CN113750766A - Tail gas washing and absorbing device and method for mechanized clarifying tank - Google Patents
Tail gas washing and absorbing device and method for mechanized clarifying tank Download PDFInfo
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- CN113750766A CN113750766A CN202111113136.XA CN202111113136A CN113750766A CN 113750766 A CN113750766 A CN 113750766A CN 202111113136 A CN202111113136 A CN 202111113136A CN 113750766 A CN113750766 A CN 113750766A
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- 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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- 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
- B01D53/58—Ammonia
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/50—Inorganic acids
- B01D2251/506—Sulfuric acid
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention provides a tail gas washing and absorbing device and a tail gas washing and absorbing method for a mechanized clarifying tank. The principle of strong acid absorption of weak base is adopted, namely sulfuric acid is adopted as spray liquid to absorb ammonia gas, and the spray liquid for absorbing ammonia gas is gradually saturated along with the increase of concentration, and then can be discharged into a saturator in the ammonium sulfate coking process to produce ammonium sulfate products by adopting a crystallization method, so that the ammonium sulfate products are recycled. The device can high-efficiently handle mechanized clarifier exhaust emission problem, and operation and control are convenient, and easy to carry out can not cause safety problem and secondary pollution.
Description
Technical Field
The application belongs to the technical field of mechanized clarification tank equipment, and particularly relates to a tail gas washing and absorbing device and a tail gas washing and absorbing method for a mechanized clarification tank.
Background
The mechanical clarifying tank is mainly used for separating tar and ammonia water in condensate of a gas-liquid separator of a gas collecting pipe of the coke oven. The temperature of the condensate entering the clarifying tank is high (about 75 ℃), wherein ammonia gas is extremely volatile, and environmental pollution is caused. After the tar, the ammonia water and the tar slag enter the clarifying tank from the inlet pipe, the tar, the ammonia water and the tar slag are uniformly distributed on the upper part of a tar layer, the clarified ammonia water flows out through the overflow tank, the tar deposited on the lower part of the tank is led out through the liquid level regulator, and the tar slag deposited on the bottom of the tank is scraped by the scraper and is sent into the head slag discharge hopper extending forwards to be discharged.
In the prior art, a negative pressure collecting device is generally arranged for treating tail gas diffused by a mechanized clarifying tank, i.e. the diffused tail gas is controlled by a pressure regulating valve and is intensively introduced into a coke oven gas negative pressure pipeline for purification and recovery treatment, so that the problem of environmental pollution caused by field tail gas outdoor emission is solved, and the method is specifically shown in fig. 1. However, the mode of introducing the tail gas into the coke oven gas negative pressure pipeline has higher requirements on pressure control and oxygen content. Because the slag discharge port of the mechanized clarifying tank and two ends of the head of the scraper conveyor are open to the air, complete sealing cannot be achieved, and air is inevitably sucked into a gas pipeline along with tail gas. When oxygen in the air enters a gas pipeline to a certain limit, potential safety hazards of fire and explosion exist. In addition, ammonia gas is extremely corrosive and is absorbed into gas pipelines, corrodes pipelines and equipment, and causes leakage.
Therefore, there is a need to develop a treatment apparatus that can be effectively controlled and easily implemented to solve the above problems for the purpose of environmental emission.
Disclosure of Invention
The embodiment of the application aims to provide a tail gas washing and absorbing device and method for a mechanical clarifying tank, wherein the diffused tail gas is pumped into a washing tower with a cooling section and a filler area from bottom to top under the action of a draught fan, and after the diffused tail gas is in reverse contact with and interacts with spraying liquid from top to bottom, toxic and harmful components are absorbed and then are discharged to the air. The device can high-efficiently handle mechanized clarifier exhaust emission problem, and operation and control are convenient, and easy to carry out can not cause safety problem and secondary pollution.
