 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims description 34
- 230000008569 process Effects 0.000 title claims description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 125
- 239000003546 flue gas Substances 0.000 claims abstract description 78
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 76
- 239000007921 spray Substances 0.000 claims abstract description 50
- 239000012719 wet electrostatic precipitator Substances 0.000 claims abstract description 21
- 238000009827 uniform distribution Methods 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims description 13
- 239000002699 waste material Substances 0.000 claims description 10
- 239000000779 smoke Substances 0.000 claims description 9
- 238000003860 storage Methods 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 239000002351 wastewater Substances 0.000 claims description 4
- 238000000889 atomisation Methods 0.000 claims description 3
- 239000003595 mist Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 2
- 238000005422 blasting Methods 0.000 claims 7
- 239000012717 electrostatic precipitator Substances 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000002485 combustion reaction Methods 0.000 description 6
- 239000002253 acid Substances 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 230000003009 desulfurizing effect Effects 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 4
- 229910052815 sulfur oxide Inorganic materials 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 238000009776 industrial production Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
- 239000012716 precipitator Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- HLLSOEKIMZEGFV-UHFFFAOYSA-N 4-(dibutylsulfamoyl)benzoic acid Chemical compound CCCCN(CCCC)S(=O)(=O)C1=CC=C(C(O)=O)C=C1 HLLSOEKIMZEGFV-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/02—Plant or installations having external electricity supply
- B03C3/16—Plant or installations having external electricity supply wet type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/74—Cleaning the electrodes
- B03C3/78—Cleaning the electrodes by washing
Abstract
The invention belongs to the field of environment-friendly dust removal equipment, and particularly relates to a wet electrostatic dust removal system which comprises a wet electrostatic dust remover, and a weak alkali liquor spraying device and a circulating water spraying device which are connected with the wet electrostatic dust remover. The wet electrostatic precipitator comprises a shell, wherein a horn-shaped flue gas inlet and a horn-shaped flue gas outlet are oppositely arranged in the horizontal direction of the shell, a dust collecting plate and a discharge electrode are arranged in the shell, a flue gas channel is formed between the dust collecting plates, the discharge electrode is arranged between the two dust collecting plates, and an ash hopper is arranged at the bottom of the shell. The alkali spraying nozzle is connected to the alkali spraying pipe one end of the weak alkali liquor spraying device, and is arranged in the flue gas inlet of the shell, the air flow uniform distribution plate is further arranged in the middle section of the flue gas inlet, the alkali spraying nozzle is just opposite to the air flow uniform distribution plate, and a plurality of holes are formed in the air flow uniform distribution plate. One end of a spray water pipe of the circulating water spraying device is connected with a water nozzle and is arranged at the top of the shell. The invention utilizes low-concentration alkali liquor to add alkali through an alkali spraying technology, thereby not only having low alkali consumption and low operation cost, but also prolonging the service life of the dust remover.
Description
Technical Field
The invention belongs to the field of environment-friendly dust removing equipment, and particularly relates to a wet electrostatic dust removing system and a wet electrostatic dust removing process.
Background
In industrial production, the main way of supplying power resources at present, i.e. a thermal power plant, generates a large amount of flue gas containing sulfur oxides. Before being discharged, the flue gas needs to be treated by a purification and dust removal device such as a desulfurization absorption tower, a dust remover, a chimney and the like before being discharged into the external environment. The purification of sulfur oxides in the flue gas of a thermal power plant mainly comprises the modes of desulfurizing before combustion, fixing sulfur during combustion, desulfurizing after combustion and the like, and the dust removal modes are classified into bag type dust removal, electric-bag composite dust removal, electrostatic dust removal and the like.
In industrial production, especially in the main mode of supplying electric power resources in China, namely a thermal power plant, a large amount of flue gas containing sulfur oxides is generated. Before being discharged, the flue gas needs to be treated by a purification and dust removal device such as a desulfurization absorption tower, a dust remover, a chimney and the like before being discharged into the external environment. The purification of the sulfur oxides in the flue gas of the domestic thermal power plant mainly comprises the modes of desulfurizing before combustion, fixing sulfur during combustion, desulfurizing after combustion and the like, and the dust removal modes are classified into bag type dust removal, electric-bag composite dust removal, electrostatic dust removal and the like.
