CN112915737A - Industrial tail gas pollutant removal system and removal method - Google Patents
Industrial tail gas pollutant removal system and removal method Download PDFInfo
- Publication number
- CN112915737A CN112915737A CN202110405147.9A CN202110405147A CN112915737A CN 112915737 A CN112915737 A CN 112915737A CN 202110405147 A CN202110405147 A CN 202110405147A CN 112915737 A CN112915737 A CN 112915737A
- Authority
- CN
- China
- Prior art keywords
- flue gas
- industrial tail
- tail gas
- gas
- external circulation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003344 environmental pollutant Substances 0.000 title claims abstract description 90
- 231100000719 pollutant Toxicity 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims description 12
- 239000003546 flue gas Substances 0.000 claims abstract description 128
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 125
- 239000007789 gas Substances 0.000 claims abstract description 124
- 238000000746 purification Methods 0.000 claims abstract description 38
- 238000000605 extraction Methods 0.000 claims abstract description 36
- 238000012806 monitoring device Methods 0.000 claims abstract description 33
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 9
- 238000006477 desulfuration reaction Methods 0.000 claims abstract 3
- 230000023556 desulfurization Effects 0.000 claims abstract 3
- 238000005086 pumping Methods 0.000 claims description 8
- 230000007704 transition Effects 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 239000000356 contaminant Substances 0.000 claims description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 15
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 abstract description 12
- 238000004064 recycling Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 4
- 238000004140 cleaning Methods 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- -1 moisture Chemical compound 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/30—Controlling by gas-analysis apparatus
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses an industrial tail gas pollutant removal system, which comprises a main flue gas purification system, wherein the main flue gas purification system comprises a desulfurization tower, a denitration tower and other pollutant removal devices; the industrial tail gas pollutant removal system further comprises: the external circulation air extraction system circularly purifies the purified and undischarged industrial tail gas before the industrial tail gas is extracted into the desulfurizing tower; wherein, main gas cleaning system still includes: the inlet flue gas online monitoring device is used for detecting inlet industrial tail gas; the flue gas mixer is used for mixing the detected inlet industrial tail gas with the industrial tail gas extracted by the external circulation air extraction system; and the outlet flue gas online monitoring device is used for detecting the discharged industrial tail gas. According to the invention, the external circulation air exhaust system is arranged, and the main flue gas purification system is used for recycling and purifying the industrial tail gas, so that the removal effect of pollutants such as sulfur dioxide and nitrogen oxide is further enhanced while an additional pollutant removal device is avoided.
Description
Technical Field
The invention belongs to the technical field of industrial tail gas purification, and particularly relates to an industrial tail gas recycling treatment system and a removal process.
Background
At present, industrial tail gas in the industries of metallurgy, coke, electric power and the like mainly contains pollutants such as sulfur dioxide, nitrogen oxide and the like, which bring serious harm to human health and ecological environment, and countries and places have strict requirements on the content of pollutants discharged by tail gas in various industries. The existing technology for removing the pollutants in the industrial tail gas has the defects of limited treatment capacity, low pollutant removal rate or incapability of completely removing the pollutants, and the other hand needs to add a new removing agent while removing the pollutants, such as ammonia spraying in the selective catalytic reduction method and selective non-catalytic reduction method denitration technology.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides an industrial tail gas pollutant removal system, which can effectively avoid secondary pollution caused by excessive addition of a removal agent while further improving the pollutant removal effect.
In order to achieve the purpose, the invention provides an industrial tail gas pollutant removing system which comprises a main flue gas purifying system, wherein the main flue gas purifying system comprises a desulfurizing tower, a denitrifying tower and other pollutant removing devices, and industrial tail gas to be purified is discharged after sequentially passing through the desulfurizing tower, the denitrifying tower and the other pollutant removing devices; the industrial tail gas pollutant removal system further comprises:
the external circulation air extraction system circularly purifies the purified industrial tail gas to be discharged again by the main flue gas purification system;
wherein, main gas cleaning system still includes:
the inlet flue gas online monitoring device is used for detecting inlet industrial tail gas;
the flue gas mixer is used for mixing the detected inlet industrial tail gas with the industrial tail gas extracted by the external circulation air extraction system;
and the outlet flue gas online monitoring device is used for detecting the discharged industrial tail gas.
