CN111450656A - Acrolein production waste gas treatment device - Google Patents
Acrolein production waste gas treatment device Download PDFInfo
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- CN111450656A CN111450656A CN202010474265.0A CN202010474265A CN111450656A CN 111450656 A CN111450656 A CN 111450656A CN 202010474265 A CN202010474265 A CN 202010474265A CN 111450656 A CN111450656 A CN 111450656A
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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
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
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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
- B01D53/26—Drying gases or vapours
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/78—Separation; Purification; Stabilisation; Use of additives
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/78—Separation; Purification; Stabilisation; Use of additives
- C07C45/79—Separation; Purification; Stabilisation; Use of additives by solid-liquid treatment; by chemisorption
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/78—Separation; Purification; Stabilisation; Use of additives
- C07C45/81—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/46—Recuperation of heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
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Abstract
The invention relates to a treatment device of acrolein production waste gas, which comprises a compressor for improving the pressure of the waste gas, wherein the compressor comprises an air inlet main pipe and an exhaust main pipe, and the exhaust main pipe is communicated with a buffer tank; the outlet end of the buffer tank is communicated with a condensing tower which is used for reducing the temperature of the high-pressure waste gas and condensing gas-phase acrolein in the high-pressure waste gas into liquid, and the outlet end of the condensing tower is communicated with a gas-liquid separator; the gas-liquid separator is used for separating liquid-phase acrolein and gas-phase other waste gas, the liquid-phase acrolein is absorbed and then returns to the production process of the acrolein, and the gas-phase other waste gas is led to the gas mixer; the gas mixer comprises an air inlet pipe communicated with the exhaust end of the air compressor and a mixed gas exhaust pipe communicated to the incineration boiler for incineration. The treatment device for the acrolein production waste gas recovers gaseous acrolein in the waste gas, improves the yield and reduces pollution.
Description
Technical Field
The invention relates to the technical field of acrolein chemical production, in particular to an acrolein production waste gas treatment device.
Background
Acrolein, the simplest unsaturated aldehyde, is of the formula C3H4O, which is a colorless, transparent, malodorous liquid in general, has a strong irritant and tear-inducing vapor. Is an important synthetic intermediate in chemical industry and is widely applied to resin production and organic synthesis. Currently, a process for the preparation of acrolein comprises:
①, propylene catalytic air oxidation, namely, propylene is directly oxidized with air in the presence of bismuth molybdate and bismuth phosphomolybdate catalysts at the reaction temperature of 310-470 ℃ and under normal pressure, and the finished product is obtained by removing the by-product acid from the generated reaction product and then distilling.
②, an industrial preparation method, mixing propylene, air, water vapor and a catalyst in proportion, reacting in a fixed bed reactor under the conditions of 0.1-0.2MPa and 350-450 ℃, wherein the contact time is 0.8s, the heat released by the reaction is recycled for producing steam, the gas mixture generated by the reaction is quenched by water, the tail gas from a quenching tower is washed before emptying, the organic liquid from the bottom of the quenching tower enters a stripping tower to strip out acrolein and other light components, and then water and acetaldehyde are removed from crude acrolein by a distillation method.
③, glycerin dehydration, which is a laboratory preparation method, heating glycerin, potassium bisulfate or potassium sulfate, boric acid and aluminum trichloride at the temperature of 215-235 ℃, evaporating acrolein gas generated by the reaction, condensing and collecting to obtain a crude product, adding 10% sodium hydrogen phosphate solution into the crude product to adjust the pH value to 6, fractionating, and collecting fractions at the temperature of 50-75 ℃ to obtain the refined acrolein product.
④, formaldehyde acetaldehyde method, which is to condense formaldehyde and acetaldehyde in gas phase under the catalysis of silica gel impregnated with sodium silicate.
Due to the acrolein in the category 3 carcinogen list and its special physical properties, the exhaust gas generated in the acrolein preparation process contains a large amount of gaseous acrolein and is treated by incineration, however, the conventional incineration treatment method still has the following disadvantages:
1. gaseous acrolein is only burnt, so that the waste of the acrolein is caused;
2. the gaseous acrolein is not completely burnt and is discharged into the atmosphere to cause environmental pollution.
Disclosure of Invention
In order to solve the technical problems in the background technology, the invention provides a treatment device for acrolein production waste gas, which is used for recovering gaseous acrolein in the waste gas, improving the yield and reducing pollution.
