CN111744347A - Waste gas treatment process for threonine production - Google Patents
Waste gas treatment process for threonine production Download PDFInfo
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- CN111744347A CN111744347A CN202010631762.7A CN202010631762A CN111744347A CN 111744347 A CN111744347 A CN 111744347A CN 202010631762 A CN202010631762 A CN 202010631762A CN 111744347 A CN111744347 A CN 111744347A
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Abstract
The invention relates to a waste gas treatment process for threonine production, which comprises the following steps: a, distributing waste gas; b, removing dust; c, collecting energy; d, buffer storage; e, filtering aerial fog; f, catalytic cracking; g, tail gas emission. The gas outlet of the high-energy electron beam device is connected with the same discharge device, the discharge device comprises a fan and a chimney, and the purified tail gas is discharged through the fan and the chimney. The method of the invention is used for treating the tail gas, effectively purifies the VOCs waste gas, and has the advantages of good treatment effect, low operation cost, no secondary pollution, simple and convenient operation, stable operation, 98% of oil smoke purification efficiency and more than 99% of VOCs odor purification efficiency. In addition, the wind power generation device can reduce the impact force of waste gas while collecting energy, and reduce the damage of the waste gas to the buffer tank, thereby prolonging the service life of the whole set of system equipment.
Description
Technical Field
The invention relates to the technical field of threonine production, and particularly relates to a waste gas treatment process for threonine production.
Background
Threonine is an essential amino acid, and is mainly used in the fields of medicines, chemical reagents, food enhancers, feed additives and the like. In the production process of threonine, a large amount of waste gas is generated, the components of the waste gas are mainly Volatile Organic Compounds (VOCs), and if the waste gas is not treated, the waste gas has great influence on the surrounding environment. The traditional natural gas burning mode is used for treating industrial waste gas, consumes a large amount of natural gas and oxygen, discharges harmful gases such as carbon monoxide and carbon dioxide, has low energy efficiency ratio, narrow application range, is inflammable and explosive, and does not completely treat tail gas. In addition, at exhaust-gas treatment's in-process, need cushion waste gas with the buffer tank, play the effect that reduces the wind speed, waste gas has very strong impact force before buffering, directly cushions, not only wastes the kinetic energy that contains in the waste gas, still causes the damage to the buffer tank to a certain extent to reduce the life of whole system equipment.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a waste gas treatment process for threonine production.
In order to achieve the purpose, the invention adopts the following technical scheme: a waste gas treatment process for threonine production comprises the following steps:
a exhaust gas distribution
The waste gas in the threonine protein production process has three sources which are respectively granulation bed tail gas, fluidized bed tail gas and tank area tail gas, the threonine protein production workshop is internally provided with three granulation beds, a fluidized bed, two evaporation feeding tanks, a zein receiving tank, two concentrated liquid tanks, an effect body CIP tank and a protein secondary condensing tank, the three granulation beds are respectively named as a granulation bed, a granulation bed and a granulation bed, the two evaporation feeding tanks, the zein receiving tank, the two concentrated liquid tanks, the effect body CIP tank and the protein secondary condensing tank are tank bodies in a tank area, the tail gas generated by the fluidized bed is divided into two parts which are respectively merged with the tail gas generated by the granulation bed and the tail gas generated by the granulation bed, the tank area tail gas is merged with the tail gas generated by the granulation bed to form three tail gas outlets, the three tail gas outlets are respectively named as a tail gas outlet, a granulation bed tail gas outlet, a condensate tank, A second tail gas outlet and a third tail gas outlet;
b dust removal
The tail gas of the first tail gas outlet, the second tail gas outlet and the third tail gas outlet is respectively discharged into three water bath dust removing devices, the upper part of one side of each water bath dust removing device is connected with an ozone injection device for containing an acidic aqueous solution, the upper part of the other side of each water bath dust removing device is connected with an ozone injection device for containing an alkaline aqueous solution, acidic aerial fog generated by the ozone injection device for containing the acidic aqueous solution can neutralize alkaline gas in the tail gas to be purified, and similarly, the alkaline aerial fog generated by the ozone injection device for containing the alkaline aqueous solution can neutralize the acidic gas in the tail gas to be purified, and the tail gas discharged from the first tail gas outlet, the second tail gas outlet and the third tail gas outlet is neutralized by acid and alkali while being subjected to water bath dust removal, so that the;
c energy harvesting
The tail gas to be purified after water bath dust removal is pumped into the same wind power generation device through the air pump, the kinetic energy of the tail gas to be purified is converted into electric energy, the impact force of the tail gas can be reduced while the energy is collected, and the damage of the tail gas to mechanical equipment is reduced;
d buffer storage
Pumping the tail gas after energy collection into a buffer tank for buffer storage, and playing a role in reducing the wind speed;
e aerosol filtration
Pumping the buffered tail gas into an aerosol filter for gas-liquid separation;
f catalytic cracking
Introducing gas in a buffer tank into a high-energy electron beam device and a photocatalytic reactor, wherein the photocatalytic reactor is positioned in the high-energy electron beam device, the high-energy electron beam device activates, ionizes and cracks macromolecular chains in waste gas by utilizing a large amount of charged ions and partial negative oxygen ions generated by a spiral high-energy electron beam, so that the macromolecular chains in the tail gas to be purified are decomposed, and a series of complex chemical reactions such as catalytic oxidation and the like are carried out to achieve the purposes of high efficiency, decomposition and purification, wherein the process is the first heavy treatment; the photocatalytic reactor carries out catalytic oxidation on waste gas molecules by using a photocatalytic technology to react hydroxyl ions and H2The O molecules are oxidized into hydroxyl radicals with strong oxidizing property, and the hydroxyl radicals can oxidize and degrade most organic pollutants and part of inorganic pollutants into H2O、CO2The organic small molecules and the corresponding inorganic ions are not harmful substances, and the process is the second stepAnd (6) processing. The exhaust gas after the two synergistic treatments reaches the emission standard, and in addition, the ozone injected into the exhaust gas by the ozone injection device can oxidize NO in the exhaust gas under the action of the high-energy electron beam device, so that the denitration is realized;
g tail gas emission
The gas outlet of the high-energy electron beam device is connected with the same discharge device, the discharge device comprises a fan and a chimney, and the purified tail gas is discharged through the fan and the chimney.
