CN108159878A - A kind of raw fat refining exhaust gas treating method - Google Patents
A kind of raw fat refining exhaust gas treating method Download PDFInfo
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- CN108159878A CN108159878A CN201810067787.1A CN201810067787A CN108159878A CN 108159878 A CN108159878 A CN 108159878A CN 201810067787 A CN201810067787 A CN 201810067787A CN 108159878 A CN108159878 A CN 108159878A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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Abstract
The invention discloses a kind of raw fat refining exhaust gas treating methods, include the following steps, tail gas is entered by the air inlet of the first wash tower bottoms in the first scrubbing tower, after spray washing, exhaust gas is flowed out out of first scrubbing tower, and the air inlet of the second wash tower bottoms is entered after the entrainment in removing exhaust gas；After second scrubbing tower into the exhaust gas in the second scrubbing tower to carrying out cooling spray washing, exhaust gas is flowed out out of second scrubbing tower, enters liquid reducing chamber after removing the water entrainment in exhaust gas；After the indoor exhaust gas of descending liquid is condensed, exhaust gas is adsorbed by drawing out type adsorption photochemical catalysis degradation bed and photocatalytic degradation, rear exhaust gas up to standard discharge；Discharge outlet of the waste water through the first scrubbing tower that cooling spray washing generates enters progress fat water separation in fat separator, the waste water isolated is connected after heat exchanger exchanges heat by conduit with the spray washing device in the second scrubbing tower, the inventive structure is simple, it is easy to operate, pollution level is low, resource is saved, it is efficient.
Description
Technical field
The present invention relates to tail gas disposal technique field, more specifically, being a kind of raw fat refining exhaust gas treating method.
Background technology
In recent years, air pollution is increasingly severe, the control of atmosphere pollution and the necessarily FUTURE ENVIRONMENT science master that degrades
Want one of research direction.
Have for the common processing method of atmospheric air off-gas：Condensation method, absorption process, combustion method, catalysis method, absorption method etc..
Wherein, absorption method is condensed, which needs the freezing equipment set up, and investment is big, and high energy consumption, operating cost is big, together
Tail gas is still containing certain density organic matter after Shi Lengning, and secondary pollution is serious, therefore to low concentration treating tail gas this law very
It is few to use；Absorption process need to be equipped with the retracting devices such as heating parsing condensation, and installation volume is big, investment is larger, while also there are secondary
Pollution, clean-up effect are undesirable；Direct combustion method, energy consumption is big, and operating cost is higher；Running technology requirement is high, be difficult to control with
It grasps, it is difficult to promote；Flame combustion method, equipment is larger, and transport is inconvenient, and equipment price is high, and operating cost is high, for sulfur-bearing, halogen
Plain organic matter exhaust-gas treatment effect is poor；Production by Catalytic Combustion Process, some gas burning conditions are harsh, and high temperature, high-altitude and high water is needed to steam
Qi leel pressure, therefore catalyst must have higher activity, high thermal stability and higher hydrothermal stability and certain anti-
Poisoning capability；Activated carbon adsorption, non-refractory cannot keep good adsorption capacity under humidified condition, inflammable, comparatively fast reach
It is adsorbed to saturation and loses effectiveness；Bioanalysis generates secondary solid or liquid pollutant；Reaction unit takes up a large area, reacts
Time is longer, and efficiency is low；Plasma decomposition, plasma technique is in Litter processing procedure, required vacuum ring
Border brings certain technical barrier, is in conceptual phase now.Many researchs are just for single pollutant at present；
UV ultraviolet methods, removal efficiency is low, and accessible gaseous species are less；Biological island takes up a large area, and filler needs periodically more
It changes, process is difficult to control, and is susceptible to problem after running a period of time, the processing of hydrophobicity and recalcitrant substance is also deposited
In larger difficulty.
Industrial large size oil enterprises, which can invest large-scale exhaust gas processing device, can realize inexpensive tail gas clean-up, but right
In medium and small oil refining enterprise since production scale is small, it is not suitable for large-scale exhaust gas processing device.Medium and small oil refining enterprise more needs
Want Low investment, the effective vent gas treatment mode of low operating cost.