According to the invention, the inlet flue gas and outlet flue gas online detection device is arranged to detect the industrial tail gas, so that the industrial tail gas which does not reach the standard is prevented from being discharged, and the recycling treatment of the industrial tail gas is realized and the purification treatment of the industrial tail gas is effectively realized through the arrangement of the external circulation air exhaust system. Meanwhile, the external circulation air extraction system recycles part of industrial tail gas to be discharged in the main flue gas purification system, an additional pollutant removal device is not required, the existing system is convenient to transform, and the cost is reduced.
Furthermore, the external circulation air extraction system comprises an air collection device, an inlet valve, a circulating fan, an outlet valve and a flow temperature and pressure detection instrument which are sequentially connected through an external circulation air extraction pipeline; the gas collecting device is arranged between the other pollutant removing device and the outlet flue gas online monitoring device, and a part of industrial tail gas purified and discharged by the other pollutant removing device is sent into the flue gas mixer through the gas collecting device and the circulating fan in sequence; the inlet valve and the outlet valve are respectively arranged on the pipeline of the external circulation air exhaust system between the gas collection device and the circulating fan and between the circulating fan and the flue gas mixer; the flow temperature and pressure detecting instrument is arranged on an external circulation air exhaust system pipeline between the outlet valve and the flue gas mixer.
The gas collection device and the circulating fan are used for realizing the recycling extraction of the industrial tail gas, the inlet valve and the outlet valve are used for regulating the opening and closing of the external circulation air exhaust system, the extraction amount of the recycling industrial tail gas and the emission amount of the industrial tail gas are regulated and controlled through the operation frequency regulation of the circulating fan according to the detection result of the outlet flue gas online detection device, the adjustment of a main flue gas purification system is avoided, the pollution removal burden and the fault rate of the main flue gas purification system are reduced, and the safe and stable operation of the main flue gas purification system is effectively guaranteed.
Furthermore, the outlet flue gas on-line monitoring device is respectively connected with the circulating fan and the flow temperature and pressure detection instrument in a control mode, and linkage regulation and control of the circulating fan and flue gas parameters in the industrial tail gas pollutant removal process are effectively achieved.
Further, the gas collecting device comprises straight pipe section pipelines at two ends, conical section pipelines and transition section pipelines communicated with the conical section pipelines, the straight pipe section pipelines at the two ends are respectively communicated with other pollutant removing devices and the outlet flue gas online monitoring device, and the transition section pipelines are communicated with the circulating fan through an external circulation air suction pipeline; the interior of the conical section pipeline is an annular cavity, the cross section of the conical section pipeline is wide at the end close to an axial line, narrow at the end far from the axial line, and trapezoidal at two sides, and the conical section pipeline is stably transited from a middle large caliber to small calibers at two ends; the transition section pipeline is streamline. The gas collecting device reduces the resistance of the industrial tail gas entering the external circulation air exhaust system, saves the energy consumption of the circulating fan, and is beneficial to the industrial tail gas in the pipeline of the main flue gas purification system to uniformly flow into the external circulation air exhaust system.
Further, the flue gas mixer comprises a shell, an air inlet pipe and a nozzle; one end of the shell is hermetically connected with the inlet flue gas online monitoring device through a pipeline, and the other end of the shell is hermetically connected with the desulfurizing tower through a pipeline; one end of the air inlet pipe penetrates through the shell to be connected with the external circulation air extraction pipeline, and the other end of the air inlet pipe is positioned in the shell and communicated with the nozzle; the gas spraying direction of the nozzle faces to the direction of the inlet flue gas on-line monitoring device (namely, the gas spraying direction is opposite to the flow direction of the inlet flue gas of the main flue gas purification system).
