CN208626980U - The denitrification apparatus of the molten gold of wet process and/or Rong Yin workshop section flue gas - Google Patents
The denitrification apparatus of the molten gold of wet process and/or Rong Yin workshop section flue gas Download PDFInfo
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- CN208626980U CN208626980U CN201820648120.6U CN201820648120U CN208626980U CN 208626980 U CN208626980 U CN 208626980U CN 201820648120 U CN201820648120 U CN 201820648120U CN 208626980 U CN208626980 U CN 208626980U
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Abstract
The utility model provides a kind of molten golden and/or Rong Yin workshop section flue gas the denitrification apparatus of wet process.The denitrification apparatus includes: the first caustic wash unit, and saline solution exports after absorbing with smoke inlet, initial wash exhanst gas outlet and first；Oxidizing and denitrating ozone unit, has exhanst gas outlet after initial wash smoke inlet and oxidation, and initial wash smoke inlet is connected with initial wash exhanst gas outlet；And second caustic wash unit, have smoke inlet after oxidation, flue gas emission mouth and second absorb after saline solution export, smoke inlet and exhanst gas outlet is connected after aoxidizing after oxidation.The nitrogen oxides in flue gas absorb first with the first caustic wash unit and forms nitrate or nitrite and obtains initial wash flue gas；When carrying out denitration process to initial wash flue gas using oxidizing and denitrating ozone unit, the consumption of ozone can be reduced, the operating cost of denitrification apparatus is reduced.
Description
Technical field
The utility model relates to fume treatment fields, in particular to a kind of molten gold of wet process and/or Rong Yin workshop section flue gas
Denitrification apparatus.
Background technique
The wet process of precious metal smelting industry it is molten gold, the intermittently operated of Rong Yin workshop section, it is molten gold, it is molten silver during can just generate containing
The flue gas of nitrogen oxides, NO and NO in flue gas2Concentration with the consumption of nitric acid during molten sample, and change, NO2Concentration by
It is high to Low, NO concentration from low to high, wherein much part-time NO2Content occupies the majority, more than the 50% of nitrogen oxides total amount.
It is different from power plant's denitration flue gas, existing denitration technology, mainly SCR and SNCR technology, SCR denitration technology, by ammonia
Gas is injected into high-temperature flue gas denitrification apparatus as denitrfying agent, under the effect of the catalyst by NO in flue gasxIt is decomposed into N2With
H2O, reaction formula are as follows: 4NO+4NH3+O2→4N2+6H2O；NO+NO2+2NH3→2N2The above-mentioned two reaction of+3H2O is general logical
It crosses and is realized using catalyst appropriate, above-mentioned reaction can effectively carry out within the temperature range of 200 DEG C~450 DEG C, in NH3/
In the case where NO=1,80~90% denitration efficiency can achieve.SCR denitration technology works as front ring with its removal efficiency height, adaptation
Guaranteed request and obtain power industry pay much attention to and be widely applied.In the stringent developed country of environmental requirement such as Germany, day
The states such as sheet, the U.S., Canada, Holland, Austria, Sweden and Denmark SCR denitration technology has been using most, most mature skill
One of art.But the technology is needed using catalyst, and requires reaction temperature in 200 DEG C~450 DEG C ranges, and heavy metal smelts row
The molten gold of industry, the flue-gas temperature of Rong Yin workshop section discharge are about 30 DEG C~80 DEG C, if the temperature that flue gas to SCR is needed, energy
It consumes larger, increases the cost pressure of enterprise.SNCR denitration technology, by NH3, the reducing agents such as urea spray into Boiler Furnace and NOxIt carries out
Selective reaction, do not have to catalyst, it is therefore necessary to high-temperature region be added reducing agent, reducing agent spray into fire box temperature be 850~
1100 DEG C of region, rapid thermal decomposition is at NH3, with the NO in flue gasxReaction generates N2And water.SNCR gas denitrifying technology takes off
Nitre efficiency is generally 30%~80%, is influenced by boiler structure size very big.Using SNCR technology, current trend is to use urea
Instead of ammonia as reducing agent.Reaction principle: within the scope of 850~1100 DEG C, NH3Or urea restores NOxKey reaction are as follows:
NH3For reducing agent 4NH3+4NO+O2→4N2+6H2O
Urea is reducing agent NO+CO (NH2)2+1/2O2→2N2+CO2+H2O
The technology maturation is reliable, and reducing agent effective rate of utilization is high, and system run all right, EM equipment module takes up little area, no pair
Product and secondary pollution.But it is applied to the smoke gas treatment of precious metal smelting industry molten gold, Rong Yin workshop section, equally existing needs with SCR
The problem of heating flue gas, operating cost are higher.
