CN210522142U - Phthalic anhydride tail gas purification treatment system - Google Patents
Phthalic anhydride tail gas purification treatment system Download PDFInfo
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- CN210522142U CN210522142U CN201921121643.6U CN201921121643U CN210522142U CN 210522142 U CN210522142 U CN 210522142U CN 201921121643 U CN201921121643 U CN 201921121643U CN 210522142 U CN210522142 U CN 210522142U
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Abstract
The utility model provides a phthalic anhydride tail gas cleanerThe chemical treatment system comprises a heat storage oxidation system or a catalytic oxidation system and is used for oxidizing organic matters in the phthalic anhydride tail gas; a desulfurization system connected with the heat storage or catalytic oxidation system and used for removing SO from the oxidized tail gas2Processing; the filter pressing system is connected with the desulfurization system and is used for carrying out filter pressing treatment on the desulfurization solution containing gypsum in the desulfurization system; the desulfurization mother liquor treatment system is connected with the filter pressing system and is used for treating the desulfurization mother liquor after filter pressing; a wet electrostatic dust removal system connected with the desulfurization system for removing SO2Carrying out electrostatic dust removal treatment on the tail gas; and the white feather elimination system is connected with the wet electrostatic dust removal system and is used for eliminating white feather of the tail gas subjected to electrostatic dust removal. The utility model provides a tail gas pollution problem in the phthalic anhydride production process, pollutant discharges into the atmosphere with the concentration that is less than national ultra-low emission standard 14.1% -50% in the tail gas after the purification, really accomplishes cleaner production.
Description
Technical Field
The utility model belongs to the tail gas clean-up field especially relates to a phthalic anhydride tail gas clean-up processing system.
Background
Phthalic anhydride is an important basic organic chemical raw material, is the second largest anhydride in the world, is widely applied to industrial departments such as chemical industry, medicine, electronics, agriculture, coating, fine chemical industry and the like at present, and is an important organic chemical raw material.
The industrial production of phthalic anhydride has two routes of raw materials: one is a process route (ortho method for short) using ortho-xylene as a raw material, and the other is a process route (naphthalene method for short) using industrial naphthalene as a raw material. The fixed bed industrial naphthalene method for preparing phthalic anhydride is a technology which is started in recent years, and the price difference between the industrial naphthalene and the o-xylene is large because the price of the o-xylene is increased and the price of the industrial naphthalene is decreased, so that the production competitiveness of the phthalic anhydride by the naphthalene method is greatly improved.
In order to solve the problem of environmental pollution of the phthalic anhydride tail gas, most tail gas of a naphthalene method phthalic anhydride production device is treated by heat storage or catalytic incineration, and the incinerated phthalic anhydride tail gas contains higher SO2Particulate matter and small amounts of SO3The like, seriously pollute air and contain particles and SO3PM2.5 is easy to generate, and haze and environmental pollution are caused.
To solve the above problemsSubject, the utility model of the application adopts the lime gypsum method to remove SO2But in the removal of SO2In the process, the problem of colored smoke plume pollution is generated, and the macroscopic 'desulfurization tail trace' is mainly primary fine particles (including smoke dust and desulfurization slurry) and SO carried by the desulfurized tail gas3The secondary sulfate aerosol formed, results in a secondary PM of 2.5.
SUMMERY OF THE UTILITY MODEL
In view of the above problems in the prior art, an object of the embodiments of the present invention is to provide a phthalic anhydride tail gas purification treatment system, which includes:
the thermal storage oxidation system or the catalytic oxidation system is used for oxidizing organic matters in the phthalic anhydride tail gas;
the desulfurization system is connected with the heat storage oxidation system or the catalytic oxidation system and is used for removing SO from the tail gas oxidized by the heat storage oxidation system or the catalytic oxidation system2Processing;
the filter pressing system is connected with the desulfurization system and is used for carrying out filter pressing treatment on the desulfurization solution containing gypsum in the desulfurization system;
the desulfurization mother liquor treatment system is connected with the filter pressing system and is used for treating desulfurization mother liquor generated after filter pressing;
a wet electrostatic dust removal system connected with the desulfurization system and used for removing SO in the desulfurization system2Carrying out electrostatic dust removal treatment on the tail gas;
and the white feather elimination system is connected with the wet electrostatic dust removal system and is used for eliminating white feather of the tail gas subjected to electrostatic dust removal.
