CN111359681A - Method and device for regenerating ion exchange material for desulfurization and denitrification by ion exchange method - Google Patents

Method and device for regenerating ion exchange material for desulfurization and denitrification by ion exchange method Download PDF

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CN111359681A
CN111359681A CN202010208167.2A CN202010208167A CN111359681A CN 111359681 A CN111359681 A CN 111359681A CN 202010208167 A CN202010208167 A CN 202010208167A CN 111359681 A CN111359681 A CN 111359681A
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ion exchange
exchange material
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desulfurization
liquid
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樊振江
史磊
吕爱业
李龙博
范瑞华
冯世业
丁光伟
席海生
李胜昔
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Shenzhen Qianhai Zhongsheng Environmental Protection Technology Co ltd
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    • B01J49/00—Regeneration or reactivation of ion-exchangers; Apparatus therefor
    • B01J49/50—Regeneration or reactivation of ion-exchangers; Apparatus therefor characterised by the regeneration reagents
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Abstract

The invention provides a method and a device for regenerating ion exchange materials for desulfurization and denitrification by an ion exchange method, wherein the method for regenerating the ion exchange materials for desulfurization and denitrification by the ion exchange method comprises the following steps: enabling a regenerant to pass through the ion exchange material according to a certain space flow rate to regenerate the ion exchange material; the liquid after the ion exchange material is regenerated is discharged as a regenerated liquid. Wherein at least one of sulfate ions, sulfite ions and nitrate ions are adsorbed in the ion exchange material, and the regenerating of the ion exchange material comprises: the ions in the regenerant replace the ions adsorbed in the ion exchange material. The method and the device for regenerating the desulfurization and denitrification ion exchange material by the ion exchange method can regenerate the ion exchange material used in the integrated desulfurization and denitrification process so as to realize the reutilization of the ion exchange material.

Description

Method and device for regenerating ion exchange material for desulfurization and denitrification by ion exchange method
Technical Field
The disclosure relates to the technical field of flue gas desulfurization and denitration, in particular to a method and a device for regenerating a desulfurization and denitration ion exchange material by an ion exchange method.
Background
The industrial flue gas mainly refers to flue gas and dust generated by combustion of an industrial boiler. The national energy structure mainly based on fire coal discharges sulfur dioxide (SO) along with the rapid development of economy in China2) Nitrogen Oxide (NO)x) Accounting for more than 60 percent of the total emission, in order to avoid the adverse effect of the direct emission of the flue gas on the environment, the industrial flue gas is usually subjected to desulfurization and denitrification treatment.
Disclosure of Invention
In one aspect, some embodiments of the present disclosure provide a method for regenerating an ion exchange material for desulfurization and denitrification by an ion exchange method, in which a regenerant is passed through the ion exchange material at a certain spatial flow rate to regenerate the ion exchange material; wherein at least one of sulfate ions, sulfite ions and nitrate ions are adsorbed in the ion exchange material, and the regenerating of the ion exchange material comprises: the ions in the regenerant replace the ions adsorbed in the ion exchange material; the liquid after the ion exchange material is regenerated is discharged as a regenerated liquid.
At least in the present disclosureIn one embodiment, the regenerant comprises Na in a mass concentration of 5% to 12%2CO3And (3) solution.
In at least one embodiment of the present disclosure, the regenerant is used in an amount of twice the volume of the ion exchange material and the space flow rate is 2m3/h/m3The regeneration time of the ion exchange material was 1 hour.
In at least one embodiment of the present disclosure, the ion exchange method for regenerating the desulfurization and denitrification ion exchange material further comprises: in the current ion exchange material regeneration process, for the discharged regeneration liquid with the volume twice that of the ion exchange material, recovering the regeneration liquid with the volume twice that of the previous regeneration liquid to a regeneration liquid recovery tank, and recovering the regeneration liquid with the volume twice that of the next regeneration liquid to a regeneration liquid recycling tank; in the next regeneration process of the ion exchange material, the regeneration liquid in the regeneration liquid recycling pool is used as a regenerant with the volume being the first time of that of the ion exchange material to regenerate the ion exchange material; and introducing a regenerant with the volume being twice that of the ion exchange material into the ion exchange material to regenerate the ion exchange material.