In addition to this, NO in flue gas2Content is higher, and the consumption of reducing agent will increase in conventional scr and SNCR denitration technology
Greatly, ozone denitration is used instead, can solve the consumption of ozone, and reduction temperature needed for ozone denitration is lower, therefore makes
The operating cost of enterprise has been saved with ozone denitration.
Ozone denitration technology carries out open application in power plant, chemical industry, but has no molten golden, molten in precious metal smelting
It is applied in silver-colored workshop section's smoke gas treatment.This is because power plant, chemical industry nitrogen oxides in effluent concentration are generally more stable, it is convenient for
The implementation of ozone denitration application, in addition NO in flue gas2Concentration accounts for about NOxThe 5% of concentration.And the molten gold of precious metal smelting, Rong Yin workshop section
Extension of the flue gas with the molten sample time, the variation of nitrogen oxides in effluent one side concentration moment, another aspect NO2Early period concentration very
Height, peak concentration are about 15000mg/Nm3, with the growth in reaction time, NO2Concentration gradually decreases, and NO concentration gradually increases,
Finally it is maintained essentially at NO2/ NO concentration ratio is 1/1.Due to the molten gold of precious metal smelting, in Rong Yin workshop section flue gas NO content compared with
It is more, if carrying out denitration process with conventional ozone method of denitration, it will lead to enterprise investment height, operating cost height, enterprise can not receive,
And take up a large area, enterprise cannot achieve.
Utility model content
The main purpose of the utility model is to provide a kind of wet process it is molten gold and/or Rong Yin workshop section flue gas denitrification apparatus,
To solve the problems, such as that method of denitration is at high cost in the prior art.
To achieve the goals above, one aspect according to the present utility model provides a kind of molten gold of wet process and/or molten silver
The denitrification apparatus of workshop section's flue gas, the denitrification apparatus include: the first caustic wash unit, have smoke inlet, initial wash exhanst gas outlet
Saline solution exports after absorbing with first；Oxidizing and denitrating ozone unit has exhanst gas outlet after initial wash smoke inlet and oxidation, just
Secondary washing smoke inlet is connected with initial wash exhanst gas outlet；And second caustic wash unit, there is smoke inlet, flue gas after oxidation
Saline solution exports after discharge outlet and the second absorption, and smoke inlet is connected with exhanst gas outlet after oxidation after oxidation.
Further, above-mentioned first caustic wash unit includes: the first caustic wash tower, have the first alkali liquor inlet, smoke inlet, just
Saline solution exports after secondary washing exhanst gas outlet and the first absorption；First lye supply equipment, is connected with the first alkali liquor inlet；It is preferred that the
One caustic wash unit further includes the first flue gas analyzer, and smoke inlet is connected to detect the nitrogen oxygen in flue gas with the first flue gas analyzer
Compound concentration, the first lye supply equipment are connected with the first flue gas analyzer and adjust the supply of water according to nitrous oxides concentration
Amount.
Further, above-mentioned oxidizing and denitrating ozone unit includes: oxidizing and denitrating ozone reactor, with ozone inlet and just
Secondary washing smoke inlet；Ozone supplied equipment, is connected with ozone inlet；It is preferred that oxidizing and denitrating ozone unit further includes the second flue gas
Analyzer, initial wash smoke inlet are connected dense to detect the nitric oxide in initial wash flue gas with the second flue gas analyzer
Degree, ozone supplied equipment are connected with the second flue gas analyzer and adjust the supply of ozone according to nitric oxide concentration.
Further, above-mentioned second caustic wash unit includes: the second caustic wash tower, has flue gas after the second alkali liquor inlet, oxidation
Saline solution exports after entrance, flue gas emission mouth and second absorb；Second lye supply equipment, is connected with alkali liquor inlet；It is preferred that second
Caustic wash unit further includes third flue gas analyzer, and smoke inlet is connected to detect cigarette after oxidation with third flue gas analyzer after oxidation
Nitrous oxides concentration in gas, the second lye supply equipment are connected with third flue gas analyzer and are adjusted according to nitrous oxides concentration
The supply of lye.
Further, above-mentioned denitrification apparatus further include: evaporator there is dilute saline solution entrance and dense saline solution to export, dilute saline solution
Saline solution outlet is connected after entrance is absorbed with saline solution outlet after the first absorption and second；Crystallizer has dense saline solution entrance and by-product
Salt outlet, dense saline solution entrance are connected with the outlet of dense saline solution.