And (left blueness, the processing of Wang Wenlin oil-fat plants stink discuss [J] Chinese oils, 2014,39 (7) to document:79-
Although 81) method for the processing recorded in, the method treatment effeciency is slow, and waste of resource is mostly and required plant extraction liquid takes
With costliness, the document is cooled down in the middle using packed tower, grease condensation easily occurs, packed tower is caused to block；And the document
The exhaust gas of moisture is removed in the middle through composite photochemical catalysis device (containing PP segment of fiber and activated carbon fibre section) progress pre-treatment, then into
Enter composite photocatalyst metal nickel screen and carry out photocatalytic degradation, be unfavorable for the replacement of filtration core in equipment first, and need two steps
It is rapid to complete absorption and degradation, make exhaust-gas treatment more cumbersome.
Invention content
In order to insufficient more than making up, the present invention provides a kind of raw fat refining exhaust gas treating methods.
The scheme of the invention is：
A kind of raw fat refining exhaust gas treating method, includes the following steps：
The tail gas that the raw fat refining of step 1) generates is entered by the air inlet of the first wash tower bottoms in the first scrubbing tower, warp
After spray equipment spray washing in first scrubbing tower, exhaust gas is flowed out out of first scrubbing tower, after removing the entrainment in exhaust gas
Into the air inlet of the second wash tower bottoms；
After the second scrubbing tower of step 2) carries out cooling spray washing to entering the exhaust gas in the second scrubbing tower, exhaust gas is from second
It is flowed out in scrubbing tower, enters liquid reducing chamber after removing the water entrainment in exhaust gas；
After the exhaust gas sedimentation removing entrainment water droplet entered in step 3) liquid reducing chamber, exhaust gas is uniformly divided by gas distributor
Enter drawing out type absorption-photocatalysis bed after cloth and carry out the organic odorous substance of adsorption photochemical catalysis degradation, rear exhaust gas discharge up to standard；
Step 4) discharge outlet of the waste water through the second scrubbing tower that cooling spray washing generates in step 2) is washed into first
Tower to be washed to use as washings, the first scrubbing tower washes enters progress fat water separation in fat separator by discharge outlet,
The grease isolated carries out the utilization of resources, and the waste water isolated is after heat exchanger exchanges heat by conduit and the second scrubbing tower
Spray washing device connection, portion of washing water is into cesspool biochemical treatment.
As preferred technical solution, the spray equipment of the first scrubbing tower described in step 1) includes the first nozzle, first
Recycle pump group and first annular jet pipe, the first scrubbing tower inner top center is equipped with the first nozzle, in first scrubbing tower
Middle part is equipped with first annular jet pipe, and first nozzle is connected with first annular jet pipe by first circulation pump group and cooling tower respectively
Logical, the spray flux of first nozzle accounts for the 70-90% of first circulation pump group quantity of circulating water, the spray of the first annular jet pipe
Amount accounts for the 10-30% of first circulation pump group quantity of circulating water, and the entrainment includes solids and grease.
As preferred technical solution, the first circulation pump group passes through both ends point symmetrical on conduit and first annular jet pipe
The water inlet connection not set.
Cooling spray equipment, the cooling spray equipment are equipped with as preferred technical solution, in second scrubbing tower
Including the second nozzle, second circulation pump group and the second toroidal nozzle, the second scrubbing tower inner top center is equipped with the second nozzle,
Middle part is equipped with the second toroidal nozzle in second scrubbing tower, second nozzle and the second toroidal nozzle respectively with second circulation
Pump group connects, and the spray two of second nozzle accounts for the 40%-50% of second circulation pump group quantity of circulating water, the second annular spray
The spray flux of pipe accounts for the 50%-60% of second circulation pump circulation water.
As preferred technical solution, the second circulation pump group passes through both ends symmetrical on conduit and the second toroidal nozzle point
The water inlet connection not set.
As preferred technical solution, the drawing out type absorption-photocatalysis bed includes that activated carbon adsorption dress can be extracted
It puts, activated carbon adsorption device is cellular activated carbon, and the cellular activated carbon area load has photochemical catalyst.
As preferred technical solution, the tower diameter of first scrubbing tower and the second scrubbing tower, according to suitable void tower gas
Speed and gas phase flow rate, are obtained as the following formula,
In formula：Vs --- gas phase flow rate, m3/s；
D --- tower diameter, m；
U --- empty tower gas velocity, m/s.