Further, the shell of the flue gas mixer is in a horn mouth shape, and the caliber of one end of the shell facing the inlet flue gas on-line monitoring device is large.
Furthermore, the nozzle is streamline and flat.
The design of the flue gas mixer and the nozzle is beneficial to the diffusion and the uniform mixing of the recycling industrial tail gas of the external circulation air extraction system in the main flue gas purification system.
Further, the air inlet pipe of the flue gas mixer is connected with the shell through a flange. And the nozzle is convenient to overhaul by adopting a flange connection mode.
The circulating fan adopts a variable frequency fan.
The invention also provides a method for removing the industrial tail gas pollutants by adopting the industrial tail gas pollutants removal system, which detects the discharged industrial tail gas through the outlet flue gas online monitoring device and adjusts the flow of the industrial tail gas of the external circulation air exhaust system: when the main flue gas purification system operates alone for a long time and the emission can reach the standard, the external circulation air exhaust system is closed; otherwise, when the measured pollutant content is low, reducing the flow of the industrial tail gas extracted by the external circulation air extraction system; and when the measured pollutant content is high, increasing the flow of the industrial tail gas extracted by the external circulation air extraction system.
Further, the method detects the discharged industrial tail gas through the outlet flue gas online monitoring device, and adjusts the flow of the industrial tail gas of the external circulation air exhaust system: when the content of the pollutants is low, the frequency of a circulating fan is reduced, and the flow of the industrial tail gas extracted by an external circulation air extraction system is reduced; and when the content of the pollutants is high, increasing the frequency of the circulating fan and increasing the flow of the industrial tail gas extracted by the external circulation air extraction system.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the external circulation air exhaust system is arranged, and the main flue gas purification system is used for recycling and purifying the industrial tail gas, so that the removal effect of pollutants such as sulfur dioxide and nitrogen oxide is further enhanced while an additional pollutant removal device is avoided;
2. the escape rate of the remover is reduced, the secondary pollution is reduced, the use rate of the remover is improved, and the pollutant control cost is reduced;
3. the industrial tail gas flow regulation of the external circulation air exhaust system is realized through the circulating fan, so that the pollutant discharge amount is controlled, the regulation of the main flue gas purification system is avoided, the pollution removal burden and the fault rate of the main flue gas purification system are reduced, and the safe and stable operation of the main flue gas purification system is ensured;
4. meanwhile, when the content of pollutants at the flue gas outlet is reduced, the flow of the external circulation air pumping system is reduced, or the external circulation air pumping system is closed, pollutants are removed by the main flue gas purification system, and the energy consumption of the external circulation air pumping system is reduced while the pollutant emission requirement is ensured.
5. The invention designs the flue gas mixer and the gas collecting device when the industrial tail gas is diffused and uniformly mixed, reduces the resistance of the circulation of the industrial tail gas by utilizing the trumpet-shaped flue gas mixer and the streamlined and flat nozzle, saves the energy consumption of the circulating fan, is favorable for uniformly mixing the industrial tail gas at the inlet with the recycled industrial tail gas, and simultaneously sprays gas in a direction opposite to the flow direction of the flue gas of the main flue gas purification system, thereby being favorable for the diffusion and uniform distribution of the recycled industrial tail gas in the external circulation air exhaust system.
6. The industrial tail gas pollutant removal system has the advantages of simple structure, high feasibility and low capital investment, can be used in a newly-built industrial tail gas pollutant treatment system, and can also be used for reconstructing the built industrial tail gas pollutant treatment system.
Drawings
FIG. 1 is a schematic diagram of a system for removing contaminants from industrial tail gas according to the present invention;
FIG. 2 is a schematic diagram of the flue gas mixer of FIG. 1;
FIG. 3 is a schematic structural view of the intake pipe and the nozzle of FIG. 1;
fig. 4 is a schematic structural diagram of the gas collecting device in fig. 1.