Using the technical solution of the utility model, contain in view of nitrogen dioxide in the molten gold of wet process and/or Rong Yin workshop section flue gas
Amount is universal higher, therefore absorb to the nitrogen oxides in flue gas first with the first caustic wash unit and form nitrate or nitrous
Hydrochlorate, the nitrogen oxides in the nitrogen oxides of obtained initial wash flue gas greatly reduce；Using oxidizing and denitrating ozone unit
When carrying out denitration process to initial wash flue gas, nitric oxide more fully can carry out haptoreaction with ozone, therefore can
It is more efficient it is low by oxidation of nitric oxide therein at nitrogen dioxide, and due to the setting of the first caustic wash unit so that in flue gas one
Nitrogen oxide reaches reduction, therefore can reduce the operating cost of denitrification apparatus in the consumption of this step reduction ozone；Then sharp
Second of alkali cleaning carried out to flue gas after oxidation with the second caustic wash unit, the remaining nitrogen oxides after lye and oxidation in flue gas into
Row, which absorbs, forms nitrate or nitrite, and gained saline solution can be used as semi-finished product or go out after processing as product
It sells, proceeds of sale further reduced the overall operation cost of denitrification apparatus.And after the processing of above-mentioned denitrification apparatus
Flue gas denitration standard is fully achieved, can be realized flue gas emission.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide a further understanding of the present invention, this is practical
Novel illustrative embodiments and their description are not constituteed improper limits to the present invention for explaining the utility model.
In the accompanying drawings:
Fig. 1 shows a kind of structural block diagram of denitrification apparatus for implementing to exemplify according to the present utility model.
Wherein, the above drawings include the following reference numerals:
01, acid solution configurator；
10, the first caustic wash unit；11, the first caustic wash tower；12, the first lye supply equipment；13, the first flue gas analyzer；
20, oxidizing and denitrating ozone unit；21, oxidizing and denitrating ozone reactor；22, ozone supplied equipment；23, the second flue gas
Analyzer；
30, the second caustic wash unit；31, the second caustic wash tower；32, the second lye supply equipment；33, third flue gas analyzer；
41, evaporator；42, crystallizer.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The utility model will be described in detail below with reference to the accompanying drawings and embodiments.
As the application background technique is analyzed, NO in the molten gold of precious metal smelting, Rong Yin workshop section flue gas2Content and NO content
Change as workshop section carries out, and is finally maintained essentially at NO2/ NO concentration ratio is 1/1, when using SCR and SNCR technology, by
In NO2Content is higher, and the consumption of reducing agent will will increase in conventional scr and SNCR denitration technology；Relative to power-plant flue gas, NO contains
It measures more, if carrying out denitration process with conventional ozone method of denitration, will lead to that enterprise investment is high, operating cost height, enterprise can not
Receive, and take up a large area, enterprise cannot achieve.In order to solve the problems, such as that existing method of denitration is at high cost, the application is provided
A kind of denitrification apparatus of the molten gold of wet process and/or Rong Yin workshop section flue gas.
In a kind of typical embodiment of the application, it is molten golden and/or Rong Yin workshop section flue gas de- to provide a kind of wet process
Nitre device, as shown in Figure 1, the denitrification apparatus includes the first caustic wash unit 10, oxidizing and denitrating ozone unit 20 and the second alkali cleaning list
Member 30, saline solution exports after the first caustic wash unit 10 is absorbed with smoke inlet, initial wash exhanst gas outlet and first；Ozone oxidation
Denitration unit 20 has exhanst gas outlet, initial wash smoke inlet and initial wash flue gas after initial wash smoke inlet and oxidation
Outlet is connected；Saline solution outlet after second caustic wash unit 30 is absorbed with smoke inlet, flue gas emission mouth and second after oxidation, oxidation
Smoke inlet is connected with exhanst gas outlet after oxidation afterwards.
