CN113941225A - Resource method for improving nitric acid dissolved metal tail gas - Google Patents

Resource method for improving nitric acid dissolved metal tail gas Download PDF

Info

Publication number
CN113941225A
CN113941225A CN202111185098.9A CN202111185098A CN113941225A CN 113941225 A CN113941225 A CN 113941225A CN 202111185098 A CN202111185098 A CN 202111185098A CN 113941225 A CN113941225 A CN 113941225A
Authority
CN
China
Prior art keywords
gas
tail gas
oxygen
nitrogen
nitric acid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111185098.9A
Other languages
Chinese (zh)
Inventor
刘建英
何俊良
杨曦怒
徐成华
田黎霞
杨皓
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chengdu University of Information Technology
Original Assignee
Chengdu University of Information Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chengdu University of Information Technology filed Critical Chengdu University of Information Technology
Priority to CN202111185098.9A priority Critical patent/CN113941225A/en
Publication of CN113941225A publication Critical patent/CN113941225A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/18—Absorbing units; Liquid distributors therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1406—Multiple stage absorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1412—Controlling the absorption process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1418—Recovery of products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1493—Selection of liquid materials for use as absorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/76—Gas phase processes, e.g. by using aerosols
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/14—Production of inert gas mixtures; Use of inert gases in general
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B21/00—Nitrogen; Compounds thereof
    • C01B21/20—Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
    • C01B21/38—Nitric acid
    • C01B21/40—Preparation by absorption of oxides of nitrogen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/10—Oxidants
    • B01D2251/102—Oxygen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/10—Inorganic absorbents
    • B01D2252/103—Water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/025—Other waste gases from metallurgy plants

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Inorganic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Treating Waste Gases (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

The method is used for solving the problem of a large amount of NO generated in the dissolved metal industryxThe exhaust gas is recycled by absorbing and converting the discharged tail gas. The method is characterized in that tail gas is pressurized to 0.01-0.8 MPa, and isobaric pure nitrogen, absorbed tail gas and pure oxygen are added at the same timeThe mixed gas is called oxidizing gas; the molar ratio of oxygen to nitric oxide is 1: 1-5, wherein the molar ratio of pure nitrogen to oxygen is 1: 1-5, mixing the two gases to obtain a raw material gas; the raw material gas is sent into more than two serial water absorption towers, the absorption towers adopt vertical equipment in the modes of bubbling, tower plates and packing, and the concentration of NOx contained in the last stage of absorption tail gas is lower than 200 ppm; and (3) after the absorbed tail gas is dried, pressurizing and feeding back the oxidized gas, controlling the oxygen-nitrogen ratio, when the nitrogen concentration is too high, feeding the dried tail gas into an after-treatment tower to be called as vent gas, and discharging NOx in the vent gas after reaching the standard, so that the nitric acid with the required concentration is obtained without polluting the environment. The method and the device for treating the dissolved metal tail gas are simple, the investment cost and the equipment cost are low, and the treatment effect is good.

