CN110935302A - Dynamically adjustable flue ozone oxidation NOx control system and method - Google Patents
Dynamically adjustable flue ozone oxidation NOx control system and method Download PDFInfo
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- CN110935302A CN110935302A CN201911183896.0A CN201911183896A CN110935302A CN 110935302 A CN110935302 A CN 110935302A CN 201911183896 A CN201911183896 A CN 201911183896A CN 110935302 A CN110935302 A CN 110935302A
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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
- B01D53/76—Gas phase processes, e.g. by using aerosols
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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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/104—Ozone
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention relates to a dynamically adjustable flue ozone oxidation NOx control system and a method, wherein the system comprises a flue gas mixer, an air injection grid and an ozone injection grid which are arranged in a straight flue, and a flue gas flow testing device, a flue gas temperature testing device, an inlet NOx online analyzer, an ozone electromagnetic valve, an ozone generator, a dynamic control system, an ozone flowmeter, a compressed air inlet pipe, an air electromagnetic valve, an air flowmeter and an outlet NOx online analyzer which are arranged outside the straight flue; on the premise of ensuring the NOx oxidation degree, different ozone/NOx molar ratios in different areas are controlled to realize uneven ozone concentration distribution, a complete oxidation area and a non-oxidation area of NO are formed, and NOx to be removed in flue gas is oxidized into N2O5Absorbed and NOx which is discharged after reaching the standard is discharged in the form of NO, thus reducing NO in the smoke as much as possible2Content, reducing ozone consumption.
Description
Technical Field
The invention relates to the field of flue gas denitration, in particular to a dynamically adjustable flue ozone oxidation NOx control system and method.
Background
At present, the NOx denitration by ozone oxidation is widely applied to the denitration process of coal-fired boiler flue gas in the industries of steel, coking and the like, and is divided into two types according to the general technical route of ozone oxidation products, wherein one type is to oxidize NO in the flue gas into N completely2O5Then absorbing and removing the smoke by a subsequent wet process, and oxidizing all NO in the smoke into NO2The removal is carried out by a wet or semi-dry process. Due to nitrogen oxides N2O5The wet method has high absorption efficiency, so the technical scheme that NO is excessively oxidized by ozone is widely adopted, but in the engineering application process, the emission reaches the standard, the ozone injection is excessive, and the residual nitrogen oxides in the denitrified smoke are mainly NO2The problem that arises is that, on the one hand, this part of the NO which is originally discharged to meet environmental regulations is still oxidized to NO by ozone2Leading to waste of ozone; on the other hand, NO2The oxidability of the catalyst is stronger than that of NO, and the catalyst has greater harm to human bodies and the environment. At present, the problem of ozone excessive oxidation is ubiquitous in denitration engineering.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a dynamically adjustable flue ozone oxidation NOx control system and method, which have the advantages of simple structure, reasonable design and reliable control, and avoid the problems of ozone oxidation waste and pollution of high toxicity of nitrogen oxides at a flue gas outlet.
The invention is realized by the following technical scheme:
a dynamically adjustable flue ozone oxidation NOx control system comprises a flue gas mixer, an air injection grid and an ozone injection grid which are arranged in a straight flue, and a flue gas flow testing device, a flue gas temperature testing device, an inlet NOx online analyzer, an ozone electromagnetic valve, an ozone generator, a dynamic control system, an ozone flowmeter, a compressed air inlet pipe, an air electromagnetic valve, an air flowmeter and an outlet NOx online analyzer which are arranged outside the straight flue;
the flue gas mixer, the measuring point of the flue gas flow testing device, the measuring point of the flue gas temperature testing device and the measuring point of the inlet NOx online analyzer are sequentially arranged in the straight flue along the flow direction of flue gas;
an outlet pipeline of the ozone generator is sequentially connected with an ozone electromagnetic valve, an ozone flowmeter and an ozone injection grid, a compressed air inlet pipe is sequentially connected with an air electromagnetic valve, an air flowmeter and an air injection grid, the ozone injection grid and the air injection grid are arranged in a straight flue behind a measuring point of an inlet NOx online analyzer in parallel, and the measuring point of the outlet NOx online analyzer is arranged in a straight flue at least m behind the ozone injection grid;
the input end of the dynamic control system is respectively connected with the output ends of the flue gas flow testing device, the flue gas temperature testing device, the inlet NOx online analyzer, the ozone flowmeter, the air flowmeter and the outlet NOx online analyzer; the output end of the dynamic control system is respectively connected with the input ends of the ozone generator, the ozone electromagnetic valve and the air electromagnetic valve.
Preferably, the inlet NOx online analyzer is provided with a plurality of measuring points arranged by adopting a grid method, all the measuring points are arranged on the same straight flue section, and one measuring point is respectively and independently connected with a channel of the inlet NOx online analyzer in a matching manner.
Preferably, the outlet NOx online analyzer is provided with a plurality of measuring points arranged by adopting a grid method, all the measuring points are arranged on the section of the same straight flue, and one measuring point is respectively and independently connected with a channel of the outlet NOx online analyzer in a matching manner.
Furthermore, the arrangement positions of the measuring points of the inlet NOx online analyzer and the measuring points of the outlet NOx online analyzer are in one-to-one correspondence, the arrangement positions on the cross section of the flue are the same, and the number and the intervals are the same.
Preferably, the ozone injection grid comprises a plurality of columns of grids vertically arranged in a row, each column of grids is provided with an independent gas inlet, and each gas inlet pipeline is sequentially connected with an independent ozone flowmeter and an ozone electromagnetic valve respectively.
Further, each row of ozone injection grids and one row of air injection grids are arranged in the straight flue side by side and vertically at equal intervals, and the air injection grids are arranged adjacent to the side wall of the flue.
A dynamically adjustable flue ozone oxidation NOx control method is based on the system and comprises the following steps,
the dynamic control system calculates the total amount of NOx to be oxidized according to the flow data of the flue gas flow testing device, the temperature data of the flue gas temperature testing device, the mean value of the NOx concentration data of the inlet NOx on-line analyzer and the preset NOx emission limit value data of the outlet, and calculates the required ozone injection amount according to the molar ratio of ozone to NOx to be oxidized being 1-3;
the dynamic control system controls the preparation power of the ozone generator according to the injection quantity of the ozone, adjusts the opening of different ozone electromagnetic valves, keeps the injection flow of each row of the injection ozone grid equal in the initial state,
the dynamic control system takes the NOx value in the outlet NOx online analyzer as zero as a regulation target according to the NOx concentration values of different grid areas of the outlet NOx online analyzer, and adjusts the opening degree of an ozone electromagnetic valve on a row corresponding to the ozone injection grid;
when the NOx concentration value appears, the opening degree of the ozone electromagnetic valve corresponding to the NOx concentration value is increased; when the concentration of NOx is zero, the opening degree of an ozone electromagnetic valve corresponding to the NOx is reduced;
the dynamic control system controls the opening of an air electromagnetic valve of the air injection grille and keeps the flow of the air flow meter to be 2-10 times of the flow of the adjacent ozone injection grille all the time.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the dynamically adjustable flue ozone oxidation NOx control system and method, on the premise of ensuring the NOx oxidation degree, different ozone/NOx molar ratios in different areas are controlled to realize uneven ozone concentration distribution, a completely oxidized area and an unoxidized area of NO are formed, and NOx to be removed in flue gas is oxidized into N2O5Absorbed and NOx which is discharged after reaching the standard is discharged in the form of NO, thus reducing NO in the smoke as much as possible2Content, reduces ozone consumption, effectively reduces NO discharged from a flue gas outlet2The content of the nitrogen oxide in the flue gas reduces the environmental pollution, and solves the problems of waste due to ozone oxidation and pollution caused by high toxicity of nitrogen oxide at a flue gas outlet.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a layout view of a cross section of a straight flue according to the present invention;
FIG. 3 is a layout of inlet and outlet NOx test points within a flue according to the present invention;
wherein, 1 is a flue gas mixer, 2 is a flue gas flow testing device, 3 is a flue gas temperature testing device, 4 is an inlet NOx online analyzer, 5 is an ozone electromagnetic valve, 6 is an ozone generator, 7 is a dynamic control system, 8 is an ozone flowmeter, 9 is a compressed air inlet pipe, 10 is an air electromagnetic valve, 11 is an air flowmeter, 12 is an air injection grid, 13 is an ozone injection grid, and 14 is an outlet NOx online analyzer.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
As shown in fig. 1, the dynamically adjustable flue ozone oxidation NOx control system according to the present invention includes a flue gas mixer 1, a flue gas flow rate testing device 2, a flue gas temperature testing device 3, an inlet NOx on-line analyzer 4, an ozone solenoid valve 5, an ozone generator 6, a dynamic control system 7, an ozone flowmeter 8, a compressed air inlet pipe 9, an air solenoid valve 10, an air flowmeter 11, an air injection grid 12, an ozone injection grid 13, and an outlet NOx on-line analyzer 14.