In the step a, the tail gas emission of the first granulation bed is 150000m3The tail gas emission of No. two granulation beds is 150000m3The tail gas emission of No. three granulation beds is 150000m3The discharge amount of the tail gas of the tank area is 4032m3/h。
In the step b, the water bath dust removal device comprises a water bath box body with two cavities, the two cavities of the water bath box body are respectively used for containing acidic aqueous solution and alkaline aqueous solution, the cavity for containing the acidic aqueous solution is called an acid bath cavity, the cavity for containing the alkaline aqueous solution is called an alkaline bath cavity, the axes of the acid bath cavity and the alkaline bath cavity are respectively provided with a vertical acid bath pipe and an alkaline bath pipe, the acid bath pipe and the alkaline bath pipe are both fixed on the water bath box body through connecting blocks, the upper end of the acid bath pipe extends out of the water bath box body, the upper end of the acid bath pipe is an air inlet of tail gas to be treated, the lower end of the acid bath pipe is connected with an internal hollow acid bath disc, the acid bath disc is suspended at the bottom of the acidic aqueous solution, the bottom surface of the acid bath disc is provided with a plurality of air outlets, the upper end of the alkaline bath pipe extends out of the water bath box body and is communicated, and the bottom surface of the alkali bath disc is provided with a plurality of air outlets, one side of the upper part of the acid bath cavity is connected with an aerial fog outlet of the ozone injection device for containing the acidic aqueous solution, and one side of the upper part of the alkali bath cavity is connected with an aerial fog outlet of the ozone injection device for containing the alkaline aqueous solution.
In the step b, the ozone injection device comprises an ozone tank for containing ozone, a screw air compressor, a liquid storage tank, a micron-sized dry fog machine and a power distribution cabinet, wherein a gas outlet of the ozone tank is connected with a gas inlet of the screw air compressor, a gas outlet of the screw air compressor is connected with a gas storage tank, a gas outlet of the gas storage tank and a water outlet of the liquid storage tank are respectively connected with a gas inlet and a water inlet of the micron-sized dry fog machine, the power distribution cabinet supplies power to the screw air compressor and the micron-sized dry fog machine, an aerosol outlet of the micron-sized dry fog machine is communicated with an inner cavity of.
In step c, the wind power generation device comprises a hollow and transversely placed cylindrical box body, the cylindrical box body is fixed on the ground through a supporting block, two ports of the cylindrical box body are sealed, an air inlet cylinder is arranged at one end in the cylindrical box body, one end of the air inlet cylinder is fixed on the cylindrical box body, a reducing acceleration cylinder is connected at the other end of the air inlet cylinder, the end with the larger diameter of the port of the reducing acceleration cylinder is connected with the air inlet cylinder, air outlets of the three water-bath dust removal devices are communicated with the air inlet cylinder through air outlet pipes, the air outlet pipes are connected with the air inlet cylinder along the tangential direction of the air inlet cylinder, the air outlet pipes connected with the air inlet cylinder are connected with the box wall of the cylindrical box body in a sealing manner, a horizontal generator is arranged in the middle of the cylindrical box body, the, the other end is connected with a second fan, three gas outlets are formed in the side wall of one end, away from the air inlet cylinder, of the cylindrical box body, the three gas outlets are respectively connected with three buffer tanks, and the wind power generation device can reduce the impact force of tail gas while collecting energy and reduce the damage of the tail gas to the buffer tanks.
The inner wall of the reducing accelerating cylinder is provided with a helical blade.
In the step e, the demister core of the aerosol filter is made of anti-oxidation polyurethane cotton and acid and alkali resistant water condensation paint, so that the service life and the corrosion resistance of the filter element are improved.