In the figure, 1-inlet flue gas online monitoring device, 2-flue gas mixer, 3-desulfurizing tower, 4-denitrifying tower, 5-other pollutant removing device, 6-outlet flue gas online monitoring device, 7-gas collecting device, 8-inlet valve, 9-circulating fan, 10-outlet valve, 11-flow temperature and pressure detecting instrument, 12-inlet pipe, 13-nozzle, 14-shell, 15-chimney, 16-straight pipe section pipeline, 17-conical section pipeline and 18-transition section pipeline.
Detailed Description
The industrial tail gas pollutant removal system is described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the system for removing pollutants from industrial tail gas of the present invention includes a main flue gas purification system and an external circulation air extraction system. The main flue gas purification system is respectively provided with an inlet flue gas online monitoring device 1, a flue gas mixer 2, a desulfurizing tower 3, a denitration tower 4, other pollutant removing devices 5, an outlet flue gas online monitoring device 6 and a chimney 15 according to the flowing direction of flue gas.
The inlet flue gas online monitoring device 1 and the outlet flue gas online monitoring device 6 can monitor the content of the flue gas components such as sulfur dioxide, nitrogen oxide, ammonia gas, oxygen, moisture, carbon dioxide and the like in the inlet flue gas and the outlet flue gas (namely industrial tail gas), and the temperature, pressure, flow and other data of the flue gas.
As shown in fig. 2, the flue gas mixer 2 is composed of a housing 14, a flange, an inlet pipe 12 and a nozzle 13. The shell of the flue gas mixer 2 is horn-shaped, and has a large inlet and a small outlet, which is beneficial to the uniform mixing of the gas of the main flue gas purification system and the gas of the external circulation gas extraction system. The air inlet pipe 12 and the nozzle 13 are connected with the shell 14 through flanges, and the nozzle is convenient to overhaul. As shown in fig. 3, the nozzle 13 is designed to be streamlined and flat, so that the gas resistance in the flue gas mixer is reduced, and the nozzle 13 ejects gas in a direction opposite to the gas flow direction of the main flue gas purification system (i.e., the gas ejection direction of the nozzle 13 faces the inlet flue gas online monitoring device 1), thereby facilitating the diffusion and uniform distribution of gas in the external circulation gas extraction system.
The outer circulation air extraction system is respectively provided with a gas collecting device 7, an inlet valve 8, a circulating fan 9, an outlet valve 10 and a flow temperature and pressure detecting instrument 11 according to the circulating direction of flue gas, and the circulating fan 9 is a variable frequency fan.
The gas collection device 7 is connected with the pipeline of the main flue gas purification system through straight pipe section pipelines 16 at two ends, the middle part is a conical section pipeline 17, an inclined wall annular cavity is arranged inside the conical section pipeline 17, and the annular cavity of the conical section pipeline 17 and the pipeline of the external circulation air extraction system are connected through a streamline transition section pipeline 18.
The system operation process comprises the following steps: when the external circulation air extraction system is closed, the flue gas passes through the inlet flue gas online monitoring device 1, the flue gas mixer 2, the desulfurizing tower 3, the denitration tower 4, the other pollutant removing device 5 and the outlet flue gas online monitoring device 6 in the main flue gas system and then is discharged into the atmosphere through the chimney 15, when the external circulation air extraction system is opened, after the flue gas in the main flue gas system flows out of the other pollutant removing device 5 and before the flue gas flows into the outlet flue gas online monitoring device 6, a part of the flue gas enters the conical section pipeline 17 from the straight pipe section pipeline 16 of the gas collecting device 7 of the external circulation air extraction system and then flows into the inlet valve 8, the circulating fan 9 and the outlet valve 10 from the transition section pipeline 18, enters the air inlet pipe 12 of the flue gas mixer 2, enters the shell 14 through the nozzle 13 and is mixed with the inlet flue gas of the main flue gas purification system, the flow rate temperature and pressure detecting instrument 11 monitors the flow rate of the flue gas flowing out from the outlet valve 10 before entering the, Temperature and pressure data. Wherein the circulating fan 9 is a frequency conversion fan and is linked with the outlet flue gas on-line monitoring device 6.