The technical scheme adopted by the invention is as follows:
an acrolein production exhaust gas treatment device, comprising: the compressor for improving exhaust gas pressure, the compressor includes inlet manifold, exhaust manifold, the exhaust manifold intercommunication is provided with the buffer tank, the exit end intercommunication of buffer tank is provided with the condensing tower, the condensing tower is used for reducing high-pressure exhaust gas's temperature to make the condensation of gaseous phase acrolein in the high-pressure exhaust gas be liquid, the exit end intercommunication of condensing tower is provided with vapour and liquid separator, vapour and liquid separator is used for separating liquid phase acrolein, other waste gas of gaseous phase, return to in the production technology of acrolein after liquid phase acrolein is adsorbed, other waste gas of gaseous phase lead to gas mixer, gas mixer includes the air inlet pipe that communicates with the exhaust end of air compressor machine mutually to and the mixed gas calandria, the mixed gas calandria communicates to incineration boiler, burns.
Furthermore, the acrolein production flow comprises a vacuum pump system, the compressor is a diaphragm compressor in a multi-stage compression mode, and an air inlet manifold of the compressor is communicated to an air outlet end of the vacuum pump system and used for collecting waste gas in an acrolein production process.
Further, the condensing tower includes the tower body of vertical setting, the upper and lower both ends of tower body are provided with the refrigerant mouth respectively, be provided with the blind plate in the tower body of refrigerant mouth end, the blind plate is provided with two sets ofly and separates the tower body for sealed three-layer space, and the tower body middle level between two sets of blind plates is provided with the multiunit tubulation side by side, the tubulation is with tower body upper strata, lower floor intercommunication, and tower body middle level between the blind plate is crisscross to be provided with the multilayer and flows the board, be provided with the breach that is used for circulating high-pressure waste gas on the board of footpath, the breach on each layer of footpath board is crisscross to be set up, and the intercommunication is provided with the high-pressure waste.
Further, the runoff board sets up to the low slope face in breach department.
Further, the gas-liquid separator comprises a horizontally arranged tank body, a gas-liquid inlet communicated with the outlet end of the condensing tower and a gas-phase outlet communicated with the inlet end of the gas mixer are symmetrically arranged on the upper portions of the two ends of the tank body, a filler bin is arranged in the tank body at the gas-liquid inlet, a filler opening communicated with the filler bin and a manhole are further arranged on the tank body, a mist catcher is arranged in the tank body at the gas-phase outlet, a liquid-phase outlet and a drain outlet are symmetrically arranged on the lower portions of the two ends of the tank body, and the liquid-phase outlet is communicated with washing and dewatering process equipment in the acrolein production process.
Furthermore, two groups of pressure sensors are arranged in the buffer tank and are respectively arranged at the upper end and the lower end in the buffer tank for detecting the gas phase pressure and the liquid phase liquid level in the buffer tank,
the middle part of the side wall of the buffer tank is communicated with a feed pipeline communicated with an exhaust main pipe of the compressor, and the feed pipeline is provided with a first opening-closing electric control valve linked with a pressure sensor at the lower end in the buffer tank;
the upper part of the side wall of the buffer tank is communicated with an outlet pipeline communicated with the condensing tower, and a second opening and closing electric control valve linked with a pressure sensor at the upper end in the buffer tank is arranged on the outlet pipeline;
the center of the bottom of the buffer tank is communicated with a liquid discharge pipeline communicated with the condensing tower and a gas-liquid separator connecting pipeline, and the liquid discharge pipeline is provided with a third opening and closing electric control valve linked with a pressure sensor at the lower end in the buffer tank.
Furthermore, a three-way pipe fitting is arranged at the joint of the liquid discharge pipeline and the condensing tower as well as the gas-liquid separator, and a pressure sensor is arranged at the upper part in the gas-liquid separator;
a fourth opening and closing electric control valve linked with a pressure sensor at the lower end in the buffer tank is arranged on a pipeline of the three-way pipe fitting communicated with the condensing tower;
a fifth opening and closing electric control valve linked with a pressure sensor in the gas-liquid separator is arranged on a pipeline of the three-way pipe fitting communicated with the gas-liquid separator;
and a flow meter and an adjusting electric control valve are sequentially arranged on a connecting pipeline from a gas phase outlet of the gas-liquid separator to the gas mixer, and the adjusting electric control valve is electrically linked with the flow meter.