Electrostatic dust collectors are of various types, and can be classified into dry type, semi-dry type and wet type electrostatic dust collection according to whether liquid is used in the electrode dust removal process. The wet electrostatic precipitator belongs to emerging environmental protection equipment, and is hot ultra-low emission engineering equipment in recent years. The wet electrostatic dust collector has the working principle that smoke is ionized after high voltage is applied to the electrodes, dust entering an electric field space is charged, the dust respectively moves towards polar plates or polar lines with opposite polarities under the action of electric field force, and dust deposited on the polar plates or the polar lines flows along with a water film and is collected in a dust hopper to be discharged, so that the whole dust collecting process is realized.
In actual industrial production, the inlet flue gas of the wet electrostatic dust collector contains a large amount of SO2、SO3And the temperature of the flue gas is low and is generally below the acid dew point. The existing wet electrostatic precipitator adopts 316L or 2205 stainless steel materials for the dust collecting plate and the discharge electrode, and the materials are alkali corrosion resistant but acid corrosion resistant, so the existing wet electrostatic precipitator has the problems that the equipment is easy to corrode, the steel consumption is relatively large, the maintenance cost is high, and the like.
Commercially available wet electrostatic precipitators such as Hitachi and Mitsubishi protect internal components mainly by a water spray film, and the water collected from the water spray into the circulation tank and the drain tank contains a large amount of Cl-，SO3 2-,SO4 2-Plasma, in order to prevent the internal components of the wet electric precipitator from being corroded by acid, high-concentration alkali liquor, which is commonly used NaOH with 32% of mass concentration, is added into the circulating water tank and the drainage tank to neutralize the water quality, so that the aim of recycling the water is fulfilled. The technology not only consumes a large amount of alkali, but also has large maintenance amount and high operation cost.
Disclosure of Invention
The invention provides a wet electrostatic dust collection system adopting an alkali spraying technology, aiming at the problems that equipment is easy to be corroded by strong acid, the alkali consumption is large, the operation cost is high and the like.
The technical scheme of the wet electrostatic dust removal system is that the alkali spraying wet electrostatic dust remover comprises a shell, wherein a smoke inlet and a smoke outlet are oppositely formed in the horizontal direction of the shell, a dust collecting plate and a discharge electrode are arranged in the shell, the bottom of the shell is provided with an ash bucket, the smoke inlet and the smoke outlet are in a horn shape, a smoke channel is formed between the dust collecting plates, and the discharge electrode is arranged between the two dust collecting plates; the device also comprises a weak alkali liquor spraying device, one end of an alkali spraying pipe of the weak alkali liquor spraying device is connected with an alkali spraying nozzle, the alkali spraying nozzle is arranged in a flue gas inlet of the shell, an air flow uniform distribution plate is also arranged at the middle section of the flue gas inlet, the alkali spraying nozzle is over against the air flow uniform distribution plate, and a plurality of holes are distributed on the air flow uniform distribution plate; the water spraying device is characterized by further comprising a circulating water spraying device, wherein one end of a spraying water pipe of the circulating water spraying device is connected with a water spraying nozzle and is arranged at the top of the shell.
Preferably, a plurality of alkali spraying pipes are arranged at the flue gas inlet, a small-flow atomization alkali spraying nozzle is connected to one alkali spraying pipe, and the spraying direction of the weak alkali liquor and the flowing direction of the flue gas are kept in the same direction.
Preferably, the air flow uniform distribution plate is a stainless steel plate, and the holes are square holes or round holes.
Preferably, the flow direction of the flue gas is parallel to the flue gas channel formed between the dust collecting plates.
Preferably, the water spray nozzles of the circulating water spray device are arranged right above the dust collecting plate and correspond to the dust collecting plate one by one, the distance between every two adjacent water spray nozzles on a single spray header is equal to the distance between every two adjacent dust collecting plates, and the water spray nozzles of the spray header can spray the dust collecting plate and the discharge electrode simultaneously.