In a first aspect, the embodiment of the application provides a tail gas washing and absorbing device for a mechanical clarifying tank, which comprises the mechanical clarifying tank, a washing tower and an induced draft fan; the scrubbing tower comprises a cooling section and a scrubbing section, the cooling section being located below the scrubbing section; the method is characterized in that the diffused tail gas in the mechanical clarifying tank passes through the washing tower from bottom to top from the bottom of the washing tower under the action of the induced draft fan; spraying liquid from top to bottom at the top of the washing tower, and discharging the diffused tail gas from the top of the washing tower after cooling and reverse interaction with the spraying liquid.
In the implementation process, the tail gas is absorbed by the spraying liquid. The main component of the tail gas is ammonia gas, which has strong corrosion action and seriously corrodes gas pipelines and equipment and must be carefully treated. In the scheme, strong acid is adopted to absorb weak base, namely sulfuric acid is adopted as spraying liquid to absorb ammonia gas. In fact, the configuration of the spray liquid is analyzed according to the acid-base characteristics of the components of the tail gas, and acid (or base) solution with a certain concentration is configured by utilizing the acid-base neutralization principle. When the tail gas is wholly acidic, the spraying liquid can be alkali liquor.
The temperature in the mechanical clarifying tank is high, and tail gas is easy to volatilize and escape. Adopt the draught fan to pass through the gas collecting pipe and collect, can guide the gas flow direction better, can utilize pressure regulating valve, quick action emergency valve, tail gas blow-off valve on the gas collecting pipe to control the switching simultaneously to the speed that tail gas passed through is adjusted to the power through control draught fan.
The diffused tail gas passes through the interior of the washing tower from bottom to top. A cooling section and a washing section are arranged in the washing tower, and the cooling section is positioned below the washing section. After the diffused tail gas enters the washing tower, the temperature of the diffused tail gas is high, and the diffused tail gas is in full contact and interaction with the spraying liquid after being cooled. The spraying liquid is sprayed from the top to the bottom of the washing tower, so that the spraying liquid can be fully contacted with the diffused tail gas in a reverse direction, and the purification treatment effect is good. And after toxic and harmful substances in the tail gas are absorbed by the spraying liquid, the toxic and harmful substances can be discharged from the top of the washing tower.
Furthermore, the upper section of the washing section is provided with polypropylene rosette packing, and the spray liquid absorbs and purifies the diffused tail gas in a packing area.
In the implementation process, the upper part of the washing tower is a washing section, the upper section of the washing section is provided with the polypropylene rosette packing, after the spray liquid enters the washing tower from the spray liquid inlet, the spray liquid firstly passes through the polypropylene rosette packing area, the polypropylene rosette packing can play a role in uniform gas-liquid distribution, and the spray liquid can be fully contacted with the diffused tail gas in the packing area. It should be noted that the polypropylene rosette packing is required to be appropriately dense at the upper section of the washing section, fill the cross-sectional area of the upper section of the washing section, and be provided with an appropriate thickness. Therefore, the gas channel is reserved, and meanwhile, the spray liquid can be fully and alternately contacted with the gas for absorption.
Furthermore, the draught fan is made of acid and alkali corrosion resistant materials, and the diffused tail gas is collected through the gas collecting pipe under the action of the draught fan and then sent into the washing tower to be treated, and then is discharged to the air.
In the implementation process, it is easy to understand that the diffused tail gas is particularly highly corrosive, and some tail gases are acidic and some tail gases are alkaline and are easy to corrode pipelines. In order to avoid various conditions after the draught fan is corroded, the draught fan is preferably made of acid and alkali corrosion resistant materials.
Further, the off-gas is cooled to 25-30 ℃ in the cooling section of the scrubber.