In at least one embodiment of the present disclosure, the regeneration period of the ion exchange material is between 48 hours and 72 hours.
In another aspect, some embodiments of the present disclosure provide a method for performing desulfurization and denitrification by using an ion exchange method, including: carrying out cooling, dust removal and humidification pretreatment on industrial flue gas; mixing the pretreated industrial flue gas with ozone for oxidation reaction, so that nitric oxide in the industrial flue gas is oxidized into high-valence nitric oxide and at least part of sulfur dioxide is oxidized into sulfur trioxide; making the oxidized flue gas pass through an ion exchange material, so that sulfur dioxide, sulfur trioxide and high-valence nitrogen oxide in the oxidized flue gas and the ion exchange material are subjected to ion exchange reaction and adsorbed to obtain gas meeting the emission standard; the ion exchange material is regenerated by adopting the ion exchange method for desulfurization and denitrification as described in any one of the above embodiments.
In another aspect, some embodiments of the present disclosure provide an ion exchange method for regenerating an ion exchange material for desulfurization and denitrification, including: the ion exchange tower is internally provided with an ion exchange material; and, a regeneration liquid recovery tank; the liquid inlet of the regeneration liquid recovery tank is connected with the liquid outlet of the ion exchange tower.
In at least one embodiment of the present disclosure, the ion exchange method desulfurization and denitrification ion exchange material regeneration device further includes a regeneration liquid recycling tank, and a liquid inlet of the regeneration liquid recycling tank is connected with a liquid outlet of the ion exchange tower.
In at least one embodiment of the present disclosure, the ion exchange method desulfurization and denitrification ion exchange material regeneration device further includes: the first pump body is arranged between the liquid outlet of the regeneration liquid recycling pool and the liquid inlet of the ion exchange tower.
In at least one embodiment of this disclosure, the ion exchange method SOx/NOx control ion exchange material regenerating unit still includes that the regenerant prepares the pond, and the liquid outlet of regenerant preparation pond is connected with the inlet of ion exchange tower.
In at least one embodiment of the present disclosure, the ion exchange method desulfurization and denitrification ion exchange material regeneration device further includes: and the second pump body is arranged between the liquid outlet of the regenerant preparation pool and the liquid inlet of the ion exchange tower.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.
FIG. 1 is a schematic structural diagram of an ion exchange desulfurization and denitrification ion exchange material regeneration device according to some embodiments.
Reference numerals:
1-ion exchange tower, 2-regenerated liquid recovery tank, 3-regenerated liquid recycling tank, 4-regenerant preparation tank, 5-first pump body and 6-second pump body.
Detailed Description
The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As described in the background, in order to avoid the adverse effect of the emission of flue gas on the environment, the industrial flue gas needs to be subjected to desulfurization and denitrification treatment. The sulfur dioxide in the industrial flue gas accounts for more than 85 percent of the total emission of the flue gas and is accompanied with the generation of nitrogen oxide, the main component of the nitrogen oxide is nitric oxide, and the nitric oxide accounts for 90 to 95 percent of the total amount of the nitrogen oxide. SO that the object for industrial flue gas treatment is mainly SO2And NO. In order to simplify the process flow of desulfurization and denitrification and reduce the cost for treating industrial waste gas, the inventor of the present disclosure provides an integrated desulfurization and denitrification process method capable of synchronously removing sulfur dioxide and nitrogen oxides, that is, a method for desulfurization and denitrification by using an ion exchange method.
On the one hand, due to SO2The solubility is not high, belongs to medium solubility, and the solubility of NO is very low, so that the effect of simultaneous desulfurization and denitrification is not easily achieved by completely depending on water dissolution or alkali liquor absorption. On the other hand, SO2And NO both have reducing properties, SO being present when contacted with a strong oxidizing agent2Will be oxidized to SO3，SO3Very soluble in water to form H2SO4(ii) a And NO is oxidized to NO2And N2O5，NO2And N2O5Very soluble in water to generate HNO3. Based on this, SO is simultaneously oxidized with a strong oxidizing agent2And NO, to make it into SO which is very soluble in water3、NO2And N2O5Is the key for simultaneously desulfurizing and denitrating.