It is generally higher in view of the content of nitrogen dioxide in the molten gold of wet process and/or Rong Yin workshop section flue gas, therefore first with the
One caustic wash unit 10, which absorb to the nitrogen oxides in flue gas, forms nitrate or nitrite, obtained initial wash flue gas
Nitrogen oxides in nitrogen oxides greatly reduce；Denitration is being carried out to initial wash flue gas using oxidizing and denitrating ozone unit 20
When processing, nitric oxide can more fully carry out haptoreaction with ozone, therefore more efficient low can aoxidize therein one
Nitrogen oxidation is at nitrogen dioxide, and due to the setting of the first caustic wash unit 10 so that the nitric oxide in flue gas reaches reduction,
The operating cost of denitrification apparatus can be reduced in the consumption of this step reduction ozone；It is right followed by the second caustic wash unit 30
Flue gas carries out second of alkali cleaning after oxidation, and the remaining nitrogen oxides after lye and oxidation in flue gas, which absorb, forms nitrate
Or nitrite, and gained saline solution can be used as semi-finished product or after processing as product sell, proceeds of sale into
One step reduces the overall operation cost of denitrification apparatus.And treated that denitration is fully achieved in flue gas by above-mentioned denitrification apparatus
Standard can be realized flue gas emission.
As shown in Figure 1, it is preferred that the first caustic wash unit 10 include the first caustic wash tower 11 and the first lye supply equipment 12, first
Saline solution exports after caustic wash tower 11 is absorbed with the first alkali liquor inlet, smoke inlet, initial wash exhanst gas outlet and first；First alkali
Liquid supply equipment 12 is connected with the first alkali liquor inlet.Using the first lye supply equipment 12 being independently arranged to the first caustic wash tower 11
Water is supplied, ensure that the flexibility that this process lye supply is adjusted.
In addition to further increasing the utilization rate of lye with save the cost, preferably the first caustic wash unit 10 further includes first
Flue gas analyzer 13, smoke inlet are connected to detect the nitrous oxides concentration in flue gas, the first alkali with the first flue gas analyzer 13
Liquid supply equipment 12 is connected with the first flue gas analyzer 13 and adjusts the supply of water according to nitrous oxides concentration.According to the first cigarette
The nitrous oxides concentration that gas analyzer 13 detects adjusts the water of the first lye supply equipment 12 supply in real time, realizes lye to nitrogen
Oxide fully absorbs, and improves the utilization rate of lye and the yield of salt.
Above-mentioned oxidizing and denitrating ozone unit 20 includes oxidizing and denitrating ozone reactor 21 and ozone supplied equipment 22, ozone oxygen
Changing Benitration reactor 21 has ozone inlet and initial wash smoke inlet；Ozone supplied equipment 22 is connected with ozone inlet.It adopts
Ozone is supplied to oxidizing and denitrating ozone reactor 21 with the ozone supplied equipment 22 being independently arranged, ensure that ozone supplied amount is adjusted
Flexibility.In addition to further increasing the utilization rate of ozone, preferably above-mentioned oxidizing and denitrating ozone unit 20 further includes second
Flue gas analyzer 23, smoke inlet are connected to detect the nitric oxide concentration in flue gas with the second flue gas analyzer 23, and ozone supplies
It answers equipment 22 to be connected with the second flue gas analyzer 23 and adjusts the supply of ozone according to nitric oxide concentration.According to the second flue gas
The nitric oxide concentration that analyzer 23 detects adjusts the ozone amount of the supply of ozone supplied equipment 22 in real time, realizes ozone and an oxidation
The abundant reaction of nitrogen improves ozone utilization rate.
In the application another kind preferred embodiment, as shown in Figure 1, above-mentioned second caustic wash unit 30 includes the second alkali cleaning
Tower 31 and the second lye supply equipment 32, the second caustic wash tower 31 have the second alkali liquor inlet, secondary washing smoke inlet, flue gas row
Saline solution exports after putting mouth and absorbing；Second lye supply equipment 32 is connected with alkali entrance.It is supplied using the second lye being independently arranged
It answers equipment 32 to supply lye to the second caustic wash tower 31, ensure that the flexibility that alkali supply is adjusted.
For the utilization rate of lye with save the cost, preferably above-mentioned second caustic wash unit 30 further includes third in order to further increase
Flue gas analyzer 33, smoke inlet is connected with the nitrogen oxides after detection oxidation in flue gas with third flue gas analyzer 33 after oxidation
Concentration, the second lye supply equipment 32 are connected with third flue gas analyzer 33 and adjust the supply of lye according to nitrous oxides concentration
Amount.Adjust the lye of the second lye supply equipment 32 supply in real time according to the nitrous oxides concentration that third flue gas analyzer 33 detects
Amount, realization lye are sufficiently reacted with nitrogen oxides, improve the utilization rate of lye.
In order to improve the value of the first caustic wash unit 10 and the obtained saline solution of the second caustic wash unit 30, preferably above-mentioned denitration
Device further includes evaporator 41 and crystallizer 42, and there is evaporator 41 dilute saline solution entrance and dense saline solution to export, dilute saline solution entrance with
Saline solution outlet is connected after saline solution outlet is absorbed with second after first absorption；There is crystallizer 42 dense saline solution entrance and by-product salt to go out
Mouthful, dense saline solution entrance is connected with the outlet of dense saline solution.Saline solution is carried out at further concentration using evaporator 41 and crystallizer 42
Reason, obtains by-product salt, which runs producer for denitrification apparatus and increase income, reduce denitration as byproduct export trade
The overall operation cost of device.
In another typical embodiment of the application, it is molten golden and/or Rong Yin workshop section flue gas to provide a kind of wet process
Method of denitration, the method for denitration include: to carry out first time washing to flue gas using the first alkaline solution, obtain initial wash flue gas
Saline solution after being absorbed with first；Oxidizing and denitrating ozone processing, flue gas after being aoxidized are carried out to initial wash flue gas；Utilize the second alkali
Property solution flue gas after oxidation is washed, obtain can discharging flue gas and second absorb after saline solution.
It is generally higher in view of the content of nitrogen dioxide in the molten gold of wet process and/or Rong Yin workshop section flue gas, therefore first to flue gas
In nitrogen oxides carry out absorb form nitrate or nitrite, the nitrogen oxygen in the nitrogen oxides of obtained initial wash flue gas
Compound greatly reduces；When carrying out denitration process to initial wash flue gas, nitric oxide can more fully be connect with ozone
Touching reaction, thus can it is more efficient it is low by oxidation of nitric oxide therein at nitrogen dioxide, and since first time alkali cleaning makes cigarette
Nitric oxide in gas reaches reduction, therefore can reduce the consumption of ozone in this step, reduce the operation of denitrification apparatus at
This；Then second of alkali cleaning is carried out to flue gas after oxidation, lye is absorbed with the remaining nitrogen oxides in flue gas after oxidation
Nitrate or nitrite are formed, and gained saline solution can be used as semi-finished product or sell after processing as product, sell
Profit further reduced the overall operation cost of denitrification apparatus.And treated that flue gas is complete by above-mentioned denitrification apparatus
Reach denitration standard entirely, can be realized flue gas emission.
The various flue gases that the above-mentioned method of denitration of the application is suitable for handling the molten gold of wet process and/or Rong Yin workshop section generates, especially
It is suitable for nitric oxide production concentration, the concentration of nitrogen dioxide≤2000mg/Nm3Flue gas, such as be suitable for nitrogen oxidation
Object peak value is 2000mg/Nm3Flue gas, and control treating capacity≤20000Nm of flue gas3When/h, realizes and utilize lower cost
Reach more preferably fume treatment effect.
Preferably, for can common alkalinity from the prior art to the alkaline solution that is washed of washing flue gas twice
It is selected in solution, it is contemplated that control cost, preferably above-mentioned first alkaline solution and the second alkaline solution are each independently
Sodium hydrate aqueous solution, aqueous sodium carbonate and/or ammonium hydroxide.Wherein effect is more prominent when using the mixing of a variety of alkaline solutions
Out.
Further, in order to improve the utilization rate of alkaline solution, flue gas is washed preferably by the first alkaline solution
During, control molar ratio 1:0.9~1.5 of nitrogen oxides in effluent and the first alkaline solution neutral and alkali substance；It is preferred that benefit
During being washed with the second alkaline solution to flue gas after oxidation, nitrogen oxides in effluent and the second alkalinity after control oxidation
Molar ratio 1:0.9~1.5 of solution neutral and alkali substance.
In order to improve the value of the obtained saline solution of caustic wash unit, preferably above-mentioned method of denitration further includes to saline solution after absorption
It is evaporated crystallization treatment and obtains by-product salt.Further concentration is carried out to saline solution, obtains by-product salt, the by-product salt
Class runs producer for denitrification apparatus and increases income, reduce the overall operation cost of denitrification apparatus as byproduct export trade.
Further, in order to improve the utilization rate of ozone, oxidizing and denitrating ozone processing preferably is carried out to initial wash flue gas
During, the nitric oxide production mass ratio in ozone and initial wash flue gas is 1.6~2.5:1.
Below with reference to embodiment and comparative example, the beneficial effect of the application is further illustrated.