The temperature of the diffused tail gas is higher, about 50 ℃ after being collected from the mechanical clarifying tank, the acid-base neutralization is an exothermic reaction, and the chemical absorption temperature is preferably controlled to be 25-30 ℃ in order to improve the absorption efficiency. When the temperature of the diffused tail gas is too high, the tail gas is not beneficial to purification and absorption, and the service life of the polypropylene flower ring filler is influenced, and cooling treatment is needed when the tail gas is interacted with the spraying liquid.
Furthermore, the cooling section is arranged by adopting a hollow tube bundle, a tail gas channel is arranged in the tube, and a circulating cooling medium is arranged outside the tube;
preferably, the circulating cooling medium is water, and the water temperature is controlled to be 16-20 ℃.
In the implementation process, the cooling section of the washing tower is arranged by adopting a hollow tube bundle, a gas channel is arranged in the tube bundle, and tail gas enters the washing section from the cooling section from bottom to top. The periphery of the tube bundle, i.e. the area between the tube bundle and the outer wall of the cooling section, is a circulating cooling medium. The circulating cooling medium can be various cooling media commonly used in the industry, and industrial circulating water is adopted, the water temperature is controlled to be 16-20 ℃, and the tail gas with larger heat can be rapidly cooled to 25-30 ℃.
Further, the circulating cooling medium flows in from the upper section of the cooling section and flows out from the lower section of the cooling section.
In the implementation process, the circulating cooling medium flows in from the upper section of the cooling section and flows out from the lower section of the cooling section, and reversely exchanges with tail gas, so that heat exchange is facilitated.
Furthermore, the washing section upper segment outside is equipped with and fills material mouth and spray liquid entry, the washing section hypomere outside is equipped with the manhole.
And a filling port is arranged on the outer side of the upper section of the washing section, so that the polypropylene garland filler can be filled conveniently. The spraying liquid inlet is arranged, so that the spraying liquid passes through the filler area in the spraying process, and is conveniently and uniformly distributed and then fully interacted with gas. A manhole is arranged on the outer side of the lower section of the washing section, and the manhole is used for conveniently observing the opening during shutdown and maintenance.
Furthermore, the washing tower is provided with a base, a spraying liquid supplement port is arranged on the outer side of the base, and the spraying liquid sprayed from the top of the washing tower is discharged from a vent port of the base after interaction with the diffused tail gas.
The washing tower is also provided with a base, and the base bears the cooling section and the washing section. The outer side of the base is provided with a spraying liquid supplementing inlet which leads to a spraying liquid inlet at the upper section of the washing section along with a pipeline. And a vent hole is formed in the outer side of the base, and after the spray liquid sprayed from the top of the washing tower is interacted with the diffused tail gas, the spray liquid is discharged into an ammonium sulfate mother liquor underground tank from the vent hole of the base. In fact, the spraying liquid can be circulated, namely the spraying liquid can be returned to the spraying liquid supplementing port for recycling after being sprayed from top to bottom. When the spray liquid (ammonium sulfate rich liquid) absorbing ammonia gas gradually reaches saturation along with the increase of concentration, the spray liquid can be discharged into a saturator in the ammonium sulfate coking process to produce ammonium sulfate products by adopting a crystallization method, and the spray liquid at a spray liquid supplement inlet needs to be replaced periodically.
Further, the spraying liquid is a 5% dilute sulfuric acid solution.
In the implementation process, the main component of tail gas of the mechanical clarifying tank is ammonia gas, and strong acid is adopted to absorb weak base in the scheme, namely sulfuric acid is adopted as spraying liquid to absorb ammonia gas. In fact, the configuration of the spray liquid is analyzed according to the acid-base characteristics of the components of the tail gas, and acid (or base) solution with a certain concentration is configured by utilizing the acid-base neutralization principle. When the tail gas is wholly acidic, the spraying liquid can be alkali liquor.
