CN113559688A - Flue gas desulfurization and denitrification integrated device and method - Google Patents

Flue gas desulfurization and denitrification integrated device and method Download PDF

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Publication number
CN113559688A
CN113559688A CN202110940251.8A CN202110940251A CN113559688A CN 113559688 A CN113559688 A CN 113559688A CN 202110940251 A CN202110940251 A CN 202110940251A CN 113559688 A CN113559688 A CN 113559688A
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CN
China
Prior art keywords
flue gas
desulfurization
denitrification
oxidant
dust remover
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CN202110940251.8A
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Chinese (zh)
Inventor
陈宜华
钟华
梁明
贾勇
郭丽娜
陈思
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Anhui Tianshun Environmental Protection Equipment Co ltd
Anhui University of Technology AHUT
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Anhui Tianshun Environmental Protection Equipment Co ltd
Anhui University of Technology AHUT
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Priority to CN202110940251.8A priority Critical patent/CN113559688A/en
Publication of CN113559688A publication Critical patent/CN113559688A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/60Simultaneously removing sulfur oxides and nitrogen oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/81Solid phase processes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/10Oxidants
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/02Other waste gases
    • B01D2258/0283Flue gases

Abstract

The invention discloses a flue gas desulfurization and denitrification integrated device and method, and belongs to the technical field of flue gas treatment. The device comprises a medicament tank, a water tank and a water tank, wherein the medicament tank is used for storing an oxidant for desulfurization and denitrification; the reagent mixing pipe is connected with the reagent tank, is provided with a flue gas inlet and is used for mixing flue gas with an oxidant for desulfurization and denitrification; the tubular reactor is used for carrying out oxidation reaction on the oxidant introduced into the medicament mixing pipe and the flue gas mixture; the dust remover is used for removing dust from the tail gas after the reaction in the tubular reactor; and the chimney is connected with the dust remover through a fan and is used for discharging tail gas dedusted by the dust remover. The integrated device for flue gas desulfurization and denitration has the advantages of relatively small volume, stable operation, easy collection and treatment of reaction waste, effective adaptation to treatment of sintering flue gas and relatively high removal efficiency. The method adopts the flue gas desulfurization and denitrification integrated device to realize one-time desulfurization and denitrification treatment of the flue gas generated by the metallurgical sintering process.

Description

Flue gas desulfurization and denitrification integrated device and method
Technical Field
The invention belongs to the technical field of flue gas treatment, relates to metallurgical flue gas desulfurization and denitrification treatment equipment and process, and particularly relates to a flue gas desulfurization and denitrification integrated device and method.
Background
In recent years, with the rapid development of the basic industry of China, the yield of steel becomes the largest country in the world, and the yield of crude steel accounts for about 51 percent of the world yield in 2018. A great deal of air pollutants, such as SO, can be discharged in the steel production process2、NOXDust particles, and the like. The main problems caused by dust particle pollution include equipment damage, reduction of working efficiency, pollution of working environment, harm to health and the like, wherein when respiratory dust particles with the particle size of less than 10 mu m are inhaled into the lung of a human body, a series of health problems such as toxic pneumonia or silicosis and even canceration of lung organs can be caused; SO discharged into the atmosphere2Is an indirect greenhouse gas causing greenhouse effect, and the acid rain and the greenhouse effect both generate great damage to soil, crops, forests, lakes, buildings and the like. SO (SO)2、NOXAcid rain and soil acidification can be formed, damage to the ecological environment and damage to tissue and organs, such as lung, cardiovascular, brain and nerve tissues, liver and kidney and reproductive organs, can be caused. Atmospheric pollution becomes an unavoidable reality in the life of urban residents in China, and SO2、NOXParticulate matter or dust pollution is an important factor influencing the quality of the atmospheric environment and is also the key point of atmospheric pollutant control.
Sintering is a necessary link for raw material preparation before smelting, and the exhaust gas is an important atmospheric pollution source. The sintering flue gas is waste gas generated in the process of high-temperature sintering and forming after the sintering mixture is ignited and runs along with the trolley. The sintering flue gas has various harmful gasesContaining a large amount of dust and SO2、NOX、CO、CO2And polycyclic aromatic hydrocarbons and the like. The generation amount of dust in the sintering flue gas accounts for more than 40 percent of the total production amount of pollutants in the steel industry; SO (SO)2、NOXThe discharge amount accounts for 40-60% of the total discharge amount of the steel industry.
The sintering flue gas has the main characteristics that:
(1) the sintering dust has various characteristics, such as light specific gravity, fine granularity, high temperature, high humidity and high concentration;
(2) the smoke discharge amount is large, and the annual operation rate of the sintering machine is up to more than 90%;
(3) the fluctuation of the flue gas temperature is large, and changes along with the condition of the sintering process, and the fluctuation range of the flue gas temperature is about 100-200 ℃;
(4) the flue gas contains corrosive and toxic gases and SO2、NOXAcid gases such as HCl and HF.
In order to control the pollution of sintering flue gas emission to the atmospheric environment, the main pollutants (dust and SO) in the flue gas are purified2、 NOX) Is a key point, and at present, the prior treatment technology mainly comprises the following steps: (1) the dust is filtered by a bag type dust collector, a wet type high-efficiency dust collector and the like. The bag type dust collector has the characteristics of high efficiency, strong dust adaptability, large air handling capacity and the like, is widely applied, and the filter bag which is suitable for sintering flue gas conditions is the key for dust collection to reach the standard. (2) The sintering flue gas contains a large amount of SO2, and the control method comprises a wet method, a dry method and a semi-dry method. The wet desulphurization process mainly comprises a lime-gypsum method and an ammonia method, the corresponding desulphurization efficiency reaches 95.0 percent, but the subsequent treatment of gypsum and wastewater becomes a difficult problem. The dry method mainly comprises spraying calcium in a furnace or a pipeline, circulating fluidized bed, CaO and other alkaline substances as desulfurizer, and reacting with SO in flue gas2Reaction for production of CaSO3/CaSO4. The semidry method mainly comprises a spray drying method and the like, and 80 to 90 percent of active CaO is sprayed in a drying tower to be mixed and reacted with flue gas to remove SO2. These dry desulfurization methods require a large amount of resources, and are not satisfactory in desulfurization effect and poor in equipment reliability. (3) Denitration method a Selective Catalytic Reduction (SCR) method using ammonia as a reducing agent,the removal rate of nitrogen oxides reaches 70.00%, the reaction temperature is 290-400 ℃, the reaction is carried out in sulfur-containing and dust flue gas, and the risk of sulfur poisoning exists; the method of non-catalytic reduction System (SNCR) is completed by urea or amino compound in a hearth or a flue at the opening of the hearth, the removal rate of nitrogen oxide reaches 80.00%, and the applicable temperature is 900-1100 ℃.
In conclusion, with the implementation of the pollutant emission requirements and environmental protection policies of the steel industry in China, new flue gas desulfurization and denitration technologies can be rapidly developed. However, the prior domestic sintering flue gas desulfurization and denitration technical device still has obvious problems of operation stability and suitability, and needs further verification. With the development of the environmental protection industry, the desulfurization and denitrification technology can improve the localization rate of equipment and promote the recycling of byproducts on the basis of reducing the related investment cost. Therefore, the device which is high in dust removal efficiency and stable in desulfurization and denitrification performance can meet the current environment-friendly emission requirement, and has important significance in realizing the blue sky engineering.
Disclosure of Invention
1. Problems to be solved
The invention provides a flue gas desulfurization and denitrification integrated device, which aims to overcome the defects of high operation stability, high difficulty in treating desulfurization and denitrification reaction wastes and wastewater and the like in the conventional sintering flue gas treatment desulfurization and denitrification technology. The integrated device for flue gas desulfurization and denitration has the advantages of relatively small volume, stable operation, easy collection and treatment of reaction wastes, effective adaptation to sintering flue gas treatment and relatively high removal efficiency.
The invention also provides a flue gas desulfurization and denitration method, which adopts the flue gas desulfurization and denitration integrated device to realize one-time desulfurization and denitration treatment of flue gas generated by the metallurgical sintering process.
2. Technical scheme
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the utility model provides a flue gas desulfurization denitration integrated device, includes:
the reagent tank is used for storing the oxidant for desulfurization and denitrification;
the reagent mixing pipe is connected with the reagent tank, is provided with a flue gas inlet and is used for mixing flue gas with an oxidant for desulfurization and denitrification;
the tubular reactor is used for carrying out oxidation reaction on the oxidant introduced into the medicament mixing pipe and the flue gas mixture;
the dust remover is used for removing dust from the tail gas after the reaction in the tubular reactor;
and the chimney is connected with the dust remover through a fan and is used for discharging tail gas dedusted by the dust remover.
The system further comprises a waste bin for receiving the solid materials treated by the tubular reactor and the dust remover; the waste bin conveys solid materials to the medicament tank through an air pump.
Further, the medicament tank conveys the oxidant into the medicament mixing pipe through a quantitative feeder.
Further, the system also comprises an industrial personal computer; a gas outlet of the dust remover is provided with a concentration sensor for detecting the concentration of harmful gas and/or dust in the tail gas; the industrial personal computer controls the feeding amount of the constant feeder by receiving signals of the concentration sensor.
Further, the dust remover comprises a cyclone dust remover and a bag filter, and the tubular reactor, the cyclone dust remover, the bag filter and the chimney are connected in sequence.
Furthermore, the tubular reactor, the cyclone dust collector and the bag filter are respectively connected with a waste bin through an ash discharger, a discharger and a material conveyor by pipelines.
The flue gas desulfurization and denitration method comprises the following steps of:
step A: adding an oxidant in the reagent tank into the reagent mixing pipe, and simultaneously introducing smoke, wherein the smoke and the oxidant are mixed in the reagent mixing pipe;
and B: introducing the flue gas mixed with the oxidant into a tubular reactor for reaction;
and C: and D, introducing the gas reacted in the step B into a dust remover for dust removal, and then discharging the gas through a chimney.
And further, recovering the solid materials treated in the step B and the step C, and conveying the solid materials into a medicament tank to be used as an oxidant for recycling.
And further, detecting the concentration of harmful gas and/or dust in the tail gas subjected to dust removal in the step C by using a concentration sensor, transmitting a signal to an industrial personal computer, and controlling the feeding amount of the medicament tank to the medicament mixing pipe by using the industrial personal computer.
Further, the oxidant is an oxide of Mn, and the particle size is 50-120 μm; the reaction temperature in step B is 150 ℃ and 180 ℃.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the integrated device for desulfurization and denitrification of flue gas, the oxidant for desulfurization and denitrification is fully mixed with the flue gas before reaction, and simultaneously the oxidant can be preheated, so that the flue gas can be fully and uniformly mixed in the tubular reactor, and the reaction is more sufficient; and the flue gas can be simultaneously subjected to desulfurization and denitrification treatment in the tubular reactor. The device has the advantages of relatively simple structure, short flow, simultaneous desulfurization and denitrification of the medicament, controllable reaction, multistage purification of the reactor and the filter material, high efficiency and wide application in the treatment of sintering flue gas in the steel industry.
(2) The invention relates to a flue gas desulfurization and denitration integrated device, wherein a plurality of parallel reactors are arranged in a tubular reactor, and the reaction time is prolonged according to the discharge concentration condition, SO that SO in flue gas2NOx is removed through full contact reaction; the gas flow uniform distribution plate in the tubular reactor is used for uniformly distributing the gas flow in the reactor, so that the gas flow is fully contacted and reacted with the medicament, and the reaction efficiency is improved.
(3) According to the integrated device for flue gas desulfurization and denitration, solid materials generated by the pipe type reactor and the dust remover are collected by the waste bin, the oxidant can be recycled, products which are not completely reacted can be recycled, and the utilization rate of waste materials is improved. Meanwhile, the influence of waste utilization on the flue gas reaction sufficiency is considered, the supply amount of the oxidant in the reagent tank is controlled by detecting the concentration of harmful gas and dust in the discharged tail gas, and the desulfurization and denitrification reaction is accurately controlled.
(4) According to the integrated device for desulfurization and denitrification of flue gas, the dust remover adopts the cyclone dust remover and the bag filter for two-stage dust removal, the cyclone dust remover is used as a preprocessor for collecting dust and desulfurization product particles carried in the flue gas, the concentration of the flue gas entering the bag dust remover is reduced, the load of the bag dust remover is reduced, and the service life of a filter bag is prolonged. The filter material of the bag type dust collector is formed by mixing, sintering and compounding polytetrafluoroethylene powder, MnOx powder and pore-forming agent according to a proportion, the air permeability is 15-30m3/m2.min, and the removal efficiency of dust and desulfurization product particles can reach more than 99.5 percent.
(5) In the method for desulfurizing and denitrating flue gas, the oxidant is mainly Mn oxide powder, the particle size is controlled to be 50-120 mu m, and the Mn oxide powder and SO in the flue gas2The NOx is mixed and reacted to generate manganese sulfate and manganese nitrate, the reaction temperature is controlled at 180 ℃, the reaction time and other conditions are controlled, and the desulfurization and denitrification efficiency can reach more than 80 percent.
Drawings
FIG. 1 is a schematic structural diagram of the integrated flue gas desulfurization and denitrification apparatus of the present invention.
In the figure: 1. a medicament canister; 2. a desulfurization and denitrification agent; 3. a screw feeder; 4. weighing; 5. a medicament mixing tube; 6. a tubular reactor; 7. a reaction mixing tube; 8. an air flow uniform distribution plate; 9. an ash discharging machine; 10. an air duct; 11. a cyclone dust collector; 12. a discharger; 13. a bag filter; 14. filtering the material; 15. an air flow distributor; 16. a material delivery machine; 17. a pneumatic conveying pipe; 18. a waste bin; 19. an air pump; 20. a pneumatic conveying pipe; 21. a concentration sensor; 22. an air duct; 23. a fan; 24. a chimney; 25. And an industrial personal computer.
Detailed Description
The invention is further described with reference to specific examples.
As shown in fig. 1, the integrated flue gas desulfurization and denitration device of the present embodiment is mainly composed of a chemical tank 1, a chemical mixing pipe 5, a tubular reactor 6, a dust remover, and a chimney 24. Wherein, the agent tank 1 is used for storing an oxidant for desulfurization and denitrification, namely a desulfurization and denitrification agent 2; the agent mixing pipe 5 is used for mixing the flue gas with an oxidant for desulfurization and denitrification; the tubular reactor 6 is used for carrying out oxidation reaction on the oxidant introduced into the medicament mixing pipe 5 and the flue gas mixture; the dust remover is used for removing dust from the tail gas after the reaction in the tubular reactor 6; and a chimney 24 for discharging the tail gas dedusted by the deduster. The detailed structure and connection relationship of the parts of the device will be described in detail below.
The agent mixing pipe 5 is a horizontally placed pipeline with a certain length, one end of the agent mixing pipe is provided with a smoke inlet, the other end of the agent mixing pipe is provided with a smoke outlet, smoke enters the pipe through the smoke inlet and is discharged out of the pipe through the smoke outlet. The medicine tank 1 is an oxidizer storage tank which is vertically set above the medicine mixing tube 5 and may be arranged in plurality in the tube axial direction of the medicine mixing tube 5. The outlet of the chemical tank 1 communicates with the inside of the chemical mixing tube 5, so that the oxidizing agent can be fed into the chemical mixing tube 5. Before entering the reactor 6, the flue gas and the oxidant are fully mixed in the reagent mixing pipe 5, and the flue gas can preheat the oxidant, so that the full reaction in the reactor 6 is improved, and the reaction efficiency is improved. In order to accurately control the supply amount of the oxidant, the outlet of the medicament tank 1 conveys the oxidant into the medicament mixing pipe 5 through a dosing machine, so that the feeding accuracy can be ensured, and a premise is provided for the subsequent waste recycling. In this embodiment, the constant feeder is composed of a screw feeder 3 and a weighing scale 4, the screw feeder 3 feeds, and the weighing scale 4 measures the feeding weight.
The tubular reactor 6 has a gas inlet on the lower side, a gas outlet on the top side and a solid waste outlet on the bottom. The gas inlet of the tubular reactor 6 is connected with the flue gas outlet of the medicament mixing pipe 5, so that flue gas enters the tubular reactor 6 after being discharged out of the medicament mixing pipe 5 and reacts in the tubular reactor 6. The reacted gas is discharged through a gas outlet of the tubular reactor 6, and the solid waste generated by the reaction is discharged from a solid waste outlet. 6 inside a plurality of reaction mixing tubes 7 that have of tubular reactor that this embodiment adopted, arrange the even distribution of air flow board 8 below reaction mixing tube 7, flue gas stream passes through perforated plate even distribution of air flow ware, gets into reaction mixing tube 7 abundant reactions, SO in SOx/NOx control agent 2 and the flue gas2、NOxFully reacted, partially reacted product and unreacted drugThe agent falls into an ash bucket at the bottom of the tubular reactor 6, and gas after reaction is sent into a dust remover from a gas outlet.
The side surface of the dust remover close to the lower part is provided with a gas inlet, the side surface close to the top is provided with a gas outlet, and the bottom is provided with a solid waste outlet. The gas inlet of the dust remover is connected with the gas outlet of the pipe reactor 6 through the wind pipe 10, and the reacted gas enters the dust remover for dust removal and then is discharged through the chimney 24. In this embodiment, the dust remover adopts two-stage dust removal, that is, the dust remover comprises a cyclone dust remover 11 and a bag filter 13, and the tubular reactor 6, the cyclone dust remover 11, the bag filter 13 and the chimney 24 are connected in sequence. The cyclone dust collector 11 is an axial centrifugal cyclone which is used for solid-gas separation through centrifugation and used for collecting particles and unreacted reagents in the reacted gas, and meanwhile, the subsequent bag filter 13 can be pre-dedusted, so that the blockage of the bag filter 13 is effectively prevented, and the service life of the bag filter 13 is prolonged. The bag filter 13 comprises an internal airflow distributor 15 and a filter material 14 below the airflow distributor 15, wherein the filter material 14 is made of porous polytetrafluoroethylene sintered material and consists of polytetrafluoroethylene powder and MnOxPowder and pore-forming agent, and the air permeability is controlled to be 15-30m3/m2Min, further purifying SO in the flue gas2、NOxAnd the efficiency of removing the particles is more than 99.5 percent, and the ultralow emission can be realized.
The air outlet of the bag filter 13 is connected to a chimney 24 via an air duct 22 for exhausting the dedusted exhaust air, and a blower 23 is mounted on the air duct 22 to assist in drawing the air out of the deduster.
It is worth noting that the tubular reactor 6 cannot be completely reacted, and the insufficiently reacted waste materials, including the residual desulfurization and denitrification agent 2 and the insufficiently reacted products, fall into an ash hopper at the bottom of the tubular reactor 6 or enter a dust remover to be trapped. The present embodiment designs a waste bin 18, which connects the tubular reactor 6 and the solid waste outlet of the dust remover, for receiving the solid materials processed by the tubular reactor 6 and the dust remover. The bottom of the tubular reactor 6 is connected with an ash discharger 9, the bottom of the cyclone dust collector 11 is connected with a discharger 12, the bottom of the bag filter 13 is connected with a material conveyer 16, and the two are connected with a waste bin 18 through a pneumatic conveying pipe 17 to convey the solid waste into the waste bin 18. The waste bin 18 is connected with the medicament tank 1 through the pneumatic conveying pipe 20, the air pump 19 is installed on the pneumatic conveying pipe 20, and solid materials in the waste bin 18 are conveyed to the medicament tank 1 through the air pump 19, so that the waste can be recycled, the oxidant can completely react, and incomplete reaction products can continue to fully react.
Based on the complexity of adding the oxidant into the reagent mixing pipe 5 into the reagent tank 1, especially the recycled reaction waste, the dynamic change of the adding reagent amount of the reagent tank 1 and the flue gas proportion can be influenced, and how to ensure that the reagent amount meets the requirement of the flue gas oxidation reaction is very important. In the present embodiment, a concentration sensor 21 is provided at the gas outlet of the bag filter 13 for detecting the concentration of harmful gases and/or dust in the exhaust gas. The industrial personal computer 25 is electrically connected with the concentration sensor 21 and the quantitative feeder, and controls the feeding amount of the quantitative feeder by receiving signals of the concentration sensor 21, so that dynamic accurate control of feeding is achieved.
The flue gas desulfurization and denitration integrated device is adopted to carry out desulfurization and denitration treatment on the flue gas generated by the metallurgical sintering process, and the method specifically comprises the following steps:
step A: the quantitative feeder adds the oxidant in the reagent tank 1 into the reagent mixing pipe 5, meanwhile, the sintering flue gas is introduced from the flue gas inlet of the reagent mixing pipe 5, flows from the flue gas inlet to the flue gas outlet, and is fully mixed with the oxidant in the reagent mixing pipe 5 in the flowing process. In the step, the oxidant is Mn oxide with the grain size of 50-120 μm, and can be well and fully mixed with the flue gas, so that the sufficiency of subsequent reaction is ensured.
In the device operation process, concentration sensor 21 detects the harmful gas concentration of discharging tail gas through chimney 24 to and dust concentration, gives industrial computer 25 with signal transmission, and industrial computer 25 controls quantitative feeder pay-off volume according to the detected signal, guarantees that oxidant and flue gas ratio satisfy the reaction requirement.
And B: introducing the flue gas mixed in the step A into a tubular reactor 6 through a flue gas inlet; the gas is uniformly distributed through the gas flow uniform distribution plate 8 and fully reacts in the reaction mixing tube 7. The reaction solid product falls into a bottom hopper and the reaction gas is discharged through the gas outlet of the tubular reactor 6.
In the step, the reaction temperature in the tubular reactor 6 is 150-.
And C: and D, introducing the gas reacted in the step B into a dust remover through a gas inlet of the dust remover through an air pipe 10 for dust removal, and then discharging the gas through a chimney 24. In this step, the reaction gas is first introduced into the cyclone dust collector 11 to undergo primary dust removal under centrifugal force, and the gas after primary dust removal is then introduced into the bag filter 13 to undergo filtration and dust removal, and then discharged through the chimney 24.
In the step, the bag type dust collector filter material 14 is formed by mixing, sintering and compounding polytetrafluoroethylene powder, MnOx powder and a pore-forming agent according to a proportion, the air permeability is 15-30m3/m2.min, and the removal efficiency of dust and desulfurization product particles can reach more than 99.5%.
Step D: the solid materials processed in the step B and the step C are sent to a waste bin 18 for recycling, and are conveyed to the medicament tank 1 through an air pump 19 to be used as an oxidant for recycling.
From the above, this embodiment flue gas desulfurization denitration integrated device structure is simple relatively, and the flow is short, and the medicament is desulfurization denitration simultaneously, and the reaction is controllable, and reactor, filter material multi-stage purification, efficient, can extensively be used for the iron and steel trade sintering flue gas to administer. The device is simple to operate in desulfurization and denitrification of sintering flue gas, harmful gas is treated more thoroughly, and the treated gas meets the emission requirement.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.

Claims (10)

1. The utility model provides a flue gas desulfurization denitration integrated device which characterized in that includes:
a chemical tank (1) for storing an oxidant for desulfurization and denitrification;
a chemical mixing pipe (5) which is connected with the chemical tank (1), has a flue gas inlet and is used for mixing flue gas with an oxidant for desulfurization and denitrification;
the tubular reactor (6) is used for carrying out oxidation reaction on the oxidant introduced into the medicament mixing pipe (5) and the flue gas mixture;
the dust remover is used for removing dust from the tail gas after the reaction in the tubular reactor (6);
and the chimney (24) is connected with the dust remover through the fan (23) and is used for discharging tail gas dedusted by the dust remover.
2. The integrated device for desulfurization and denitrification of flue gas according to claim 1, characterized in that: the device also comprises a waste bin (18) which is used for receiving the solid materials processed by the tubular reactor (6) and the dust remover; the waste bin (18) conveys the solid materials to the medicament tank (1) through an air pump (19).
3. The integrated device for desulfurization and denitrification of flue gas according to claim 1 or 2, characterized in that: the medicament tank (1) conveys an oxidant into the medicament mixing pipe (5) through a quantitative feeder.
4. The integrated device for desulfurization and denitrification of flue gas according to claim 3, characterized in that: the system also comprises an industrial personal computer (25); a gas outlet of the dust remover is provided with a concentration sensor (21) for detecting the concentration of harmful gas and/or dust in the tail gas; and the industrial personal computer (25) controls the feeding amount of the quantitative feeder by receiving signals of the concentration sensor (21).
5. The integrated device for desulfurization and denitrification of flue gas according to claim 2, characterized in that: the dust remover comprises a cyclone dust remover (11) and a bag filter (13), and the tubular reactor (6), the cyclone dust remover (11), the bag filter (13) and a chimney (24) are connected in sequence.
6. The integrated device for desulfurization and denitrification of flue gas according to claim 5, characterized in that: the tubular reactor (6), the cyclone dust collector (11) and the bag filter (13) are respectively connected with a waste bin (18) through an ash discharger (9), a discharger (12) and a material conveyor (16) by pipelines.
7. A flue gas desulfurization and denitrification method, which adopts the flue gas desulfurization and denitrification integrated device of claim 1 to perform desulfurization and denitrification treatment on flue gas, and comprises the following specific steps:
step A: adding an oxidant in the reagent tank (1) into the reagent mixing pipe (5), and simultaneously introducing smoke, wherein the smoke and the oxidant are mixed in the reagent mixing pipe (5);
and B: introducing the flue gas mixed with the oxidant into a tubular reactor (6) for reaction;
and C: and D, introducing the gas reacted in the step B into a dust remover for dust removal, and then discharging the gas through a chimney (24).
8. The flue gas desulfurization and denitrification method according to claim 7, characterized in that: and C, recovering the solid materials treated in the step B and the step C, and conveying the solid materials into the medicament tank (1) to be used as an oxidant for recycling.
9. The flue gas desulfurization and denitrification method according to claim 7, characterized in that: and C, detecting the concentration of harmful gas and/or dust in the tail gas subjected to dust removal in the step C through a concentration sensor (21), transmitting a signal to an industrial personal computer (25), and controlling the feeding amount of the medicament tank (1) to the medicament mixing pipe (5) through the industrial personal computer (25).
10. The flue gas desulfurization and denitrification method according to claim 7, characterized in that: the oxidant is Mn oxide with the particle size of 50-120 mu m; the reaction temperature in step B is 150 ℃ and 180 ℃.
CN202110940251.8A 2021-08-17 2021-08-17 Flue gas desulfurization and denitrification integrated device and method Pending CN113559688A (en)

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