Embodiment 1
Denitration is carried out using out of stock device shown in FIG. 1 gold molten to wet process and/or Rong Yin workshop section flue gas, utilizes the first alkalinity
Solution gold molten to wet process and/or Rong Yin workshop section flue gas carry out first time washing, obtain salt after initial wash flue gas and the first absorption
Liquid；Oxidizing and denitrating ozone processing, flue gas after being aoxidized are carried out to initial wash flue gas；Using the second alkaline solution to oxidation after
Flue gas is washed, obtain can discharging flue gas and second absorb after saline solution.Wherein, using online flue gas analyzer real-time detection cigarette
The composition of main nitrogen oxides and temperature are shown in Table 1 in gas, treatment quantity 15000Nm3/h。
Table 1
| Flue gas composition | NO | NO2 | HCl | Temperature/DEG C |
| Concentration (mg/Nm3) | 2000 | 2000 | 713 | 48 |
During being washed using the first alkali washing process equipment gold molten to wet process and/or Rong Yin workshop section flue gas, first
Alkaline solution uses 20% sodium hydrate aqueous solution, and the sprinkle density of sodium hydrate aqueous solution is 9m3/(m2﹒ h) to control wet process
The molar ratio of molten gold and/or Rong Yin workshop section nitrogen oxides in effluent and sodium hydroxide is 1:0.9；Initial wash flue gas is carried out smelly
During the processing of oxygen oxidation and denitration, nitric oxide production weight ratio is 1.8:1 in control ozone and initial wash flue gas；Utilize
During two alkali washing process equipment wash flue gas after oxidation, the second alkaline solution is water-soluble using 15% sodium hydroxide
Liquid, the sprinkle density for controlling sodium hydrate aqueous solution is 7.5m3/(m2﹒ h) with nitrogen oxides in effluent and hydrogen-oxygen after control washing
Change the molar ratio 1:1 of sodium.
Using the composition of the flue gas of online flue gas analyzer real-time detection detection discharge, testing result is shown in Table 2.
Table 2
| Flue gas | NO | NO2 | HCl | Temperature/DEG C |
| Concentration (mg/Nm3) | 42 | 65 | 46 | 47 |
Embodiment 2
Difference from example 1 is that during carrying out oxidizing and denitrating ozone processing to initial wash flue gas, control
Nitric oxide production weight ratio is 1.6:1 in ozone processed and initial wash flue gas.
Using the composition of the flue gas of online flue gas analyzer real-time detection detection discharge, testing result is shown in Table 3.
Table 3
Embodiment 3
Difference from example 1 is that during carrying out oxidizing and denitrating ozone processing to initial wash flue gas, control
Nitric oxide production weight ratio is 2.5:1 in ozone processed and initial wash flue gas.
Using the composition of the flue gas of online flue gas analyzer real-time detection detection discharge, testing result is shown in Table 4.
Table 4
| Flue gas | NO | NO2 | HCl | Temperature/DEG C |
| Concentration (mg/Nm3) | 21 | 32 | 30 | 47 |
Embodiment 4
Difference from Example 1 is, utilizes the first alkali washing process equipment gold molten to wet process and/or Rong Yin workshop section flue gas
During being washed, the first alkaline solution uses 20% sodium hydrate aqueous solution, the sprinkle density of sodium hydrate aqueous solution
For 3m3/(m2﹒ h) to control the molar ratio of the molten gold of wet process and/or Rong Yin workshop section nitrogen oxides in effluent and sodium hydroxide as 1:
0.3。
Using the composition of the flue gas of online flue gas analyzer real-time detection detection discharge, testing result is shown in Table 5.
Table 5
| Flue gas | NO | NO2 | HCl | Temperature/DEG C |
| Concentration (mg/Nm3) | 51 | 74 | 56 | 47 |
Embodiment 5
Difference from Example 1 is, utilizes the first alkali washing process equipment gold molten to wet process and/or Rong Yin workshop section flue gas
During being washed, the first alkaline solution uses 20% sodium hydrate aqueous solution, the sprinkle density of sodium hydrate aqueous solution
For 10m3/(m2﹒ h) to control the molar ratio of the molten gold of wet process and/or Rong Yin workshop section nitrogen oxides in effluent and sodium hydroxide as 1:1.
Using the composition of the flue gas of online flue gas analyzer real-time detection detection discharge, testing result is shown in Table 6.
Table 6
| Flue gas | NO | NO2 | HCl | Temperature/DEG C |
| Concentration (mg/Nm3) | 24 | 35 | 34 | 47 |
Embodiment 6
Difference from Example 1 is, the process washed using the second alkali washing process equipment to flue gas after oxidation
In, the second alkaline solution uses 15% sodium hydrate aqueous solution, and the sprinkle density for controlling sodium hydrate aqueous solution is 3m3/(m2﹒ h)
It is 1:0.4 with the molar ratio of nitrogen oxides in effluent and sodium hydroxide after control washing.