In a second aspect, the embodiment of the present application provides a tail gas washing and absorbing method, which is used for washing and absorbing tail gas of a mechanical clarifier, wherein the method adopts the above tail gas washing and absorbing device of the mechanical clarifier, and includes the following steps:
step S1: tail gas of the mechanical clarifying tank is collected by a gas collecting pipe under the action of the induced draft fan and then is sent into a washing tower;
step S2: after entering from the bottom of the washing tower, the diffused tail gas is cooled to 25-30 ℃ in a cooling section by a circulating cooling medium and then enters a washing section of the washing tower;
step S3: in the area of the upper section of the washing section filled with the polypropylene rosette packing, spraying liquid is used for absorbing and purifying the diffused tail gas;
step S4: the purified diffused tail gas is discharged to the air through a draught fan, and the spray liquid after interaction with the diffused tail gas is discharged into an ammonium sulfate mother liquor underground tank from a vent hole of a base of the washing tower.
Has the advantages that:
in the implementation process, the invention provides a tail gas washing and absorbing device and a tail gas washing and absorbing method for a mechanical clarifying tank. The strong acid absorption weak base is adopted in the scheme, namely, sulfuric acid is adopted as spraying liquid to absorb ammonia gas, the spraying liquid (ammonium sulfate rich liquid) for absorbing the ammonia gas is gradually saturated along with the increase of the concentration, and then the spraying liquid can be discharged into a coking ammonium sulfate process saturator to produce ammonium sulfate products by adopting a crystallization method, so that the recycling is realized. The device can high-efficiently handle mechanized clarifier exhaust emission problem, and operation and control are convenient, and easy to carry out can not cause safety problem and secondary pollution.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
FIG. 1 is a prior art flow diagram of a negative pressure tail gas collection device vented by a mechanized clarifier.
FIG. 2 is a flow chart of the tail gas washing and absorbing device of the mechanized clarifier of the present application.
FIG. 3 is a schematic structural view of a tail gas washing and absorbing device of a mechanical clarifier.
FIG. 4 is a schematic diagram of the structure of the scrubbing section of the scrubber according to the embodiment of the present application.
FIG. 5 is a schematic diagram of a cooling section of a scrubber according to an embodiment of the present disclosure.
Wherein, each reference mark is 1-spraying liquid supplement port; 2-a tail gas diffusing inlet; 3-outlet of cooling medium; 4-cooling medium inlet; 5-a manhole; 6-filling material port; 7-spraying liquid inlet; 8-a tail gas diffusion outlet; 9-a vent; a-a base; b-a cooling section; c-a washing section; d-the filler region.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when in use, and are used only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Examples
Referring to fig. 2-3, the embodiment of the application provides a tail gas washing and absorbing device for a mechanical clarifying tank, which comprises the mechanical clarifying tank, a washing tower and an induced draft fan; the washing tower comprises a cooling section b and a washing section c, wherein the cooling section b is positioned below the washing section c; the method is characterized in that the diffused tail gas in the mechanical clarifying tank passes through the washing tower from bottom to top from a diffused tail gas inlet 2 at the bottom of the washing tower under the action of the induced draft fan; spraying liquid from top to bottom at the top of the washing tower, and discharging the diffused tail gas from the top of the washing tower after cooling and reverse interaction with the spraying liquid.
The upper section of the washing section c is filled with polypropylene rosette packing, and the polypropylene rosette packing area is in an area d in fig. 3, is specifically arranged as indicated by arrow directions in fig. 4 and is in a round shape with ordered density. And the spraying liquid absorbs and purifies the diffused tail gas in the filler area d. The induced draft fan selects acid and alkali corrosion resistant material, the tail gas that diffuses is in under the effect of induced draft fan is sent into the scrubbing tower after collecting through the gas collecting pipe and is handled the back and discharge from diffusing tail gas export 8.
The diffused tail gas is cooled to 25-30 ℃ in the cooling section b of the washing tower. The cooling section is arranged by adopting a hollow tube bundle, a tail gas channel is arranged in the tube, and a circulating cooling medium is arranged outside the tube; the specific arrangement is shown in figure 5. Preferably, the circulating cooling medium is water, and the water temperature is controlled to be 16-20 ℃. The circulating cooling medium flows in from the upper section of the cooling section and flows out from the lower section of the cooling section.