Arranging a flue gas mixer 1, a flue gas flow testing device 2, a flue gas temperature testing device 3 and a measuring point of an inlet NOx online analyzer 4 in a straight flue along the flow direction of flue gas in sequence, connecting an outlet pipeline of an ozone generator 6 with inlets of an ozone electromagnetic valve 5, an ozone flowmeter 8 and an ozone injection grid 13 in sequence, connecting a compressed air inlet pipe 9 with an air electromagnetic valve 10, an air flowmeter 11 and an air injection grid 12 in sequence, arranging the ozone injection grid 13 and the air injection grid 12 in the straight flue behind the measuring point of the inlet NOx online analyzer 4 in parallel, and arranging a measuring point of the outlet NOx online analyzer 14 in the straight flue 5m behind the ozone injection grid 13;
the input end of the dynamic control system 7 is respectively connected with the output ends of the flue gas flow testing device 2, the flue gas temperature testing device 3, the inlet NOx online analyzer 4, the ozone flowmeter 8, the air flowmeter 11 and the outlet NOx online analyzer 14; the output end of the dynamic control system 7 is respectively connected with the input ends of the ozone generator 6, the ozone electromagnetic valve 5 and the air electromagnetic valve 10.
The measuring points of the inlet NOx online analyzer 4 are arranged at the same flue section in a grid method, and one measuring point is respectively matched with a channel of the NOx online analyzer.
The measuring points of the outlet NOx online analyzer 14 are arranged at the same flue section in a grid method, and one measuring point is respectively matched with a channel of the NOx online analyzer.
The arrangement positions of the measuring points of the inlet NOx online analyzer 4 and the measuring points of the outlet NOx online analyzer 14 are in one-to-one correspondence, the arrangement positions on the cross section of the flue are the same, and the number and the intervals are the same.
The ozone injection grid 13 comprises a plurality of grids arranged in a row, each grid is provided with an independent gas inlet, and each gas inlet pipeline is sequentially connected with an independent ozone flowmeter 8 and an ozone electromagnetic valve 5 respectively.
As shown in fig. 2, the ozone injection grills 13 are arranged side by side and in equal intervals vertically in the straight flue, and the air injection grills 12 are disposed adjacent to the side wall of the flue.
The invention discloses a dynamically adjustable flue ozone oxidation NOx control method, wherein a dynamic control system 7 calculates the total amount of NOx to be oxidized through flow data of a flue gas flow testing device 2, temperature data of a flue gas temperature testing device 3, the mean value of NOx concentration data of an inlet NOx online analyzer 4 and NOx emission limit value data preset at an outlet, and calculates the required ozone injection amount according to the molar ratio of ozone to NOx to be oxidized of 1-3; when the total NOx amount is calculated, the total NOx amount is the flue gas amount Q (inlet concentration-outlet concentration), and Q is obtained by converting the actual temperature to the standard condition.
The dynamic control system 7 controls the preparation power of the ozone generator 6 according to the injection quantity of the ozone, and adjusts the opening and initial state of different ozone electromagnetic valves 5Keeping the equal injection flow of each row of the injection ozone grids 13 in the state, adjusting the opening degree of the ozone electromagnetic valve 5 corresponding to the NOx concentration value when the NOx concentration value appears according to the NOx concentration value of different grid areas of the outlet NOx online analyzer 14 by the dynamic control system 7, and adjusting the opening degree of the ozone electromagnetic valve 5 corresponding to the NOx concentration value when the NOx concentration value is zero, wherein each row of grids corresponds to one corresponding measuring point as shown in figures 2 and 3; finally, the NOx value in the corresponding outlet NOx on-line analyzer 14 after the ozone is sprayed to the grid 13 is zero, and a complete oxidation area of NO is formed; the dynamic control system 7 controls the opening of the air electromagnetic valve 10, the flow of the air flow meter 11 is kept to be 2-10 times of the flow of the adjacent ozone injection grating all the time, and an NO non-oxidation area is formed. The uneven distribution of ozone in the flue is realized through dynamic control of a flow field, so that NOx which is discharged up to the standard is mainly released in the form of NO, and NO in flue gas is reduced as much as possible2。
The system and the method can dynamically control the concentration of ozone in different flue regions, and realize the oxidation of partial NO in the flue to high-valence nitrogen oxide N2O5Reduction of NO2The generation of ozone effectively reduces the spraying amount of ozone and reduces the environmental pollution.
Claims (7)
1. A dynamically adjustable flue ozone oxidation NOx control system is characterized by comprising a flue gas mixer (1), an air injection grid (12) and an ozone injection grid (13) which are arranged in a straight flue, and a flue gas flow testing device (2), a flue gas temperature testing device (3), an inlet NOx online analyzer (4), an ozone electromagnetic valve (5), an ozone generator (6), a dynamic control system (7), an ozone flowmeter (8), a compressed air inlet pipe (9), an air electromagnetic valve (10), an air flowmeter (11) and an outlet NOx online analyzer (14) which are arranged outside the straight flue;
the flue gas mixer (1), the measuring point of the flue gas flow testing device (2), the measuring point of the flue gas temperature testing device (3) and the measuring point of the inlet NOx online analyzer (4) are sequentially arranged in the straight flue along the flow direction of flue gas;
an outlet pipeline of an ozone generator (6) is sequentially connected with an ozone electromagnetic valve (5), an ozone flowmeter (8) and an ozone injection grid (13), a compressed air inlet pipe (9) is sequentially connected with an air electromagnetic valve (10), an air flowmeter (11) and an air injection grid (12), the ozone injection grid (13) and the air injection grid (12) are arranged in a straight flue behind a measuring point of an inlet NOx online analyzer (4) side by side, and a measuring point of an outlet NOx online analyzer (14) is arranged in a straight flue at least (5) m behind the ozone injection grid (13);
the input end of the dynamic control system (7) is respectively connected with the output ends of the flue gas flow testing device (2), the flue gas temperature testing device (3), the inlet NOx online analyzer (4), the ozone flowmeter (8), the air flowmeter (11) and the outlet NOx online analyzer (14); the output end of the dynamic control system (7) is respectively connected with the input ends of the ozone generator (6), the ozone electromagnetic valve (5) and the air electromagnetic valve (10).
2. The dynamically adjustable flue ozone oxidation NOx control system according to claim 1, characterized in that the inlet NOx online analyzer (4) is provided with a plurality of measuring points arranged by adopting a grid method, all measuring points are arranged at the same straight flue section, and one measuring point is respectively and independently connected with a channel of the inlet NOx online analyzer (4) in a matching manner.
3. The dynamically adjustable flue ozone oxidation NOx control system according to claim 1 or 2, characterized in that the outlet NOx online analyzer (14) is provided with a plurality of measuring points arranged by adopting a grid method, all measuring points are arranged at the same straight flue section, and one measuring point is respectively and independently connected with a channel of the outlet NOx online analyzer (14) in a matching manner.
4. The dynamically adjustable flue ozone oxidation NOx control system of claim 3, wherein the arrangement positions of the measuring points of the inlet NOx online analyzer (4) and the measuring points of the outlet NOx online analyzer (14) are in one-to-one correspondence, and the arrangement positions on the cross section of the flue are the same, and the number and the intervals are the same.
5. A dynamically adjustable flue ozonation NOx control system according to claim 1, wherein the ozone injection grid (13) comprises a plurality of columns of grids arranged in vertical rows, each column of grids is provided with an individual gas inlet, and each gas inlet pipe is connected in turn with an individual ozone flow meter (8) and an ozone solenoid valve (5), respectively.
6. A dynamically adjustable flue ozonation NOx control system according to claim 5, wherein each row of ozone injection grills (13) and each column of air injection grills (12) are arranged vertically in a straight flue side by side and at equal intervals, the air injection grills (12) being disposed adjacent to the flue sidewalls.
7. A dynamically adjustable flue ozone oxidation NOx control method, characterized by, based on the system of claim 4, comprising the following steps,
the dynamic control system (7) calculates the total amount of NOx to be oxidized according to the flow data of the flue gas flow testing device (2), the temperature data of the flue gas temperature testing device (3), the mean value of the NOx concentration data of the inlet NOx online analyzer (4) and the preset NOx emission limit value data of an outlet, and calculates the required ozone injection amount according to the molar ratio of ozone to NOx to be oxidized of 1-3;
the dynamic control system (7) controls the preparation power of the ozone generator (6) according to the injection quantity of the ozone, adjusts the opening degrees of different ozone electromagnetic valves (5), keeps the injection flow quantity of each row of the injection ozone grid (13) equal in the initial state,
the dynamic control system (7) takes the NOx value in the outlet NOx online analyzer (14) as zero as a regulation target according to the NOx concentration values of different grid areas of the outlet NOx online analyzer (14), and adjusts the opening degree of the ozone electromagnetic valve (5) on the corresponding column of the ozone injection grid (13);
when the NOx concentration value appears, the opening degree of the ozone electromagnetic valve (5) corresponding to the NOx concentration value is increased; when the concentration of NOx is zero, the opening degree of the ozone electromagnetic valve (5) corresponding to the NOx is reduced;
the dynamic control system (7) controls the opening of an air electromagnetic valve (10) of the air injection grille (12) and keeps the flow of the air flow meter (11) to be 2-10 times of the flow of the adjacent ozone injection grille (13) all the time.
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