Using the composition of the flue gas of online flue gas analyzer real-time detection detection discharge, testing result is shown in Table 7.
Table 7
| Flue gas | NO | NO2 | HCl | Temperature/DEG C |
| Concentration (mg/Nm3) | 62 | 91 | 61 | 47 |
Embodiment 7
Difference from Example 1 is, the process washed using the second alkali washing process equipment to flue gas after oxidation
In, the second alkaline solution uses 15% sodium hydrate aqueous solution, and the sprinkle density for controlling sodium hydrate aqueous solution is 10m3/(m2﹒
It h) is 1:1.4 with the molar ratio of nitrogen oxides in effluent and sodium hydroxide after control washing.
Using the composition of the flue gas of online flue gas analyzer real-time detection detection discharge, testing result is shown in Table 8.
Table 8
| Flue gas | NO | NO2 | HCl | Temperature/DEG C |
| Concentration (mg/Nm3) | 26 | 41 | 29 | 47 |
Embodiment 8
Difference from Example 1 is, treatment quantity 20000Nm3/h。
Using the composition of the flue gas of online flue gas analyzer real-time detection detection discharge, testing result is shown in Table 9.
Table 9
| Flue gas | NO | NO2 | HCl | Temperature/DEG C |
| Concentration (mg/Nm3) | 63 | 82 | 69 | 47 |
Embodiment 9
Difference from Example 1 is, treatment quantity 25000Nm3/h。
Using the composition of the flue gas of online flue gas analyzer real-time detection detection discharge, testing result is shown in Table 10.
Table 10
| Flue gas | NO | NO2 | HCl | Temperature/DEG C |
| Concentration (mg/Nm3) | 81 | 116 | 120 | 47 |
Embodiment 10
Difference from example 1 is that utilizing the first alkali washing process equipment gold molten to wet process and/or Rong Yin workshop section cigarette
During gas is washed, the first alkaline solution uses 20% sodium hydrate aqueous solution, and the spray of sodium hydrate aqueous solution is close
Degree is 2m3/(m2﹒ h) to control the molar ratio of the molten gold of wet process and/or Rong Yin workshop section nitrogen oxides in effluent and sodium hydroxide as 1:
0.2；During carrying out oxidizing and denitrating ozone processing to initial wash flue gas, an oxidation in control ozone and initial wash flue gas
The weight ratio of nitrogen is 1.8:1；During being washed using the second alkali washing process equipment to flue gas after oxidation, the second alkalinity is molten
Liquid uses 15% sodium hydrate aqueous solution, and the sprinkle density for controlling sodium hydrate aqueous solution is 12m3/(m2﹒ h) with control washing after
The molar ratio 1:1.6 of nitrogen oxides in effluent and sodium hydroxide.
Using the composition of the flue gas of online flue gas analyzer real-time detection detection discharge, testing result is shown in Table 11.
Table 11
| Flue gas | NO | NO2 | HCl | Temperature/DEG C |
| Concentration (mg/Nm3) | 44 | 69 | 48 | 47 |
Embodiment 11
Difference from Example 1 is, using nitrogen oxides main in online flue gas analyzer real-time detection flue gas
Composition and temperature are shown in Table 12, treatment quantity 15000Nm3/h。
Table 12
| Flue gas composition | NO | NO2 | HCl | Temperature/DEG C |
| Concentration (mg/Nm3) | 1500 | 1600 | 684 | 48 |
Using the composition of the flue gas of online flue gas analyzer real-time detection detection discharge, testing result is shown in Table 13.