The washing section upper segment outside is equipped with and fills material mouth 6 and spray liquid entry 7, the washing section hypomere outside is equipped with manhole 5. The washing tower is provided with a base a, a spraying liquid supplement port 1 is arranged on the outer side of the base a, and spraying liquid sprayed from the top of the washing tower is discharged from a vent 9 of the base after interaction with the diffused tail gas. The outer side of the upper section of the cooling section is provided with a cooling medium inlet 4, and the outer side of the lower section of the cooling section is provided with a cooling medium outlet 3. The spraying liquid is a 5% dilute sulfuric acid solution.
In the implementation process, the tail gas is absorbed by the spraying liquid. The main component of the tail gas is ammonia gas, which has strong corrosion action and seriously corrodes gas pipelines and equipment and must be carefully treated. In the scheme, strong acid is adopted to absorb weak base, namely sulfuric acid is adopted as spraying liquid to absorb ammonia gas. In fact, the configuration of the spray liquid is analyzed according to the acid-base characteristics of the components of the tail gas, and acid (or base) solution with a certain concentration is configured by utilizing the acid-base neutralization principle. When the tail gas is wholly acidic, the spraying liquid can be alkali liquor.
The temperature in the mechanical clarifying tank is high, and tail gas is easy to volatilize and escape. Adopt the draught fan to pass through the gas collecting pipe and collect, can guide the gas flow direction better, can utilize pressure regulating valve, quick action emergency valve, tail gas blow-off valve on the gas collecting pipe to control the switching simultaneously to the speed that tail gas passed through is adjusted to the power through control draught fan.
The diffused tail gas passes through the interior of the washing tower from bottom to top through a diffused tail gas inlet 2 at the bottom of the washing tower. A cooling section and a washing section are arranged in the washing tower, and the cooling section is positioned below the washing section. After the diffused tail gas enters the washing tower, the temperature of the diffused tail gas is high, and the diffused tail gas is in full contact and interaction with the spraying liquid after being cooled. The spraying liquid is sprayed from the top to the bottom of the washing tower, so that the spraying liquid can be fully contacted with the diffused tail gas in a reverse direction, and the purification treatment effect is good. And after toxic and harmful substances in the tail gas are absorbed by the spraying liquid, the toxic and harmful substances can be discharged from the top of the washing tower.
In the implementation process, the upper part of the washing tower is a washing section, the upper section of the washing section is provided with the polypropylene rosette packing, after the spray liquid enters the washing tower from the spray liquid inlet, the spray liquid firstly passes through the polypropylene rosette packing area, the polypropylene rosette packing can play a role in uniform gas-liquid distribution, and the spray liquid can be fully contacted with the diffused tail gas in the packing area. It should be noted that the polypropylene rosette packing is required to be appropriately dense at the upper section of the washing section, fill the cross-sectional area of the upper section of the washing section, and be provided with an appropriate thickness. Therefore, the gas channel is reserved, and meanwhile, the spray liquid can be fully and alternately contacted with the gas for absorption.
In the implementation process, it is easy to understand that the diffused tail gas is particularly highly corrosive, and some tail gases are acidic and some tail gases are alkaline and are easy to corrode pipelines. In order to avoid various conditions after the draught fan is corroded, the draught fan is preferably made of acid and alkali corrosion resistant materials.
The temperature of the diffused tail gas is higher, about 50 ℃ after being collected from the mechanical clarifying tank, the acid-base neutralization is an exothermic reaction, and the chemical absorption temperature is preferably controlled to be 25-30 ℃ in order to improve the absorption efficiency. When the temperature of the diffused tail gas is too high, the tail gas is not beneficial to purification and absorption, and the service life of the polypropylene flower ring filler is influenced, and cooling treatment is needed when the tail gas is interacted with the spraying liquid.
In the implementation process, the cooling section of the washing tower is arranged by adopting a hollow tube bundle, a gas channel is arranged in the tube bundle, and tail gas enters the washing section from the cooling section from bottom to top. The periphery of the tube bundle, i.e. the area between the tube bundle and the outer wall of the cooling section, is a circulating cooling medium. The circulating cooling medium can be various cooling media commonly used in the industry, and industrial circulating water is adopted, the water temperature is controlled to be 16-20 ℃, and the tail gas with larger heat can be rapidly cooled to 25-30 ℃.
In the implementation process, the circulating cooling medium flows in from the upper section of the cooling section and flows out from the lower section of the cooling section, and reversely exchanges with tail gas, so that heat exchange is facilitated.
And a filling port is arranged on the outer side of the upper section of the washing section, so that the polypropylene garland filler can be filled conveniently. The spraying liquid inlet is arranged, so that the spraying liquid passes through the filler area in the spraying process, and is conveniently and uniformly distributed and then fully interacted with gas. A manhole is arranged on the outer side of the lower section of the washing section, and the manhole is used for conveniently observing the opening during shutdown and maintenance.
The washing tower is also provided with a base, and the base bears the cooling section and the washing section. The outer side of the base is provided with a spraying liquid supplementing inlet which leads to a spraying liquid inlet at the upper section of the washing section along with a pipeline. And a vent hole is formed in the outer side of the base, and after the spray liquid sprayed from the top of the washing tower is interacted with the diffused tail gas, the spray liquid is discharged into an ammonium sulfate mother liquor underground tank from the vent hole of the base. In fact, the spraying liquid can be circulated, namely the spraying liquid can be returned to the spraying liquid supplementing port for recycling after being sprayed from top to bottom. When the spray liquid (ammonium sulfate rich liquid) absorbing ammonia gas gradually reaches saturation along with the increase of concentration, the spray liquid can be discharged into a saturator in the ammonium sulfate coking process to produce ammonium sulfate products by adopting a crystallization method, and the spray liquid at a spray liquid supplement inlet needs to be replaced periodically.
In the implementation process, the main component of tail gas of the mechanical clarifying tank is ammonia gas, and strong acid is adopted to absorb weak base in the scheme, namely sulfuric acid is adopted as spraying liquid to absorb ammonia gas. In fact, the configuration of the spray liquid is analyzed according to the acid-base characteristics of the components of the tail gas, and acid (or base) solution with a certain concentration is configured by utilizing the acid-base neutralization principle. When the tail gas is wholly acidic, the spraying liquid can be alkali liquor.
In a second aspect, the embodiment of the present application provides a tail gas washing and absorbing method, which is used for washing and absorbing tail gas of a mechanical clarifier, wherein the method adopts the above tail gas washing and absorbing device of the mechanical clarifier, and includes the following steps:
step S1: tail gas of the mechanical clarifying tank is collected by a gas collecting pipe under the action of the induced draft fan and then is sent into a washing tower;
step S2: after entering from the bottom of the washing tower, the diffused tail gas is cooled to 25-30 ℃ in a cooling section by a circulating cooling medium and then enters a washing section of the washing tower;
step S3: in the area of the upper section of the washing section filled with the polypropylene rosette packing, spraying liquid is used for absorbing and purifying the diffused tail gas;
step S4: the purified diffused tail gas is discharged to the air through a draught fan, and the spray liquid after interaction with the diffused tail gas is discharged into an ammonium sulfate mother liquor underground tank from a vent hole of a base of the washing tower.
The tail gas is pumped into a washing tower with a cooling section and a filling area from bottom to top under the action of a draught fan, and is in reverse contact with and interacted with spraying liquid from top to bottom, and toxic and harmful components are absorbed and then discharged to the air. The strong acid absorption weak base is adopted in the scheme, namely, sulfuric acid is adopted as spraying liquid to absorb ammonia gas, the spraying liquid (ammonium sulfate rich liquid) for absorbing the ammonia gas is gradually saturated along with the increase of the concentration, and then the spraying liquid can be discharged into a coking ammonium sulfate process saturator to produce ammonium sulfate products by adopting a crystallization method, so that the recycling is realized. The device can high-efficiently handle mechanized clarifier exhaust emission problem, and operation and control are convenient, and easy to carry out can not cause safety problem and secondary pollution.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A tail gas washing and absorbing device of a mechanical clarifying tank comprises the mechanical clarifying tank, a washing tower and a draught fan;
the scrubbing tower comprises a cooling section and a scrubbing section, the cooling section being located below the scrubbing section;
the method is characterized in that the diffused tail gas in the mechanical clarifying tank passes through the washing tower from bottom to top from the bottom of the washing tower under the action of the induced draft fan;
spraying liquid from top to bottom at the top of the washing tower, and discharging the diffused tail gas from the top of the washing tower after cooling and reverse interaction with the spraying liquid.
2. The tail gas washing and absorbing device as claimed in claim 1, wherein the upper section of the washing section is provided with polypropylene rosette packing, and the spray liquid is used for absorbing and purifying the diffused tail gas in a packing area.
3. The tail gas washing and absorbing device of claim 2, wherein the induced draft fan is made of acid and alkali corrosion resistant material, and the diffused tail gas is collected by the gas collecting pipe under the action of the induced draft fan, sent to the washing tower for treatment and then discharged.
4. The tail gas scrubbing and absorbing device according to claim 3, wherein the diffused tail gas is cooled to 25-30 ℃ in the cooling section of the scrubber.
5. The tail gas washing and absorbing device according to claim 4, wherein the cooling section is arranged by adopting a hollow tube bundle, a tail gas channel is arranged in the tube, and a circulating cooling medium is arranged outside the tube;
preferably, the circulating cooling medium is water, and the water temperature is controlled to be 16-20 ℃.
6. The tail gas scrubbing and absorbing device according to claim 5, wherein said circulating cooling medium flows in from an upper section of said cooling section and flows out from a lower section of said cooling section.
7. The tail gas washing and absorbing device of claim 6, wherein a filling port and a spraying liquid inlet are arranged on the outer side of the upper section of the washing section, and a manhole is arranged on the outer side of the lower section of the washing section.
8. The tail gas washing and absorbing device as claimed in claim 7, wherein the washing tower is provided with a base, a spraying liquid supply port is arranged outside the base, and spraying liquid sprayed from the top of the washing tower is discharged from a vent port of the base after interacting with the diffused tail gas.
9. The tail gas washing and absorbing device according to claim 8, wherein the spray liquid is a 5% dilute sulfuric acid solution.
10. A method for washing and absorbing tail gas, which is used for washing and absorbing tail gas of a mechanized clarifier tank, wherein the method adopts the device of claim 9, and comprises the following steps:
step S1: tail gas of the mechanical clarifying tank is collected by a gas collecting pipe under the action of the induced draft fan and then is sent into a washing tower;
step S2: after entering from the bottom of the washing tower, the diffused tail gas is cooled to 25-30 ℃ in a cooling section by a circulating cooling medium and then enters a washing section of the washing tower;
step S3: in the area of the upper section of the washing section filled with the polypropylene rosette packing, spraying liquid is used for absorbing and purifying the diffused tail gas;
step S4: the purified diffused tail gas is discharged to the air through a draught fan, and the spray liquid after interaction with the diffused tail gas is discharged into an ammonium sulfate mother liquor underground tank from a vent hole of a base of the washing tower.
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| CN202111113136.XA CN113750766A (en) | 2021-09-18 | 2021-09-18 | Tail gas washing and absorbing device and method for mechanized clarifying tank |
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