Therefore, in the process of desulfurization and denitrification by an ion exchange method, firstly, the industrial flue gas is subjected to cooling, dedusting and humidifying pretreatment. Then, mixing the pretreated industrial flue gas with ozone for oxidation reactionSo that nitrogen monoxide in the industrial flue gas is oxidized into high-valence nitrogen oxide and at least part of sulfur dioxide is oxidized into sulfur trioxide. Namely, ozone with a certain molar ratio is added into the industrial flue gas after temperature reduction, dust removal and humidification treatment, SO that NO and part of SO in the industrial flue gas2Is rapidly oxidized to NO2、N2O5And SO3And the like. The chemical reaction equation is as follows:
NO+O3→NO2+O2
NO2+O3→NO3+O2
NO3+NO2→N2O5
NO2+NO2→N2O4
N2O4+O3→N2O5+O2
SO2+O3→SO3+O2
and (3) passing the oxidized flue gas through the ion exchange material, so that sulfur dioxide, sulfur trioxide and high-valence nitrogen oxide in the oxidized flue gas are adsorbed by the ion exchange reaction with the ion exchange material, and gas meeting the emission standard is obtained.
In particular, gaseous SO2、SO3、NO2And N2O5Dissolving in water to generate sulfurous acid, sulfuric acid, nitric acid and the like. The water-soluble water and the reaction are reversible, and the chemical reaction equation is as follows:
Figure BDA0002421880850000044
Figure BDA0002421880850000041
Figure BDA0002421880850000042
Figure BDA0002421880850000043
then, the desulfurization and denitrification are carried out by adopting an ion exchange method, and the treatment process can be carried out in a plurality of ion exchange towers. Optionally, a strong-base ion exchange material is filled in the ion exchange tower, and the ion exchange material is subjected to humidification treatment, so that the adsorption rate of the ion exchange material on the industrial flue gas is improved. After ion exchange, sulfur dioxide and nitrogen oxide in the flue gas are respectively adsorbed by the ion exchange material in the form of sulfate ions, sulfite ions and nitrate ions, and undergo ion exchange reaction with carbonate ions on the ion exchange material, so that the aim of simultaneously desulfurizing and denitrating is fulfilled, and the gas (flue gas) meeting the emission standard is obtained. The reaction equation is as follows:
R2CO3+SO3 2-+2H+→R2SO3+CO2↑+H2O
R2CO3+SO4 2-+2H+→R2SO4+CO2↑+H2O
R2CO3+2NO3 1-+2H+→2RNO3+CO2↑+H2O
when the ion exchange material adsorbs sulfate ions, sulfite ions, and nitrate ions to reach a saturated state, the ion exchange material cannot adsorb the ions.
On the basis, the present disclosure provides a method and an apparatus for regenerating an ion exchange material for desulfurization and denitrification by an ion exchange method, wherein the ion exchange material used in the integrated desulfurization and denitrification process is regenerated to realize the reuse of the ion exchange material.
Some embodiments of the present disclosure provide methods for regenerating an ion exchange desulfurization and denitrification ion exchange material, including S1 and S2.
And S1, enabling the regenerant to pass through the ion exchange material according to a certain space flow rate, and regenerating the ion exchange material. Wherein at least one of sulfate ions, sulfite ions and nitrate ions is adsorbed in the ion exchange material.
Illustratively, the ion exchange material can be a strongly basic anion exchange fiber, such as an anion exchange fiber containing quaternary amino functional groups or secondary amino functional groups, or a strongly basic anion exchange resin.
Exemplarily, the regenerant is Na with the mass concentration of 5-12%2CO3Solution, optionally, regenerant Na2CO3The mass concentration of the solution is 5%, 8%, 10%, 12%, or the like.
Regenerating the ion exchange material comprises: the ions in the regenerant replace the ions adsorbed in the ion exchange material, i.e., Na2CO3After the solution passes through the saturated ion exchange material, a large amount of sulfate ions, sulfite ions and nitrate ions adsorbed on the ion exchange material are replaced by carbonate ions, so that the ion exchange material is restored to carbonate ions, and the ion exchange material can be continuously used. The reaction equation is as follows:
R2SO3+Na2CO3→R2CO3+Na2SO3
R2SO4+Na2CO3→R2CO3+Na2SO4
2RNO3+Na2CO3→R2CO3+2NaNO3
s2, the liquid obtained by regenerating the ion exchange material is discharged as a regeneration liquid.
According to the regeneration method of the ion exchange desulfurization and denitrification ion exchange material provided by some embodiments of the disclosure, the regenerant is used for regenerating the ion exchange material with saturated adsorption, and the regenerability of the ion exchange material can be fully utilized, so that the ion exchange material can be recycled, resources can be saved, and the use cost of the ion exchange material can be greatly reduced.
The ion exchange column provided with the ion exchange material may be provided with an exhaust port, and the timing of regenerating the ion exchange material may be determined by detecting the composition and concentration of the gas exhausted from the exhaust port of the ion exchange column. If the discharge amount of sulfur dioxide and nitrogen oxide in the discharged gas is found to be excessive, the regeneration of the ion exchange material can be started. In at least one embodiment of the present disclosure, the regeneration period of the ion exchange material is 48 hours to 72 hours, that is, after the ion exchange material is used for 48 hours to 72 hours (the specific time can be determined according to the actual use condition of the ion exchange material), the discharge amount of sulfur dioxide and nitrogen oxide in the exhaust gas of the exhaust port of the ion exchange tower begins to exceed the standard, and the ion exchange material needs to be regenerated.
In at least one embodiment of the present disclosure, the regenerant is used in an amount of twice the volume of the ion exchange material, and the space flow rate of the regenerant through the ion exchange material is 2m3/h/m3The regeneration time of the ion exchange material was 1 hour. The space flow rate of the regenerant is too high, which easily causes low regeneration efficiency, and the space flow rate of the regenerant is too low, which causes the time consumed in the regeneration process of the ion exchange material to be longer, and reduces the production efficiency of the whole desulfurization and denitrification process flow. Thus, the regenerant was in the order of 2m3/h/m3The space flow rate of (2) is through the ion exchange material, so that the regeneration efficiency and the regeneration consumption time can be better considered.
The inventor of the present disclosure finds that, in the process of regenerating the ion exchange material, a regenerant with the volume twice that of the ion exchange material is introduced into the ion exchange material, wherein the regeneration efficiency of the introduced regenerant with the first time (first time) is very high and can reach more than 60%, and the recovered regeneration liquid has high concentrations of sulfate ions, sulfite ions and nitrate ions; the regeneration efficiency of the second-time (second-time) regenerant is low, the average regeneration efficiency is about 20 percent, the concentrations of sulfate ions, sulfite ions and nitrate ions in the recovered regeneration liquid are low, and the recovered liquid still contains a large amount of Na2CO3And (3) components. Here, the regeneration efficiency is calculated by calculating sulfate ions substituted by carbonate ions, sulfite ions and nitric acidThe amount of the radical ion is determined as a proportion of the total amount of the sulfate ion, sulfite ion and nitrate ion adsorbed by the ion exchange material.
Based on this, in at least one embodiment of the present disclosure, the present disclosure employs a "first-fold recovery, latter-fold reuse" process flow. That is, the regeneration method of the ion exchange material for desulfurization and denitrification by the ion exchange method further comprises the following steps: in the current ion exchange material regeneration process, for the discharged regeneration liquid with the volume twice that of the ion exchange material, recovering the regeneration liquid with the volume twice that of the previous regeneration liquid to a regeneration liquid recovery tank, and recovering the regeneration liquid with the volume twice that of the next regeneration liquid to a regeneration liquid recycling tank; in the next regeneration process of the ion exchange material, the regeneration liquid in the regeneration liquid recycling pool is used as a regenerant with the volume being the first time of that of the ion exchange material to regenerate the ion exchange material; and introducing a regenerant with the volume being twice that of the ion exchange material into the ion exchange material to regenerate the ion exchange material. This can save the amount of the regenerant (at least twice the amount of the regenerant) and reduce the amount of the regeneration waste liquid (i.e., the regeneration liquid introduced into the regeneration liquid recovery tank) (at least twice the amount of the regeneration waste liquid). The concentration of the regenerated waste liquid is higher, which is beneficial to the centralized treatment of the regenerated waste liquid. In addition, due to the reduction of the amount of the regenerated waste liquid, the amount of the regenerated waste liquid to be treated later can be relatively reduced, and the cost of the later-stage waste liquid treatment is further reduced.