In some embodiments, the regenerative oxidation system comprises:
the reaction chamber is internally provided with a gas distribution unit, a heat storage chamber and an oxidation chamber which are communicated in sequence from bottom to top, a gas inlet of the gas distribution unit is connected with a tail gas feeding pipe, a gas outlet of the gas distribution unit is connected with the desulfurization system through a first pipeline, and the oxidation chamber is connected with the desulfurization system through a second pipeline;
the tail gas heater is arranged on the tail gas feeding pipe and used for heating tail gas;
and the waste heat boiler is arranged on the second pipeline and is used for recovering the redundant heat contained in the oxidation process in the oxidation chamber.
In some embodiments, the desulfurization system comprises:
the first pipeline and the second pipeline are connected to the top of the desulfurization tower;
the circulating pump is connected to the desulfurizing tower and used for conveying the lime slurry in the bottom of the desulfurizing tower to the top of the desulfurizing tower SO that the tail gas entering the desulfurizing tower is fully contacted with the lime slurry to remove SO2；
A demisting tower; which is connected with the middle lower part of the desulfurizing tower through a third pipeline SO as to remove SO2And the tail gas enters the demisting tower for demisting treatment.
In some embodiments, the desulfurization system further comprises a lime slurry preparation device connected with the lower part of the desulfurization tower through a suction pump to convey the lime slurry therein into the desulfurization tower; and a plurality of stirring paddles positioned in the lime slurry are arranged in the desulfurizing tower.
In some embodiments, the pressure filtration system comprises:
the membrane plate-and-frame filter press is connected with the bottom of the desulfurization tower through a fourth pipeline, a filter pressing feeding pump is arranged on the fourth pipeline, and the filter pressing feeding pump is used for conveying the desulfurization liquid containing gypsum in the desulfurization tower to the membrane plate-and-frame filter press;
the hydraulic system is connected with the membrane plate-and-frame filter press and is used for driving the plate-and-frame of the membrane plate-and-frame filter press to move so as to enable the membrane plate-and-frame filter press to contain desulfurization liquid containing gypsum or discharge squeezed solid gypsum;
and the squeezing system is connected with the membrane plate and frame filter press and is used for providing squeezing pressure for the membrane plate and frame filter press.
In some embodiments, the desulfurization mother liquor treatment system comprises:
the mother liquor pool is connected with the filter pressing system and is used for containing desulfurization mother liquor generated after filter pressing of the filter pressing system;
the spray drying tower is connected with an air pipeline used for introducing atomizing air into the lower part of the spray drying tower;
and the dust remover is connected to the top of the spray drying tower and is used for removing dust from the tail gas containing the particulate matters discharged from the top of the spray drying tower.
In some embodiments, the desulfurization mother liquor treatment system further comprises:
the induced draft fan is connected with the dust remover so as to send the gas in the dust remover into the first pipeline and enter the desulfurizing tower; and/or
And the inlet of the tail gas mixing chamber is connected with the oxidation chamber through a fifth pipeline and is connected with the first pipeline through a sixth pipeline, and the outlet of the tail gas mixing chamber is connected with the bottom of the spray drying tower through a seventh pipeline so that the mixed tail gas enters the spray drying tower to dry the atomized desulfurization mother liquor in the spray drying tower.
In some embodiments, the wet electrostatic precipitator system comprises:
the lower end inlet of the electrostatic dust collector is connected with the top of a demisting tower of the desulfurization system so that demisted tail gas enters the electrostatic dust collector, a cathode wire and an anode tube are arranged in the electrostatic dust collector, and the cathode wire and the anode tube adsorb dust in the tail gas when the electrostatic dust collector is electrified;
and the wet electric washing system is arranged above the electrostatic dust collector and used for spraying water into the electrostatic dust collector so as to wash away the dust attached to the cathode wire and the anode tube.
In some embodiments, the white feather elimination system comprises a tower body, a condenser, a demister and a heater are sequentially arranged in the tower body from bottom to top, the lower end of the tower body is connected with an outlet at the upper end of the electrostatic dust collector, so that tail gas subjected to electrostatic dust collection enters the tower body, and the upper end of the tower body is connected with a chimney.
In some embodiments, the wet electrostatic dust removal system further comprises a water storage tank, wherein the water storage tank is connected with the lower water outlet of the electrostatic dust remover so as to contain condensed water; the water storage tank pass through the eighth pipeline with the tower body intercommunication, in order with the comdenstion water in the water storage tank is carried to in the tower body, be used for washing the defroster.
Compared with the prior art, the embodiment of the utility model provides a phthalic anhydride tail gas clean-up processing system and phthalic anhydride tail gas clean-up processing method have solved the exhaust pollution problem in the phthalic anhydride production process systematically, and the pollutant discharges into the atmosphere with the concentration that is less than national ultra-low emission standard 14.1% -50% in the tail gas after the purification, really accomplishes clean production.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention.
The summary of various implementations or examples of the technology described in this disclosure is not a comprehensive disclosure of the full scope or all features of the disclosed technology.
Drawings
In the drawings, which are not necessarily drawn to scale, like reference numerals may describe similar components in different views. Like reference numerals having letter suffixes or different letter suffixes may represent different instances of similar components. The drawings illustrate various embodiments, by way of example and not by way of limitation, and together with the description and claims, serve to explain the embodiments of the invention. The same reference numbers will be used throughout the drawings to refer to the same or like parts, where appropriate. Such embodiments are illustrative, and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.
Fig. 1 is a schematic view of a phthalic anhydride tail gas purification treatment system according to an embodiment of the present invention.
Fig. 2 is a flow chart of the phthalic anhydride tail gas purification treatment process of the embodiment of the utility model.
Figure 3 is a plot of the saturation moisture content of wet flue gas at atmospheric pressure versus the saturation temperature of the flue gas.
Reference numerals:
1-regenerative thermal oxidation system; 2-a desulfurization system; 3-a filter pressing system; 4-a desulfurization mother liquor treatment system; 5-a wet electrostatic dust removal system; 6-white feather elimination system; 7-an oxidation chamber; 8-a regenerator; 9-a gas distribution unit; 10-tail gas feed pipe; 11-a tail gas heater; 12-a waste heat boiler; 13-a first conduit; 14-a second conduit; 15-a burner; 16-a back pumping system; 17-a desulfurization tower; 18-a circulation pump; 19-a demisting tower; 20-a third line; 21-lime slurry preparation device; 22-a suction pump; 23-a stirring paddle; 24-diaphragm plate and frame filter press; 25-a hydraulic system; 26-a press system; 27-a fourth line; 28-filter pressing feed pump; 29-mother liquor pool; 30-a spray drying tower; 31-a dust remover; 32-air line; 33-a tail gas mixing chamber; 34-a fifth pipeline; 35-a sixth pipeline; 36-a seventh conduit; 37-a draught fan; 38-an electrostatic precipitator; 39-wet electric flushing system; 40-a condensate storage system; 41-tower body; 42-a condenser; 43-a demister; 44-a heater; 45-chimney; 46-eighth line.
Detailed Description
In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined below to clearly and completely describe the technical solution of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. The use of "first," "second," and similar terms in the description herein do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
To maintain the following description of the embodiments of the present invention clear and concise, detailed descriptions of well-known functions and components may be omitted.
As shown in figure 1, the embodiment of the utility model provides a phthalic anhydride tail gas clean-up processing system, it includes heat accumulation oxidation system 1 or catalytic oxidation system, desulfurization system 2, filter-pressing system 3, desulfurization mother liquor processing system 4, wet electrostatic precipitator system 5 and white feather system 6 that disappears, phthalic anhydride tail gas at first gets into heat accumulation oxidation system 1 or catalytic oxidation system, makes organic matter heat accumulation oxidation or catalytic oxidation in the phthalic anhydride tail gas be SO2、CO2And H2O, etc.; containing SO after oxidation2The tail gas enters a desulfurization system 2 to remove harmful gas SO2And reacted to form GaSO3Solution of GaSO3The desulfurization solution is oxidized into GaSO by air4I.e. a gypsum solution; the gypsum solution enters a filter pressing system 3 for filter pressing, solid gypsum is separated, and the solid gypsum can be sent to a cement plant to be used as a setting regulator; the desulfurization mother liquor after the gypsum is removed by filter pressing enters a desulfurization mother liquor treatment system 4 for drying treatment, dissolved salts and COD (chemical oxygen demand) in the desulfurization mother liquor are solidified and carbonized into dust particles, and mixed tail gas containing water vapor and the dust particles enters a dust remover 31 to remove the dust particles and then can be directly discharged if the mixed tail gas reaches the discharge standard, or enters a desulfurization system 2 again for further washing and purification treatment; SO removal in desulfurization system 22The tail gas enters a wet electrostatic dust removal and white feather elimination system 6 to remove particles and water in the tail gas to reach the temperature of-8 DEG CThe above effects of no white smoke can remove visual pollution. Through the utility model discloses pollutant is discharged into the atmosphere with the concentration that is less than national ultralow emission standard 25% -50% in the tail gas after phthalic anhydride tail gas clean-up processing system purifies, really accomplishes cleaner production, has systematically solved the tail gas pollution problem in the phthalic anhydride production process.
Both the thermal storage oxidation system 1 and the catalytic oxidation system can be used for oxidizing organic matters in the phthalic anhydride tail gas into SO2、CO2And H2O, etc. as shown in fig. 1, in the embodiment, a thermal storage oxidation system 1 is used for oxidizing the phthalic anhydride tail gas, where the thermal storage oxidation system 1 includes a reaction chamber, a tail gas heater 11 and a waste heat boiler 12, a gas distribution unit 9, a thermal storage chamber 8 and an oxidation chamber 7 which are communicated with each other are sequentially arranged in the reaction chamber from bottom to top, a gas inlet of the gas distribution unit 9 is connected to a tail gas feeding pipe 10, a gas outlet of the gas distribution unit 9 is connected to the desulfurization system 2 through a first pipeline 13, and the oxidation chamber 7 is connected to the desulfurization system 2 through a second pipeline 14; the tail gas heater 11 is arranged on the tail gas feeding pipe 10; the exhaust-heat boiler 12 is arranged on the second pipeline 14; the phthalic anhydride tail gas enters the gas distribution unit 9 through the tail gas feed pipe 10 and is heated by the tail gas heater 11, for example, the phthalic anhydride tail gas at about 85 ℃ is heated to about 130 ℃ to prevent low-temperature substances from crystallizing out and blocking the regenerator 8, the heated phthalic anhydride tail gas enters the regenerator 8 through the gas distribution unit 9 and enters the oxidation chamber 7 after being heated, the phthalic anhydride tail gas is subjected to oxidative decomposition at 850-950 ℃ in the oxidation chamber 7, and the oxidative decomposition product is SO2、CO2And H2O, and the like, after the phthalic anhydride tail gas is oxidized, the decomposed gas enters the heat storage chamber 8 again to store heat for ceramics (the heat storage chamber 8 is made of ceramics), enters the first pipeline 13 through the gas outlet of the gas distribution unit 9, and is conveyed to the desulfurization system 2 for subsequent treatment; if the decomposed gas contains redundant heat, the redundant heat contained in the oxidation process in the oxidation chamber can be recovered by the waste heat boiler 12, so that the boiler generates steam with the pressure of 0.8-1.5MPa, and finally the temperature of tail gas is reduced to 160-180 ℃ and then enters the desulfurization system 2.
With continued reference to fig. 1, a burner 15 is connected to the oxidation chamber 7, and the burner 15 is used for providing initial heat when the regenerative oxidation system 1 is in operation, so as to raise the temperature in the oxidation chamber 7 to about 800 ℃; the gas distribution unit 9 is further connected with a back-pumping system 16 for pumping residual incompletely oxidized phthalic anhydride tail gas in the switching process of the regenerator 8 back to the tail gas feeding pipe 10, and then the residual incompletely oxidized phthalic anhydride tail gas enters the regenerator 8 and the oxidation chamber 7 through the gas distribution unit 9 for further oxidation treatment.
Regenerative oxidation system 1 also can be replaced by catalytic oxidation system to be used for the oxidation of phthalic anhydride tail gas, the catalytic oxidation system who uses among the prior art can be chooseed for use to the technical staff in the field is used for the utility model discloses.
As shown in fig. 1, the desulfurization system 2 of the present embodiment includes a desulfurization tower 17, a circulation pump 18 and a demisting tower 19, a lime slurry is disposed in the desulfurization tower 17, and the first pipeline 13 and the second pipeline 14 are both connected to the top of the desulfurization tower 17, SO that the oxidized phthalic anhydride tail gas enters the desulfurization tower 17 from the top thereof, and the lime slurry is used to remove harmful gas SO2. The circulating pump 18 is connected to the desulfurizing tower 17 and is used for conveying the lime slurry in the bottom of the desulfurizing tower 17 to the top of the desulfurizing tower 17 SO that the tail gas entering the desulfurizing tower 17 is fully contacted with the lime slurry for desulfurization, thereby improving SO removal2The efficiency of (c); wherein, in the desulfurization process, lime slurry at the bottom of the desulfurization tower 17 forms desulfurization solution, and the pH value of the desulfurization solution can be controlled to be about 5; the number of the circulating pumps 18 is not limited as long as the circulating of the lime slurry (or called desulfurization solution) can be effectively realized, and the lime slurry is sufficiently mixed with SO2The phthalic anhydride tail gas is fully contacted, and a person skilled in the art can flexibly select the phthalic anhydride tail gas according to actual needs, the embodiment is not particularly limited, and referring to fig. 1, two circulating pumps 18 are selected for use in the embodiment. The demister tower 19 is connected to the lower middle portion of the desulfurization tower 17 through a third pipe 20 to remove SO2The phthalic anhydride tail gas enters a demisting tower 19 for demisting treatment, and a demister 43 removes SO2And collecting liquid drops carried in the phthalic anhydride tail gas.