The demister core is of a wave-shaped multi-fold structure, so that the filtering area of mist foam is increased, when gas containing mist foam flows through the demister at a certain speed, the mist removal efficiency can be effectively improved, the gas basically does not contain the mist foam after passing through the demister, and the water capture factor coating with acid resistance and alkali resistance is coated on the filter screen carrier, so that the moisture proportion of the gas passing through the filter screen carrier is effectively controlled.
In step g, the high-energy electron beam device comprises a reactor shell and two low-temperature spiral plasma reactors positioned in the reactor shell, wherein one side of the reactor shell is provided with an ionization air inlet, the other side of the reactor shell is provided with an ionization air outlet, the two low-temperature spiral plasma reactors are distributed at two ends of the reactor shell, and an air uniform net is arranged between the two low-temperature spiral plasma reactors and fixedly connected with the inner wall of the reactor shell, the low-temperature spiral plasma reactor comprises a pair of electrode plates and a pair of pole bar plates, the pair of electrode plates are oppositely arranged, the pair of pole bar plates are respectively arranged at the outer sides of the electrode plates and are installed with the electrode plates together through insulating ceramic columns, cellular electrode cavities are uniformly distributed on the two electrode plates, a spiral barbed electrode bar is coaxially arranged in the center of each cellular electrode cavity, and two ends of each spiral barbed electrode bar are respectively arranged on the electrode bar plates; the spiral prickle electrode bar and the honeycomb electrode cavity are respectively connected with the anode and the cathode of an alternating current and direct current superposed power supply; the two electrode plates and the two electrode bar plates are connected with the negative electrode and the positive electrode of an alternating current-direct current superimposed power supply, the spiral burred electrode bar and the honeycomb-shaped electrode cavity are made of stainless steel materials, and the GMM hexagonal honeycomb body is solidified on the surface of the honeycomb-shaped electrode cavity.
The photocatalytic reactor comprises a photocatalytic block, a fixing frame is connected to the outer side of the photocatalytic block, the photocatalytic block is fixed in a reactor shell through the fixing frame, a plurality of parallel OH free radical cavities are formed in the photocatalytic block, a photo-oxidation catalytic lamp tube is installed in the center of each OH free radical cavity, a screen plate used for fixing the photo-oxidation catalytic lamp tube is arranged on each of two sides of the photocatalytic block, the screen plates are fixed on the photocatalytic block, and ion-modified OH-based catalytic oxidation material coatings are arranged on the surfaces of the OH free radical cavities.
The photocatalytic reactor is positioned at the left side of the two low-temperature spiral plasma reactors.
The photocatalytic reactor is positioned at the right side of the two low-temperature spiral plasma reactors.
The photocatalytic reactor is positioned between the two low-temperature spiral plasma reactors.
The invention has the beneficial effects that: the high-energy electron beam device and the photocatalytic reactor can remove the odor polluting the environment in the discharged tail gas, reduce the pollution to the environment and are beneficial to the safe and long-term operation of waste gas treatment equipment. The method of the invention is used for treating the tail gas, effectively purifies and treats the VOCs waste gas (containing malodorous gas), and has the advantages of good treatment effect, low operation cost, no secondary pollution, simple operation, stable operation, 98 percent of purification efficiency of the fume and more than 99 percent of purification efficiency of the VOCs malodorous gas. In addition, the wind power generation device can reduce the impact force of waste gas while collecting energy, and reduce the damage of the waste gas to the buffer tank, thereby prolonging the service life of the whole set of system equipment.
Ozone injection device not only can fully neutralize acid gas and alkaline gas in the waste gas, and the aerial fog that ozone injection device generated can also adsorb the dust in the waste gas, provides comparatively clean waste gas for catalytic cracking to increase catalytic cracking's efficiency, in addition, ozone that ozone injection device injected into in the waste gas has superstrong oxidability, can oxidize comparatively intractable nitric oxide gas, improvement exhaust purification's quality.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a schematic structural view of a dust removing device with a water bath;
FIG. 3 is a schematic structural view of an ozone injection device;
FIG. 4 is a schematic structural view of a wind power plant;
FIG. 5 is a schematic diagram of a high-energy electron beam device;
FIG. 6 is a schematic diagram of the structure of a low temperature helical plasma reactor;
FIG. 7 is an enlarged schematic view at A of FIG. 5;
in the figure: 1-a water bath dust removal device; 11-a water bath box body; 12-acid bath cavity; 13-an alkali bath cavity; 14-acid bath tube; 15-alkali bath tube; 16-acid bath disk; 17-alkali bath disc; 2-an ozone injection device; 21-an ozone tank; 22-screw air compressor; 23-a gas storage tank; 24-micron dry fogging machine; 25-a power distribution cabinet; 26-a liquid storage tank; 3-a wind power generation device; 31-a cylindrical box; 32-an air inlet cylinder; 33-a variable-diameter acceleration cylinder; 34-a generator; 35-a connecting rod; 36-fan number one; 37-fan number two; 38-gas outlet; 39-helical blades; 4-a high energy electron beam device; 41-a reactor shell; 42-low temperature spiral plasma reactor; 421-an electrode body plate; 422-pole bar plate; 423-insulating porcelain column; 424-honeycomb electrode chambers; 425-spiral barbed pole stick; 43-ionization air inlet; 44-an ionization air outlet; 45-air homogenizing net; 5-a photocatalytic reactor; 51-a photocatalytic block; 52-a fixed frame; a 53-OH free radical cavity; 54-photo-oxygen catalytic lamp tube; 55-a screen plate;
the following detailed description will be made in conjunction with embodiments of the present invention with reference to the accompanying drawings.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
as shown in fig. 1 to 7, a process for treating waste gas for threonine production, comprising the steps of:
a exhaust gas distribution
The waste gas in the threonine protein production process has three sources which are respectively granulation bed tail gas, fluidized bed tail gas and tank area tail gas, the threonine protein production workshop is internally provided with three granulation beds, a fluidized bed, two evaporation feeding tanks, a zein receiving tank, two concentrated liquid tanks, an effect body CIP tank and a protein secondary condensing tank, the three granulation beds are respectively named as a granulation bed, a granulation bed and a granulation bed, the two evaporation feeding tanks, the zein receiving tank, the two concentrated liquid tanks, the effect body CIP tank and the protein secondary condensing tank are tank bodies in a tank area, the tail gas generated by the fluidized bed is divided into two parts which are respectively merged with the tail gas generated by the granulation bed and the tail gas generated by the granulation bed, the tank area tail gas is merged with the tail gas generated by the granulation bed to form three tail gas outlets, the three tail gas outlets are respectively named as a tail gas outlet, a granulation bed tail gas outlet, a condensate tank, A second tail gas outlet and a third tail gas outlet;
b dust removal
The tail gas outlet I, the tail gas outlet II and the tail gas outlet III are respectively discharged into three water bath dust removing devices, the upper part of one side of the water bath dust removing device 1 is connected with an ozone injection device 2 containing an acidic aqueous solution, the upper part of the other side of the water bath dust removing device 1 is connected with an ozone injection device 2 containing an alkaline aqueous solution, acidic aerial fog generated by the ozone injection device 2 containing the acidic aqueous solution can neutralize alkaline gas in the tail gas to be purified, and similarly, the alkaline aerial fog generated by the ozone injection device 2 containing the alkaline aqueous solution can neutralize the acidic gas in the tail gas to be purified, the tail gas outlet I, the tail gas outlet II and the tail gas outlet III are discharged during water bath dust removal and are neutralized by acid and alkali, so that the purification efficiency of the tail gas to be purified is improved;
c energy harvesting
The tail gas to be purified after water bath dust removal is pumped into the same wind power generation device 3 through the air pump, the kinetic energy of the tail gas to be purified is converted into electric energy, the impact force of the tail gas can be reduced while the energy is collected, and the damage of the tail gas to mechanical equipment is reduced;
d buffer storage
Pumping the tail gas after energy collection into a buffer tank for buffer storage, and playing a role in reducing the wind speed;
e aerosol filtration
Pumping the buffered tail gas into an aerosol filter for gas-liquid separation;
f catalytic cracking
Introducing gas in a buffer tank into a high-energy electron beam device 4 and a photocatalytic reactor 5, wherein the photocatalytic reactor 5 is positioned in the high-energy electron beam device 4, the high-energy electron beam device 4 activates, ionizes and cracks macromolecular chains in waste gas by utilizing a large amount of charged ions and partial negative oxygen ions generated by a spiral high-energy electron beam, so that the macromolecular chains in the tail gas to be purified are decomposed, and the aims of high efficiency, decomposition and purification are achieved through a series of complex chemical reactions such as catalytic oxidation and the like, wherein the process is a first heavy treatment; the photocatalytic reactor 5 uses the photocatalytic technology to perform catalytic oxidation on the exhaust gas molecules to remove hydroxyl ions and H2The O molecules are oxidized into hydroxyl radicals with strong oxidizing property, and the hydroxyl radicals can oxidize and degrade most organic pollutants and part of inorganic pollutants into H2O、CO2And (3) waiting for organic small molecules and corresponding inorganic ions and other harmless substances, wherein the process is a second treatment. After dual co-processingIn addition, the ozone filled into the tail gas by the ozone injection device 2 can oxidize NO in the tail gas under the action of the high-energy electron beam device 4, so as to realize the denitration;
g tail gas emission
The gas outlet of the high-energy electron beam device 4 is connected with the same discharge device, the discharge device comprises a fan and a chimney, and the purified tail gas is discharged through the fan and the chimney.