When the pollutant content measured by the outlet flue gas online monitoring device 6 is reduced, the flow of the recirculated flue gas in the external circulation air extraction system is reduced by reducing the frequency of the circulating fan 9; when the pollutant content measured by the outlet flue gas online monitoring system 6 is increased, the flow of the recirculated flue gas in the external circulation air extraction system is increased by increasing the frequency of the circulating fan 9.
The specific regulation and control modes of starting the external circulation system and frequency conversion of the circulating fan are as follows:
detect the pollutant SO in the outlet flue gas2、NoxThe concentration of other pollutants is a1、b1、c1Required pollutant SO2、NoxThe limit of the concentration of other pollutants is a0、b0、c0The flue gas flow in the main flue gas system is Q, and SO of each desulfurizing tower and each denitrifying tower2、NoxAnd the removal rate of other pollutants is m respectively0、m1、m2The pressure drop of the external circulation air pumping system is P1。
(1) When a is1>a0、b1>b0、c1>c0When at least one of them is satisfied, the external circulation air exhaust system needs to be operated. At this time:
flow Q of circulating fan1＝MAX[Q(a1-a0)/a1/(1-m0)，Q(b1-b0)/b1/(1-m1)，Q(c1-c0)/c1/(1-m2)]。
The running frequency N of the circulating fan is at the known flow rate Q1In time, the characteristic curve of the circulating fan can be deduced.
The pressure head P of the circulating fan is derived from the characteristic curve of the circulating fan, and P is ensured>P1。
(2) When a is1>a0、b1>b0、c1>c0When the smoke is not satisfied, the external circulation air extraction system can be closed, and the main smoke purification system can normally operate to meet the pollutant emission requirement.
The invention further enhances the removal effect of pollutants such as sulfur dioxide, nitrogen oxide and the like while avoiding the arrangement of an additional pollutant removal device; the escape rate of the remover is reduced, the secondary pollution is reduced, the utilization rate of the remover is improved, and the pollutant control cost is reduced.
When the pollutant content at the flue gas outlet rises, the pollutant discharge amount is controlled by improving the flow of the external circulation air exhaust system, the adjustment of the main flue gas purification system is avoided, the pollution removal burden and the fault rate of the main flue gas purification system are reduced, and the safe and stable operation of the main flue gas purification system is ensured.
When the pollutant content at the flue gas outlet is reduced, the energy consumption of the external circulation air pumping system is reduced or avoided while the pollutant emission requirement is ensured by reducing the flow of the external circulation air pumping system or closing the external circulation air pumping system.
The industrial tail gas pollutant removal system has the advantages of simple structure, high feasibility and low capital investment, can be used in a newly-built industrial tail gas pollutant treatment system, and can also be used for reconstructing the built industrial tail gas pollutant treatment system.
Claims (11)
1. An industrial tail gas pollutant removal system comprises a main flue gas purification system, wherein the main flue gas purification system comprises a desulfurization tower, a denitration tower and other pollutant removal devices, and industrial tail gas to be purified is discharged after sequentially passing through the desulfurization tower, the denitration tower and the other pollutant removal devices; it is characterized in that the industrial tail gas pollutant removing system further comprises:
the external circulation air extraction system circularly purifies the industrial tail gas extraction part purified by the main flue gas purification system again;
the main flue gas purification system further comprises:
the inlet flue gas online monitoring device is used for detecting inlet industrial tail gas;
the flue gas mixer is used for mixing the detected inlet industrial tail gas with the industrial tail gas extracted by the external circulation air extraction system;
and the outlet flue gas online monitoring device is used for detecting the discharged industrial tail gas.