Further, the condensing tower sets up to multistage cooling tower to from top to bottom sets gradually, including first level cooling tower, the … … N level cooling tower of second level cooling tower:
the primary cooling tower comprises a high-pressure waste gas main inlet communicated with the outlet end of the buffer tank, the outlet end of the primary cooling tower is communicated to the inlet end of the secondary cooling tower and sequentially communicated to the N-stage cooling tower in this way, and the outlet end of the N-stage cooling tower is provided with a high-pressure waste gas main outlet communicated with the gas-liquid separator;
the multistage cooling tower further comprises: the cooling medium main inlet pipe is used for collecting the cooling medium ports at the upper end of the multi-stage cooling tower, and the cooling medium main outlet pipe is used for collecting the cooling medium ports at the lower end of the multi-stage cooling tower.
A method for treating exhaust gas from acrolein production, comprising:
collecting, namely uniformly collecting the waste gas by a vacuum pump system in the acrolein production process, and storing the waste gas into a storage tank;
compressing, namely increasing the pressure of the waste gas collected in the storage tank by a multi-stage compression mode of a compressor, and filling the waste gas into a buffer tank;
condensing, wherein high-pressure waste gas in the buffer tank enters a condensing tower from a high-pressure waste gas port, the high-pressure waste gas is contacted with a tube nest in which a refrigerant is introduced to reduce the temperature, so that gas-phase acrolein in the high-pressure waste gas is condensed into liquid, and liquid-phase acrolein crude liquid and gas-phase waste gas in other states are discharged from a high-pressure waste gas outlet through the drainage of a radial flow plate;
adsorbing, the crude liquid of acrolein in liquid phase and other waste gas in gas phase state enter the tank body of the gas-liquid separator through the gas-liquid inlet, and the high-pressure gas-liquid mixture enables gas and liquid to be separated through the filler bin: other waste gas enters the tank body from the side wall of the filler bin and is discharged from the gas phase outlet through the mist catcher; the crude acrolein liquid flows out from the lower part of the filler bin under the action of gravity, flows to the lower part in the tank body and is discharged from the liquid phase outlet until the dehydration process for producing the acrolein;
burning other waste gas into the gas mixer via the gas phase outlet and mixing with air, spraying the mixed gas into the burning boiler via the mixed gas exhaust pipe of the gas mixer, and returning the heat produced by burning back to the oxidation process of acrolein production via hot steam.
Further, the processing method further includes a compression process:
through the multi-stage compression of the compressor, the physical state of the waste gas is changed, so that liquid-phase acrolein can be generated in the high-pressure waste gas filled into the buffer tank, meanwhile, the two groups of pressure sensors arranged in the buffer tank can judge the liquid level in the buffer tank in a pressure difference mode, when the liquid level reaches the liquid drainage standard, the first opening-closing electric control valve, the third opening-closing electric control valve and the fifth opening-closing electric control valve are controlled to be opened in an electric linkage mode, and the second opening-closing electric control valve and the fourth opening-closing electric control valve are controlled to be closed, so that the liquid-phase acrolein in the buffer tank directly enters a gas-liquid separator (40), and then the steps of adsorption and incineration are sequentially carried out;
on the contrary, when the liquid level does not reach the liquid drainage standard, the first opening-closing electric control valve, the third opening-closing electric control valve and the fifth opening-closing electric control valve are controlled to be closed in an electric linkage mode, the second opening-closing electric control valve and the fourth opening-closing electric control valve are controlled to be opened, high-pressure waste gas enters the step of condensation, and then the steps of adsorption and incineration are sequentially carried out.
The acrolein production waste gas treatment device has the advantages that:
1. condensing gaseous acrolein into liquid in a compression and cooling mode, and recovering the liquid;
2. the content of gaseous acrolein in the waste gas is reduced, and the environmental protection effect is improved;
3. the recovered waste gas is optimized in combustion proportion by a gas mixer, and the combustion heat is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention, reference will now be made in brief to the accompanying drawings, which are needed in the description, and in which embodiments of the present invention are illustrated.
FIG. 1 is a schematic perspective view of an apparatus for treating exhaust gas from acrolein production according to an embodiment of the present invention;
FIG. 2 is a schematic perspective view of an elevating mechanism of an apparatus for treating exhaust gas from acrolein production according to an embodiment of the present invention;
FIG. 3 is an exploded view of an anchor drilling mechanism of an apparatus for treating exhaust gas from acrolein production according to an embodiment of the present invention;
FIG. 4 is a schematic perspective view of a guide mechanism of an apparatus for treating exhaust gas from acrolein production according to an embodiment of the present invention.
In the figure:
10. a compressor, 11, an air inlet main pipe, 12, an air outlet main pipe,
20. a buffer tank is arranged on the top of the container,
30. a condensing tower 31, a tower body 32, a refrigerant port 33, a blind plate 34, a tube array 35, a runoff plate 36, a gap 37, a high-pressure waste gas inlet 38, a high-pressure waste gas outlet,
30-A, a first-stage cooling tower, 30-B, a second-stage cooling tower, 30-N, N stages of cooling towers,
301. a high-pressure waste gas main inlet 302, a high-pressure waste gas main outlet 303, a refrigerant main inlet pipe 304, a refrigerant main outlet pipe,
40. a gas-liquid separator 41, a tank body 42, a gas-liquid inlet 43, a gas-phase outlet 44 and a liquid-phase outlet,
45. a filling opening 46, a filling bin 47 and a mist catcher,
50. a gas mixer 51, an air inlet pipe 52, a mixed gas exhaust pipe,
60. a tee pipe fitting.
Detailed Description
In order to clearly and clearly illustrate the specific implementation objects and the implementation modes of the invention, the technical scheme of the invention is completely described below, and the described examples are a part of the examples of the invention, but not all the examples. All other embodiments based on the described embodiments of the invention are within the scope of the invention without making creative efforts.
As shown in fig. 1, the treatment device for acrolein production exhaust gas according to the present invention comprises: the compressor 10 for improving the pressure of the exhaust gas comprises a vacuum pump system, the compressor 10 is a diaphragm compressor in a multistage compression mode, the compressor 10 comprises an air inlet manifold 11 and an air outlet manifold 12, and the air inlet manifold 11 of the compressor 10 is communicated to the air outlet end of the vacuum pump system and used for collecting the exhaust gas in the production process of the acrolein.
As shown in fig. 1, the exhaust main pipe 12 is provided with a buffer tank 20 in a communicating manner, and two sets of pressure sensors are provided in the buffer tank 20 and are respectively disposed at the upper and lower ends of the buffer tank 20 for detecting the gas phase pressure and the liquid phase level in the buffer tank 20. The middle part of the side wall of the buffer tank 20 is communicated with a feed pipeline communicated with the exhaust main pipe 12 of the compressor 10, and the feed pipeline is provided with a first opening and closing electric control valve linked with a pressure sensor at the lower end in the buffer tank 20; an outlet pipeline communicated with the condensing tower 30 is communicated with the upper part of the side wall of the buffer tank 20, and a second opening and closing electric control valve linked with a pressure sensor at the upper end in the buffer tank 20 is arranged on the outlet pipeline; the center of the bottom of the buffer tank 20 is communicated with a liquid discharge pipeline communicated with the connecting pipeline of the condensing tower 30 and the gas-liquid separator 40, and the liquid discharge pipeline is provided with a third opening and closing electric control valve linked with a pressure sensor at the lower end in the buffer tank 20.
As shown in fig. 1, the outlet end of the buffer tank 20 is connected to a condensing tower 30, and the condensing tower 30 is used for reducing the temperature of the high-pressure exhaust gas and condensing the gas-phase acrolein in the high-pressure exhaust gas into a liquid state. As shown in fig. 2, the condensing tower 30 includes a tower body 31 vertically arranged, the upper and lower ends of the tower body 31 are respectively provided with a refrigerant port 32, the tower body 31 at the end of the refrigerant port 32 is internally provided with a blind plate 33, the blind plate 33 is provided with two groups and divides the tower body 31 into three sealed layers of spaces, the middle layer of the tower body 31 between the two groups of blind plates 33 is provided with a plurality of groups of tubes 34 in parallel, the upper layer and the lower layer of the tower body 31 are communicated by the tubes 34, a plurality of layers of radial flow plates 35 are staggered in the middle layer of the tower body 31 between the blind plates 33, the radial flow plates 35 are provided with notches 36 for circulating high-pressure waste gas, the notches 36 on the radial flow plates 35 of all layers are arranged in a staggered mode, the radial flow plates 35 are arranged to be inclined plate surfaces with low notches, the side wall of the middle layer of the tower body 31 is provided with a high-pressure waste gas inlet 37 located on the upper portion of the tower body 31 in a communicated mode, and a high-pressure waste gas outlet 38 located on the lower portion of the tower body 31.
As shown in fig. 4, in order to improve the condensation effect of acrolein, the condensation tower 30 is provided as a multistage cooling tower in the condensation process, and comprises a first-stage cooling tower 30-a and a second-stage cooling tower 30-B … … N-stage cooling towers 30-N from top to bottom: the primary cooling tower 30-A comprises a high-pressure waste gas main inlet 301 communicated with the outlet end of the buffer tank 20, the outlet end of the primary cooling tower 30-A is communicated to the inlet end of the secondary cooling tower 30-B and is sequentially communicated to the N-stage cooling tower 30-N according to the mode, and the outlet end of the N-stage cooling tower 30-N is provided with a high-pressure waste gas main outlet 302 communicated with the gas-liquid separator 40; the multistage cooling tower further comprises: a refrigerant inlet manifold 303 for collecting the refrigerant ports 32 at the upper end of the multi-stage cooling tower, and a refrigerant outlet manifold 304 for collecting the refrigerant ports 32 at the lower end of the multi-stage cooling tower.
As shown in fig. 1, the outlet end of the condensing tower 30 is connected to a gas-liquid separator 40, and the gas-liquid separator 40 is used for separating acrolein in liquid phase and other off-gas in gas phase, and as shown in fig. 3, includes: the horizontal type condensing tower comprises a tank body 41 which is horizontally arranged, wherein a gas-liquid inlet 42 communicated with the outlet end of the condensing tower 30 and a gas-phase outlet 43 communicated with the inlet end of the gas mixer 50 are symmetrically arranged at the upper parts of the two ends of the tank body 41, a filling bin 46 is arranged in the tank body 41 at the gas-liquid inlet 42, a filling port 45 communicated with the filling bin 46 and a manhole are further arranged on the tank body 41, a mist catcher 47 is arranged in the tank body 41 at the gas-phase outlet 43, a liquid-phase outlet 44 and a drain outlet are symmetrically arranged at the lower parts of the two ends of the tank body 41, and the liquid-phase outlet 44 is communicated with washing and dewatering.
As shown in fig. 1, a tee pipe 60 is arranged at the joint of the drainage pipeline and the condensing tower 30 and the gas-liquid separator 40, and a pressure sensor is arranged at the upper part in the gas-liquid separator 40; a fourth opening and closing electric control valve linked with a pressure sensor at the lower end in the buffer tank 20 is arranged on a pipeline of the three-way pipe fitting 60 communicated with the condensing tower 30; a fifth opening and closing electric control valve linked with a pressure sensor in the gas-liquid separator 40 is arranged on a pipeline of the three-way pipe fitting 60 communicated with the gas-liquid separator 40; a flow meter and an adjusting electric control valve are sequentially arranged on a connecting pipeline from the gas phase outlet 43 of the gas-liquid separator 40 to the gas mixer 50, and the adjusting electric control valve is electrically linked with the flow meter. When the gas flow in the connecting pipeline from the gas phase outlet 43 of the gas-liquid separator 40 to the gas mixer 50 is too large, the opening degree is reduced by adjusting the electric control valve, so that the gas flow is reduced; otherwise, the opening degree is increased by adjusting the electric control valve, and the air flow is increased.
The other waste gas in the gas phase is led to a gas mixer 50, the gas mixer 50 comprises an air inlet pipe 51 communicated with the exhaust end of the air compressor and a mixed gas exhaust pipe 52, and the mixed gas exhaust pipe 52 is communicated to the incineration boiler for incineration. The incineration boiler adopts a heat conduction oil boiler and is used for returning heat generated by incineration to the production process of the acrolein. Or the incineration boiler adopts a steam boiler, and a superheater or a heat pump is additionally arranged to increase the temperature of the steam, so that the requirements that the process temperature in the propane oxidation process flow is 450-650 ℃ and the process temperature in the propylene oxidation process flow is 350-450 ℃ in the acrolein preparation process are met.
The first opening and closing electric control valve, the second opening and closing electric control valve, the third opening and closing electric control valve and the fourth opening and closing electric control valve adopt an angular travel pneumatic lining tetrafluoro ball valve; the regulating electric control valve adopts a straight-stroke pneumatic lining tetrafluoro regulating valve. The electromagnetic valve and the positioner adopted by the control adopt an intrinsic safety explosion-proof mode, so that the safety risk of an acrolein production site is reduced.
With reference to the specific structure of the above-described embodiment of the apparatus for treating exhaust gas from acrolein production, a method for treating exhaust gas from acrolein production will be further described.
The processing method comprises the following steps:
collecting, namely uniformly collecting the waste gas by a vacuum pump system in the acrolein production process, and storing the waste gas into a storage tank;
compressing, namely increasing the pressure of the waste gas collected in the storage tank by a multi-stage compression mode of the compressor 10, and filling the waste gas into the buffer tank 20;
condensing, wherein high-pressure waste gas in the buffer tank 20 enters the condensing tower 30 from a high-pressure waste gas port, the high-pressure waste gas is contacted with a tube nest 34 filled with a refrigerant to reduce the temperature, so that gas-phase acrolein in the high-pressure waste gas is condensed into liquid, and liquid-phase acrolein crude liquid and gas-phase waste gas in other states are discharged from the high-pressure waste gas outlet through the drainage of a radial flow plate 35;
adsorbing, the liquid-phase crude acrolein liquid and other gas in a gas-phase state enter the tank 41 of the gas-liquid separator 40 through the gas-liquid inlet 42, and the high-pressure gas-liquid mixture passes through the packing bin 46 to separate gas from liquid: other waste gas enters the tank body 41 from the side wall of the packing bin 46 and is discharged from the gas phase outlet 43 through the mist catcher 47; the crude acrolein liquid flows out from the lower part of the packing bin 46 under the action of gravity to the lower part in the tank body 41 and is discharged from the liquid phase outlet 44 until the dehydration process of acrolein production;
and (3) burning, wherein other waste gas is introduced into the gas mixer 50 through the gas phase outlet 43 and is mixed with air, the mixed gas is sprayed into the burning boiler through a mixed gas discharge pipe 52 of the gas mixer 50 for burning, and the heat generated by burning is returned to the oxidation process for producing the acrolein in a hot steam mode.
According to the physical characteristics of acrolein, gaseous acrolein is naturally liquefied due to the reduction of the molecular distance after compression, and therefore the treatment method further comprises, compression treatment:
through the multi-stage compression of the compressor 10, the physical state of the waste gas is changed, so that liquid-phase acrolein is generated in the high-pressure waste gas filled in the buffer tank 20, meanwhile, the two groups of pressure sensors arranged in the buffer tank 20 can judge the level of the liquid level in the buffer tank 20 in a pressure difference mode, and after the liquid level reaches the liquid drainage standard, the first opening-closing electric control valve, the third opening-closing electric control valve and the fifth opening-closing electric control valve are controlled to be opened in an electric linkage mode, and the second opening-closing electric control valve and the fourth opening-closing electric control valve are controlled to be closed, so that the liquid-phase acrolein in the buffer tank 20 directly enters the gas-liquid separator 40, and then the steps of adsorption and incineration are sequentially carried out;
on the contrary, when the liquid level does not reach the liquid drainage standard, the first opening-closing electric control valve, the third opening-closing electric control valve and the fifth opening-closing electric control valve are controlled to be closed in an electric linkage mode, the second opening-closing electric control valve and the fourth opening-closing electric control valve are controlled to be opened, high-pressure waste gas enters the step of condensation, and then the steps of adsorption and incineration are sequentially carried out.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made in the apparatus for treating exhaust gas from acrolein production and the method for operating the same without departing from the spirit of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. An acrolein production waste gas processing apparatus which characterized in that:
the processing device comprises:
the compressor (10) for improving the pressure of the waste gas comprises a gas inlet main pipe (11) and a gas outlet main pipe (12), wherein the gas outlet main pipe (12) is communicated with a buffer tank (20), the outlet end of the buffer tank (20) is communicated with a condensing tower (30), the condensing tower (30) is used for reducing the temperature of the high-pressure waste gas and condensing gas-phase acrolein in the high-pressure waste gas into liquid, a gas-liquid separator (40) is communicated with the outlet end of the condensing tower (30), the gas-liquid separator (40) is used for separating liquid-phase acrolein and other gas-phase waste gas, the liquid-phase acrolein is adsorbed and then returns to the production process of the acrolein, the other gas-phase waste gas is communicated to a gas mixer (50), and the gas mixer (50) comprises an air inlet pipe (51) communicated with the exhaust end of an air compressor, and the mixed gas calandria (52), the mixed gas calandria (52) communicates to the incineration boiler, burn.
2. The acrolein production exhaust gas treatment device according to claim 1, wherein:
the acrolein production process comprises a vacuum pump system, the compressor (10) is a diaphragm compressor in a multistage compression mode, and an air inlet manifold (11) of the compressor (10) is communicated to an exhaust end of the vacuum pump system and used for collecting exhaust gas in an acrolein production process.
3. The acrolein production exhaust gas treatment device according to claim 2, wherein:
the condensing tower (30) comprises a tower body (31) which is vertically arranged, refrigerant ports (32) are respectively arranged at the upper end and the lower end of the tower body (31), blind plates (33) are arranged in the tower body (31) at the ends of the refrigerant ports (32), two groups of blind plates (33) are arranged and divide the tower body (31) into three sealed layers of spaces, a plurality of groups of tubes (34) are arranged in parallel in the middle layer of the tower body (31) between the two groups of blind plates (33), the upper layer and the lower layer of the tower body (31) are communicated through the tubes (34), a plurality of layers of radial flow plates (35) are arranged in the middle layer of the tower body (31) in a staggered mode between the blind plates (33), notches (36) for circulating high-pressure waste gas in each layer are arranged on the radial flow plates (35) in a staggered mode, a high-pressure waste gas inlet (37) positioned at the upper part of the tower body (31, and a high pressure exhaust gas outlet (38) located at a lower portion of the tower (31).
4. The acrolein production exhaust gas treatment device according to claim 3, wherein:
the radial flow plate (35) is an inclined plate surface with a low notch.
5. The acrolein production exhaust gas treatment device according to claim 3, wherein:
the gas-liquid separator (40) comprises a horizontal tank body (41), wherein a gas-liquid inlet (42) communicated with the outlet end of the condensing tower (30) and a gas-phase outlet (43) communicated with the inlet end of the gas mixer (50) are symmetrically arranged at the upper parts of the two ends of the tank body (41), a filling bin (46) is arranged in the tank body (41) at the gas-liquid inlet (42), a filling opening (45) communicated with the filling bin (46) and a manhole are further arranged on the tank body (41), a mist catcher (47) is arranged in the tank body (41) at the gas-phase outlet (43), a liquid-phase outlet (44) and a sewage drain are symmetrically arranged at the lower parts of the two ends of the tank body (41), and the liquid-phase outlet (44) is communicated with washing and dewatering process equipment in the acrolein production.
6. The acrolein production exhaust gas treatment device according to claim 5, wherein:
two groups of pressure sensors are arranged in the buffer tank (20) and are respectively arranged at the upper end and the lower end in the buffer tank (20) for detecting the gas phase pressure and the liquid phase level in the buffer tank (20),
the middle part of the side wall of the buffer tank (20) is communicated with a feed pipeline communicated with an exhaust main pipe (12) of the compressor (10), and the feed pipeline is provided with a first opening and closing electric control valve linked with a pressure sensor at the lower end in the buffer tank (20);
an outlet pipeline communicated with the condensing tower (30) is communicated with the upper part of the side wall of the buffer tank (20), and a second opening and closing electric control valve linked with a pressure sensor at the upper end in the buffer tank (20) is arranged on the outlet pipeline;
the center of the bottom of the buffer tank (20) is communicated with a liquid discharge pipeline communicated with the connecting pipelines of the condensing tower (30) and the gas-liquid separator (40), and the liquid discharge pipeline is provided with a third opening and closing electric control valve linked with a pressure sensor at the lower end in the buffer tank (20).
7. The acrolein production exhaust gas treatment device according to claim 6, wherein:
a three-way pipe fitting (60) is arranged at the joint of the liquid discharge pipeline, the condensing tower (30) and the gas-liquid separator (40), and a pressure sensor is arranged at the upper part in the gas-liquid separator (40);
a fourth opening and closing electric control valve linked with a pressure sensor at the lower end in the buffer tank (20) is arranged on a pipeline of the three-way pipe fitting (60) communicated with the condensing tower (30);
a fifth opening and closing electric control valve linked with a pressure sensor in the gas-liquid separator (40) is arranged on a pipeline of the three-way pipe (60) communicated with the gas-liquid separator (40);
and a gas phase outlet (43) of the gas-liquid separator (40) is connected with a connecting pipeline of the gas mixer (50) through a flow meter and an adjusting electric control valve in sequence, and the adjusting electric control valve is electrically linked with the flow meter.
8. The acrolein production exhaust gas treatment device according to claim 1, wherein:
the condensing tower (30) is arranged as a multistage cooling tower and sequentially arranged from top to bottom, and comprises a primary cooling tower (30-A) and a secondary cooling tower (30-B) … … N-stage cooling tower (30-N):
the primary cooling tower (30-A) comprises a high-pressure waste gas main inlet (301) communicated with the outlet end of the buffer tank (20), the outlet end of the primary cooling tower (30-A) is communicated to the inlet end of the secondary cooling tower (30-B) and is sequentially communicated to the N-stage cooling tower (30-N) according to the mode, and the outlet end of the N-stage cooling tower (30-N) is provided with a high-pressure waste gas main outlet (302) communicated with the gas-liquid separator (40);
the multistage cooling tower further comprises: the cooling medium inlet pipe (303) is used for collecting the cooling medium ports (32) at the upper end of the multi-stage cooling tower, and the cooling medium outlet pipe (304) is used for collecting the cooling medium ports (32) at the lower end of the multi-stage cooling tower.
9. The method according to claim 7, wherein the treatment of the exhaust gas from the acrolein production comprises:
the processing method comprises the following steps:
collecting, namely uniformly collecting the waste gas by a vacuum pump system in the acrolein production process, and storing the waste gas into a storage tank;
compressing, namely increasing the pressure of the waste gas collected in the storage tank by a multi-stage compression mode of the compressor (10), and filling the waste gas into the buffer tank (20);
condensing, wherein high-pressure waste gas in the buffer tank (20) enters a condensing tower (30) from a high-pressure waste gas port, the high-pressure waste gas is contacted with a pipe (34) introduced with a refrigerant to reduce the temperature, so that gas-phase acrolein in the high-pressure waste gas is condensed into liquid, and liquid-phase acrolein crude liquid and gas-phase waste gas in other states are discharged from a high-pressure waste gas outlet through the drainage of a radial flow plate (35);
absorbing, feeding liquid-phase acrolein crude liquid and other gas-phase waste gas into a tank body (41) of a gas-liquid separator (40) through a gas-liquid inlet (42), and separating gas from liquid through a high-pressure gas-liquid mixture by a filling bin (46): other waste gas enters the tank body (41) from the side wall of the packing bin (46) and is discharged from the gas phase outlet (43) through the mist catcher (47); the crude acrolein liquid flows out from the lower part of the packing bin (46) under the action of gravity to the lower part in the tank body (41) and is discharged from a liquid phase outlet (44) until the dehydration process for acrolein production;
and (3) burning, introducing other waste gas into a gas mixer (50) through a gas phase outlet (43), mixing the waste gas with air, spraying the mixed gas into a burning boiler for burning through a mixed gas discharging pipe (52) of the gas mixer (50), and returning heat generated by burning to the oxidation process for producing the acrolein in a hot steam mode.
10. The method according to claim 9, wherein the treatment of the exhaust gas from the acrolein production comprises:
the processing method further comprises the following steps:
through the multi-stage compression of the compressor (10), the physical state of the waste gas is changed, so that liquid-phase acrolein can be generated in the high-pressure waste gas filled into the buffer tank (20), meanwhile, two groups of pressure sensors arranged in the buffer tank (20) can judge the liquid level in the buffer tank (20) in a pressure difference mode, and after the liquid level reaches the liquid drainage standard, the first opening-closing electric control valve, the third opening-closing electric control valve and the fifth opening-closing electric control valve are controlled to be opened in an electric linkage mode, and the second opening-closing electric control valve and the fourth opening-closing electric control valve are controlled to be closed, so that the liquid-phase acrolein in the buffer tank (20) directly enters a gas-liquid separator (40), and then the steps of adsorption and incineration are sequentially carried out;
on the contrary, when the liquid level does not reach the liquid drainage standard, the first opening-closing electric control valve, the third opening-closing electric control valve and the fifth opening-closing electric control valve are controlled to be closed in an electric linkage mode, the second opening-closing electric control valve and the fourth opening-closing electric control valve are controlled to be opened, high-pressure waste gas enters the step of condensation, and then the steps of adsorption and incineration are sequentially carried out.
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