In the step a, the tail gas emission of the first granulation bed is 150000m3The tail gas emission of No. two granulation beds is 150000m3The tail gas emission of No. three granulation beds is 150000m3The discharge amount of the tail gas of the tank area is 4032m3/h。
In the step b, the water bath dust removing device 1 comprises a water bath box body 11 with two cavities, the two cavities of the water bath box body 11 are respectively used for containing acidic aqueous solution and alkaline aqueous solution, the cavity for containing the acidic aqueous solution is called an acid bath cavity 12, the cavity for containing the alkaline aqueous solution is called an alkaline bath cavity 13, the axial lines of the acid bath cavity 12 and the alkaline bath cavity 13 are respectively provided with a vertical acid bath pipe 14 and an alkaline bath pipe 15, the acid bath pipe 14 and the alkaline bath pipe 15 are both fixed on the water bath box body 11 through connecting blocks, the upper end of the acid bath pipe 14 extends out of the water bath box body 11, the upper end of the acid bath pipe 14 is an air inlet of tail gas to be treated, the lower end of the acid bath pipe 14 is connected with an internal hollow acid bath disc 16, the acid bath disc 16 is suspended at the bottom of the acidic aqueous solution, the bottom surface of the acid bath disc 16 is provided with a plurality of air outlet holes, the upper end, the lower end of the alkali bath tube 15 is connected with an internal hollow alkali bath disc 17, the alkali bath disc 17 is suspended at the bottom of the alkaline aqueous solution, a plurality of air outlets are formed in the bottom surface of the alkali bath disc 17, one side of the upper part of the acid bath cavity 12 is connected with an air fog outlet of the ozone injection device 2 containing the acidic aqueous solution, and one side of the upper part of the alkali bath cavity 13 is connected with an air fog outlet of the ozone injection device 2 containing the alkaline aqueous solution.
In the step b, the ozone injection device 2 comprises an ozone tank 21 for containing ozone, a screw air compressor 22, a liquid storage tank 26, a micron-sized dry fog machine 24 and a power distribution cabinet 25, wherein a gas outlet of the ozone tank 21 is connected with a gas inlet of the screw air compressor 22, a gas outlet of the screw air compressor 22 is connected with a gas storage tank 23, a gas outlet of the gas storage tank 23 and a water outlet of the liquid storage tank 26 are respectively connected with a gas inlet and a water inlet of the micron-sized dry fog machine 24, the power distribution cabinet 25 supplies power to the screw air compressor 22 and the micron-sized dry fog machine 24, a mist outlet of the micron-sized dry fog machine 24 is communicated with an inner cavity of the.
In the step c, the wind power generation device 3 comprises a cylindrical box 31 which is hollow inside and is transversely placed, the cylindrical box 31 is fixed on the ground through a supporting block, two ports of the cylindrical box 31 are sealed, an air inlet cylinder 32 is arranged at one end in the cylindrical box 31, one end of the air inlet cylinder 32 is fixed on the cylindrical box 31, the other end of the air inlet cylinder is connected with a variable-diameter acceleration cylinder 33, the end with the larger diameter of the port of the variable-diameter acceleration cylinder 33 is connected with the air inlet cylinder 32, air outlets of the three water-bath dust removal devices 1 are communicated with the air inlet cylinder 32 through air outlet pipes, the air outlet pipes are connected with the air inlet cylinder 32 along the tangential direction of the air inlet cylinder 32, the air outlet pipes connected with the air inlet cylinder 32 are hermetically connected with the box wall of the cylindrical box 31, a horizontal generator 34 is arranged in the middle of the cylindrical box 31, one end of a rotating shaft of the generator 34 is connected with a first fan 36, the other end of the rotating shaft is connected with a second fan 37, three gas outlets 38 are arranged on the side wall of one end, away from the air inlet cylinder 32, of the cylindrical box body 31, the three gas outlets 38 are respectively connected with three buffer tanks, the wind power generation device 3 can reduce the impact force of tail gas while collecting energy, and the damage of the tail gas to the buffer tanks is reduced.
The inner wall of the reducing acceleration cylinder 33 is provided with a helical blade 39.
In the step e, the demister core of the aerosol filter is made of anti-oxidation polyurethane cotton and acid and alkali resistant water condensation paint, so that the service life and the corrosion resistance of the filter element are improved.
The demister core is of a wave-shaped multi-fold structure, so that the filtering area of mist foam is increased, when gas containing mist foam flows through the demister at a certain speed, the mist removal efficiency can be effectively improved, the gas basically does not contain the mist foam after passing through the demister, and the water capture factor coating with acid resistance and alkali resistance is coated on the filter screen carrier, so that the moisture proportion of the gas passing through the filter screen carrier is effectively controlled.
In step g, the high-energy electron beam device 4 comprises a reactor shell 41 and two low-temperature spiral plasma reactors 42 positioned in the reactor shell 41, wherein one side of the reactor shell 41 is provided with an ionization air inlet 43, the other side of the reactor shell 41 is provided with an ionization air outlet 44, the two low-temperature spiral plasma reactors 42 are distributed at two ends of the reactor shell 41, an air-homogenizing net 45 is arranged between the two low-temperature spiral plasma reactors 42, the air-homogenizing net 45 is fixedly connected with the inner wall of the reactor shell 41, the low-temperature spiral plasma reactor 42 comprises a pair of electrode plates 421 and a pair of pole plates 422, the pair of electrode plates 421 are oppositely arranged, the pair of pole plates 422 are respectively arranged at the outer sides of the electrode plates 421 and are installed together with the electrode plates 421 through insulating ceramic columns 423, cellular electrode cavities 424 are uniformly distributed on the two electrode plates 421, a spiral burred pole rod 425 is coaxially installed in the center of each cellular electrode cavity 424, two ends of the spiral barbed pole bar 425 are respectively arranged on the pole bar plate 422; the spiral prickle pole rod 425 and the honeycomb-shaped electrode cavity 424 are respectively connected with the positive pole and the negative pole of an alternating current and direct current superposition power supply; the two electrode body plates 421 and the two electrode rod plates 422 are connected with the negative electrode and the positive electrode of an alternating current and direct current superposition power supply, the spiral barbed electrode rod 425 and the honeycomb-shaped electrode cavity 424 are both made of stainless steel materials, and the GMM hexagonal honeycomb body is solidified on the surface of the honeycomb-shaped electrode cavity 424.
The photocatalytic reactor 5 comprises a photocatalytic block 51, a fixing frame 52 is connected to the outer side of the photocatalytic block 51, the photocatalytic block 51 is fixed in the reactor shell 41 through the fixing frame 52, a plurality of parallel OH free radical cavities 53 are formed in the photocatalytic block 51, a photocatalytic light tube 54 is installed in the center of each OH free radical cavity 53, two mesh plates 55 used for fixing the photocatalytic light tube 54 are respectively arranged on two sides of the photocatalytic block 51, the mesh plates 55 are fixed on the photocatalytic block 51, and ion-modified OH free radical catalytic oxidation material coatings are arranged on the surfaces of the OH free radical cavities 53.
The photocatalytic reactor 5 is located on the left side of the two low temperature helical plasma reactors 42.
The photocatalytic reactor 5 is located on the right side of the two low temperature helical plasma reactors 42.
The photocatalytic reactor 5 is located between two low temperature helical plasma reactors 42.
The high-energy electron beam device 4 and the photocatalytic reactor 5 can remove the odor polluting the environment in the discharged tail gas, reduce the pollution to the environment and are beneficial to the safe and long-term operation of waste gas treatment equipment. The method of the invention is used for treating the tail gas, effectively purifies the VOCs waste gas, and has the advantages of good treatment effect, low operation cost, no secondary pollution, simple and convenient operation, stable operation, 98% of oil smoke purification efficiency and more than 99% of VOCs odor purification efficiency. In addition, the wind power generation device 3 can reduce the impact force of waste gas while collecting energy, and reduce the damage of the waste gas to the buffer tank, thereby prolonging the service life of the whole set of system equipment.
The invention has been described in connection with the accompanying drawings, it is to be understood that the invention is not limited to the specific embodiments disclosed, but is intended to cover various modifications, adaptations or uses of the invention, and all such modifications and variations are within the scope of the invention.
Claims (10)
1. A waste gas treatment process for threonine production is characterized by comprising the following steps:
a exhaust gas distribution
The waste gas in the threonine protein production process has three sources which are respectively granulation bed tail gas, fluidized bed tail gas and tank area tail gas, the threonine protein production workshop is internally provided with three granulation beds, a fluidized bed, two evaporation feeding tanks, a zein receiving tank, two concentrated liquid tanks, an effect body CIP tank and a protein secondary condensing tank, the three granulation beds are respectively named as a granulation bed, a granulation bed and a granulation bed, the two evaporation feeding tanks, the zein receiving tank, the two concentrated liquid tanks, the effect body CIP tank and the protein secondary condensing tank are tank bodies in a tank area, the tail gas generated by the fluidized bed is divided into two parts which are respectively merged with the tail gas generated by the granulation bed and the tail gas generated by the granulation bed, the tank area tail gas is merged with the tail gas generated by the granulation bed to form three tail gas outlets, the three tail gas outlets are respectively named as a tail gas outlet, a granulation bed tail gas outlet, a condensate tank, A second tail gas outlet and a third tail gas outlet;
b dust removal
The tail gas outlet I, the tail gas outlet II and the tail gas outlet III are respectively discharged into three water bath dust removing devices, the upper part of one side of each water bath dust removing device (1) is connected with an ozone injection device (2) containing an acidic aqueous solution, the upper part of the other side of each water bath dust removing device (1) is connected with an ozone injection device (2) containing an alkaline aqueous solution, acid aerial fog generated by the ozone injection device (2) containing the acidic aqueous solution can neutralize alkaline gas in the tail gas to be purified, and similarly, the acid aerial fog generated by the ozone injection device (2) containing the alkaline aqueous solution can neutralize the acidic gas in the tail gas to be purified, and the tail gas discharged from the tail gas outlet I, the tail gas outlet II and the tail gas outlet III is subjected to acid-base neutralization while being subjected to water bath dust removal, so that the purification efficiency of the tail;
c energy harvesting
Tail gas to be purified after water bath dust removal is pumped into the same wind power generation device (3) through an air pump, kinetic energy of the tail gas to be purified is converted into electric energy, the impact force of the tail gas can be reduced while the energy is collected, and the damage of the tail gas to mechanical equipment is reduced;
d buffer storage
Pumping the tail gas after energy collection into a buffer tank for buffer storage, and playing a role in reducing the wind speed;
e aerosol filtration
Pumping the buffered tail gas into an aerosol filter for gas-liquid separation;
f catalytic cracking
Introducing gas in a buffer tank into a high-energy electron beam device (4) and a photocatalytic reactor (5), wherein the photocatalytic reactor (5) is positioned in the high-energy electron beam device (4), the high-energy electron beam device (4) activates, ionizes and cracks macromolecular chains in waste gas by utilizing a large amount of charged ions and partial negative oxygen ions generated by a spiral high-energy electron beam, so that the macromolecular chains in the tail gas to be purified are decomposed, and the aims of high efficiency, decomposition and purification are fulfilled through a series of complex chemical reactions such as catalytic oxidation, and the like; the photocatalytic reactor (5) utilizes the photocatalytic technology to carry out catalytic oxidation on the waste gas molecules to react hydroxyl ions and H2The O molecules are oxidized into hydroxyl radicals with strong oxidizing property, and the hydroxyl radicals can oxidize and degrade most organic pollutants and part of inorganic pollutants into H2O、CO2And (3) waiting for organic small molecules and corresponding inorganic ions and other harmless substances, wherein the process is a second treatment. The exhaust gas after the two synergistic treatments reaches the emission standard, and in addition, the ozone injected into the exhaust gas by the ozone injection device (2) can oxidize NO in the exhaust gas under the action of the high-energy electron beam device (4), so that the denitration is realized;
g tail gas emission
The gas outlet of the high-energy electron beam device (4) is connected with the same discharge device, the discharge device comprises a fan and a chimney, and the purified tail gas is discharged through the fan and the chimney.
2. The waste gas treatment process for threonine production according to claim 1, wherein the emission of tail gas from the granulation bed # I in step a is 150000m3The tail gas emission of No. two granulation beds is 150000m3The tail gas emission of No. three granulation beds is 150000m3The discharge amount of the tail gas of the tank area is 4032m3/h。
3. The waste gas treatment process for threonine production according to claim 1, wherein in step b, the water bath dust removal device (1) comprises a water bath tank (11) with two cavities, the two cavities of the water bath tank (11) are respectively filled with an acidic aqueous solution and an alkaline aqueous solution, the cavity filled with the acidic aqueous solution is called an acid bath cavity (12), the cavity filled with the alkaline aqueous solution is called an alkaline bath cavity (13), the axes of the acid bath cavity (12) and the alkaline bath cavity (13) are respectively provided with a vertical acid bath pipe (14) and an alkaline bath pipe (15), the acid bath pipe (14) and the alkaline bath pipe (15) are both fixed on the water bath tank (11) through connecting blocks, the upper end of the acid bath pipe (14) extends out of the water bath tank (11), the upper end of the acid bath pipe (14) is an air inlet of the tail gas to be treated, and the lower end of the acid bath pipe (14) is connected with an internal hollow acid bath disc (16, acid bath disc (16) is unsettled to be located the acid aqueous solution bottom, and acid bath disc (16) bottom surface is equipped with a plurality of ventholes, water bath box (11) are stretched out to alkali bath pipe (15) upper end, and stretch out the back and communicate with acid bath cavity (12) top, alkali bath pipe (15) lower extreme even has inside cavity alkali bath disc (17), alkali bath disc (17) are unsettled to be located the alkaline aqueous solution bottom, and alkali bath disc (17) bottom surface is equipped with a plurality of ventholes, acid bath cavity (12) upper portion one side and the aerial fog exit linkage that holds ozone injection device (2) of acid aqueous solution, alkali bath cavity (13) upper portion one side and the aerial fog exit linkage that holds ozone injection device (2) of alkaline aqueous solution.
4. The waste gas treatment process for threonine production according to claim 3, wherein, in step b, ozone injection device (2) is including ozone tank (21) that holds ozone, screw air compressor machine (22), liquid storage pot (26), micron order dry fog machine (24) and switch board (25), the gas outlet of ozone tank (21) is connected with the air inlet of screw air compressor machine (22), the gas outlet of screw air compressor machine (22) even has gas holder (23), the gas outlet of gas holder (23) and the delivery port of liquid storage pot (26) are connected with the air inlet and the water inlet of micron order dry fog machine (24) respectively, switch board (25) are for screw air compressor machine (22) and micron order dry fog machine (24) power supply, the aerial fog export and the water bath box (11) inner chamber intercommunication of micron order dry fog machine (24), liquid storage pot (26) are used for containing acid aqueous solution or alkaline aqueous solution.