Preferably, the water spray nozzle of the circulating water spraying device is in a hollow conical shape.
Preferably, the circulating water spraying device controls the spraying of the dust collecting plate and the discharge electrode in a segmented manner, and the spraying intensity of the water nozzle close to the flue gas inlet is higher than that of the water nozzle close to the flue gas outlet.
Preferably, the ash bucket is equipped with anterior ash bucket and rear portion ash bucket according to the flue gas flow direction, and anterior ash bucket corresponds and sets up the drain tank, and the rear portion ash bucket corresponds and sets up circulation tank, and the waste liquid that the ash bucket was collected is discharged rather than corresponding drain tank or circulation tank, and the waste liquid that granule concentration is low in the drain tank overflows to circulation tank in, and the waste water that granule concentration is high in the drain tank is discharged by its lower part, but the direct retrieval and utilization of water in the circulation tank.
A spray alkali type wet electrostatic precipitator system, adopt any kind of spray alkali type wet electrostatic precipitator as aforesaid, another end of the spray alkali tube of the said weak alkali liquor spray set communicates with process water tank, there are process water pumps on the pipeline between spray alkali mouth and the process water tank, the said process water tank also communicates with alkali storage tank through the pipeline, there are alkali metering pumps on the pipeline between alkali storage tank and the process water tank, the said alkali metering pump controls the alkali liquor amount added into process water tank; and the other end of the spray water pipe of the circulating water spraying device is connected with the circulating water tank.
A spray alkali type wet-type electrostatic dust collection method, adopt spray alkali type wet-type electrostatic dust collection system as aforesaid, include (1) the flue gas of the flow velocity is in 15m/s is let in from the flue gas inlet of the body, distribute the board and distribute evenly through the airstream, make the flue gas flow velocity control in the wet-type electrostatic dust collector within 3 m/s; (2) controlling a process water pump according to the flow of the flue gas, and enabling the flue gas to be in complete contact with alkalescent process water through continuous spraying; (3) the discharge electrode is connected with a high-frequency pulse power supply, and the high energy generated by the discharge electrode enables the fine dust and the water mist in the flue gas to be electrically condensed into large-particle dust and move towards the dust collecting plate or the discharge electrode; (4) the circulating water continuously sprays the dust collecting plate and the discharge electrode through the circulating water pump so as to keep the water film continuously covering the components in the electrostatic dust collector; (5) the flue gas after dust removal is directly discharged into the atmosphere through a flue gas outlet; (6) the waste liquid generated by the operation of the equipment is collected in the ash hopper at the lower part of the shell, then flows into the circulating water tank, and can be directly recycled after being treated.
The invention has the following beneficial effects: 1. the spraying mechanism of the alkali spraying type wet electrostatic dust collector disclosed by the invention utilizes low-concentration alkali liquor to directly spray and add into the wet electrostatic dust collector in the same direction as flue gas, so that acidic substances in the flue gas are comprehensively neutralized, and the function of better protecting internal components is achieved. In addition, as the entering flue gas is in a neutral state, the complete continuous water film of the dust collecting plate is not required to be ensured for corrosion prevention, the water consumption for spraying is greatly saved, the alkali consumption is reduced, the operation cost is reduced, and the service life of the dust remover is prolonged.
2. The spraying mechanism of the alkali spraying type wet electrostatic dust removal system can better treat dust contained in the flue gas, so that the flue gas can be treated more completely, and meanwhile, the sewage in the sedimentation tank can be continuously recycled as the water supply of the spraying assembly after being filtered, so that the washing and spraying mechanism can realize the recycling of water, the zero emission of the waste water is realized, the water in the water storage tank can be recycled, and the energy-saving and environment-friendly effects are achieved.
Drawings
FIG. 1 is a schematic diagram of a wet electrostatic precipitator with alkali spraying according to the present invention.
Fig. 2 is a schematic view of a wet electrostatic precipitator of the alkali spray type according to the present invention.
FIG. 3 is a sectional view taken along line A-A of FIG. 2, which is a schematic view of an alkali spraying nozzle of a process water pipe of a weak alkali liquor spraying device of the alkali spraying wet electrostatic precipitator.