As preferred technical solution, the step 1) is with removing the mist mode in exhaust gas to pass through silk screen in step 2)
Demister carries out the mist in removing exhaust gas.
As preferred technical solution, it is respectively equipped on the gas off-take of first scrubbing tower and the second scrubbing tower detachable
Wire mesh demister.
The present invention also provides a kind of raw fat refining tail gas treatment device, the processing equipment includes the first scrubbing tower, second
Scrubbing tower, wire mesh demister, first circulation pump group, second circulation pump group, cooling heat exchange device, fat separator, liquid reducing chamber, can
Extraction-type absorption-photocatalysis bed and photocatalytic degradation room, the exhaust gas of first scrubbing tower engage in this profession by wire mesh demister with
The air inlet connection of second scrubbing tower, first scrubbing tower and the second scrubbing tower are interior equipped with spray equipment, second washing
The exhaust gas of tower is engaged in this profession to be connected by wire mesh demister with the air inlet of liquid reducing chamber, the exhaust duct and photocatalytic degradation of the liquid reducing chamber
Drawing out type absorption-photocatalysis bed, the drawing out type absorption-photocatalysis bed are equipped in communication channel between the air inlet of room
It is connected between liquid reducing chamber by gas distributor, the waste liquid of first scrubbing tower excludes road and passes through fat separator and heat exchange
Device connects, and the heat exchanger is connected by second circulation pump group with the spray equipment in the second scrubbing tower, second scrubbing tower
Waste liquid outlet duct connected by first circulation pump group with the spray equipment in the first scrubbing tower.
As preferred technical solution, liquid reducing chamber is cool-down condensing device.
As preferred technical solution, photocatalytic degradation room is equipped with photocatalytic degradation device.
As preferred technical solution, the gas distributor includes the single channel of several bendings, and the single channel includes
Air inlet, gas outlet and catch liquid bath, the bend relief in the single channel is equipped with baffle close to air inlet side, the baffle with
The bend relief catches liquid bath described in being formed.
Advantageous effect of the present invention using washing recycling --- absorption --- by the way of degradation, recycles a large amount of in tail gas
Organic matter, the organic matter of a small amount of not washed recycling is then removed by way of absorption degradation in tail gas, reaches exhaust emissions
Standard, simple in structure, easy to operate, pollution level is low, saves resource, avoids wasting, efficient.
Description of the drawings
Fig. 1 is the process flow chart of the present invention；
Fig. 2 is the single channel structure diagram of gas distributor；
Fig. 3 is the circulation process figure of the first scrubbing tower；
1- gas outlets；2- air inlets；3- catches liquid bath.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Specific embodiment is closed, the present invention is further explained.
Embodiment one：
A kind of raw fat refining tail gas treatment device, the processing equipment include the first scrubbing tower, the second scrubbing tower, silk screen and remove
Foam device, first circulation pump group, second circulation pump group, cooling heat exchange device, fat separator, liquid reducing chamber, drawing out type absorption-light
Catalytic bed and photocatalytic degradation room, the exhaust gas of first scrubbing tower engage in this profession by wire mesh demister and the second scrubbing tower into
Gas port connects, and equipped with spray equipment in first scrubbing tower and the second scrubbing tower, the exhaust gas of second scrubbing tower is engaged in this profession logical
It crosses wire mesh demister to connect with the air inlet of liquid reducing chamber, between the exhaust duct of the liquid reducing chamber and photocatalytic degradation room air inlet
Drawing out type absorption-photocatalysis bed, the drawing out type absorption-lead between photocatalysis bed and liquid reducing chamber are equipped in communication channel
Gas distributor connection is crossed, the waste liquid of first scrubbing tower excludes road and connected by fat separator with heat exchanger, described to change
Hot device is connected by second circulation pump group with the spray equipment in the second scrubbing tower, and the waste liquid outlet duct of second scrubbing tower leads to
First circulation pump group is crossed to connect with the spray equipment in the first scrubbing tower.
As preferred technical solution, the gas distributor includes the single channel of several bendings, and the single channel includes
Air inlet 2, gas outlet 1 and catch liquid bath 3, the bent projection in the single channel is equipped with close to 2 side of air inlet and catches liquid bath 3, if
The single channel of dry bending, which is set up in parallel, makes gas be uniformly distributed into can extract adsorption photochemical catalysis bed, the gas distributor packet
The single channel of several bendings is included, the single channel includes air inlet 2, gas outlet 1 and catches liquid bath 3, the bending in the single channel
Protrusion is equipped with baffle close to 2 side of air inlet, the baffle and the bend relief formed it is described catch liquid bath 3, the baffle rises
It reduces flow velocity, prevent gas advection motion, form turbulent flow, be uniformly distributed gas, what is be formed simultaneously catches liquid bath 3 and can remove entrainment
Drop acts on.
Gas is first washed in the first scrubbing tower cools down and washes out entrained solid object and grease in gas, passes through silk screen foam removal
Entering the second scrubbing tower after device filtering, further cooling removes vapor.Then enter descending liquid after being filtered again with silk screen Despumation device
Room further settles steam, by the gas distributor gas of liquid reducing chamber even into drawing out type absorption-photocatalysis bed
The heterocycles organic matters such as the layer adsorption photochemical catalysis layer removing nitrogenous, sulphur of small molecule, tail gas emptying.
Wherein the first scrubbing tower and the second scrubbing tower tower diameter, according to suitable empty tower gas velocity and gas phase flow rate, are asked as the following formula
Go out,
In formula：Vs --- gas phase flow rate, m3/s；
D --- tower diameter, m；
U --- empty tower gas velocity, m/s；
Tail gas air quantity is 4000m3/ h, the tail gas air quantity are with reference to tail gas air quantity, which may be other numbers
It is worth tail gas air quantity, judges the unit for m further accordance with live tower diameter3/ h, non-Nm3/ h, it is understood that there may be problem, but it is following still with m3/h
It is calculated,
Do not include the washing void tower of tower internals in first scrubbing tower and the second scrubbing tower, there is no fillers and tower plate structure.
First order scrubbing tower, it is proposed that flow velocity takes low, and suitably to increase the time of contact of liquid phase, gas phase flow velocity takes 1m/s left
The right side, gas phase residence time take 5~10s
Then calculate
Tower diameter D=1.2m, tower height take 6m
Second level scrubbing tower, flow velocity take 1.5m/s, and the gas phase residence time takes 3~5s
Then calculate
Tower diameter D=1m, tower height take 5m.
The water of first scrubbing tower and the second scrubbing tower determine,
The raw tail gas for practicing technique is the high temperature containing organic matter, humid air (is ignored the thermodynamic behaviour of organic matter, only considered empty
Gas and water steam, and vapor ratio is 30%, air 70%).
The specific heat capacity of dry air be 0.247 (kcal/kg. DEG C), density 0.723kg/m3, 120 DEG C or so of saturated water
The specific heat capacity of steam be 0.527 (kcal/kg. DEG C), heat of vaporization 539kcal/kg, density 0.598kg/m3。
First order scrubbing tower will wash tail gas to 99 DEG C by 150 DEG C, and two level washing will be by tail gas by 99 DEG C of washings to 60
℃
Then first order scrubbing tower is by 4000m3/ h tail gas is cooled to 99 DEG C, need to discharge heat
The cooling heat of vapor：Q1=4000*0.3*0.598*0.527* (150-99)=18908.76kcal/h；
The cooling heat of air：Q2=4000*0.7*0.723*0.247* (150-99)=25001.34kcal/h；
In addition, first scrubbing tower, vapor are undergone phase transition, there are the heat of transformation, because there are vapor liquid equilibriums, it is impossible to complete liquid
Change, be calculating benchmark with liquefaction 70%.
Then Q3=4000*0.3*0.7*0.598*539=270750.5kcal/h
Finally, the heat that discharges of first order scrubbing tower needs is
Q1+Q2+Q3=314660.58kcal/h
The recirculated water temperature difference is calculated with 32~42 DEG C, and the specific heat of water is 0.997 (kcal/kg. DEG C),
Then the first scrubbing tower needs quantity of circulating water
M=314660.58/ (0.997*10)=31560.74kg/h
V=31560.74/1000=31.561m3/h
Then recirculated water caliber needs, flow velocity according to 1m/s,
D=0.1m
The heat of transformation is not present in second scrubbing tower, the hot Q5 of cooling of the hot Q4 of cooling, air comprising not liquefied vapor,
Q4=4000*0.3*0.3*0.598*0.527* (99-60)=4538.102kcal/h
Q5=4000*0.7*0.723*0.247* (99-60)=20001.07kcal/h
Then the second scrubbing tower finally discharges heat and is
Q4+Q5=24539.17kcal/h
The recirculated water temperature difference is calculated with 32~42 DEG C, and the specific heat of water is 0.997 (kcal/kg. DEG C),
Then second level washing needs quantity of circulating water
M=24539.17/ (0.997*10)=2461.301kg/h
V=2461.301/1000=2.461m3/h
Then recirculated water caliber needs, flow velocity according to 1m/s,
D=0.032m.
Flow therein,
To reserve allowance, the first circulation pump group flow selects 35m3/h, second level cycle pump group flow selection 5m3/
h。
By the selection of above-mentioned pump discharge, recirculated water caliber takes：Circulating water pipe is DN100mm in first scrubbing tower；Second washes
It is DN40mm to wash circulating water pipe in tower.
a:First scrubbing tower
Centrally disposed first nozzle of tower top, the first Annular Nozzle of tower middle part setting, first annular jet size select DN40,
Trepanning φ 5, hole center spacing 10mm, to increase spraying effect.
The first nozzle spray flux at top accounts for quantity of circulating water than 80%, the first Annular Nozzle spray flux accounting in tower
20%.
Then the sprinkle density of top showerhead is：
35*0.8/ (0.785*1.2*1.2)=24.77m3/ (m2.h)
b:Second scrubbing tower
Centrally disposed second nozzle of tower top, the second Annular Nozzle of tower middle part setting, the second Annular Nozzle diameter selection DN25,
Trepanning φ 5, hole center spacing 10mm, to increase spraying effect.
The second nozzle spray flux at top accounts for quantity of circulating water than 50%, the second Annular Nozzle spray flux accounting in tower
50%.
Then the sprinkle density of top showerhead is：
5*0.5/ (0.785*1*1)=3.18m3/ (m2.h).
Embodiment two：
The tail gas that the raw fat refining of step 1) generates is entered by the air inlet of the first wash tower bottoms in the first scrubbing tower, warp
After spray equipment spray washing in first scrubbing tower, exhaust gas is flowed out out of first scrubbing tower, after removing the entrainment in exhaust gas
Into the air inlet of the second wash tower bottoms；
After the second scrubbing tower of step 2) carries out cooling spray washing to entering the exhaust gas in the second scrubbing tower, exhaust gas is from second
It is flowed out in scrubbing tower, enters liquid reducing chamber after removing the water entrainment in exhaust gas；
It is by gas distributor that exhaust gas is equal after the exhaust gas entered in step 3) liquid reducing chamber carries out sedimentation removing entrainment water droplet
Even be distributed can extract the organic odorous substance of adsorption photochemical catalysis bed progress adsorption photochemical catalysis degradation with entrance after abjection entrained drip,
Exhaust gas discharge after up to standard；
Step 4) discharge outlet of the waste water through the second scrubbing tower that cooling spray washing generates in step 2) is washed into first
Tower to be washed to use as washings, the first scrubbing tower washes enters progress fat water separation in fat separator by discharge outlet,
The grease isolated carries out the utilization of resources, and the waste water isolated is after heat exchanger exchanges heat by conduit and the second scrubbing tower
The spray washing device connection, for portion of washing water into cesspool biochemical treatment, cold washing water is introduced into the second scrubbing tower drop
Temperature --- washing impurities in water it is less, can simple filtration used as washings into the first scrubbing tower --- the first scrubbing tower is washed
Wash water and enter fat separator --- send recycling (soapmaking etc.) outside after grease separation, lower floor's high-temperature wash water is after heat exchange
The second scrubbing tower is returned, if wherein impurity is excessive, part is shunted and enters cesspool purified treatment.
The adsorption photochemical catalysis bed that extracts includes that activated carbon adsorption device can be extracted, and when needing replacing, releasing needs
The old of cleaning extracts activated carbon adsorption device, changes new, and old regenerate, easy to operate, can extract activated carbon
Adsorbent equipment is cellular activated carbon, and the cellular activated carbon area load has photochemical catalyst, and the photochemical catalyst of area load is
TiO2, organic matter is adsorbed on surface using activated carbon high efficiency of additive capability, using photochemical catalyst efficient degradation, activity can be improved
Charcoal service life, and can efficient deodorizing.
As preferred technical solution, the spray equipment of the first scrubbing tower described in step 1) includes the first nozzle, first
Recycle pump group and first annular jet pipe, the first scrubbing tower inner top center is equipped with the first nozzle, in first scrubbing tower
Middle part is equipped with first annular jet pipe, and first nozzle is connected with first annular jet pipe by first circulation pump group and cooling tower respectively
Logical, the spray flux of first nozzle accounts for the 70-90% of first circulation pump group quantity of circulating water, the spray of the first annular jet pipe
Amount accounts for the 10-30% of first circulation pump group quantity of circulating water, and the entrainment includes solids and grease.
As preferred technical solution, the first circulation pump group passes through both ends point symmetrical on conduit and first annular jet pipe
The water inlet connection not set.
Cooling spray equipment, the cooling spray equipment are equipped with as preferred technical solution, in second scrubbing tower
Including the second nozzle, second circulation pump group and the second toroidal nozzle, the second scrubbing tower inner top center is equipped with the second nozzle,
Middle part is equipped with the second toroidal nozzle in second scrubbing tower, second nozzle and the second toroidal nozzle respectively with second circulation
Pump group connects, and the spray two of second nozzle accounts for the 40%-50% of second circulation pump group quantity of circulating water, the second annular spray
The spray flux of pipe accounts for the 50%-60% of second circulation pump circulation water.
As preferred technical solution, the second circulation pump group passes through both ends symmetrical on conduit and the second toroidal nozzle point
The water inlet connection not set.
Exhaust gas processed by the invention, the exhaust gas discharged after processing, stink removal efficiency reach more than 85%, discharge gas
Concentration is less than 20 (dimensionless).Discharge index meets《Discharge standard of air pollutants》(GB16297—1996)、《Stench
Pollutant emission standard》The odorant pollutant factory boundary mark of the newest environmental regulations of (GB 14554-1993) and local environmental protection administration is accurate
In new extension build secondary standard and 15m high altitude discharge standard values.
Basic principle, main feature and the advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent circle.
Claims (10)
1. a kind of raw fat refining exhaust gas treating method, which is characterized in that include the following steps：
The tail gas that the raw fat refining of step 1) generates is entered by the air inlet of the first wash tower bottoms in the first scrubbing tower, through first
After spray equipment spray washing in scrubbing tower, exhaust gas is flowed out out of first scrubbing tower, is entered after removing the entrainment in exhaust gas
The air inlet of second wash tower bottoms；
After the second scrubbing tower of step 2) into the exhaust gas in the second scrubbing tower to carrying out cooling spray washing, exhaust gas is washed from second
It is flowed out in tower, enters liquid reducing chamber after removing the water entrainment in exhaust gas；
After the exhaust gas settlement extrusion entrainment water droplet entered in step 3) liquid reducing chamber, after by gas distributor, exhaust gas is uniformly distributed
The organic odorous substance of adsorption photochemical catalysis degradation, rear exhaust gas discharge up to standard are carried out into drawing out type absorption-photocatalysis bed；
Step 4) discharge outlet of the waste water through the second scrubbing tower that cooling spray washing generates in step 2) enters the first scrubbing tower
It is used as washings, the first scrubbing tower washes enters progress fat water separation in fat separator, separation by discharge outlet
The grease that goes out carries out the utilization of resources, and the waste water isolated is after heat exchanger exchanges heat by described in conduit and the second scrubbing tower
Spray washing device connects, and portion of washing water is into cesspool biochemical treatment.