Table 13
| Flue gas | NO | NO2 | HCl | Temperature/DEG C |
| Concentration (mg/Nm3) | 29 | 36 | 42 | 48 |
It can be seen from the above description that the above embodiments of the utility model achieve the following technical effects:
It is generally higher in view of the content of nitrogen dioxide in the molten gold of wet process and/or Rong Yin workshop section flue gas, therefore first with the
One caustic wash unit, which absorb to the nitrogen oxides in flue gas, forms nitrate or nitrite, obtained initial wash flue gas
Nitrogen oxides in nitrogen oxides greatly reduces；Denitration process is being carried out to initial wash flue gas using oxidizing and denitrating ozone unit
When, nitric oxide more fully can carry out haptoreaction with ozone, therefore can be more efficient low by nitric oxide oxygen therein
It is melted into nitrogen dioxide, and due to the setting of the first caustic wash unit so that the nitric oxide in flue gas reaches reduction, it can be
This step reduces the consumption of ozone, reduces the operating cost of denitrification apparatus；Followed by the second caustic wash unit to cigarette after oxidation
Gas carries out second of alkali cleaning, and the remaining nitrogen oxides after lye and oxidation in flue gas, which absorb, forms nitrate or nitrous acid
Salt, and gained saline solution can be used as semi-finished product or sell after processing as product, and proceeds of sale further decrease
The overall operation cost of denitrification apparatus.And treated that denitration standard, energy is fully achieved in flue gas by above-mentioned denitrification apparatus
Enough realize flue gas emission.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (8)
1. the denitrification apparatus of a kind of molten gold of wet process and/or Rong Yin workshop section flue gas, which is characterized in that the denitrification apparatus includes:
First caustic wash unit (10), saline solution exports after absorbing with smoke inlet, initial wash exhanst gas outlet and first；
Oxidizing and denitrating ozone unit (20) has exhanst gas outlet after initial wash smoke inlet and oxidation, the initial wash cigarette
Gas entrance is connected with the initial wash exhanst gas outlet；And
Second caustic wash unit (30), saline solution outlet after being absorbed with smoke inlet, flue gas emission mouth and second after oxidation, the oxygen
Smoke inlet is connected with exhanst gas outlet after the oxidation after change.
2. denitrification apparatus according to claim 1, which is characterized in that first caustic wash unit (10) includes:
First caustic wash tower (11) has the first alkali liquor inlet, the smoke inlet, the initial wash exhanst gas outlet and described the
Saline solution exports after one absorption；
First lye supply equipment (12), is connected with first alkali liquor inlet.
3. denitrification apparatus according to claim 2, which is characterized in that first caustic wash unit (10) further includes the first cigarette
Gas analyzer (13), the smoke inlet are connected dense to detect the nitrogen oxides in flue gas with first flue gas analyzer (13)
Degree, the first lye supply equipment (12) are connected and with first flue gas analyzer (13) according to the nitrous oxides concentration
Adjust the supply of water.
4. denitrification apparatus according to claim 1, which is characterized in that the oxidizing and denitrating ozone unit (20) includes:
Oxidizing and denitrating ozone reactor (21) has ozone inlet and the initial wash smoke inlet；
Ozone supplied equipment (22), is connected with the ozone inlet.
5. denitrification apparatus according to claim 4, which is characterized in that the oxidizing and denitrating ozone unit (20) further includes
Two flue gas analyzers (23), the initial wash smoke inlet are connected to detect and wash for the first time with second flue gas analyzer (23)
The nitric oxide concentration in flue gas is washed, the ozone supplied equipment (22) is connected with second flue gas analyzer (23) and basis
The nitric oxide concentration adjusts the supply of the ozone.
6. denitrification apparatus according to claim 1, which is characterized in that second caustic wash unit (30) includes:
Second caustic wash tower (31) has the second alkali liquor inlet, smoke inlet after the oxidation, the flue gas emission mouth and described the
Saline solution exports after two absorptions；
Second lye supply equipment (32), is connected with the alkali liquor inlet.
7. denitrification apparatus according to claim 6, which is characterized in that second caustic wash unit (30) further includes third cigarette
Gas analyzer (33), smoke inlet is connected to detect after oxidation in flue gas with the third flue gas analyzer (33) after the oxidation
Nitrous oxides concentration, the second lye supply equipment (32) is connected and with the third flue gas analyzer (33) according to described
The supply of nitrous oxides concentration adjustment lye.
8. denitrification apparatus according to claim 1, which is characterized in that the denitrification apparatus further include:
There is evaporator (41) dilute saline solution entrance and dense saline solution to export, saline solution after dilute saline solution entrance and first absorption
Saline solution outlet is connected after outlet is absorbed with described second；
There is crystallizer (42) dense saline solution entrance and by-product salt to export, and the dense saline solution entrance exports phase with the dense saline solution
Even.
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| CN108579370A (en) * | 2018-05-02 | 2018-09-28 | 中国恩菲工程技术有限公司 | The denitrification apparatus and method of denitration of the molten gold of wet method and/or Rong Yin workshop sections flue gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108579370A (en) * | 2018-05-02 | 2018-09-28 | 中国恩菲工程技术有限公司 | The denitrification apparatus and method of denitration of the molten gold of wet method and/or Rong Yin workshop sections flue gas |
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