5. The waste gas treatment process for threonine production according to claim 4, wherein in step c, the wind power generation device (3) comprises a hollow and horizontally placed cylindrical box body (31), the cylindrical box body (31) is fixed on the ground through a support block, two ports of the cylindrical box body (31) are sealed, an air inlet cylinder (32) is arranged at one end in the cylindrical box body (31), one end of the air inlet cylinder (32) is fixed on the cylindrical box body (31), the other end of the air inlet cylinder is connected with a reducing acceleration cylinder (33), the end with the larger port diameter of the reducing acceleration cylinder (33) is connected with the air inlet cylinder (32), air outlets of the three water bath dust removal devices (1) are communicated with the air inlet cylinder (32) through air outlet pipes, the air outlet pipes are connected with the air inlet cylinder (32) along the tangential direction of the air inlet cylinder (32), and the air outlet pipes connected with the air inlet cylinder (32) are hermetically connected with the, the middle part of cylinder box (31) is equipped with horizontally generator (34), the lateral wall of generator (34) even has connecting rod (35) of a plurality of circumference equipartitions, generator (34) pass through connecting rod (35) and cylinder box (31) inner wall fixed connection, the one end of the rotation axis of generator (34) even has fan (36), the other end even has No. two fan (37), be equipped with three gas outlet (38) on the lateral wall of the one end of cylinder box (31) keeping away from air inlet cylinder (32), three gas outlet (38) are connected with three buffer tank respectively, wind power generation set (3) can reduce the impact force of tail gas when collecting the energy, reduce the damage of tail gas to the buffer tank.
6. The waste gas treatment process for threonine production according to claim 5, wherein the inner wall of the reducing acceleration cylinder (33) is provided with helical blades (39).
7. The waste gas treatment process for threonine production as claimed in claim 6, wherein in step e, the demister of the aerosol filter is made of antioxidant polyurethane cotton and acid and alkali resistant water-coagulation resistant paint, so as to improve the service life and corrosion resistance of the filter element.
8. The waste gas treatment process for threonine production as defined in claim 7, wherein the demister core has a corrugated multi-turn structure to increase the filtering area of the mist, the mist removal efficiency is effectively improved when the gas containing the mist flows through the demister at a certain speed, the gas passing through the demister is substantially free of the mist, and the filter screen carrier is coated with the acid and alkali resistant water capture factor coating to effectively control the moisture ratio of the gas passing through the demister.
9. The waste gas treatment process for threonine production according to claim 8, wherein in step g, the high-energy electron beam device (4) comprises a reactor shell (41) and two low-temperature spiral plasma reactors (42) arranged in the reactor shell (41), one side of the reactor shell (41) is provided with an ionization air inlet (43), the other side of the reactor shell is provided with an ionization air outlet (44), the two low-temperature spiral plasma reactors (42) are distributed at two ends of the reactor shell (41), an air-homogenizing net (45) is arranged between the two low-temperature spiral plasma reactors (42), the air-homogenizing net (45) is fixedly connected with the inner wall of the reactor shell (41), the low-temperature spiral plasma reactor (42) comprises a pair of electrode plate (421) and a pair of pole rod plates (422), the pair of electrode plate (421) is oppositely arranged, the pair of pole rod plates (422) are respectively arranged at the outer sides of the electrode plate (421) and are connected with the electrode plate (421) through an insulator (423) The electrode plates (421) are uniformly provided with honeycomb-shaped electrode cavities (424), the center of each honeycomb-shaped electrode cavity (424) is coaxially provided with a spiral barbed electrode rod (425), and two ends of each spiral barbed electrode rod (425) are respectively arranged on the electrode rod plates (422); the spiral prickle pole rod (425) and the honeycomb electrode cavity (424) are respectively connected with the anode and the cathode of an alternating current and direct current superposition power supply; the two electrode body plates (421) and the two electrode rod plates (422) are connected with the negative electrode and the positive electrode of an alternating current and direct current superposition power supply, the spiral barbed electrode rod (425) and the honeycomb-shaped electrode cavity (424) are both made of stainless steel materials, and the surface of the honeycomb-shaped electrode cavity (424) is solidified with a GMM hexagonal honeycomb body.
10. The waste gas treatment process for threonine production according to claim 9, wherein the photocatalytic reactor (5) comprises a photocatalytic block (51), the outer side of the photocatalytic block (51) is connected with a fixing frame (52), the photocatalytic block (51) is fixed in the reactor shell (41) through the fixing frame (52), the photocatalytic block (51) is provided with a plurality of parallel OH free radical cavities (53), the center of each OH free radical cavity (53) is provided with a photocatalytic lamp tube (54), two sides of the photocatalytic block (51) are respectively provided with a mesh plate (55) for fixing the photocatalytic lamp tube (54), the mesh plate (55) is fixed on the photocatalytic block (51), and the surface of the OH free radical cavity (53) is provided with an ion-modified OH-based catalytic oxidation material coating.
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