2. a kind of raw fat refining exhaust gas treating method as described in claim 1, it is characterised in that：First washes described in step 1)
The spray equipment for washing tower includes the first nozzle, first circulation pump group and first annular jet pipe, in the first scrubbing tower inner top
The heart is equipped with the first nozzle, and middle part is equipped with first annular jet pipe, first nozzle and first annular spray in first scrubbing tower
Pipe is connected respectively by first circulation pump group with cooling tower, and the spray flux of first nozzle accounts for first circulation pump group quantity of circulating water
70-90%, the spray flux of the first annular jet pipe accounts for the 10-30% of first circulation pump group quantity of circulating water, the entrainment
Including solids and grease.
3. a kind of raw fat refining exhaust gas treating method as claimed in claim 2, it is characterised in that：The first circulation pump group is led to
It crosses conduit and is connected with the water inlet that both ends symmetrical on first annular jet pipe are set respectively.
4. a kind of raw fat refining exhaust gas treating method as described in claim 1, it is characterised in that：It is set in second scrubbing tower
There is a cooling spray equipment, the cooling spray equipment includes the second nozzle, second circulation pump group and the second toroidal nozzle, and described the
Two scrubbing tower inner top centers are equipped with the second nozzle, and middle part is equipped with the second toroidal nozzle in second scrubbing tower, and described second
Nozzle is connected with the second toroidal nozzle with second circulation pump group respectively, and the spray two of second nozzle accounts for second circulation pump group and follows
The 40%-50% of ring water, the spray flux of second toroidal nozzle account for the 50%-60% of second circulation pump circulation water.
5. a kind of raw fat refining exhaust gas treating method as described in claim 1, it is characterised in that：The second circulation pump group is led to
It crosses conduit and is connected with the water inlet that both ends symmetrical on the second toroidal nozzle are set respectively.
6. a kind of raw fat refining exhaust gas treating method as described in claim 1, it is characterised in that：It is described to extract absorption-light
Catalytic bed includes that activated carbon adsorption device can be extracted, and can extract activated carbon adsorption device as cellular activated carbon, the honeycomb is lived
Property carbon surface bears photocatalyst-bearing.
7. a kind of raw fat refining exhaust gas treating method as described in claim 1, it is characterised in that：The step 1) and step 2)
The mode of mist in middle removing exhaust gas is the mist carried out by wire mesh demister in removing exhaust gas.
8. a kind of raw fat refining exhaust gas treating method as described in claim 1, it is characterised in that：First scrubbing tower and
Dismountable wire mesh demister is respectively equipped on the gas off-take of two scrubbing towers.
9. a kind of processing equipment for raw fat refining exhaust gas treating method as described in claim 1, it is characterised in that：It is described
Processing equipment includes the first scrubbing tower, the second scrubbing tower, wire mesh demister, first circulation pump group, second circulation pump group, cools down and change
Thermal, fat separator, liquid reducing chamber, drawing out type absorption-photocatalysis bed and photocatalytic degradation room, first scrubbing tower
Exhaust gas engage in this profession and connected by wire mesh demister with the air inlet of the second scrubbing tower, in first scrubbing tower and the second scrubbing tower
Equipped with spray equipment, the exhaust gas of second scrubbing tower is engaged in this profession to be connected by wire mesh demister with the air inlet of liquid reducing chamber, described
Drawing out type absorption-photocatalysis bed is equipped in communication channel between the exhaust duct of liquid reducing chamber and photocatalytic degradation room air inlet,
The drawing out type absorption-connected between photocatalysis bed and liquid reducing chamber by gas distributor, first scrubbing tower give up
Liquid excludes road and is connected by fat separator with heat exchanger, and the heat exchanger passes through in second circulation pump group and the second scrubbing tower
Spray equipment connects, and the waste liquid outlet duct of second scrubbing tower is filled by the spray in first circulation pump group and the first scrubbing tower
Put connection.
10. a kind of processing equipment for being used to give birth to fat refining exhaust gas treating method as claimed in claim 9, it is characterised in that：Institute
The single channel that gas distributor includes several bendings is stated, the single channel includes air inlet, gas outlet and catches liquid bath, single stream
Bend relief in road is equipped with baffle close to air inlet side, and the baffle and the bend relief, which are formed, described catches liquid bath.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111603909A (en) * | 2020-06-09 | 2020-09-01 | 福州市聚泰环境科技有限公司 | Tail gas treatment process in production of acidified oil |
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