Fig. 4 is a sectional view taken along line B-B of fig. 2, which is a structural layout diagram of the water nozzles of the circulating water spray header of the alkali-spray wet electrostatic precipitator of the present invention.
Reference is made to the accompanying drawings in which: 1-flue gas inlet, 2-alkali spraying nozzle, 3-alkali spraying pipe, 4-shell, 5-dust collecting plate, 6-discharge electrode, 7-spray water pipe, 8-water spraying nozzle, 9-flue gas outlet, 10-ash bucket and 11-uniform distribution plate.
Detailed Description
As shown in figure 1, the alkali spraying type wet electrostatic dust removal system of the invention is schematically shown, and comprises a horizontally arranged wet electrostatic dust remover, and a weak alkali liquor spraying device and a circulating water spraying device which are connected with the wet electrostatic dust remover.
Referring to fig. 2, the wet electrostatic precipitator of the present invention is schematically shown, wherein a housing 4 of the precipitator is provided with a trumpet-shaped flue gas inlet 1 and a flue gas outlet 9 in a horizontal direction, an ash bucket 10 is arranged at the lower part of the housing, a dust collecting plate 5 is arranged in the housing, discharge electrodes 6 are arranged between the dust collecting plates, and a flue gas channel is formed between the dust collecting plates.
Referring to fig. 1 and 3, the weak alkali liquor spraying device of the wet electrostatic dust removal system of the invention is illustrated, one end of an alkali spraying pipe 3 of the weak alkali liquor spraying device is connected with an alkali spraying nozzle 2, the alkali spraying pipe is arranged in a flue gas inlet of a shell, and the other end of the alkali spraying pipe is communicated with a process water tank. The middle section of the flue gas inlet is also provided with an air flow uniform distribution plate 11, the alkali spraying nozzle is right opposite to the air flow uniform distribution plate, and a plurality of holes are distributed on the air flow uniform distribution plate. A process water pump is arranged on a pipeline between the process water tank and the alkali spraying nozzle, and the flow of the weak alkali liquor is controlled by the process water pump. The process water tank is also communicated with an alkali storage tank through a pipeline, an alkali metering pump is arranged on the pipeline between the process water tank and the alkali storage tank, and the alkali metering pump controls the amount of alkali liquid added into the process water tank.
Referring to fig. 1 and 4, a circulating water spraying device of a wet electrostatic dust collection system of the present invention is illustrated, wherein one end of a spraying water pipe 7 of the circulating water spraying device is also connected with a water nozzle 8 and arranged on the top of a housing, the other end of the spraying water pipe is communicated with a circulating water tank, and the bottom of the circulating water tank is connected with a drainage pump. And the spray water pipeline is provided with a circulating water pump and a self-cleaning filter, the circulating water pump is used for controlling the flow of circulating water, and the self-cleaning filter is used for cleaning the water quality of the circulating water. The water spray nozzles of the circulating water spray device are arranged right above the dust collecting plate and are in one-to-one correspondence with the dust collecting plate, the distance between every two adjacent water spray nozzles on a single spray header is equal to the distance between every two adjacent dust collecting plates, and the water spray nozzles of the spray header can spray the dust collecting plate and the discharge electrode simultaneously.
The working principle of the alkali spraying type wet electrostatic dust collector comprises the following steps: the flow velocity of the flue gas in the flue is generally 15m/s, the flue gas is introduced from a flue gas inlet of the shell and uniformly distributed through the gas flow uniform distribution plate, so that the flow velocity of the flue gas in the wet electrostatic dust collector is controlled within 3 m/s. According to the flow of the flue gas, a process water pump is controlled, the flue gas is completely contacted with alkalescent process water through continuous spraying, acidic ions in the flue gas and the alkalescent process water are subjected to chemical reaction to generate neutral water with the pH value of about 7, and therefore the problem of corrosion of internal elements of the wet electrostatic dust collector is thoroughly solved. The discharge electrode is connected with a high-frequency pulse power supply, and the high energy generated by the discharge electrode enables the fine dust and the water mist in the flue gas to be electrically condensed into large-particle dust and move towards the dust collecting plate or the discharge electrode. The circulating water continuously sprays the dust collecting plate and the discharge electrode through the circulating water pump to keep the water film continuously covering the internal components of the electrostatic dust collector, so that the acid corrosion is reduced. Flue gas particulate matter concentration after removing dust is less than 5mg/Nm, reaches ultralow emission requirement, directly discharges the atmosphere, and the waste liquid that equipment operation produced gathers in ash bucket 9 of casing lower part, later flows into circulation water tank, can directly recycle after handling.