Description

Resource method for improving nitric acid dissolved metal tail gas
Technical Field
The invention relates to the field of metallurgy, energy conservation and environmental protection, and discloses a method for effectively dissolving metal solids, reducing the emission of atmospheric pollutants and recycling nitric acid so as to reduce resource consumption.
Background
The metal tail gas is a byproduct in the process of smelting and dissolving metal by enterprises, and mainly contains NO. Nitric acid can oxidize most metals, and when the conditions of the nitric acid and the metals are different, the reduction products of the nitric acid are different, and generally, when the metals after the metals are sequentially discharged into hydrogen react with the nitric acid, the concentrated nitric acid reacts violently to generate nitrate and NO2(ii) a Reaction with dilute nitric acid often requires heating to form nitrates and NO. When nitric acid reacts with a metal that is actively sequenced before hydrogen, the reduction product is more complex due to the strong reducing properties of the metal. Except for the formation of NO, NO2In addition, N can be produced in the production of dilute nitric acid2O、N2、NH3。NO、NO2The untreated gas is discharged into the atmosphere to cause serious atmospheric pollution. Therefore, the gas generated after the nitric acid dissolves the metal needs to be treated and purified to reach a certain standard before being discharged into the atmosphere.
Wangzhang Xia et al CN111068476A published a Chinese patent application of' recovering NOxThe device of (1), characterized by: comprises an absorption tower and a regeneration tank which are connected with each other, a clapboard and a downcomer are arranged at the bottom of the absorption tower, and an air pocket is formed with a liquid phase interface at the bottom of the absorption tower to collect the dynamic absorption liquidAbsorbed NOxThe gas is provided with an electrolyzer in the regeneration tank, and an air cavity formed by the liquid level and the wall surface of the regeneration tank is also used for collecting the analysis gas and further analyzing NO absorbed by the absorption liquid when the absorption liquid passes throughxThe gas and the absorption liquid are regenerated. However, the patent is only suitable for the treatment equipment of the boiler tail gas, and has larger limitation.
Zhang Yanling etc. CN106669383A announced that it contains NOxThe treatment method of the process tail gas comprises the following steps: (1) will contain high concentration of NOxIntroducing the process tail gas into a primary oxidizer for oxidation treatment; (2) respectively introducing the process tail gas after the first-stage oxidation and the absorption liquid from the first-stage circulation tank into a hypergravity rotating bed reactor, mixing and reacting the process tail gas and the absorption liquid in the hypergravity rotating bed reactor, and mixing and reacting part of NO in the process tail gasxAbsorbed, and the absorption liquid returns to the first-stage circulation tank for recycling; (3) introducing the residual tail gas after the absorption treatment in the step (2) into a secondary oxidizer for oxidation treatment, dividing absorption liquid in a secondary circulating tank into a branch 1 and a branch 2 after passing through a secondary circulating pump, introducing the tail gas after the secondary oxidation and the branch 1 into a high-efficiency absorption tower, absorbing the tail gas by the absorption liquid, returning the absorption liquid to the secondary circulating tank, introducing the branch 2 into a primary circulating tank, mixing and reacting with the absorption liquid in the primary circulating tank, and demisting the treated tail gas and then discharging the tail gas up to the standard. Thus, part of NO can be achievedxThe absorption of the exhaust gas is recycled, but it is inevitable to increase the investment cost and the equipment cost.
Wangming Homoku et al CN109173639A announces that the invention belongs to the technical field of nitric acid production devices, and discloses a nitric acid tail gas denitration process. The process takes ammonia tank exhausted gas of synthetic ammonia as a reducing agent, the exhausted gas is sprayed into nitric acid tail gas at a certain temperature (determined according to the initial activity temperature of a catalyst), the nitric acid tail gas and the nitric acid tail gas are uniformly mixed and then enter a denitration reactor, wherein hydrogen and oxygen react to generate water, and NO in the tail gas is converted into water by ammonia gasxDecomposing to generate nitrogen and water vapor which have no pollution to the environment and finally discharging to the atmosphere. The reducing agent adopts the purge gas of the synthetic ammonia tank, which can reduce the difficulty and energy consumption of the recovery of the purge gas and reduce the use of the raw material ammonia. By utilizing the characteristic that hydrogen easily reacts with oxygen,can activate the catalyst at a lower temperature to react ammonia with NOxThe selective reaction of (2) is easier to carry out. However, the practical significance of the process limiting conditions is not large, the waste gas treatment and the production process are not combined, and the waste gas resource utilization is not shown.