Further, in order to ensure the desulfurization effect, the desulfurization system 2 may further include a lime slurry preparation device 21 to periodically replenish fresh lime slurry into the desulfurization tower 17; with continued reference to fig. 1, the lime slurry preparing device 21 is connected to the lower portion of the desulfurization tower 17 by a suction pump 22 to transfer the lime slurry in the lime slurry preparing device 21 into the desulfurization tower 17; a plurality of stirring paddles 23 positioned in the desulfurization solution are provided in the desulfurization tower 17 to uniformly mix the desulfurization solution.
In order to save space and make the whole system compact, the demister 43 is provided on the lime slurry preparing apparatus 21, and both are integrated.
In some embodiments, with reference to fig. 1, the filter pressing system 3 of the present embodiment includes a membrane plate-and-frame filter press 24, a hydraulic system 25, a pressing system 26, and a filter pressing feed pump 28, wherein the membrane plate-and-frame filter press 24 is connected to the bottom of the desulfurization tower 17 through a fourth pipeline 27, and the fourth pipeline 27 is provided with the filter pressing feed pump 28 for conveying the gypsum-containing desulfurization solution in the desulfurization tower 17 to the membrane plate-and-frame filter press 24; the hydraulic system 25 is connected with the membrane plate-and-frame filter press 24 and is used for controlling the plate-and-frame movement of the membrane plate-and-frame filter press 24; the pressing system 26 is connected with the membrane plate-and-frame filter press 24, and provides pressure for the membrane plate-and-frame filter press 24, for example, the pressure filtration pressure is controlled to be 1.3MPa-1.8MPa, and the water is removed from the gypsum. The solid gypsum separated after squeezing can be sent to a cement plant to be used as a coagulation regulator; and the desulfurization mother liquor after gypsum removal enters a desulfurization mother liquor treatment system 4 for further treatment.
In some embodiments, with continued reference to fig. 1, the desulfurization mother liquor treatment system 4 includes a mother liquor pond 29, a spray drying tower 30, and a dust remover 31, the mother liquor pond 29 being connected to the filter press system 3 for containing the desulfurization mother liquor generated after filter pressing by the filter press system 3; an atomizing pump is arranged between the spray drying tower 30 and the mother liquor pool 29, the desulfurization mother liquor in the mother liquor pool 29 is atomized by the atomizing pump and then enters the spray drying tower 30 from the lower part of the spray drying tower 30, and the spray drying tower 30 is connected with an air pipeline 32 for introducing atomized air into the lower part of the spray drying tower 30; the dust collector 31 is connected to the top of the spray drying tower 30, and is used for removing dust from the exhaust gas containing particulate matters discharged from the top of the spray drying tower 30.
The drying gas used by the spray drying tower 30 is not limited, in order to save energy, the phthalic anhydride tail gas is used as the drying gas in the embodiment, specifically, as shown in fig. 1, the desulfurization mother liquor treatment system 4 further includes a tail gas mixing chamber 33, an inlet of the tail gas mixing chamber 33 is connected with the oxidation chamber 7 through a fifth pipeline 34 and is connected with the first pipeline 13 through a sixth pipeline 35, and an outlet of the tail gas mixing chamber 33 is connected with the bottom of the spray drying tower 30 through a seventh pipeline 36, so that the mixed tail gas enters the spray drying tower 30 to dry the atomized desulfurization mother liquor therein. In the embodiment, tail gas at about 7850 ℃ in an oxidation chamber of the thermal storage oxidation system 1 and tail gas at about 160-180 ℃ in a first pipeline 13 are mixed to form tail gas at about 250 ℃, the tail gas enters a spray drying tower 30 to be used as drying gas to dry atomized desulfurization mother liquor to remove dissolved salts and COD in the desulfurization mother liquor, the temperature of a top outlet of the spray drying tower 30 is controlled to be not lower than 125 ℃, and the tail gas containing particulate matters enters a dust remover 31 from the top outlet of the spray drying tower 30 to be filtered and dedusted. The type of the dust remover 31 can be selected according to actual needs, and is not specifically limited herein, and the bag-type dust remover 31 is shown in this embodiment.
In order to further purify and reduce environmental pollution, the desulfurization mother liquor treatment system 4 further comprises an induced draft fan 37, the induced draft fan 37 is connected with the dust remover 31, and meanwhile, an air outlet of the induced draft fan 37 is connected with the first pipeline 13, so that the part of tail gas filtered by the dust remover 31 is sent into the first pipeline 13 under the action of the induced draft fan 37 and enters the desulfurization tower 17 for further purification.
The desulfurization mother liquor treatment system 4 takes the tail gas obtained by mixing part of the high-temperature tail gas and the low-temperature tail gas subjected to heat storage or catalytic oxidation as a heat source, fully utilizes the waste heat released by heat storage or catalytic oxidation of the tail gas, does not need to increase energy consumption, and is energy-saving and environment-friendly; after the desulfurization mother liquor is treated by the spray dryer, the dust particles in the mixed tail gas containing water vapor and the dust particles are removed by the dust remover 31 and then enter the desulfurization tower 17 of the tail gas desulfurization system 2 for further washing and purification treatment, so that the desulfurization effect is effectively ensured to be met under the condition of zero emission of the desulfurization mother liquor.
In some embodiments, as shown in fig. 1, the wet electrostatic precipitator system 5 comprises an electrostatic precipitator 38 and a wet electric washing system 39, a lower inlet of the electrostatic precipitator 38 is connected with the top of the demisting tower 19 of the desulfurization system 2, and a cathode wire and an anode tube are arranged in the electrostatic precipitator 38; after the phthalic anhydride tail gas is desulfurized by the desulfurizing tower 17, the temperature is reduced to about 50 ℃, the phthalic anhydride tail gas is collected by the demisting tower 19 and enters the electrostatic dust collector 38 of the wet electrostatic dust collection system 5, and dust collection is carried out under the action of electrifying the cathode wire and the anode tube (the cathode wire and the anode tube adsorb dust in the tail gas when being electrified); a wet electric washing system 39 is provided above the electrostatic precipitator 38 for spraying water into the electrostatic precipitator 38 to wash away dust attached to the cathode lines and the anode tubes. The wet electric flush system 39 may be flushed in a manner that periodically flushes trapped dust.
In order to collect the washing water for recycling and saving energy, the wet electrostatic precipitator system 5 further comprises a water storage tank, as shown in fig. 1, the water storage tank is connected to a lower outlet of the electrostatic precipitator 38, the washing water generated by the wet electric washing system 39 washing the dust attached to the cathode wire and the anode tube enters a condensed water storage system 40 for collection and storage, and the washing water collected by the water storage tank can be used as the washing water of the demister 43 after being condensed by the condenser 42. Specifically, the water storage tank is communicated with the tower body 41 through an eighth pipeline 46 to convey the condensed water in the water storage tank into the tower body 41 for washing the demister 43.
In some embodiments, with reference to fig. 1, the white feather elimination system 6 includes a tower body 41, a condenser 42, a demister 43 and a heater 44 are sequentially disposed in the tower body 41 from bottom to top, a lower end of the tower body 41 is connected to an upper end outlet of the electrostatic precipitator 38, and an upper end of the tower body 41 is connected to a chimney 45. The tail gas after wet electrostatic dust collection enters a tower body 41 of a white feather elimination system 6, is condensed to below 30 ℃ under the action of a condenser 42, condensed water in the tail gas is collected and is removed to a gypsum slurry preparation device to prepare lime slurry or the lime slurry enters a condensed water storage system 40, when the temperature of the tail gas is reduced from 50 ℃ to 30 ℃, the saturated water content of wet tail gas is reduced from 111.8g/Nm3Reduced to 35.2g/Nm3At this time, the water content of the tail gas is reduced by 68.5%. The dehumidified tail gas rises 32 to enter a demister 43 for demisting, then is heated to more than 80 ℃ by a heater 44, and is discharged cleanly through a chimney 45, and the discharged tail gas cannot see any colored smoke plume at the temperature of more than minus 8 ℃, so that ultralow emission of phthalic anhydride tail gas pollutants is realized, clean production of phthalic anhydride is realized, and the natural environment is effectively protected.
Further, the white feather elimination system 6 may further include a sonic soot blower disposed below the heater 44 for blowing off dust on the heater 44 to prevent the heater 44 from being dusted.
As shown in fig. 2, the embodiment of the present invention provides a method for purifying phthalic anhydride tail gas, which comprises the following steps:
1) oxidizing the phthalic anhydride tail gas in a thermal storage oxidation system 1 or a catalytic oxidation system to perform thermal storage oxidation or catalytic oxidation on organic matters in the phthalic anhydride tail gas;
2) the oxidized phthalic anhydride tail gas enters a desulfurization system 2, and the harmful gas SO is removed by lime slurry2And forming a gypsum solution;
3) the gypsum solution enters a filter pressing system 3, and solid gypsum and desulfurization mother liquor are separated by filter pressing and squeezing;
4) the desulfurization mother liquor enters a desulfurization mother liquor treatment system 4, so that dissolved salt and COD in the desulfurization mother liquor are solidified and carbonized into dust particles, the dust particles are removed by a dust remover 31, and the tail gas from which the dust particles are removed enters the desulfurization system 2 for further purification treatment;
5) removing harmful gas SO in a desulfurization system 22The tail gas enters a wet electrostatic dust collection system 5 for electrostatic dust collection to remove dust;
6) the tail gas without dust enters a white smoke elimination system 6, white smoke is eliminated through temperature reduction and temperature rise, and no white smoke is discharged at the temperature of-8 ℃.
The utility model discloses with the ingenious combination of a plurality of systems, solved the phthalic anhydride tail gas and contained higher SO2Particulate matter and small amounts of SO3The air pollution is serious by the harmful substances, and the particulate matters and SO in the harmful substances3PM2.5 is easily generated, haze and environmental pollution are caused, and a lime gypsum method is adopted to remove SO2Meanwhile, the wet electrostatic dust collection system 5 is used to effectively control the emission of fine particles and sulfuric acid mist, SO3The removal efficiency reaches more than 80 percent, and PM2.5 and SO can be effectively removed3The white feather elimination system 6 is utilized to remove SO2And the like, and the generated colored smoke plume is polluted.
Figure 3 shows the saturation moisture content of wet flue gas at atmospheric pressure versus the saturation temperature of the flue gas. Book (I)The utility model discloses phthalic anhydride tail gas clean-up processing system and phthalic anhydride tail gas processing method of embodiment has systematically solved the tail gas pollution problem in the phthalic anhydride production process, and whole process technology flow is whole to realize automated control, has formed one set of complete phthalic anhydride tail gas clean-up processing technology and phthalic anhydride tail gas processing apparatus. The exhaust gas treated by the phthalic anhydride exhaust gas purification treatment system and the phthalic anhydride exhaust gas treatment method has the pollutant emission concentration far lower than that of the exhaust gas treated by the existing national most strict index GB31571-2015 Table 5 of the petrochemical industry pollutant emission Standard, and the special emission limit value of the atmospheric pollutants is 20mg/m350mg/m of sulfur dioxide3Nitrogen oxide 100mg/m3. The emission index of VOCs is far lower than the emission control standard of volatile organic compounds of industrial enterprises (DB132322-2016) and the maximum allowable emission concentration of non-methane total hydrocarbons is 80mg/m in the table 13The standard of (2). After the process technology is implemented, the average number of the emission concentration detection of various pollutants in the emitted tail gas is as follows: particle 2.82mg/m317.27mg/m of sulfur dioxide3Nitrogen oxide 41.47mg/m3，VOCs7.180mg/m3。
The above description is intended to be illustrative and not restrictive. For example, the above-described examples (or one or more versions thereof) may be used in combination with each other, and it is contemplated that the embodiments may be combined with each other in various combinations or permutations. The scope of the invention should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.
Claims (10)
1. Phthalic anhydride tail gas clean-up processing system, its characterized in that includes:
the thermal storage oxidation system or the catalytic oxidation system is used for oxidizing organic matters in the phthalic anhydride tail gas;
the desulfurization system is connected with the heat storage oxidation system or the catalytic oxidation system and is used for removing SO from the tail gas oxidized by the heat storage oxidation system or the catalytic oxidation system2Processing;
the filter pressing system is connected with the desulfurization system and is used for carrying out filter pressing treatment on the desulfurization solution containing gypsum in the desulfurization system;
the desulfurization mother liquor treatment system is connected with the filter pressing system and is used for treating desulfurization mother liquor generated after filter pressing;
a wet electrostatic dust removal system connected with the desulfurization system and used for removing SO in the desulfurization system2Carrying out electrostatic dust removal treatment on the tail gas;
and the white feather elimination system is connected with the wet electrostatic dust removal system and is used for eliminating white feather of the tail gas subjected to electrostatic dust removal.
2. The phthalic anhydride tail gas purification treatment system according to claim 1, wherein the thermal storage oxidation system comprises:
the reaction chamber is internally provided with a gas distribution unit, a heat storage chamber and an oxidation chamber which are communicated in sequence from bottom to top, a gas inlet of the gas distribution unit is connected with a tail gas feeding pipe, a gas outlet of the gas distribution unit is connected with the desulfurization system through a first pipeline, and the oxidation chamber is connected with the desulfurization system through a second pipeline;
the tail gas heater is arranged on the tail gas feeding pipe and used for heating tail gas;
and the waste heat boiler is arranged on the second pipeline and is used for recovering the redundant heat contained in the oxidation process in the oxidation chamber.
3. The phthalic anhydride tail gas purification treatment system according to claim 2, wherein the desulfurization system comprises:
the first pipeline and the second pipeline are connected to the top of the desulfurization tower;
the circulating pump is connected to the desulfurizing tower and used for conveying the lime slurry in the bottom of the desulfurizing tower to the top of the desulfurizing tower SO that the tail gas entering the desulfurizing tower is fully contacted with the lime slurry to remove SO2；
A demisting tower connected with the middle lower part of the desulfurizing tower through a third pipeline to remove SO2The tail gas enters the demisting towerAnd carrying out demisting treatment.
4. The phthalic anhydride tail gas purification treatment system according to claim 3, wherein the desulfurization system further comprises a lime slurry preparation device connected to a lower portion of the desulfurization tower through a suction pump to deliver the lime slurry therein into the desulfurization tower; and a plurality of stirring paddles positioned in the lime slurry are arranged in the desulfurizing tower.
5. The phthalic anhydride tail gas purification treatment system according to claim 3, wherein the pressure filtration system comprises:
the membrane plate-and-frame filter press is connected with the bottom of the desulfurization tower through a fourth pipeline, a filter pressing feeding pump is arranged on the fourth pipeline, and the filter pressing feeding pump is used for conveying the desulfurization liquid containing gypsum in the desulfurization tower to the membrane plate-and-frame filter press;
the hydraulic system is connected with the membrane plate-and-frame filter press and is used for driving the plate-and-frame of the membrane plate-and-frame filter press to move;
and the squeezing system is connected with the membrane plate and frame filter press and is used for providing squeezing pressure for the membrane plate and frame filter press.
6. The phthalic anhydride tail gas purification treatment system according to claim 3, wherein the desulfurization mother liquor treatment system comprises:
the mother liquor pool is connected with the filter pressing system and is used for containing desulfurization mother liquor generated after filter pressing of the filter pressing system;
the spray drying tower is connected with an air pipeline used for introducing atomizing air into the lower part of the spray drying tower;
and the dust remover is connected to the top of the spray drying tower and is used for removing dust from the tail gas containing the particulate matters discharged from the top of the spray drying tower.
7. The phthalic anhydride tail gas purification treatment system according to claim 6, wherein the desulfurization mother liquor treatment system further comprises:
the induced draft fan is connected with the dust remover so as to send the gas in the dust remover into the first pipeline and enter the desulfurizing tower; and/or
And the inlet of the tail gas mixing chamber is connected with the oxidation chamber through a fifth pipeline and is connected with the first pipeline through a sixth pipeline, and the outlet of the tail gas mixing chamber is connected with the bottom of the spray drying tower through a seventh pipeline so that the mixed tail gas enters the spray drying tower to dry the atomized desulfurization mother liquor in the spray drying tower.
8. The phthalic anhydride tail gas purification treatment system according to claim 3, wherein the wet electrostatic dust removal system comprises:
the lower end inlet of the electrostatic dust collector is connected with the top of a demisting tower of the desulfurization system so that demisted tail gas enters the electrostatic dust collector, a cathode wire and an anode tube are arranged in the electrostatic dust collector, and the cathode wire and the anode tube adsorb dust in the tail gas when the electrostatic dust collector is electrified;
and the wet electric washing system is arranged above the electrostatic dust collector and used for spraying water into the electrostatic dust collector so as to wash away the dust attached to the cathode wire and the anode tube.
9. The phthalic anhydride tail gas purification treatment system according to claim 8, wherein the white feather elimination system comprises a tower body, a condenser, a demister and a heater are sequentially arranged in the tower body from bottom to top, the lower end of the tower body is connected with an upper end outlet of the electrostatic dust collector, so that the tail gas subjected to electrostatic dust collection enters the tower body, and the upper end of the tower body is connected with a chimney.
10. The phthalic anhydride tail gas purification treatment system of claim 9, wherein the wet electrostatic precipitator system further comprises a water storage tank, and the water storage tank is connected with a water outlet at the lower end of the electrostatic precipitator to contain condensed water; the water storage tank pass through the eighth pipeline with the tower body intercommunication, in order with the comdenstion water in the water storage tank is carried to in the tower body, be used for washing the defroster.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110237641A (en) * | 2019-07-17 | 2019-09-17 | 邢台旭阳化工有限公司 | Benzoic anhydride tail-gas cleaning treatment system and benzoic anhydride tail-gas purifying treatment method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110237641A (en) * | 2019-07-17 | 2019-09-17 | 邢台旭阳化工有限公司 | Benzoic anhydride tail-gas cleaning treatment system and benzoic anhydride tail-gas purifying treatment method |
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