Preferably, a plurality of alkali spraying pipes are arranged at the flue gas inlet section, a small-flow atomization alkali spraying nozzle is connected to a single alkali spraying pipe, the flow direction of flue gas is parallel to a flue gas channel formed between the dust collecting plates, and the spraying direction of weak alkali liquor is the same as the flow direction of flue gas. The air distribution plate is made of 316L stainless steel and is provided with a plurality of square holes or round holes.
Preferably, the water spray nozzle of the circulating water spray device is a hollow conical water spray nozzle, the spraying of the front dust collecting plate, the spraying of the rear dust collecting plate and the discharge electrode are controlled in a segmented mode by circulating water, and the spraying intensity of the water spray nozzle close to the flue gas inlet is higher than that of the water spray nozzle close to the flue gas outlet. The ash bucket sets up 2 at least according to the flue gas flow direction, and the ash bucket that is close to flue gas import department corresponds and sets up the drain tank, and the ash bucket nearest from flue gas exit corresponds and sets up 1 circulation tank, and the waste liquid that the ash bucket was collected emits into corresponding drain tank or circulation tank, and the drain tank is established ties in proper order through the pipeline with circulation tank. Most preferably, the ash bucket is equipped with anterior ash bucket and rear portion ash bucket, and the waste liquid ash content is generally less than 20% is collected to the rear portion ash bucket, and the granule is slight relatively, but discharges into circulation tank direct retrieval and utilization after handling, and the waste liquid ash content is big is collected to anterior ash bucket, and is coarse grain, and the drainage box is provided with the agitator and prevents that the particulate matter from deposiing, and the higher waste water of concentration discharges into user's water processing system or other recycling systems through the drain pump in drainage box lower part, and the lower liquid overflow of drainage box top concentration is to circulation tank.
The above description is only an embodiment of the present invention, but the technical features of the present invention are not limited thereto, and any changes or modifications within the technical field of the present invention by those skilled in the art are covered by the claims of the present invention.
Claims (10)
1. The utility model provides a spout alkali type wet electrostatic precipitator, includes the casing, and the relative division is equipped with flue gas inlet and export in the casing horizontal direction, is equipped with dust collecting plate and discharge electrode in the casing, and the casing bottom is ash bucket, its characterized in that: the smoke inlet and the smoke outlet are in a horn shape, a smoke channel is formed between the dust collecting plates, and the discharge electrode is arranged between the two dust collecting plates; the device also comprises a weak alkali liquor spraying device, one end of an alkali spraying pipe of the weak alkali liquor spraying device is connected with an alkali spraying nozzle, the alkali spraying nozzle is arranged in a flue gas inlet of the shell, an air flow uniform distribution plate is also arranged at the middle section of the flue gas inlet, the alkali spraying nozzle is opposite to the air flow uniform distribution plate, and a plurality of open holes are distributed on the air flow uniform distribution plate; the water spraying device is characterized by further comprising a circulating water spraying device, wherein one end of a spraying water pipe of the circulating water spraying device is connected with a water spraying nozzle and is arranged at the top of the shell.
2. The alkali-blasting wet electrostatic precipitator of claim 1, wherein: the flue gas inlet is provided with a plurality of alkali spraying pipes, a single alkali spraying pipe is connected with a small-flow atomization alkali spraying nozzle, and the spraying direction of the weak alkali liquor and the flowing direction of the flue gas are kept in the same direction.
3. The alkali-blasting wet electrostatic precipitator of claim 1, wherein: the gas flow uniform distribution plate is a stainless steel plate, and the holes are square holes or round holes.