For NOxThe treatment of industrial waste gas has gone through a process of continuous summarization, continuous improvement and gradual improvement. NaNO produced by water washing method and alkali washing method which are adopted once and can cause acid pollution to water field2、NaNO3Difficult to recover and the utilization of by-products is also a problem. The selective catalytic ammonia reduction method is a novel high-efficiency treatment method, but in the operation practice of the device, the method is found to be applicable to the discharge with discontinuous discharge time and non-uniform NOxA source of occurrence.
Disclosure of Invention
A resource method for improving nitric acid to dissolve metal tail gas is characterized in that tail gas is pressurized to 0.01-0.8 MPa, and isobaric pure nitrogen, absorbed tail gas and pure oxygen mixed gas are added to be called as oxidation gas; the molar ratio of oxygen to nitric oxide is 1: 1-5, wherein the molar ratio of pure nitrogen to oxygen is 1: 1-5, mixing the two gases to obtain a raw material gas; the raw material gas is fed into more than two serially connected water absorption towers, the absorption towers adopt vertical equipment in the modes of bubbling, tower plates and packing, and the final stage of absorption tail gas contains NOxThe concentration is lower than 200 ppm; absorbing the tail gas, drying, pressurizing and feeding back the oxidized gas, controlling the oxygen-nitrogen ratio, feeding the dried tail gas into a post-treatment tower to be called blow-down gas when the nitrogen concentration is too high, wherein NO in the blow-down gasxDischarging after the concentration reaches the standard; thereby obtaining nitric acid with required concentration without polluting the environment.
The starting pure nitrogen may be replaced by air, oxygen-enriched air, inert gas. Thereby, the oxygen fed into the absorption tower is efficiently utilized as the effective NO gas oxidizing gas, and the NO discharged out of the systemxThe total amount of gas is only 0.1-5% of that of the traditional process compared with the process of an absorption tower which totally uses air as the oxidizing gas, and the NO is greatly reducedxThe treatment amount of the tail gas reduces the treatment cost.
Drawings
FIG. 1 is a process flow diagram.
Detailed Description
Example 1: pressurizing the tail gas to 0.01Mpa, and simultaneously adding isobaric pure nitrogen, absorbed tail gas and pure oxygen mixed gas to be called as oxic gas; the molar ratio of oxygen to nitric oxide is 1:1, and the molar ratio of pure nitrogen to oxygen is 1: 1. Mixing the two gases, feeding the mixture into a series water absorption tower, and absorbing the tail gas and NO in the last stage of tail gas absorption in the absorption towerxLess than 200 ppm; absorbing tail gas, drying, pressurizing, returning to oxidizing gas, introducing the dried tail gas into a treating tower when the concentration of nitrogen is too high, and discharging NO in the gasxThe concentration of the obtained diluted nitric acid is 100ppm and reaches 40 percent. Pure nitrogen is added for the first time, and nitrogen addition is stopped when the nitrogen is high. Pure nitrogen may use air or other inert gas.
Example 2: pressurizing the tail gas to 0.4Mpa, and simultaneously adding isobaric pure nitrogen, absorbed tail gas and pure oxygen mixed gas to be called as oxidized gas; the molar ratio of oxygen to nitric oxide is 1:3, and the molar ratio of pure nitrogen to oxygen is 1: 3. Mixing the two gases, feeding the mixture into a series water absorption tower, and absorbing the tail gas and NO in the last stage of tail gas absorption in the absorption towerxLess than 200 ppm; absorbing tail gas, drying, pressurizing, returning to oxidizing gas, introducing the dried tail gas into a treating tower when the concentration of nitrogen is too high, and discharging NO in the gasxAt 80ppm, a dilute nitric acid concentration of up to 50% was obtained. Pure nitrogen is added for the first time, and nitrogen addition is stopped when the nitrogen is high. Pure nitrogen may use air or other inert gas.
Example 3: pressurizing the tail gas to 0.8Mpa, and simultaneously adding isobaric pure nitrogen, absorbed tail gas and pure oxygen mixed gas to be called as oxidized gas; the molar ratio of oxygen to nitric oxide is 1:5, and the molar ratio of pure nitrogen to oxygen is 1: 5. Mixing the two gases, feeding the mixture into a series water absorption tower, and absorbing the tail gas and NO in the last stage of tail gas absorption in the absorption towerxLess than 200 ppm; absorbing tail gas, drying, pressurizing, returning to oxidizing gas, introducing the dried tail gas into a treating tower when the concentration of nitrogen is too high, and discharging NO in the gasxAt 160ppm, a dilute nitric acid concentration of 70% was obtained. Pure nitrogen is added for the first time, and nitrogen addition is stopped when the nitrogen is high. Pure nitrogen may use air or other inert gas.
The method is used for solving the problem of a large amount of NO generated in the dissolved metal industryxThe exhaust gas is recycled by absorbing and converting the discharged tail gas. The method and the device for treating the dissolved metal tail gas are simple, the investment cost and the equipment cost are low, and the treatment effect is good.

