CN113082980B - Normal-temperature waste gas desulfurization and denitrification process control system and application method thereof - Google Patents

Normal-temperature waste gas desulfurization and denitrification process control system and application method thereof Download PDF

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CN113082980B
CN113082980B CN202110399631.5A CN202110399631A CN113082980B CN 113082980 B CN113082980 B CN 113082980B CN 202110399631 A CN202110399631 A CN 202110399631A CN 113082980 B CN113082980 B CN 113082980B
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adsorption unit
waste gas
ozone
spray tower
adsorption
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CN113082980A (en
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吴兰兰
华绍广
任甲泽
吴将有
朱江丽
李刚
周伟
王锐
汪大亚
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Huawei National Engineering Research Center of High Efficient Cyclic and Utilization of Metallic Mineral Resources Co Ltd
Sinosteel Maanshan General Institute of Mining Research Co Ltd
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Sinosteel Maanshan Institute Of Mining Research Engineering Investigation And Design Co ltd
Huawei National Engineering Research Center of High Efficient Cyclic and Utilization of Metallic Mineral Resources Co Ltd
Sinosteel Maanshan General Institute of Mining Research Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—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
    • 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
    • B01D53/346—Controlling the 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur 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
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The invention discloses a normal-temperature waste gas desulfurization and denitrification process control system and a use method thereof, wherein the system comprises SO 2 The device comprises an adsorption unit, a desulfurization spray tower (4), a denitration spray tower (9), an oxidation box (10) and an air heating and ozone generating unit. SO (SO) 2 Adsorption unit from SO 2 First adsorption unit (3), SO 2 The second adsorption units (11) are connected in parallel; the air heating and ozone generating unit comprises an ozone generator (13) and a heating system (15); the outlet of the desulfurization spray tower (4) and the outlet of the denitration spray tower (9) are sequentially connected with a dehydrator (5), an ozonolysis unit (6) and NO X 、SO 2 An online monitoring system (7) and a chimney (8). The invention adopts SO 2 Adsorbing material to realize SO 2 And NO X Treated separately and H is realized 2 SO 4 And HNO 3 The recycling and utilization obviously increase the economic added value and can realize NO X Direct conversion to N 2 And (4) directly discharging.

Description

Normal-temperature waste gas desulfurization and denitrification process control system and application method thereof
Technical Field
The invention belongs to the technical field of industrial waste gas treatment, and particularly relates to a desulfurization and denitrification system for industrial waste gas and a use method thereof, which are particularly suitable for SO in normal-temperature waste gas of medium and small enterprises 2 And NO X The treatment of (1).
Background
Currently, SO emitted by industrial activities 2 And NO X Emissions are increasing with rapid economic growth, with concomitant rapid increases in nitrogen oxide emissions. NO (nitric oxide) X The nitrogen oxide fog discharged into the atmosphere can generate photochemical reaction under the irradiation of ultraviolet rays in sunlight to generate photochemical smog; SO (SO) 2 Acid rain is caused by the discharge into the air, and the two seriously harm the human health and the environment. For this country, some policy and regulation are set up to limit SO 2 And NO X And (4) discharging.
With the stricter environmental protection policies and regulations, large-scale power plants and steel mills have gradually responded to the ultra-low emission policy, and the removal technology is mature, but the operation cost is generally high. For example, chinese patent 201811331778.5 discloses a steel sintering flue gas desulfurization and denitration device, which comprises a flue gas conveying pipe, a dust remover connected with the flue gas conveying pipe, a heat exchanger connected with the dust remover, and a desulfurization and denitration tower connected with the heat exchanger. The steel sintering flue gas desulfurization and denitrification equipment is arranged on a desulfurization and denitrification towerThe denitration agent and the desulfurizer are arranged in the waste gas treatment system, SO that the desulfurization and denitration efficiency is difficult to accurately control, and the waste generated after desulfurization and denitration is difficult to comprehensively utilize, SO that the waste gas treatment system is not suitable for SO in normal-temperature waste gas of medium and small enterprises 2 And NO X The application in the treatment of (1).
SO of many small and medium-sized enterprises 2 And NO X The treatment methods are all oxidation liquid absorption, but the collected H 2 SO 4 And HNO 3 Only when the waste liquid is sent to a sewage treatment center for treatment. Meanwhile, previous researches have shown that ClO is generated although the efficiency is high when a strong oxidant of sodium chlorite is used 2 Secondary pollution and the like; if cheaper absorption liquids such as ammonium sulfite and pyrolusite pulp are used, the NO removal efficiency is low, generally 60-70%, and the industrial emission standard is difficult to achieve. In view of the above disadvantages, it is highly desirable to develop a high efficiency H 2 SO 4 Recyclable HNO 3 Recovery of or NO X Decomposition to N 2 And (4) a discharged process system control technology.
Disclosure of Invention
The invention aims to solve the problems that the existing industrial flue gas desulfurization and denitrification system has large investment, high operation cost and no SO in the flue gas 2 And NO X Comprehensively utilizes the waste and generates the secondary pollution of the waste, thereby providing a control system of the desulfurization and denitrification process of the normal-temperature waste gas, which can control the SO-containing gas discharged at normal temperature 2 And NO X The waste gas is purified, the ultralow emission is realized, the final standard emission is realized, and meanwhile, the H is realized 2 SO 4 Recyclable HNO 3 Recycle or NO X Decomposition to N 2 And (4) directly discharging.
The invention also aims to provide a use method of the normal-temperature waste gas desulfurization and denitrification process control system.
In order to achieve the above purpose of the present invention, the system for controlling the desulfurization and denitrification processes of normal temperature exhaust gas of the present invention adopts the following technical scheme:
the invention relates to a normal-temperature waste gas desulfurization and denitrification process control system, which comprises SO 2 Adsorption unit, desulfurization spray column, denitration spray column. The SO 2 Adsorption unit from SO 2 First adsorption unit, SO 2 The second adsorption units are connected in parallel and can also contain SO according to the flow of the waste gas source 2 Concentration of 3 or more SO 2 The adsorption units are connected in parallel; said SO 2 The first adsorption unit is provided with a waste gas inlet end, a hot air inlet end and an ozone inlet end, and the waste gas inlet end is provided with SO 2 The first adsorption unit adsorption air inlet valve and the first fan are connected with an exhaust gas source, and hot air and an ozone inlet end pass through SO 2 The first adsorption unit desorption air inlet valve is connected with the air heating and ozone generating unit; said SO 2 The second adsorption unit is also provided with a waste gas inlet end, a hot air inlet end and an ozone inlet end, and the waste gas inlet end passes through SO 2 The second adsorption unit is connected with an adsorption air inlet valve and a first fan to be connected with an exhaust gas source, and hot air and an ozone inlet end pass through SO 2 The second adsorption unit desorption air inlet valve is connected with the air heating and ozone generating unit; the SO 2 The first adsorption unit has two waste gas outlet ends, wherein one waste gas outlet end passes through SO 2 The first adsorption unit desorption gas outlet valve is connected with the desulfurization spray tower, and the other waste gas outlet end is connected with the desulfurization spray tower through SO 2 The first adsorption unit adsorption gas outlet valve is sequentially connected with the oxidation box and the denitration spray tower; the SO 2 The second adsorption unit also has two waste gas outlet ports, one of which passes SO 2 The desorption gas outlet valve of the second adsorption unit is connected with the desulfurization spray tower, and the other waste gas outlet end is connected with the desulfurization spray tower through SO 2 The second adsorption unit adsorption gas outlet valve is connected with the oxidation box and the denitration spray tower in sequence; the outlet of the desulfurization spray tower and the outlet of the denitration spray tower are sequentially connected with a dehydrator, an ozonolysis unit and NO X 、SO 2 An online monitoring system and a chimney.
Furthermore, the air heating and ozone generating unit comprises an ozone generator and a heating system; the inlet end of the ozone generator is connected with the second fan, and the outlet end of the ozone generator passes through SO 2 The ozone inlet valve of the oxidation pipeline is respectively connected with the SO 2 First adsorption unit desorption air inlet valve and SO 2 The second adsorption unit is connected with a desorption air inlet valve, and the outlet end of the ozone generator is also connected with a desorption air inlet valve through NO X The oxidation pipeline ozone inlet valve is connected with the oxidation box; heating is carried outThe inlet end of the system is connected with a third fan, and the outlet end of the heating system is respectively connected with the SO 2 First adsorption unit desorption air inlet valve and SO 2 The second adsorption unit desorption air inlet valve is connected.
Generally, a pipeline of the first fan connected to the waste gas source is further provided with a pre-dust removal device, and the pre-dust removal device can adopt a bag-type dust remover or other types of dust removers according to the dust-containing property of the waste gas.
In order to improve the intelligent control level of the normal-temperature waste gas desulfurization and denitrification process control system, the system is also provided with a PLC control system, wherein the PLC control system is associated with the first fan, the desulfurization spray tower, the ozonolysis unit, the denitrification spray tower, the second fan, the ozone generator, the third fan, the heating system, the air inlet valves and the air outlet valves, and is used for analyzing, processing and controlling the state data of the desulfurization and denitrification process control system in operation.
The SO 2 The adsorbing material in the adsorption unit is SO 2 Molecular sieve and gamma-Al special for adsorption 2 O 3 Honeycomb blocks or resin adsorbents.
Preferably, the adsorbent material can be SO on a support of round granular, cylindrical granular, honeycomb block or honeycomb shaped 2 And (4) coating the adsorption material.
The absorption liquid adopted by the desulfurization spray tower is NaOH and Na 2 SO 3 Mixed solution of (2), ca (OH) 2 With CaSO 3 Mixed solution or low concentration H of 2 SO 4 And (3) solution. When using low concentrations of H 2 SO 4 When the solution is prepared, the mass concentration of the solution is 15-45%.
The absorption liquid or decomposition liquid adopted by the denitration spray tower is NaOH and Na 2 SO 3 Mixed solution of (2), ca (OH) 2 With CaSO 3 Mixed solution of (1), low concentration HNO 3 Solution, NH 3 A solution or a urea solution. When using low concentration HNO 3 When the solution is used, the mass concentration of the solution is 10-40%.
The invention also discloses a use method of the desulfurization and denitrification process control system for normal-temperature waste gas.
The method comprises the following steps: adding NO X Conversion to HNO 3 Is carried out by the following steps
1)SO 2 First adsorption unit SO 2 、NO X Separation stage
Start-up denitration spray tower, NO X Oxidizing an ozone inlet valve of the pipeline, a second fan and an ozone generator to finish NO X Preparing an oxidation absorption system; the ozone generator adopts an ultraviolet photolysis ozone generator, and the absorption liquid of the denitration spray tower is low-concentration HNO 3 Solution, HNO 3 The mass concentration range of the solution is 10-40%; after the preparation work is finished, the first fan is started, the waste gas source is pretreated by the preposed dust removal device, and the pretreated waste gas is subjected to SO opened 2 The first adsorption unit adsorbs the air inlet valve and sends SO 2 The first adsorption unit removes SO contained in the exhaust gas 2 The adsorbent of the adsorption unit adopts cylindrical SO 2 A special adsorption material; containing NO X In the exhaust gas of (3) via SO 2 The first adsorption unit adsorption air outlet valve is sent into the oxidation box and mixed with ozone generated by a pre-started ozone generator for pre-oxidation, the oxidized waste gas enters a pre-started denitration spray tower for purification, and the purified waste gas reaching the standard passes through a dehydrator, an ozone decomposition unit and NO X 、SO 2 And the online monitoring system and the chimney are discharged into the atmosphere.
In this step, SO 2 First adsorption unit desorption gas outlet valve and SO 2 The second adsorption unit adsorbs the air inlet valve and the SO 2 The second adsorption unit adsorbs the gas outlet valve and SO 2 Ozone inlet valve and SO of oxidation pipeline 2 The first desorption unit desorption air inlet valve is in a closed state.
2)SO 2 Second adsorption Unit SO 2 、NO X Separation stage
When NO is present X 、SO 2 Online monitoring system display SO 2 After the set value is exceeded, the SO is closed 2 The first adsorption unit adsorbs the air inlet valve and the SO 2 The first adsorption unit adsorbs the gas outlet valve, start SO 2 The second adsorption unit adsorbs the air inlet valve and SO 2 The second adsorption unit adsorbs the gas outlet valve, the waste gas source is pretreated by the preposed dust removal device, and the pretreated waste gas is subjected to opened SO 2 The second adsorption unit adsorbs the air inlet valve and sends SO 2 The second adsorption unit removes SO contained in the exhaust gas 2 Containing NO X Is passed through SO 2 The second adsorption unit adsorbs the air outlet valve and sends into the oxidation box, mixes with the ozone that the ozone generator that has started in advance produces, carries out pre-oxidation, and the waste gas after the oxidation gets into the denitration spray column that has started in advance and purifies, purifies waste gas after reaching standard and passes through dehydrator, ozonolysis unit and NO X 、SO 2 The online monitoring system and the chimney are discharged into the atmosphere;
at this stage, SO 2 The first adsorption unit adsorbs the air inlet valve and SO 2 The first adsorption unit adsorbs the gas outlet valve, SO 2 The desorption air outlet valve of the second adsorption unit is in a closed state.
3)SO 2 The first adsorption unit is oxidized and desorbed:
and (3) an oxidation stage: first, SO is turned off 2 The first adsorption unit adsorbs the air inlet valve and the SO 2 The first adsorption unit adsorbs the air outlet valve, opens the desulfurization spray tower, SO in proper order 2 First adsorption unit desorption air inlet valve and SO 2 First adsorption unit desorption gas outlet valve and SO 2 Ozone inlet valve of oxidation pipeline and O generated by ozone generation system 3 Into SO 2 First adsorption unit of SO 2 SO adsorbed in the first adsorption unit adsorbent 2 By oxidation to SO 3 The oxidation time is controlled to be 5-20 min; then sequentially enters a desulfurization spray tower, a dehydrator, an ozonolysis unit and NO X 、SO 2 The waste gas purified to reach the standard is finally discharged into the atmosphere by an online monitoring system and a chimney;
a desorption stage: when the oxidation stage in the step 3) is finished, SO is closed 2 Oxidizing an ozone inlet valve of the pipeline, starting a third fan and a heating system, controlling the desorption temperature to be 80-300 ℃, and controlling the desorption time to be 16-24 min; desorbed SO 3 The waste gas is purified by a desulfurizing spray tower, and the absorbing liquid of the desulfurizing spray tower is Ca (OH) 2 With CaSO 3 Mixed solution of (2)The purified waste gas reaching the standard is treated by a dehydrator, an ozonolysis unit and NO X 、SO 2 The online monitoring system and the chimney are discharged into the atmosphere;
at this stage, SO 2 The second adsorption unit adsorbs the air inlet valve and the SO 2 The second adsorption unit desorption air inlet valve is in a closed state.
4) After the above process has been run, NO X And SO 2 Respectively with HNO 3 Solution and CaSO 4 Is recovered in precipitated form, NO X 、SO 2 The treatment efficiency reaches more than 98.2 percent.
The method 2 comprises the following steps: adding NO X Conversion to N 2 The method comprises the following steps:
1)SO 2 first adsorption unit SO 2 、NO X Separation stage
Starting the denitration spray tower, the second fan and the ozone generator, and opening the ozone inlet valve of the NOx oxidation pipeline to finish NO X Preparing an oxidation absorption system; the ozone generator adopts a low-temperature plasma ozone generator, the absorption liquid of the denitration spray tower adopts a urea solution, and the mass concentration range is 10-90%; after the preparation work is finished, the first fan is started, the waste gas source is pretreated by the front dust removal device, and the pretreated waste gas is subjected to SO opening 2 The first adsorption unit adsorbs the air inlet valve and sends SO 2 The first adsorption unit (3) removes SO contained in the exhaust gas 2 Wherein the adsorbent of the adsorption unit is gamma-Al 2 O 3 A honeycomb block; containing NO X Is passed through SO 2 The first adsorption unit adsorbs the air outlet valve and sends into the oxidation box, mixes with ozone that the ozone generator that has started in advance produces, carries out pre-oxidation, and the waste gas after the oxidation gets into the denitration spray column that has started in advance and purifies, purifies waste gas after reaching standard and passes through dehydrator, ozone decomposition unit and NO X 、SO 2 The online monitoring system and the chimney are discharged into the atmosphere;
at this stage, SO 2 First adsorption unit desorption gas outlet valve and SO 2 The ozone inlet valve of the oxidation pipeline is in a closed state.
2)SO 2 Second adsorption unit) SO 2 、NO X Separation stage
When NO is present X 、SO 2 Online monitoring system display SO 2 After the set value is exceeded, the SO is closed 2 The first adsorption unit adsorbs the air inlet valve and SO 2 The first adsorption unit adsorbs the gas outlet valve and starts SO 2 The second adsorption unit adsorbs the air inlet valve and the SO 2 The second adsorption unit adsorbs the gas outlet valve, the waste gas source is pretreated by the preposed dust removal device, and the pretreated waste gas passes through the opened SO 2 The second adsorption unit adsorbs the air inlet valve to send SO 2 The second adsorption unit removes SO contained in the exhaust gas 2 Containing NO X In the exhaust gas of (3) via SO 2 The second adsorption unit adsorbs the air outlet valve and sends into the oxidation box, mixes with the ozone that ozone generator that starts in advance produced, carries out the pre-oxidation, and the waste gas after the oxidation gets into the denitration spray column that starts in advance and purifies, purifies waste gas after up to standard through dehydrator, ozonolysis unit and NO X 、SO 2 The online monitoring system and the chimney are discharged into the atmosphere;
at this stage, SO 2 The second adsorption unit desorbs the gas outlet valve and SO 2 The first adsorption unit adsorbs the air inlet valve and SO 2 The first adsorption unit adsorption gas outlet valve is in a closed state.
3)SO 2 The first adsorption unit is oxidized and desorbed:
an oxidation stage: first, SO is turned off 2 The first adsorption unit adsorbs the air inlet valve and the SO 2 The first adsorption unit adsorbs the air outlet valve, opens the desulfurization spray tower, SO in proper order 2 First adsorption unit desorption air inlet valve and SO 2 First adsorption unit desorption gas outlet valve and SO 2 Ozone inlet valve of oxidation pipeline and O generated by ozone generation system 3 Into SO 2 A first adsorption unit for SO 2 SO adsorbed in the first adsorption unit adsorbent 2 By oxidation to SO 3 The oxidation time is controlled to be 5-20 min; then sequentially enters a desulfurization spray tower, a dehydrator, an ozonolysis unit and NO X 、SO 2 The waste gas purified to reach the standard is finally discharged into the atmosphere by an online monitoring system and a chimney;
desorptionStage (2): when the oxidation stage in the step 3) is finished, closing the SO 2 Oxidizing an ozone inlet valve of the pipeline, starting a third fan and a heating system, controlling the desorption temperature to be 80-300 ℃, and controlling the desorption time to be 16-24 min; desorbed SO 3 The waste gas is purified by a desulfurization spray tower, and the absorption liquid of the desulfurization spray tower is NaOH and Na 2 SO 3 The purified waste gas reaching the standard is treated by a dehydrator, an ozonolysis unit and NO X 、SO 2 The online monitoring system and the chimney are discharged into the atmosphere;
at this stage, SO 2 The second adsorption unit adsorbs the air inlet valve and the SO 2 The second adsorption unit desorption air inlet valve is in a closed state.
4) After the above process has been run, NO X And SO 2 Are respectively expressed by N 2 Emission and Na 2 SO 4 Is recovered in solution, NO X 、SO 2 The treatment efficiency reaches more than 98.5 percent.
The control system and the use method of the desulfurization and denitrification process of the normal-temperature waste gas have the following positive effects after adopting the technical scheme:
1) The invention adopts SO 2 Adsorbing material to realize SO 2 And NO X Treated separately and H is realized 2 SO 4 And HNO 3 The recycling and utilization obviously increase the economic added value and can also realize NO X Direct conversion to N 2 And (4) directly discharging.
2) The invention obviously improves SO 2 And NO X The treatment efficiency of both can reach more than 98 percent at the same time.
3) The invention adopts multi-stage parallel SO 2 Adsorption unit pair SO 2 And NO X The waste gas realizes continuous treatment, and the operation efficiency of a factory is greatly improved.
4) The invention realizes the concentration of the desulfurization waste gas, and the treatment capacity of the required desulfurization spray tower facility is greatly reduced compared with the treatment capacity of the non-concentrated waste gas desulfurization spray tower facility, thereby greatly reducing the investment cost.
5) The invention analyzes and processes the state data of the device in operation through the PLC control system, realizes full-automatic control and greatly improves the operation efficiency of a process system.
Drawings
FIG. 1 is a schematic structural diagram of a control system for a normal temperature flue gas desulfurization and denitrification process.
The reference signs are: 1-a front dust removal device; 2-a first fan; 3-SO 2 A first adsorption unit; 4-a desulfurization spray tower; 5-a dehydrator; 6-an ozonolysis unit; 7-NO X 、SO 2 An online monitoring system; 8, a chimney; 9-a denitration spray tower; 10-an oxidation box; 11-SO 2 A second adsorption unit; 12-a second fan; 13-an ozone generator; 14-a third fan; 15-heating system.
A1-SO 2 A first adsorption unit adsorption intake valve; A2-SO 2 The first adsorption unit adsorbs the air outlet valve; A3-SO 2 A first adsorption unit desorption air inlet valve; A4-SO 2 The first adsorption unit desorbs the air outlet valve; B1-SO 2 The second adsorption unit adsorbs the air inlet valve; B2-SO 2 The second adsorption unit adsorbs the air outlet valve; B3-SO 2 The second adsorption unit desorbs the air inlet valve; B4-SO 2 The second adsorption unit desorbs the gas outlet valve; C1-NO X An ozone inlet valve of an oxidation pipeline; C2-SO 2 Oxidation pipeline ozone admission valve.
Detailed Description
In order to better describe the present invention, the following describes the system for controlling the desulfurization and denitration process of normal temperature exhaust gas and the method for using the same in detail with reference to the accompanying drawings.
As shown in FIG. 1, the system for controlling a process of desulfurization and denitration of normal temperature waste gas comprises SO 2 An adsorption unit, a desulfurization spray tower 4 and a denitration spray tower 9. The SO 2 Adsorption unit from SO 2 First adsorption Unit 3, SO 2 The second adsorption units 11 are connected in parallel; the SO 2 The first adsorption unit 3 is provided with a waste gas inlet end, a hot air inlet end and an ozone inlet end, and the waste gas inlet end passes through SO 2 The first adsorption unit adsorption air inlet valve A1 and the first fan 2 are connected to wasteAir source, hot air and ozone inlet end passing through SO 2 The first adsorption unit desorption air inlet valve A3 is connected with the air heating and ozone generating unit; the SO 2 The second adsorption unit 11 is also provided with a waste gas inlet end, a hot air inlet end and an ozone inlet end, wherein the waste gas inlet end is connected with a SO 2 The second adsorption unit adsorption air inlet valve B1 and the first fan 2 are connected with an exhaust gas source, and hot air and an ozone inlet end pass through SO 2 The second adsorption unit desorption air inlet valve B3 is connected with the air heating and ozone generating unit; the SO 2 The first adsorption unit 3 has two exhaust gas outlet ends, one of which passes SO 2 The first adsorption unit desorption gas outlet valve A4 is connected with the desulfurization spray tower 4, and the other waste gas outlet end is connected with the desulfurization spray tower 4 through SO 2 The first adsorption unit adsorption gas outlet valve A2 is sequentially connected with an oxidation box 10 and a denitration spray tower 9; the SO 2 The second adsorption unit 11 also has two waste gas outlet ports, one of which passes SO 2 The desorption gas outlet valve B4 of the second adsorption unit is connected with the desulfurization spray tower 4, and the other waste gas outlet end is connected with the desulfurization spray tower 4 through SO 2 The second adsorption unit adsorption gas outlet valve B2 is sequentially connected with the oxidation box 10 and the denitration spray tower 9; the outlet of the desulfurization spray tower 4 and the outlet of the denitration spray tower 9 are sequentially connected with a dehydrator 5, an ozonolysis unit 6 and NO X 、SO 2 An online monitoring system 7 and a chimney 8.
The air heating and ozone generating unit comprises an ozone generator 13 and a heating system 15; the inlet end of the ozone generator 13 is connected with the second fan 12, and the outlet end of the ozone generator 13 passes through SO 2 The ozone inlet valve C2 of the oxidation pipeline and the SO are respectively connected 2 First adsorption unit desorption air inlet valve A3 and SO 2 The desorption air inlet valve B3 of the second adsorption unit is connected, and the outlet end of the ozone generator 13 is also connected with the second adsorption unit through NO X The oxidation pipeline ozone air inlet valve C1 is connected with the oxidation box 10; the inlet end of the heating system 15 is connected with the third fan 14, and the outlet end of the heating system 15 is respectively connected with the SO 2 First adsorption unit desorption air inlet valve A3 and SO 2 The second adsorption unit desorption air inlet valve B3 is connected; a front dust removal device 1 is also arranged on a pipeline of the first fan 2 connected with the waste gas source.
The invention is also provided with a PLC control system, wherein the PLC control system is associated with the first fan 2, the desulfurization spray tower 4, the ozonolysis unit 6, the denitrification spray tower 9, the second fan 12, the ozone generator 13, the third fan 14, the heating system 15, each air inlet valve and each air outlet valve, and analyzes and controls the state data of the desulfurization and denitrification process control system in operation.
The SO 2 The adsorbing material in the adsorption unit is SO 2 Molecular sieve and gamma-Al special for adsorption 2 O 3 Or a resin adsorbent; the shape of the SO can be round granular, cylindrical granular, honeycomb block or the SO on a support body formed by honeycomb 2 And (4) coating the adsorption material.
The ozone generator 13 is an ultraviolet photolysis ozone generator or a low-temperature plasma ozone generator.
The catalyst required by the ozone decomposition unit 6 is a manganese dioxide high-concentration ozone catalyst.
The absorption liquid adopted by the desulfurization spray tower 4 is NaOH and Na 2 SO 3 Mixed solution of (2), ca (OH) 2 With CaSO 3 Or low concentration of H 2 SO 4 A solution; the absorption liquid or decomposition liquid adopted by the denitration spray tower 9 is NaOH and Na 2 SO 3 Mixed solution of (2), ca (OH) 2 With CaSO 3 Mixed solution of (1), low concentration HNO 3 Solution, NH 3 A solution or a urea solution.
The invention relates to a use method of a normal-temperature waste gas desulfurization and denitrification process control system, which is used for controlling NO X Conversion to N 2 The method comprises the following steps:
1)SO 2 first adsorption unit SO 2 、NO X Separation stage
Starting the denitration spray tower 9, the second fan 12 and the ozone generator 13, opening the ozone inlet valve C1 of the NOx oxidation pipeline to finish NO X Preparing an oxidation absorption system; the ozone generator adopts a low-temperature plasma ozone generator, and the absorption liquid of the denitration spray tower adopts a urea solution, wherein the mass concentration range is 10-90%; after the preparation is finished, the SO is closed in sequence 2 First adsorption unitDesorption air inlet valve A3, SO 2 First adsorption unit desorption air outlet valve A4 and SO 2 Ozone inlet valve C2, SO of oxidation pipeline 2 The second adsorption unit adsorbs the air inlet valves B1 and SO 2 The second adsorption unit adsorbs an air outlet valve B2, a first fan 2 is started, a waste gas source is pretreated by a preposed dust removal device 1, and the pretreated waste gas is subjected to SO (sulfur oxide) treatment by opened SO 2 The first adsorption unit adsorbs the air inlet valve A1 to send SO 2 The first adsorption unit 3 removes SO contained in the exhaust gas 2 Wherein the adsorbent of the adsorption unit is gamma-Al 2 O 3 A honeycomb block; containing NO X Is passed through SO 2 The first adsorption unit adsorption gas outlet valve A2 is sent into an oxidation box 10 to be mixed with ozone generated by a pre-started ozone generator 13 for pre-oxidation, the oxidized waste gas enters a pre-started denitration spray tower 9 for purification, and the purified waste gas reaching the standard passes through a dehydrator 5, an ozone decomposition unit 6 and NO X 、SO 2 The online monitoring system 7 and the chimney 8 are discharged into the atmosphere;
2)SO 2 second adsorption Unit SO 2 、NO X Separation stage
When NO is present X 、SO 2 On-line monitoring system 7 displays SO 2 After the set value is exceeded, the SO is closed 2 The first adsorption unit adsorbs the air inlet valves A1 and SO 2 The first adsorption unit adsorbs the gas outlet valve A2 and SO 2 The second adsorption unit desorbs the air inlet valves B3 and SO 2 The second adsorption unit desorbs the gas outlet valve B4, and starts SO 2 The second adsorption unit adsorbs the air inlet valves B1 and SO 2 The second adsorption unit adsorbs an air outlet valve B2, a waste gas source is pretreated by the preposed dust removal device 1, and the pretreated waste gas is subjected to opened SO 2 The second adsorption unit adsorbs the air inlet valve B1 to send SO 2 The second adsorption unit 11 removes SO contained in the exhaust gas 2 Containing NO X Is passed through SO 2 The second adsorption unit adsorption gas outlet valve B2 is sent into an oxidation box 10 to be mixed with ozone generated by a pre-started ozone generator 13 for pre-oxidation, the oxidized waste gas enters a pre-started denitration spray tower 9 for purification, and the purified waste gas reaching the standard passes through a dehydrator 5, an ozone decomposition unit 6 and an NO (nitric oxide) unit X 、SO 2 The online monitoring system 7 and the chimney 8 are discharged into the atmosphere;
3)SO 2 the first adsorption unit is oxidized and desorbed:
an oxidation stage: first, SO is turned off 2 The first adsorption unit adsorbs the air inlet valves A1 and SO 2 The first adsorption unit adsorbs the gas outlet valve A2, SO 2 The second adsorption unit desorbs the air inlet valves B3 and SO 2 The desorption gas outlet valve B4 of the second adsorption unit is opened in sequence, and the desulfurization spray tower 4 and the SO are opened 2 First adsorption unit desorption air inlet valve A3 and SO 2 First adsorption unit desorption air outlet valve A4 and SO 2 Oxidation pipeline ozone inlet valve C2, O produced by ozone generating system 3 Into SO 2 First adsorption unit 3, SO 2 SO adsorbed in the adsorbent of the first adsorption unit 3 2 Is oxidized to SO 3 The oxidation time is controlled to be 5-20 min; then enters a desulfurization spray tower 4, a dehydrator 5, an ozonolysis unit 6 and NO in sequence X 、SO 2 The online monitoring system 7 and the chimney 8 are used for finally discharging the purified waste gas reaching the standard into the atmosphere;
a desorption stage: when the oxidation stage in the step 3) is finished, closing the SO 2 Oxidizing an ozone inlet valve C2 of the pipeline, starting a third fan 14 and a heating system 15, controlling the desorption temperature to be 80-300 ℃, and controlling the desorption time to be 16-24 min; desorbed SO 3 The waste gas is purified by a desulfurizing spray tower 4, and the absorption liquid of the desulfurizing spray tower is NaOH and Na 2 SO 3 The purified waste gas reaching the standard is treated by a dehydrator 5, an ozonolysis unit 6 and NO X 、SO 2 The online monitoring system 7 and the chimney 8 are discharged into the atmosphere;
4) After the above process has been run, NO X And SO 2 Are respectively provided with N 2 Emission and Na 2 SO 4 Is recovered in solution, NO X 、SO 2 The treatment efficiency reaches more than 98.5 percent.
The invention relates to a use method of a normal-temperature waste gas desulfurization and denitrification process control system, which is used for controlling NO X Conversion to N 2 The method comprises the following steps:
1)SO 2 first adsorption unit SO 2 、NO X Separation stage
Starting the denitration spray tower 9, the second fan 12 and the ozone generator 13, and opening the ozone inlet valve C1 of the NOx oxidation pipeline to finish NO X Preparing an oxidation absorption system; the ozone generator adopts a low-temperature plasma ozone generator, the absorption liquid of the denitration spray tower adopts a urea solution, and the mass concentration range is 10-90%; after the preparation work is finished, the first fan 2 is started, the waste gas source is pretreated by the preposed dust removal device 1, and the pretreated waste gas is subjected to SO (SO) opening 2 The first adsorption unit adsorbs the air inlet valve A1 to send SO 2 The first adsorption unit 3 removes SO contained in the exhaust gas 2 Wherein the adsorbent of the adsorption unit is gamma-Al 2 O 3 A honeycomb block; containing NO X Is passed through SO 2 The first adsorption unit adsorption gas outlet valve A2 is sent into an oxidation box 10 to be mixed with ozone generated by a pre-started ozone generator 13 for pre-oxidation, the oxidized waste gas enters a pre-started denitration spray tower 9 for purification, and the purified waste gas reaching the standard passes through a dehydrator 5, an ozone decomposition unit 6 and NO X 、SO 2 The online monitoring system 7 and the chimney 8 are discharged into the atmosphere;
2)SO 2 second adsorption Unit SO 2 、NO X Separation stage
When NO is present X 、SO 2 On-line monitoring system 7 displays SO 2 After the set value is exceeded, the SO is closed 2 The first adsorption unit adsorbs the air inlet valves A1 and SO 2 The first adsorption unit adsorbs the gas outlet valve A2, and SO is started 2 The second adsorption unit adsorbs the air inlet valves B1 and SO 2 The second adsorption unit adsorbs the gas outlet valve B2, the waste gas source is pretreated by the preposed dust removal device 1, and the pretreated waste gas passes through the opened SO 2 The second adsorption unit adsorbs the air inlet valve B1 to send SO 2 The second adsorption unit 11 removes SO contained in the exhaust gas 2 Containing NO X In the exhaust gas of (3) via SO 2 The second adsorption unit adsorbs the air outlet valve B2 and sends into the oxidation box 10, mixes with the ozone that ozone generator 13 that has started in advance produces, carries out the pre-oxidation, and the waste gas after the oxidation gets into the denitration spray tower 9 that has started in advance and purifies, purifies waste gas after reaching standard through the dewateringVessel 5, ozonolysis unit 6 and NO X 、SO 2 The online monitoring system 7 and the chimney (8) are discharged into the atmosphere;
3)SO 2 the first adsorption unit is in an oxidation and desorption stage:
an oxidation stage: first, SO is turned off 2 The first adsorption unit adsorbs the air inlet valves A1 and SO 2 The first adsorption unit adsorbs the air outlet valve A2, and the desulfurization spray tower 4 and the SO are sequentially started 2 First adsorption unit desorption air inlet valve A3 and SO 2 First adsorption unit desorption air outlet valve A4 and SO 2 Oxidation pipeline ozone inlet valve C2, O produced by ozone generating system 3 Into SO 2 First adsorption unit 3, SO 2 SO adsorbed in the adsorbent of the first adsorption unit 3 2 By oxidation to SO 3 The oxidation time is controlled to be 5-20 min; then enters a desulfurization spray tower 4, a dehydrator 5, an ozonolysis unit 6 and NO in sequence X 、SO 2 An online monitoring system 7 and a chimney 8 are used for purifying the waste gas reaching the standard and finally discharging the purified waste gas into the atmosphere;
a desorption stage: when the oxidation stage in the step 3) is finished, SO is closed 2 Oxidizing an ozone inlet valve C2 of the pipeline, starting a third fan 14 and a heating system 15, controlling the desorption temperature to be 80-300 ℃, and controlling the desorption time to be 16-24 min; desorbed SO 3 The waste gas is purified by a desulfurization spray tower 4, and the absorption liquid of the desulfurization spray tower is NaOH and Na 2 SO 3 The purified waste gas reaching the standard is treated by a dehydrator 5, an ozonolysis unit 6 and NO X 、SO 2 The online monitoring system 7 and the chimney 8 are discharged into the atmosphere;
4) After the above process has been run, NO X And SO 2 Are respectively provided with N 2 Emission and Na 2 SO 4 Is recovered in solution form, NO X 、SO 2 The treatment efficiency reaches more than 98.5 percent.

Claims (2)

1. A use method of a normal-temperature waste gas desulfurization and denitrification process control system is characterized by comprising the following steps:
the normal temperature waste gas desulfurization and denitrification process control system comprises SO 2 Adsorption unit and desulfurization sprayA spray tower (4) and a denitration spray tower (9); the SO 2 Adsorption unit from SO 2 First adsorption unit (3), SO 2 The second adsorption units (11) are connected in parallel; said SO 2 The first adsorption unit (3) is provided with a waste gas inlet end, a hot air inlet end and an ozone inlet end, and the waste gas inlet end is communicated with the hot air inlet end and the ozone inlet end through SO 2 The first adsorption unit adsorption air inlet valve (A1) and the first fan (2) are connected with an exhaust gas source, and the inlet ends of hot air and ozone pass through SO 2 The first adsorption unit desorption air inlet valve (A3) is connected with the air heating and ozone generating unit; said SO 2 The second adsorption unit (11) is also provided with a waste gas inlet end, a hot air inlet end and an ozone inlet end, and the waste gas inlet end is connected with the hot air inlet end and the ozone inlet end through SO 2 The second adsorption unit adsorption air inlet valve (B1) and the first fan (2) are connected with an exhaust gas source, and hot air and an ozone inlet end pass through SO 2 A desorption air inlet valve (B3) of the second adsorption unit is connected with the air heating and ozone generating unit; said SO 2 The first adsorption unit (3) has two waste gas outlet ends, wherein one waste gas outlet end passes through SO 2 The first adsorption unit desorption gas outlet valve (A4) is connected with the desulfurization spray tower (4), and the other waste gas outlet end is connected with the desulfurization spray tower (4) through SO 2 The first adsorption unit adsorption gas outlet valve (A2) is sequentially connected with the oxidation box (10) and the denitration spray tower (9); said SO 2 The second adsorption unit (11) also has two waste gas outlet ports, one of which is passed over SO 2 The desorption gas outlet valve (B4) of the second adsorption unit is connected with the desulfurization spray tower (4), and the other waste gas outlet end passes through SO 2 The second adsorption unit adsorption gas outlet valve (B2) is connected with the oxidation box (10) and the denitration spray tower (9) in sequence; the outlet of the desulfurization spray tower (4) and the outlet of the denitration spray tower (9) are sequentially connected with a dehydrator (5), an ozonolysis unit (6) and NO X 、SO 2 An online monitoring system (7) and a chimney (8); the air heating and ozone generating unit comprises an ozone generator (13) and a heating system (15); the inlet end of the ozone generator (13) is connected with the second fan (12), and the outlet end of the ozone generator (13) passes through SO 2 An ozone inlet valve (C2) of the oxidation pipeline is respectively connected with the SO 2 The first adsorption unit desorbs the air inlet valve (A3) and the SO 2 The desorption air inlet valve (B3) of the second adsorption unit is connected, and the outlet end of the ozone generator (13) is also connected with the second adsorption unit through NO X An ozone inlet valve (C1) of the oxidation pipeline is connected with the oxidation box (10); the inlet end of the heating system (15) is connected with the third fan (14), and the outlet end of the heating system (15) is respectively connected with the SO 2 The first adsorption unit desorbs the air inlet valve (A3) and the SO 2 The second adsorption unit desorption air inlet valve (B3) is connected; a preposed dust removal device (1) is also arranged on a pipeline of the first fan (2) connected with the waste gas source; the system is also provided with a PLC control system, wherein the PLC control system is associated with the first fan (2), the desulfurization spray tower (4), the ozonolysis unit (6), the denitration spray tower (9), the second fan (12), the ozone generator (13), the third fan (14), the heating system (15), each air inlet valve and each air outlet valve, and is used for analyzing, processing and controlling the state data of the desulfurization and denitration process control system in operation;
NO is reduced X Conversion to HNO 3 The method comprises the following steps:
1）SO 2 first adsorption unit (3) SO 2 、NO X Separation stage
Opening of NO X An ozone inlet valve (C1) of an oxidation pipeline, a start denitration spray tower (9), a second fan (12) and an ozone generator (13) to finish NO X Preparing an oxidation absorption system; the ozone generator (13) adopts an ultraviolet photolysis ozone generator, and the absorption liquid of the denitration spray tower is low-concentration HNO 3 Solution, HNO 3 The mass concentration range of the solution is 10-40%; after the preparation work is finished, the first fan (2) is started, the waste gas source is pretreated by the preposed dust removal device (1), and the pretreated waste gas is subjected to SO (SO) opening 2 The first adsorption unit adsorbs the air inlet valve (A1) and sends SO 2 The first adsorption unit (3) removes SO contained in the exhaust gas 2 The adsorbent of the adsorption unit adopts cylindrical SO 2 A special adsorption material; containing NO X Is passed through SO 2 The first adsorption unit adsorption gas outlet valve (A2) is sent into the oxidation box (10) to react with the pre-started ozoneOzone generated by the generator (13) is mixed and pre-oxidized, the oxidized waste gas enters the pre-started denitration spray tower (9) for purification, and the purified waste gas reaching the standard passes through the dehydrator (5), the ozonolysis unit (6) and NO X 、SO 2 The online monitoring system (7) and the chimney (8) are discharged into the atmosphere;
2）SO 2 second adsorption Unit (11) SO 2 、NO X Separation stage
When NO is present X 、SO 2 The online monitoring system (7) displays SO 2 After the set value is exceeded, the SO is closed 2 The first adsorption unit adsorbs the air inlet valve (A1) and the SO 2 The first adsorption unit adsorbs the gas outlet valve (A2), and SO is started 2 The second adsorption unit adsorbs the air inlet valve (B1) and SO 2 The second adsorption unit adsorbs an air outlet valve (B2), a waste gas source is pretreated by the preposed dust removal device (1), and the pretreated waste gas passes through opened SO 2 The second adsorption unit adsorbs the air inlet valve (B1) and sends SO 2 A second adsorption unit (11) for removing SO contained in the exhaust gas 2 Containing NO X In the exhaust gas of (3) via SO 2 The second adsorption unit adsorbs the air outlet valve (B2) and sends into the oxidation box (10), mixes with the ozone that ozone generator (13) that has started in advance produced, carries out the pre-oxidation, and the waste gas after the oxidation gets into denitration spray tower (9) that has started in advance and purifies, purifies waste gas after reaching standard and passes through dehydrator (5), ozone decomposition unit (6) and NO X 、SO 2 The online monitoring system (7) and the chimney (8) are discharged into the atmosphere;
3）SO 2 the first adsorption unit (3) is in an oxidation and desorption stage:
an oxidation stage: first, SO is turned off 2 The first adsorption unit adsorbs the air inlet valve (A1) and SO 2 The first adsorption unit adsorbs the air outlet valve (A2), and the desulfurization spray tower (4) and the SO are sequentially opened 2 The first adsorption unit desorbs the air inlet valve (A3) and the SO 2 A first adsorption unit desorption gas outlet valve (A4) and SO 2 Oxidation pipeline ozone inlet valve (C2), O produced by ozone generating system 3 Into SO 2 A first adsorption unit (3) for SO 2 SO adsorbed in the adsorbent of the first adsorption unit (3) 2 Is oxidized to SO 3 The oxidation time is controlled to be 5-20 min; then sequentially enters a desulfurization spray tower (4), a dehydrator (5), an ozonolysis unit (6) and NO X 、SO 2 The online monitoring system (7) and the chimney (8) are used for purifying the waste gas reaching the standard and finally discharging the purified waste gas into the atmosphere;
a desorption stage: when the oxidation stage in the step 3) is finished, closing the SO 2 Oxidizing an ozone inlet valve (C2) of the pipeline, starting a third fan (14) and a heating system (15), controlling the desorption temperature to be 80-300 ℃, and controlling the desorption time to be 16-24 min; desorbed SO 3 The waste gas is purified by a desulfurizing spray tower (4), and the absorption liquid of the desulfurizing spray tower is Ca (OH) 2 With CaSO 3 The purified waste gas reaching the standard is treated by a dehydrator (5), an ozone decomposition unit (6) and NO X 、SO 2 The online monitoring system (7) and the chimney (8) are discharged into the atmosphere;
4) After the above process has been run, NO X And SO 2 Respectively with HNO 3 Solution and CaSO 4 Is recovered in precipitated form, NO X 、SO 2 The treatment efficiency reaches more than 98.2 percent.
2. A use method of a normal-temperature waste gas desulfurization and denitrification process control system is characterized by comprising the following steps:
the normal temperature waste gas desulfurization and denitrification process control system comprises SO 2 The device comprises an adsorption unit, a desulfurization spray tower (4) and a denitration spray tower (9); the SO 2 Adsorption unit from SO 2 First adsorption unit (3), SO 2 The second adsorption units (11) are connected in parallel; the SO 2 The first adsorption unit (3) is provided with a waste gas inlet end, a hot air inlet end and an ozone inlet end, and the waste gas inlet end is communicated with the hot air inlet end and the ozone inlet end through SO 2 The first adsorption unit adsorption air inlet valve (A1) and the first fan (2) are connected with an exhaust gas source, and hot air and an ozone inlet end pass through SO 2 The first adsorption unit desorption air inlet valve (A3) is connected with the air heating and ozone generating unit; said SO 2 A second adsorption unit (11 Also provided with an exhaust gas inlet port, which passes SO, a hot air and ozone inlet port 2 The second adsorption unit adsorption air inlet valve (B1) and the first fan (2) are connected with an exhaust gas source, and the hot air and ozone inlet ends pass through SO 2 A desorption air inlet valve (B3) of the second adsorption unit is connected with the air heating and ozone generating unit; the SO 2 The first adsorption unit (3) has two waste gas outlet ends, wherein one waste gas outlet end passes through SO 2 The first adsorption unit desorption gas outlet valve (A4) is connected with the desulfurization spray tower (4), and the other waste gas outlet end is connected with the desulfurization spray tower (4) through SO 2 The first adsorption unit adsorption gas outlet valve (A2) is connected with the oxidation box (10) and the denitration spray tower (9) in sequence; the SO 2 The second adsorption unit (11) also has two waste gas outlet ports, one of which is passed over SO 2 The desorption gas outlet valve (B4) of the second adsorption unit is connected with the desulfurization spray tower (4), and the other waste gas outlet end passes through SO 2 The second adsorption unit adsorption gas outlet valve (B2) is sequentially connected with the oxidation box (10) and the denitration spray tower (9); the outlet of the desulfurization spray tower (4) and the outlet of the denitration spray tower (9) are sequentially connected with a dehydrator (5), an ozonolysis unit (6) and NO X 、SO 2 An online monitoring system (7) and a chimney (8); the air heating and ozone generating unit comprises an ozone generator (13) and a heating system (15); the inlet end of the ozone generator (13) is connected with the second fan (12), and the outlet end of the ozone generator (13) passes through SO 2 An ozone inlet valve (C2) of the oxidation pipeline is respectively connected with SO 2 The first adsorption unit desorbs the air inlet valve (A3) and the SO 2 The desorption air inlet valve (B3) of the second adsorption unit is connected, and the outlet end of the ozone generator (13) is also connected with the second adsorption unit through NO X The oxidation pipeline ozone inlet valve (C1) is connected with the oxidation box (10); the inlet end of the heating system (15) is connected with the third fan (14), and the outlet end of the heating system (15) is respectively connected with the SO 2 The first adsorption unit desorbs the air inlet valve (A3) and the SO 2 The second adsorption unit desorption air inlet valve (B3) is connected; a pipeline of the first fan (2) connected with the waste gas source is also provided with a preposed dust removal device (1); it is also provided with a PLC controlThe system comprises a PLC control system, a first fan (2), a desulfurization spray tower (4), an ozonolysis unit (6), a denitration spray tower (9), a second fan (12), an ozone generator (13), a third fan (14), a heating system (15), air inlet valves and air outlet valves, wherein the PLC control system is associated with the first fan, the second fan, the ozone generator, the third fan (14), the heating system (15), the air inlet valves and the air outlet valves and is used for analyzing, processing and controlling the state data of the desulfurization and denitration process control system in operation;
adding NO X Conversion to N 2 The method comprises the following steps:
1）SO 2 first adsorption unit (3) SO 2 、NO X Separation stage
Starting the denitration spray tower (9), the second fan (12) and the ozone generator (13), and opening the ozone inlet valve (C1) of the NOx oxidation pipeline to finish NO X Preparing an oxidation absorption system; the ozone generator adopts a low-temperature plasma ozone generator, the absorption liquid of the denitration spray tower adopts a urea solution, and the mass concentration range is 10-90%; after the preparation work is finished, the first fan (2) is started, the waste gas source is pretreated by the preposed dust removal device (1), and the pretreated waste gas is subjected to SO (SO) opening 2 The first adsorption unit adsorbs the air inlet valve (A1) and sends SO 2 The first adsorption unit (3) removes SO contained in the exhaust gas 2 Wherein the adsorbent of the adsorption unit is gamma-Al 2 O 3 A honeycomb block; containing NO X In the exhaust gas of (3) via SO 2 The first adsorption unit adsorption gas outlet valve (A2) is sent into an oxidation box (10) to be mixed with ozone generated by a pre-started ozone generator (13) for pre-oxidation, the oxidized waste gas enters a pre-started denitration spray tower (9) for purification, and the purified waste gas reaching the standard passes through a dehydrator (5), an ozone decomposition unit (6) and NO X 、SO 2 The online monitoring system (7) and the chimney (8) are discharged into the atmosphere;
2）SO 2 second adsorption Unit (11) SO 2 、NO X Separation stage
When NO is present X 、SO 2 The online monitoring system (7) displays SO 2 After the set value is exceeded, the SO is closed 2 First adsorption unit adsorption air intake valve: (A1）、SO 2 The first adsorption unit adsorbs the gas outlet valve (A2), and SO is started 2 The second adsorption unit adsorbs the air inlet valve (B1) and SO 2 The second adsorption unit adsorbs an air outlet valve (B2), a waste gas source is pretreated by a preposed dust removal device (1), and the pretreated waste gas passes through opened SO 2 The second adsorption unit adsorbs the air inlet valve (B1) and sends SO 2 A second adsorption unit (11) for removing SO contained in the exhaust gas 2 Containing NO X Is passed through SO 2 The second adsorption unit adsorbs air outlet valve (B2) and sends into oxidation box (10), mixes with the ozone that ozone generator (13) that has started in advance produced, carries out the pre-oxidation, and the waste gas after the oxidation gets into denitration spray column (9) that have started in advance and purifies, purifies waste gas after reaching standard and passes through dehydrator (5), ozone decomposition unit (6) and NO and pass through X 、SO 2 The online monitoring system (7) and the chimney (8) are discharged into the atmosphere;
3）SO 2 the first adsorption unit (3) is in an oxidation and desorption stage:
an oxidation stage: first, SO is turned off 2 The first adsorption unit adsorbs the air inlet valve (A1) and the SO 2 The first adsorption unit adsorbs the air outlet valve (A2), and the desulfurization spray tower (4) and the SO are sequentially opened 2 The first adsorption unit desorbs the air inlet valve (A3) and the SO 2 A first adsorption unit desorption gas outlet valve (A4) and SO 2 An ozone inlet valve (C2) of an oxidation pipeline and O generated by an ozone generation system 3 Into SO 2 A first adsorption unit (3) for SO 2 SO adsorbed in the adsorbent of the first adsorption unit (3) 2 Is oxidized to SO 3 The oxidation time is controlled to be 5-20 min; then enters a desulfurization spray tower (4), a dehydrator (5), an ozone decomposition unit (6) and NO in sequence X 、SO 2 The online monitoring system (7) and the chimney (8) are used for purifying the waste gas reaching the standard and finally discharging the purified waste gas into the atmosphere;
a desorption stage: when the oxidation stage in the step 3) is finished, SO is closed 2 An ozone inlet valve (C2) of the oxidation pipeline is started, a third fan (14) and a heating system (15) are started, the desorption temperature is controlled between 80 and 300 ℃, and the desorption time is controlled between 16 and 24min(ii) a Desorbed SO 3 The waste gas is purified by a desulfurization spray tower (4), and the absorption liquid of the desulfurization spray tower is NaOH and Na 2 SO 3 The purified waste gas reaching the standard passes through a dehydrator (5), an ozonolysis unit (6) and NO X 、SO 2 The online monitoring system (7) and the chimney (8) are discharged into the atmosphere;
4) After the above process has been run, NO X And SO 2 Are respectively expressed by N 2 Emission and Na 2 SO 4 Is recovered in solution form, NO X 、SO 2 The treatment efficiency reaches more than 98.5 percent.
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Patentee before: HUAWEI METAL MINERAL RESOURCE EFFICIENT RECYCLING UTILIZATION NATIONAL ENGINEERING RESEARCH CENTER Co.,Ltd.

Patentee before: SINOSTEEL MAANSHAN INSTITUTE OF MINING RESEARCH, ENGINEERING INVESTIGATION AND DESIGN Co.,Ltd.

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