4. The alkali-blasting wet electrostatic precipitator of claim 1, wherein: the flow direction of the flue gas is parallel to the flue gas channel formed between the dust collecting plates.
5. The alkali-blasting wet electrostatic precipitator of claim 1, wherein: the water spray nozzles of the circulating water spray device are arranged right above the dust collecting plate and are in one-to-one correspondence with the dust collecting plate, the distance between every two adjacent water spray nozzles on a single spray header is equal to the distance between every two adjacent dust collecting plates, and the water spray nozzles of the spray header can spray the dust collecting plate and the discharge electrode simultaneously.
6. The alkali-blasting wet electrostatic precipitator of claim 1, wherein: the water spray nozzle of the circulating water spray device is in a hollow conical shape.
7. The alkali-blasting wet electrostatic precipitator of claim 1, wherein: the circulating water spraying device controls the spraying of the dust collecting plate and the discharge electrode in a segmented mode, and the spraying intensity of the water spraying nozzle close to the flue gas inlet is higher than that of the water spraying nozzle close to the flue gas outlet.
8. The alkali-blasting wet electrostatic precipitator of claim 1, wherein: the ash bucket is equipped with anterior ash bucket and rear portion ash bucket according to the flue gas flow direction, and anterior ash bucket corresponds and sets up the drain tank, and the rear portion ash bucket corresponds and sets up circulation tank, and the waste liquid that the ash bucket was collected is discharged rather than corresponding drain tank or circulation tank, and the waste liquid that the particle concentration is low in the drain tank overflows to circulation tank in, and the waste water that the particle concentration is high in the drain tank is discharged by its lower part, but direct retrieval and utilization after handling of the water in the circulation tank.
9. The utility model provides a spout alkali type wet-type electrostatic precipitator system which characterized in that: the alkali spraying type wet electrostatic precipitator according to any one of claims 1 to 8, wherein the other end of the alkali spraying pipe of the weak alkali solution spraying device is communicated with a process water tank, a process water pump is arranged on a pipeline between the process water tank and the alkali spraying nozzle, the process water tank is also communicated with an alkali storage tank through a pipeline, an alkali metering pump is arranged on a pipeline between the process water tank and the alkali storage tank, and the alkali metering pump controls the amount of alkali solution added into the process water tank; and the other end of the spray water pipe of the circulating water spraying device is connected with the circulating water tank.
10. An alkali spraying type wet electrostatic dust collection method is characterized in that: the alkali spraying type wet electrostatic dust removal system of claim 9 is adopted, comprising (1) flue gas with the flow velocity of 15m/s is introduced from a flue gas inlet of a shell and is uniformly distributed through an air flow uniform distribution plate, so that the flow velocity of the flue gas in the wet electrostatic dust remover is controlled within 3 m/s; (2) controlling a process water pump according to the flow of the flue gas, and enabling the flue gas to be in complete contact with alkalescent process water through continuous spraying; (3) the discharge electrode is connected with a high-frequency pulse power supply, and the high energy generated by the discharge electrode enables the fine dust and the water mist in the flue gas to be electrically condensed into large-particle dust and move towards the dust collecting plate or the discharge electrode; (4) the circulating water continuously sprays the dust collecting plate and the discharge electrode through the circulating water pump so as to keep the water film continuously covering the components in the electrostatic dust collector; (5) the flue gas after dust removal is directly discharged into the atmosphere through a flue gas outlet; (6) the waste liquid generated by the operation of the equipment is collected in the ash hopper at the lower part of the shell, then flows into the circulating water tank, and can be directly recycled after being treated.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110138929.0A CN112844841A (en) | 2021-02-02 | 2021-02-02 | Alkali spraying type wet electrostatic dust removal system and process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110138929.0A CN112844841A (en) | 2021-02-02 | 2021-02-02 | Alkali spraying type wet electrostatic dust removal system and process |
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| CN112844841A true CN112844841A (en) | 2021-05-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113798062A (en) * | 2021-10-09 | 2021-12-17 | 上海奥威日化有限公司 | Sulfonated tail gas treatment method |
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