In addition, the process of 'recovering the first time and recycling the last time' of the ion exchange material continuously regenerated by twice the volume of the ion exchange material according to twice the space flow rate is adopted in some embodiments of the disclosure, compared with the process of non-continuous regeneration (for example, the injection of the regenerating agent has pause, interval or waiting time), the process of continuous regeneration is simple and convenient to operate, the structure of a control system for regenerating the ion exchange material is simplified, the regeneration time can be saved, and the regeneration efficiency is obviously improved. In addition, the dynamic regeneration efficiency of the continuously injected regenerant is far higher than that of static regeneration (for example, discontinuous regeneration), so that the occurrence of reversible reaction in the ion exchange regeneration process is avoided, and a better regeneration effect is obtained.
The method for regenerating the ion exchange material for desulfurization and denitrification by the ion exchange method provided by the present disclosure is described in detail below with reference to examples.
In the integrated desulfurization and denitrification process, the integrated desulfurization and denitrification is carried out on the industrial flue gas by adopting an ion exchange method, and after 70 hours, the discharge amounts of sulfur dioxide and nitrogen oxide in the gas discharged from the exhaust port of the ion exchange tower are increased to exceed preset discharge amounts, for example, the discharge amounts of sulfur dioxide and nitrogen oxide are respectively greater than 35/50mg/m3Then the first ion exchange material regeneration process is carried out.
For the selection of regenerant concentrations, refer to table 1.
TABLE 1
Figure BDA0002421880850000081
As can be seen from the above table, Na with a mass concentration of 5% to 12%2CO3The solution can achieve better regeneration efficiency, wherein, the mass concentration of Na is 10 percent and 12 percent2CO3The regeneration efficiency of the solution is relatively high, the requirement of the ion exchange material for repeated use can be better met, and in view of the operation cost, Na with the mass concentration of 10 percent is selected2CO3The solution is suitable, so that high regeneration efficiency can be ensured, and the cost can be reasonably controlled.
Based on this, in the present example, when the ion exchange material is first regenerated, Na having a mass concentration of 10% is used2CO3The solution is used as a regenerant, and the regenerant is added according to the proportion of 2m3/h/m3The space flow rate of the catalyst is introduced into the ion exchange tower from the outside, the introduction time is 1h, and the volume of the introduced regenerant is twice of the volume of the ion exchange material.
Wherein, in the process of introducing the first time volume of the regenerant, the liquid outlet of the ion exchange tower also discharges the regenerant with one time volume of the ion exchange material, and the regenerant with the previous time (first time) volume is recycled to the regenerant recycling tank. In the process of introducing the second volume of the regenerant, the liquid outlet of the ion exchange tower also discharges one volume of the regenerant, and the latter one (second) volume of the regenerant is recycled to the regenerant recycling tank.
After the ion exchange material is regenerated, ion exchange desulfurization and denitrification can be carried out continuously, and after 65 hours, the discharge amount of sulfur dioxide and nitrogen oxide in the gas discharged from the exhaust port of the ion exchange tower begins to increase to exceed the preset discharge amount, for example, the discharge amount of sulfur dioxide and the discharge amount of nitric oxide are respectively greater than 35/50mg/m3And then enters the next (second) ion exchange material regeneration process.
The regeneration liquid with the volume which is one time after that collected in the regeneration liquid recycling pool in the previous ion exchange material regeneration process is recycled according to the volume of 2m3/h/m3The space flow velocity is introduced into the ion exchange tower to regenerate the ion exchange material, and the regenerated waste liquid (namely the regenerated liquid) enters a regenerated liquid recovery pool.
Then, Na having a mass concentration of 10% prepared in advance was added2CO3Solution according to 2m3/h/m3The space flow rate is introduced into the ion exchange tower from the outside, the volume of the space flow rate is one time of the volume of the ion exchange material, the ion exchange material is continuously regenerated, and the regenerated liquid generated in the process enters a 'regenerated liquid recycling pool' to be recycled in the next period.
According to the regeneration method of the ion exchange desulfurization and denitrification ion exchange material provided by some embodiments of the disclosure, by adopting the process of 'recycling once before and recycling once after', the dosage of the regenerant with the volume of one time of that of the ion exchange material is saved, the amount of the regeneration waste liquid with the volume of one time of that of the ion exchange material is reduced, and the pressure is relieved for the next treatment of the regeneration waste liquid. The adoption of the process of 'recycling the former time and recycling the latter time' saves half of the operation cost in the aspect of the consumption of the regenerant and can effectively reduce the production cost.
Some embodiments of the present disclosure also provide a method for performing desulfurization and denitrification by using an ion exchange method, including: carrying out cooling, dust removal and humidification pretreatment on industrial flue gas; mixing the pretreated industrial flue gas with ozone for oxidation reaction, so that nitric oxide in the industrial flue gas is oxidized into high-valence nitric oxide and at least part of sulfur dioxide is oxidized into sulfur trioxide; making the oxidized flue gas pass through an ion exchange material, so that sulfur dioxide, sulfur trioxide and high-valence nitrogen oxide in the oxidized flue gas and the ion exchange material are subjected to ion exchange reaction and adsorbed to obtain gas meeting the emission standard; the ion exchange material is regenerated by adopting the ion exchange method for desulfurization and denitrification as described in any one of the above embodiments. The specific processes and beneficial effects of the method for performing desulfurization and denitrification by using the ion exchange method refer to the description in the foregoing embodiments, and are not repeated herein.
Referring to fig. 1, some embodiments of the present disclosure further provide an ion exchange method regeneration apparatus for a desulfurization and denitrification ion exchange material, which can be used to implement the ion exchange method regeneration method for a desulfurization and denitrification ion exchange material described in any of the above embodiments.
The ion exchange method desulfurization and denitrification ion exchange material regeneration device comprises an ion exchange tower 1 and a regeneration liquid recovery tank 2. An ion exchange material is arranged in the ion exchange tower 1; the ion exchange column 1 may also be provided with at least one inlet for the introduction of a regenerant. The liquid inlet of the regeneration liquid recovery tank 2 is connected with the liquid outlet of the ion exchange tower 1.
In at least one embodiment of the present disclosure, the ion exchange method desulfurization and denitrification ion exchange material regeneration device further includes a regeneration liquid recycling tank 3, and a liquid inlet of the regeneration liquid recycling tank 3 is connected with a liquid outlet of the ion exchange tower 1.
A valve can be arranged between the liquid inlet of the regeneration liquid recovery tank 2 and the liquid outlet of the ion exchange tower 1, and a valve can be arranged between the liquid inlet of the regeneration liquid recovery tank 3 and the liquid outlet of the ion exchange tower 1. The valve is, for example, an electronic valve, and is used for controlling the flow direction of the regeneration liquid through the mutual matching of opening and closing in the regeneration process of the ion exchange material.
In at least one embodiment of the present disclosure, the ion exchange method desulfurization and denitrification ion exchange material regeneration device further includes: the first pump body 5 is arranged between the liquid outlet of the regenerated liquid recycling pool 3 and the liquid inlet of the ion exchange tower 1 and is used for pumping the regenerated liquid in the regenerated liquid recycling pool 3 into the ion exchange tower 1.
In at least one embodiment of the present disclosure, the ion exchange method desulfurization and denitrification ion exchange material regeneration device further includes a regenerant preparation tank 4, which can be used for preparing Na with a mass concentration of 10%2CO3And (3) solution. The liquid outlet of the regenerant preparation tank 4 is connected with the liquid inlet of the ion exchange tower 1.
In at least one embodiment of the present disclosure, the ion exchange method desulfurization and denitrification ion exchange material regeneration device further includes: and the second pump body 6 is arranged between the liquid outlet of the regenerant preparation tank 4 and the liquid inlet of the ion exchange tower 1 and is used for pumping the regenerant in the regenerant preparation tank 4 into the ion exchange tower 1.
The embodiments in the present specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the product embodiments, since they are substantially similar to the method embodiments, they are described simply, and reference may be made to some descriptions of the product embodiments for relevant points.
In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise. Meanwhile, in the description of the present disclosure, unless otherwise explicitly specified or limited, the terms "connected" and "connected" should be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; the connection can be mechanical connection or electrical connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.
It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.

Claims (10)

1. A method for regenerating ion exchange material for desulfurization and denitrification by ion exchange method is characterized in that,
enabling a regenerant to pass through an ion exchange material according to a certain space flow rate to regenerate the ion exchange material; wherein at least one of sulfate ions, sulfite ions, and nitrate ions are adsorbed in the ion exchange material, and regenerating the ion exchange material comprises: the ions in the regenerant replace the ions adsorbed in the ion exchange material;
discharging the liquid after the ion exchange material is regenerated as a regeneration liquid.
2. The method for regenerating the ion exchange material for desulfurization and denitrification through the ion exchange process according to claim 1, wherein the regenerant comprises Na with the mass concentration of 5-12%2CO3And (3) solution.
3. The method for regenerating an ion exchange material for desulfurization and denitrification by ion exchange process according to claim 1, wherein the amount of the regenerant is two times the volume of the ion exchange material, and the space flow rate is 2m3/h/m3The regeneration time of the ion exchange material was 1 hour.
4. The method for regenerating an ion exchange desulfurization and denitrification ion exchange material according to claim 3, wherein the method for regenerating an ion exchange desulfurization and denitrification ion exchange material further comprises:
in the regeneration process of the current ion exchange material, for the discharged regeneration liquid with the volume twice that of the ion exchange material, recovering the regeneration liquid with the volume twice that of the previous regeneration liquid to a regeneration liquid recovery tank, and recovering the regeneration liquid with the volume twice that of the next regeneration liquid to a regeneration liquid recycling tank;
in the next regeneration process of the ion exchange material, the regeneration liquid in the regeneration liquid recycling pool is used as a regenerant with the volume being the first time of that of the ion exchange material to regenerate the ion exchange material; and introducing a regenerant with the volume being twice that of the ion exchange material into the ion exchange material to regenerate the ion exchange material.
5. The method for regenerating the ion exchange material for desulfurization and denitrification through the ion exchange process according to claim 1, wherein the regeneration period of the ion exchange material is 48 to 72 hours.
6. A method for desulfurization and denitrification by adopting an ion exchange method is characterized by comprising the following steps:
carrying out cooling, dust removal and humidification pretreatment on industrial flue gas;
mixing the pretreated industrial flue gas with ozone for oxidation reaction, so that nitric oxide in the industrial flue gas is oxidized into high-valence nitric oxide and at least part of sulfur dioxide is oxidized into sulfur trioxide;
making the oxidized flue gas pass through an ion exchange material, so that sulfur dioxide, sulfur trioxide and high-valence nitrogen oxide in the oxidized flue gas and the ion exchange material are subjected to ion exchange reaction and adsorbed to obtain gas meeting the emission standard;
the ion exchange material is regenerated by adopting the ion exchange method desulfurization and denitrification ion exchange material regeneration method of any one of claims 1-5.
7. An ion exchange method SOx/NOx control ion exchange material regenerating unit includes:
the ion exchange tower is internally provided with an ion exchange material;
and, a regeneration liquid recovery tank; and a liquid inlet of the regeneration liquid recovery tank is connected with a liquid outlet of the ion exchange tower.
8. The ion exchange method desulfurization and denitrification ion exchange material regeneration device according to claim 7, further comprising a regeneration liquid recycling tank, wherein a liquid inlet of the regeneration liquid recycling tank is connected with a liquid outlet of the ion exchange tower.
9. The ion exchange desulfurization and denitrification ion exchange material regeneration device according to claim 8, further comprising: the first pump body is arranged between the liquid outlet of the regeneration liquid recycling pool and the liquid inlet of the ion exchange tower.
10. The ion exchange desulfurization and denitrification ion exchange material regeneration device according to claim 7, further comprising:
a liquid outlet of the regenerant preparation tank is connected with a liquid inlet of the ion exchange tower; and
and the second pump body is arranged between the liquid outlet of the regenerant preparation pool and the liquid inlet of the ion exchange tower.
CN202010208167.2A 2020-03-23 2020-03-23 Method and device for regenerating ion exchange material for desulfurization and denitrification by ion exchange method Pending CN111359681A (en)

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CN202011458264.3A CN112588329A (en) 2020-03-23 2020-12-11 Method and device for regenerating ion exchange material for desulfurization and denitrification by ion exchange method

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CN101838064A (en) * 2010-01-26 2010-09-22 中国环境科学研究院 Method for recycling manganese ion in electrolytic manganese production tail end wastewater
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