2. The industrial tail gas pollutant removal system of claim 1, wherein the external circulation air extraction system comprises a gas collection device, an inlet valve, a circulation fan, an outlet valve, a flow temperature and pressure detection instrument which are connected in sequence through an external circulation air extraction pipeline; the gas collecting device is arranged between the other pollutant removing device and the outlet flue gas online monitoring device, and a part of industrial tail gas purified and discharged by the other pollutant removing device is sequentially sent into the flue gas mixer through the gas collecting device and the circulating fan; the inlet valve and the outlet valve are respectively arranged between the gas collecting device and the circulating fan and between the circulating fan and the flue gas mixer; the flow temperature and pressure detecting instrument is arranged between the outlet valve and the flue gas mixer.
3. The industrial tail gas pollutant removal system of claim 2, wherein the outlet flue gas on-line monitoring device is respectively connected with the circulating fan and the flow temperature and pressure detecting instrument in a control manner.
4. The system for removing industrial tail gas pollutants according to claim 3, wherein the gas collecting device comprises straight pipe section pipelines at two ends, a middle conical section pipeline and a transition section pipeline communicated with the conical section pipeline, the straight pipe section pipelines at two ends are respectively communicated with the other pollutant removing device and the outlet flue gas online monitoring device, and the transition section pipeline is communicated with the circulating fan through an external circulation air suction pipeline; the tapered pipeline is internally provided with an annular cavity, the cross section of the tapered pipeline is wide at the end close to an axial line, narrow at the end far from the axial line, and trapezoidal at two sides, and the tapered pipeline is stably transited from a large caliber in the middle to small calibers at two ends; the transition section pipeline is streamline.
5. The industrial tail gas pollutant removal system of claim 2, wherein the flue gas mixer comprises a housing, an inlet pipe and a nozzle; one end of the shell is hermetically connected with the inlet flue gas online monitoring device through a pipeline, and the other end of the shell is hermetically connected with the desulfurizing tower through a pipeline; one end of the air inlet pipe penetrates through the shell to be connected with the external circulation air extraction pipeline, and the other end of the air inlet pipe is positioned in the shell and communicated with the nozzle; the gas spraying direction of the nozzle is opposite to the flowing direction of the flue gas at the inlet of the main flue gas purification system.
6. The system for removing industrial exhaust gas pollutants according to claim 5, wherein the shell of the flue gas mixer is in a bell mouth shape, and the caliber of one end facing the inlet flue gas online monitoring device is large.
7. The industrial tail gas pollutant removal system of claim 6, wherein the nozzle is streamlined and flat.
8. The industrial tail gas pollutant removal system of claim 7, wherein the inlet pipe of the flue gas mixer is connected with the housing through a flange.
9. The method for removing the industrial tail gas pollutants by using the industrial tail gas pollutants removal system of claim 1 is characterized in that the discharged industrial tail gas is detected by the outlet flue gas online monitoring device, and the flow of the industrial tail gas of the external circulation air exhaust system is regulated: when the main flue gas purification system operates alone for a long time and the emission can reach the standard, the external circulation air exhaust system is closed; otherwise, when the measured pollutant content is low, reducing the flow of the industrial tail gas extracted by the external circulation air extraction system; and when the measured pollutant content is high, increasing the flow of the industrial tail gas extracted by the external circulation air extraction system.
10. The method for removing the industrial tail gas pollutants by using the industrial tail gas pollutants removal system of any one of claims 2 to 8 is characterized in that the discharged industrial tail gas is detected by the outlet flue gas online monitoring device, and the flow of the industrial tail gas of the external circulation air exhaust system is regulated: when the main flue gas purification system operates alone for a long time and the emission can reach the standard, the external circulation air exhaust system is closed; otherwise, when the pollutant content is low, the frequency of the circulating fan is reduced, and the flow of the industrial tail gas extracted by the external circulation air extraction system is reduced; and when the content of the pollutants is high, increasing the frequency of the circulating fan and increasing the flow of the industrial tail gas extracted by the external circulation air extraction system.