Claims (3)

1. A resource method for improving nitric acid to dissolve metal tail gas is characterized in that tail gas is pressurized to 0.01-0.8 MPa, and isobaric pure nitrogen, absorbed tail gas and pure oxygen mixed gas are added to be called as oxidation gas; the molar ratio of oxygen to nitric oxide is 1: 1-5, wherein the molar ratio of pure nitrogen to oxygen is 1: 1-5, mixing the two gases to obtain a raw material gas; the raw material gas is sent into more than two serial water absorption towers, the absorption towers adopt vertical equipment in the modes of bubbling, tower plates and packing, and the concentration of NOx contained in the last stage of absorption tail gas is lower than 200 ppm; after absorbing and drying the tail gas, pressurizing and feeding back the oxidized gas, controlling the oxygen-nitrogen ratio, when the nitrogen concentration is too high, feeding the dried tail gas into an after-treatment tower to be called as vent gas, and discharging NOx in the vent gas after reaching the standard; thereby obtaining nitric acid with required concentration without polluting the environment.
2. The process of claim 1 wherein the initial addition of pure nitrogen is stopped when the nitrogen level is high.
3. Pure nitrogen according to claim 1 may be used as air or other inert gas.
CN202111185098.9A 2021-10-12 2021-10-12 Resource method for improving nitric acid dissolved metal tail gas Pending CN113941225A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111185098.9A CN113941225A (en) 2021-10-12 2021-10-12 Resource method for improving nitric acid dissolved metal tail gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111185098.9A CN113941225A (en) 2021-10-12 2021-10-12 Resource method for improving nitric acid dissolved metal tail gas

Publications (1)

Publication Number Publication Date
CN113941225A true CN113941225A (en) 2022-01-18

Family

ID=79330509

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111185098.9A Pending CN113941225A (en) 2021-10-12 2021-10-12 Resource method for improving nitric acid dissolved metal tail gas

Country Status (1)

Country Link
CN (1) CN113941225A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114618270A (en) * 2022-03-07 2022-06-14 大连汉诺工程技术有限公司 Containing NOxTail gas normal-temperature denitration device and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114618270A (en) * 2022-03-07 2022-06-14 大连汉诺工程技术有限公司 Containing NOxTail gas normal-temperature denitration device and method

Similar Documents

Publication Publication Date Title
US10406479B2 (en) Method and apparatus for removing nitrogen oxides from gas streams
CN106215692B (en) A kind of processing method of carbon based metal organic backbone type oxide catalyst denitrating flue gas
CN103418218B (en) A kind of nitric acid oxidation method prepares the nitrogen-containing oxide exhaust gas treating method of dicarboxylic acids
CN112933915B (en) Nitrogen oxide waste gas recycling treatment device and method
CN109772427B (en) Catalyst for recycling sulfur and nitrogen in absorption liquid of magnesium-method simultaneous desulfurization and denitrification process and preparation and application thereof
CN103977681A (en) Denitration method for high-concentration nitric oxide flue gas
CN104437037A (en) Low-temperature fume oxidizing and denitration method and system
CN107638787A (en) The system and method for nitrogen oxides in a kind of removing gas
CN113941225A (en) Resource method for improving nitric acid dissolved metal tail gas
CN104353347A (en) Method and device for simultaneous reduction and oxidation of nitrogen oxides from airflow
CN214680967U (en) Nitrogen oxide waste gas resourceful treatment device
CN104785102A (en) Energy-saving and efficient N2O and NOx removing process
CN102794098A (en) Flue gas wet-type oxidation denitration and resource utilization method
CN204352744U (en) A kind of low-temperature flue gas oxidation and denitration system
CN113462900A (en) Method for recovering rhodium from waste rhodium park catalyst
CN105664700B (en) A kind of processing method and processing unit of nitrogen-containing oxide industrial waste gas
CN110538570B (en) N in caprolactam production waste gas 2 O and VOC co-processing system and method
CN109467065B (en) Stainless steel mixed acid waste liquid regenerated acid equipment
CN112957891B (en) Method for recycling nitrogen oxide waste gas in noble metal purification process
CN217092820U (en) NOx-containing tail gas normal-temperature denitration device
CN111151231B (en) Method for regenerating denitration ferric chloride adsorbent
CN115537828A (en) Pickling waste liquid recycling treatment system and method
CN112408433B (en) Production method of sodium metabisulfite with low nitrogen oxide emission
CN210786898U (en) N in caprolactam production waste gas2System for co-processing O and VOC
CN113617219A (en) Flue gas denitration agent and preparation method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication