CN208626981U - 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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- CN208626981U CN208626981U CN201820649015.4U CN201820649015U CN208626981U CN 208626981 U CN208626981 U CN 208626981U CN 201820649015 U CN201820649015 U CN 201820649015U CN 208626981 U CN208626981 U CN 208626981U
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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: oxidizing and denitrating ozone unit, has exhanst gas outlet after smoke inlet and oxidation；Wash unit, it is exported with exhanst gas outlet after smoke inlet, washing after oxidation and pickle, smoke inlet is connected with exhanst gas outlet after oxidation after oxidation, and pickle outlet is connected to the molten gold of wet process with the molten gold of wet process and/or Rong Yin workshop section and/or Rong Yin workshop section provides part acid solution；And caustic wash unit, saline solution exports after having smoke inlet after washing, flue gas emission mouth and absorbing, and smoke inlet is connected with exhanst gas outlet after washing after washing.The higher nitrogen oxides in flue gas after oxidation absorb by washing unit and form pickle, pickle returns to the molten gold of wet process and/or Rong Yin workshop section has saved the cost of molten gold and/or molten silver, reduces overall operation cost；Meanwhile operating cost further reduced by caustic wash unit formation nitrate or nitrite.
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 was high,
With the growth in reaction time, NO2Concentration gradually decreases, and NO concentration gradually increases, and is finally maintained essentially at NO2/ NO concentration ratio
It is 1/1.Since the molten gold of precious metal smelting, Rong Yin workshop section nitrogen oxides in effluent content are higher, if with conventional ozone method of denitration
Denitration process is carried out, will lead to enterprise investment height, operating cost height, enterprise can not receive, and take up a large area, and enterprise can not be real
It is existing.
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 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: oxidizing and denitrating ozone unit, and there is flue gas after smoke inlet and oxidation to go out
Mouthful；Unit is washed, with exhanst gas outlet after smoke inlet, washing after oxidation and pickle outlet, smoke inlet and oxygen after oxidation
Exhanst gas outlet is connected after change, and pickle outlet is connected to the molten gold of wet process and/or Rong Yin workshop section with the molten gold of wet process and/or Rong Yin workshop section
Part acid solution is provided；And caustic wash unit, saline solution exports after having smoke inlet after washing, flue gas emission mouth and absorbing, washing
Smoke inlet is connected with exhanst gas outlet after washing afterwards.
Further, the molten gold of above-mentioned wet process and/or Rong Yin workshop section include acid solution configurator, and acid solution configurator has concentrated nitric acid
Entrance and pickle entrance, pickle entrance are connected with pickle outlet.
Further, above-mentioned oxidizing and denitrating ozone unit includes: oxidizing and denitrating ozone reactor, has ozone inlet and cigarette
Gas entrance, smoke inlet are connected with the exhanst gas outlet of the molten gold of wet process and/or Rong Yin workshop section；Ozone supplied equipment, with ozone inlet
It is connected.
Further, above-mentioned oxidizing and denitrating ozone unit further includes the first flue gas analyzer, smoke inlet and the first flue gas
Analyzer is connected to detect the nitric oxide concentration in flue gas, and ozone supplied equipment is connected with the first flue gas analyzer and according to one
The supply of nitric oxide concentration adjustment ozone.
Further, above-mentioned washing unit includes: water scrubber, with flue gas after smoke inlet, washing after water inlet, oxidation
Outlet and pickle outlet；Water supply equipment, is connected with water inlet.
Further, above-mentioned washing unit further includes the second flue gas analyzer, smoke inlet and the second flue gas point after oxidation
Analyzer is connected with the nitrous oxides concentration after detection oxidation in flue gas, and water supply equipment is connected with the second flue gas analyzer and basis
The supply of nitrous oxides concentration adjustment water.
Further, above-mentioned caustic wash unit includes: caustic wash tower, has smoke inlet, flue gas emission mouth after alkali entrance, washing
It is exported with saline solution after absorption；Alkali supply equipment is connected with alkali entrance.
Further, above-mentioned caustic wash unit further includes third flue gas analyzer, smoke inlet and third flue gas point after washing
Analyzer is connected with the nitrous oxides concentration after detection washing in flue gas, and alkali supply equipment is connected with third flue gas analyzer and basis
The supply of nitrous oxides concentration adjustment alkali.
Further, above-mentioned denitrification apparatus further include: evaporator there is dilute saline solution entrance and dense saline solution to export, dilute saline solution
Entrance is connected with saline solution outlet after absorption；Crystallizer there is dense saline solution entrance and by-product salt to export, dense saline solution entrance and dense salt
Liquid outlet is connected.
Using the technical solution of the utility model, using oxidizing and denitrating ozone unit gold molten to wet process and/or Rong Yin workshop section
Flue gas carries out denitration process at a lower temperature, and nitric oxide therein is oxidized to form nitrogen dioxide, nitrogen trioxide, five oxygen
Change the higher nitrogen oxides such as phenodiazine, this process higher may cause ozone consumption to increase and then lead due to nitric oxide concentration
Cause increased costs；In order to reduce the operating cost of the denitrification apparatus, further by washing unit to the height in flue gas after oxidation
Valence nitrogen oxides is absorbed, and the pickle based on dust technology is formed, and it is molten golden and/or molten which is returned to wet process
Silver-colored workshop section uses as the acid solution of molten gold and/or molten silver, has saved the cost of molten gold and/or molten silver, to reduce denitration dress
The overall operation cost set；Meanwhile alkali cleaning carried out to flue gas after washing, the remaining nitrogen oxides after alkali and washing 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, oxidizing and denitrating ozone unit；11, oxidizing and denitrating ozone reactor；12, ozone supplied equipment；13, the first flue gas
Analyzer；
20, unit is washed；21, water scrubber；22, water supply equipment；23, the second flue gas analyzer；
30, caustic wash unit；31, caustic wash tower；32, alkali 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 oxidizing and denitrating ozone unit 10, washing unit 20 and caustic wash unit 30, ozone
Oxidation and denitration unit 10 has exhanst gas outlet after smoke inlet and oxidation；Washing unit 20 has smoke inlet, washing after oxidation
Exhanst gas outlet and pickle outlet afterwards, smoke inlet is connected with exhanst gas outlet after oxidation after oxidation, and pickle outlet is molten with wet process
Gold and/or Rong Yin workshop section are connected to the molten gold of wet process and/or Rong Yin workshop section provides part acid solution；Caustic wash unit 30 has cigarette after washing
Saline solution exports after gas entrance, flue gas emission mouth and absorption, and smoke inlet is connected with exhanst gas outlet after washing after washing.
Denitration is carried out using the gold molten to wet process of oxidizing and denitrating ozone unit 10 and/or Rong Yin workshop section flue gas at a lower temperature
Processing, nitric oxide therein are oxidized to form the higher nitrogen oxides such as nitrogen dioxide, nitrogen trioxide, dinitrogen pentoxide, this
Process is since nitric oxide concentration higher may cause ozone consumption to increase and then lead to increased costs；It is de- in order to reduce this
The operating cost of nitre device is further absorbed by the higher nitrogen oxides in flue gas after 20 pairs of unit oxidations of washing, shape
At the pickle based on dust technology, which is returned into the molten gold of wet process and/or Rong Yin workshop section as molten golden and/or molten
The acid solution of silver uses, and the cost of molten gold and/or molten silver has been saved, to reduce the overall operation cost of denitrification apparatus；Meanwhile
Alkali cleaning is carried out to flue gas after washing, the remaining nitrogen oxides after alkali and washing in flue gas, which absorb, forms nitrate or nitrous
Hydrochlorate, and gained saline solution can be used as semi-finished product or sell after processing as product, and proceeds of sale further drop
The low overall operation cost of denitrification apparatus.And by above-mentioned denitrification apparatus, treated that denitration standard is fully achieved in flue gas,
It can be realized flue gas emission.
In order to guarantee wet process it is molten gold and/or Rong Yin workshop section efficient progress, preferably as shown in Figure 1, above-mentioned wet process it is molten gold and/
Or Rong Yin workshop section includes acid solution configurator 01, acid solution configurator 01 has concentrated nitric acid entrance and pickle entrance, pickle entrance
It is connected with pickle outlet.The washing obtained diluted acid of unit 20 is subjected to mixing preparation with concentrated nitric acid and is obtained satisfactory
Nitric acid solution concentration ensure that the concentration requirement of the molten gold of wet process and/or molten silver for nitric acid solution, and then guarantee the height of the workshop section
Effect carries out.
As shown in Figure 1, it is preferred that above-mentioned oxidizing and denitrating ozone unit 10 includes that oxidizing and denitrating ozone reactor 11 and ozone supply
Equipment 12 is answered, oxidizing and denitrating ozone reactor 11 has ozone inlet and smoke inlet, and smoke inlet is molten golden and/or molten with wet process
The exhanst gas outlet of silver-colored workshop section is connected；Ozone supplied equipment 12 is connected with ozone inlet.Using the ozone supplied equipment being independently arranged
12 pairs of oxidizing and denitrating ozone reactors 11 supply ozone, ensure that the flexibility that ozone supplied amount is adjusted.In addition to further
Increase the utilization rate of ozone, preferably above-mentioned oxidizing and denitrating ozone unit 10 further includes the first flue gas analyzer 13, smoke inlet with
First flue gas analyzer 13 is connected to detect the nitric oxide concentration in flue gas, ozone supplied equipment 12 and the first flue gas analyzer
13 are connected and adjust according to nitric oxide concentration the supply of ozone.The nitric oxide detected according to the first flue gas analyzer 13 is dense
Degree adjusts the ozone amount that ozone supplied equipment 12 is supplied in real time, realizes ozone and nitric oxide production abundant reaction, improves ozone benefit
With rate.
In a preferred embodiment of the present application, as shown in Figure 1, above-mentioned washing unit 20 includes that water scrubber 21 and water supply
Equipment 22 is answered, water scrubber 21 is with exhanst gas outlet after smoke inlet, washing after water inlet, oxidation and pickle outlet；Water supply
Equipment 22 is connected with water inlet.Water is supplied to water scrubber 21 using the water supply equipment 22 being independently arranged, ensure that water supply
The flexibility of adjusting.
In addition to further increasing the utilization rate of water with save the cost, preferably washing unit 20 further includes the second flue gas point
Analyzer 23, smoke inlet is connected to detect the nitrous oxides concentration in flue gas, water supply with the second flue gas analyzer 23 after oxidation
Equipment 22 is connected with the second flue gas analyzer 23 and adjusts the supply of water according to nitrous oxides concentration.According to the second flue gas analysis
The nitrous oxides concentration that instrument 23 detects adjusts the water of the supply of water supply equipment 22 in real time, realizes that water fills higher nitrogen oxides
Divide and absorb, improves the utilization rate of water.
In the application another kind preferred embodiment, as shown in Figure 1, above-mentioned caustic wash unit 30 includes caustic wash tower 31 and alkali
Supply equipment 32, with smoke inlet, flue gas emission mouth after alkali entrance, washing and after absorbing, saline solution exports caustic wash tower 31；Alkali supplies
Equipment 32 is answered to be connected with alkali entrance.Water is supplied to water scrubber 21 using the alkali supply equipment 32 being independently arranged, ensure that alkali is supplied
Measure the flexibility adjusted.
For the utilization rate of alkali with save the cost, preferably above-mentioned caustic wash unit 30 further includes third flue gas point in order to further increase
Analyzer 33, smoke inlet are connected with the nitrous oxides concentration after detection washing in flue gas, alkali supply with third flue gas analyzer 33
Equipment 32 is connected with third flue gas analyzer 33 and adjusts the supply of alkali according to nitrous oxides concentration.According to third flue gas analysis
The nitrous oxides concentration that instrument 33 detects adjusts the alkali number of the supply of alkali supply equipment 32 in real time, realizes the abundant anti-of alkali and nitrogen dioxide
It answers, improves the utilization rate of alkali.
In order to improve the value of the obtained saline solution of caustic wash unit 30, preferably above-mentioned denitrification apparatus further includes 41 He of evaporator
There is dilute saline solution entrance and dense saline solution to export for crystallizer 42, evaporator 41, and dilute saline solution entrance is connected with saline solution outlet after absorption；Knot
There is brilliant device 42 dense saline solution entrance and by-product salt to export, and dense saline solution entrance is connected with the outlet of dense saline solution.Utilize 41 He of evaporator
Crystallizer 42 carries out further concentration to saline solution, obtains by-product salt, which, as byproduct export trade, is de-
Nitre device runs producer and increases income, reduces the overall operation cost of denitrification apparatus.
In order to better use above-mentioned denitrification apparatus, in another typical embodiment of the application, one kind is provided
The method of denitration of the molten gold of wet process and/or Rong Yin workshop section flue gas, the method for denitration include: to carry out at oxidizing and denitrating ozone to flue gas
Reason, flue gas after being aoxidized；Flue gas after oxidation is washed using water, flue gas and pickle after being washed；Utilize alkalinity
Solution washs flue gas after washing, obtains saline solution after can discharging flue gas and absorbing；And it is pickle reuse is molten to wet process
Gold and/or Rong Yin workshop section.
Gold molten to wet process and/or Rong Yin workshop section flue gas carry out denitration process, and nitric oxide therein is oxidized to form dioxy
Change higher nitrogen oxides, this process such as nitrogen, nitrogen trioxide, dinitrogen pentoxide higher may be caused due to nitric oxide concentration
Ozone consumption increases and then causes increased costs；In order to reduce the operating cost of the method for denitration, further to cigarette after oxidation
Higher nitrogen oxides in gas are absorbed, and the pickle based on dust technology is formed, and it is molten which is returned to wet process
Gold and/or Rong Yin workshop section use as the acid solution of molten gold and/or molten silver, the cost of molten gold and/or molten silver have been saved, to reduce
The overall operation cost of method of denitration；Meanwhile alkali cleaning is carried out to flue gas after washing, the remaining nitrogen after alkali and washing in flue gas
Oxide, which absorb, forms nitrate or nitrite, and gained saline solution can be used as semi-finished product or after processing conduct
Product is sold, and proceeds of sale further reduced the overall operation cost of method of denitration.And pass through above-mentioned method of denitration
Treated, and denitration standard is fully achieved in flue gas, 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 equal < 1000mg/Nm of the concentration of nitrogen dioxide3Flue gas and flue gas treating capacity <
10000Nm3The case where/h, is realized and reaches more preferably fume treatment effect using lower cost.
Preferably, the alkaline solution for being washed to flue gas after washing can be common alkaline molten from the prior art
Selected in liquid, it is contemplated that control cost, preferably above-mentioned alkaline solution be 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.
Further, in order to improve the utilization rate of alkaline solution, flue gas after washing is washed preferably by alkaline solution
During washing, molar ratio 1:0.9~1.5 of nitrogen oxides in effluent and alkaline solution neutral and alkali substance after control washing.
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, during preferably carrying out oxidizing and denitrating ozone processing to flue gas,
Controlling nitric oxide production weight ratio in ozone and flue gas is 1.6~2.5:1.
In order to improve the utilization rate of water, during washing preferably by water to flue gas after oxidation, the spray of water is close
Degree is 2.5~8m3/(m2﹒ h).
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, i.e., to the molten gold of wet process
And/or Rong Yin workshop section flue gas carries out oxidizing and denitrating ozone processing, flue gas after being aoxidized；Flue gas after oxidation is washed using water
It washs, flue gas and pickle after being washed；Flue gas after washing is washed using alkaline solution, obtains that flue gas and suction can be discharged
Saline solution after receipts；And by pickle reuse to the wet process it is molten gold and/or Rong Yin workshop section.Wherein, using online flue gas analyzer
The composition of main nitrogen oxides and temperature are shown in Table 1 in real-time detection flue gas, treatment quantity 5500Nm3/h。
Table 1
| Flue gas composition | NO | NO2 | HCl | Temperature/DEG C |
| Concentration (mg/Nm3) | 620 | 833 | 436 | 45 |
During carrying out oxidizing and denitrating ozone processing to flue gas, controlling ozone with weight ratio nitric oxide production in flue gas is
2:1；During being washed using water to flue gas after oxidation, the sprinkle density for controlling water is 5m3/(m2﹒ h), it is molten using alkalinity
When liquid washs flue gas after washing, alkaline solution uses 20% sodium hydrate aqueous solution, and passes through control alkaline solution
The molar ratio 1:1.2 of nitrogen oxides in effluent and sodium hydroxide after spray rate control washing.
Using the composition of the flue gas of online flue gas analyzer real-time detection discharge, testing result is shown in Table 2.
Table 2
Embodiment 2
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, wherein in flue gas
The composition and temperature of main nitrogen oxides are shown in Table 3, treatment quantity 3200Nm3/h。
Table 3
| Flue gas composition | NO | NO2 | HCl | Temperature/DEG C |
| Concentration (mg/Nm3) | 625 | 830 | 432 | 45 |
During carrying out oxidizing and denitrating ozone processing to flue gas, controlling ozone with weight ratio nitric oxide production in flue gas is
1.6:1；During being washed using water to flue gas after oxidation, the sprinkle density for controlling water is 8m3/(m2﹒ h), utilize alkalinity
When solution washs flue gas after washing, alkaline solution uses 20% sodium hydrate aqueous solution, and passes through control alkaline solution
Spray rate control washing after nitrogen oxides in effluent and sodium hydroxide molar ratio 1:0.9.
The composition of the flue gas of discharge is detected, testing result is shown in Table 4.
Table 4
| Flue gas | NO | NO2 | HCl | Temperature/DEG C |
| Concentration (mg/Nm3) | 2 | 60 | 8 | 44 |
Embodiment 3
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, wherein in flue gas
The composition and temperature of main nitrogen oxides are shown in Table 5, treatment quantity 8650Nm3/h。
Table 5
| Flue gas composition | NO | NO2 | HCl | Temperature/DEG C |
| Concentration (mg/Nm3) | 710 | 768 | 414 | 45 |
During carrying out oxidizing and denitrating ozone processing to flue gas, controlling ozone with weight ratio nitric oxide production in flue gas is
2.5:1；During being washed using water to flue gas after oxidation, the sprinkle density for controlling water is 2.5m3/(m2﹒ h), utilize alkali
Property solution when being washed to flue gas after washing, alkaline solution uses 20% sodium hydrate aqueous solution, and molten by control alkalinity
The molar ratio 1:1.5 of nitrogen oxides in effluent and sodium hydroxide after the spray rate control washing of liquid.
The composition of the flue gas of discharge is detected, testing result is shown in Table 6.
Table 6
| Flue gas | NO | NO2 | HCl | Temperature/DEG C |
| Concentration (mg/Nm3) | 1 | 59 | 11 | 44 |
Embodiment 4
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, wherein in flue gas
The composition and temperature of main nitrogen oxides are shown in Table 7, treatment quantity 4800Nm3/h。
Table 7
| Flue gas composition | NO | NO2 | HCl | Temperature/DEG C |
| Concentration (mg/Nm3) | 990 | 930 | 518 | 45 |
During carrying out oxidizing and denitrating ozone processing to flue gas, controlling ozone with weight ratio nitric oxide production in flue gas is
1.8:1；During being washed using water to flue gas after oxidation, the sprinkle density for controlling water is 6m3/(m2﹒ h), utilize alkalinity
When solution washs flue gas after washing, alkaline solution uses 20% sodium hydrate aqueous solution, and passes through control alkaline solution
Spray rate control washing after nitrogen oxides in effluent and sodium hydroxide molar ratio 1:1.2.
The composition of the flue gas of discharge is detected, testing result is shown in Table 8.
Table 8
| Flue gas | NO | NO2 | HCl | Temperature/DEG C |
| Concentration (mg/Nm3) | 5 | 57 | 13 | 44 |
Embodiment 5
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, wherein in flue gas
The composition and temperature of main nitrogen oxides are shown in Table 9, treatment quantity 11800Nm3/h。
Table 9
| Flue gas composition | NO | NO2 | HCl | Temperature/DEG C |
| Concentration (mg/Nm3) | 990 | 930 | 518 | 45 |
During carrying out oxidizing and denitrating ozone processing to flue gas, controlling ozone with weight ratio nitric oxide production in flue gas is
1.8:1；During being washed using water to flue gas after oxidation, the sprinkle density for controlling water is 6m3/(m2﹒ h), utilize alkalinity
When solution washs flue gas after washing, alkaline solution uses 20% sodium hydrate aqueous solution, and passes through control alkaline solution
Spray rate control washing after nitrogen oxides in effluent and sodium hydroxide molar ratio 1:1.2.
The composition of the flue gas of discharge is detected, testing result is shown in Table 10.
Table 10
| Flue gas | NO | NO2 | HCl | Temperature/DEG C |
| Concentration (mg/Nm3) | 59 | 94 | 37 | 44 |
It can be seen from the above description that the above embodiments of the utility model achieve the following technical effects:
It is carried out at denitration at a lower temperature using oxidizing and denitrating ozone unit gold molten to wet process and/or Rong Yin workshop section flue gas
Reason, nitric oxide therein are oxidized to form the higher nitrogen oxides such as nitrogen dioxide, nitrogen trioxide, dinitrogen pentoxide, this mistake
Journey is since nitric oxide concentration higher may cause ozone consumption to increase and then lead to increased costs；In order to reduce the denitration
The operating cost of device, further by wash unit the higher nitrogen oxides in flue gas after oxidation are absorbed, formed with
The part pickle is returned to the molten gold of wet process and/or Rong Yin workshop section as molten golden and/or molten silver by the pickle based on dust technology
Acid solution uses, and the cost of molten gold and/or molten silver has been saved, to reduce the overall operation cost of denitrification apparatus；Meanwhile to washing
It washs rear flue gas and carries out alkali cleaning, the remaining nitrogen oxides after alkali and washing 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 (9)
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:
Oxidizing and denitrating ozone unit (10) has exhanst gas outlet after smoke inlet and oxidation；
It washes unit (20), with exhanst gas outlet after smoke inlet, washing after oxidation and pickle outlet, flue gas after the oxidation
Entrance is connected with exhanst gas outlet after the oxidation, and the pickle outlet is connected to described with the molten gold of wet process and/or Rong Yin workshop section
The molten gold of wet process and/or Rong Yin workshop section provide part acid solution；And
Caustic wash unit (30), saline solution exports after having smoke inlet after washing, flue gas emission mouth and absorbing, flue gas after the washing
Entrance is connected with exhanst gas outlet after the washing.
2. denitrification apparatus according to claim 1, which is characterized in that the molten golden and/or Rong Yin workshop section of the wet process includes acid
Liquid configurator (01), the acid solution configurator (01) have concentrated nitric acid entrance and pickle entrance, the pickle entrance and institute
Pickle outlet is stated to be connected.
3. denitrification apparatus according to claim 1, which is characterized in that the oxidizing and denitrating ozone unit (10) includes:
Oxidizing and denitrating ozone reactor (11) has ozone inlet and the smoke inlet, the smoke inlet and the wet process
Molten gold and/or the exhanst gas outlet of Rong Yin workshop section are connected；
Ozone supplied equipment (12), is connected with the ozone inlet.
4. denitrification apparatus according to claim 3, which is characterized in that the oxidizing and denitrating ozone unit (10) further includes
One flue gas analyzer (13), the smoke inlet are connected to detect the oxidation in the flue gas with the first flue gas analyzer
Nitrogen concentration, the ozone supplied equipment (12) are connected and with first flue gas analyzer (13) according to the nitric oxide concentration
Adjust the supply of the ozone.
5. denitrification apparatus according to claim 1, which is characterized in that the washing unit (20) includes:
Water scrubber (21) goes out with exhanst gas outlet after smoke inlet, the washing after water inlet, the oxidation and the pickle
Mouthful；
Water supply equipment (22), is connected with the water inlet.
6. denitrification apparatus according to claim 5, which is characterized in that the washing unit (20) further includes the second flue gas point
Analyzer (23), smoke inlet is connected with the nitrogen after detection oxidation in flue gas with second flue gas analyzer (23) after the oxidation
Oxide concentration, the water supply equipment (22) are connected and dense according to the nitrogen oxides with second flue gas analyzer (23)
The supply of degree adjustment water.
7. denitrification apparatus according to claim 1, which is characterized in that the caustic wash unit (30) includes:
Caustic wash tower (31) goes out with saline solution after smoke inlet, the flue gas emission mouth and the absorption after alkali entrance, the washing
Mouthful；
Alkali supply equipment (32) is connected with the alkali entrance.
8. denitrification apparatus according to claim 7, which is characterized in that the caustic wash unit (30) further includes third flue gas point
Analyzer (33), smoke inlet is connected with the nitrogen after detection washing in flue gas with the third flue gas analyzer (33) after the washing
Oxide concentration, the alkali supply equipment (32) are connected and dense according to the nitrogen oxides with the third flue gas analyzer (33)
The supply of degree adjustment alkali.
9. 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, and saline solution exports after dilute saline solution entrance and the absorption
It is connected；
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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108465359A (en) * | 2018-05-02 | 2018-08-31 | 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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2018
- 2018-05-02 CN CN201820649015.4U patent/CN208626981U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108465359A (en) * | 2018-05-02 | 2018-08-31 | 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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