11. The stripping method as set forth in claim 10, characterized in that when the external circulation air exhaust system needs to be started, the flow Q of the circulating fan is controlled1＝MAX[Q(a1-a0)/a1/(1-m0)，Q(b1-b0)/b1/(1-m1)，Q(c1-c0)/c1/(1-m2)]Wherein a is1、b1、c1Respectively detected pollutants SO in the outlet flue gas2、NoxConcentration of other contaminants, a0、b0、c0Respectively, pollutant SO of discharge requirement2、NoxAnd the concentration limit value of other pollutants, Q is the flue gas flow in the main flue gas purification system, m0、m1、m2SO of each desulfurizing tower and denitration tower respectively2、NoxThe removal rate of other pollutants, and simultaneously ensures P>P1P is a head of the circulating fan, P1The pressure drop of the external circulation air pumping system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110405147.9A CN112915737A (en) | 2021-04-15 | 2021-04-15 | Industrial tail gas pollutant removal system and removal method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110405147.9A CN112915737A (en) | 2021-04-15 | 2021-04-15 | Industrial tail gas pollutant removal system and removal method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112915737A true CN112915737A (en) | 2021-06-08 |
Family
ID=76174409
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110405147.9A Pending CN112915737A (en) | 2021-04-15 | 2021-04-15 | Industrial tail gas pollutant removal system and removal method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112915737A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114307482A (en) * | 2022-01-04 | 2022-04-12 | 常山孚康氟化钙有限公司 | Fluorite powder recycling system |
-
2021
- 2021-04-15 CN CN202110405147.9A patent/CN112915737A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114307482A (en) * | 2022-01-04 | 2022-04-12 | 常山孚康氟化钙有限公司 | Fluorite powder recycling system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106382145B (en) | A kind of exhaust treatment system and control method based on NTP technology | |
| CN104906931A (en) | Nitrogen oxide waste gas treatment method and treatment system thereof | |
| CN112915737A (en) | Industrial tail gas pollutant removal system and removal method | |
| CN215782609U (en) | Industrial tail gas pollutant removal system | |
| CN107008128A (en) | Denitrating flue gas processing system and method based on ozone low-temperature oxidation | |
| CN207356882U (en) | Ozone denitrification apparatus | |
| CN101920166B (en) | Denitration method for desulfurization postposition | |
| CN105879566B (en) | NO in the medium barrier discharging induced reduction removing flue gas of one kindxMethod and apparatus | |
| CN206522172U (en) | A kind of exhaust treatment system based on NTP technologies | |
| CN209378764U (en) | Can NO_x Reduction by Effective dangerous waste incineration tail gas processing unit | |
| CN207076345U (en) | For removing the marine exhaust processing unit of sulfur and nitrogen oxides simultaneously | |
| CN205182493U (en) | A absorption tower device for SOx/NOx control | |
| CN211586005U (en) | Ammonia escape control system | |
| CN208436656U (en) | A kind of gas furnace desulphurization and dust removal integrated device | |
| CN205965465U (en) | Sintering, pelletizing flue gas denitration device | |
| CN211753933U (en) | Carbon monoxide and nitrogen oxide co-processing system | |
| CN107138045B (en) | Ship exhaust gas treatment device for simultaneously removing sulfur oxides and nitrogen oxides | |
| CN205627569U (en) | Comprehensive denitration treatment system of flue gas | |
| CN111068502A (en) | Ammonia escape control system and control method | |
| CN215782632U (en) | Industrial tail gas circulation treatment system | |
| CN216987058U (en) | Treatment system for improving tail gas nitrogen oxides under relatively low temperature condition | |
| CN214319699U (en) | Exhaust-gas treatment is with jointly SOx/NOx control device | |
| CN219186469U (en) | Tail gas treatment system of sulfur recycling device | |
| CN205095626U (en) | Flue gas purification device | |
| CN211302628U (en) | Ship tail gas treatment system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |