CN113634123B - Tail gas treatment device - Google Patents
Tail gas treatment device Download PDFInfo
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- CN113634123B CN113634123B CN202111010829.6A CN202111010829A CN113634123B CN 113634123 B CN113634123 B CN 113634123B CN 202111010829 A CN202111010829 A CN 202111010829A CN 113634123 B CN113634123 B CN 113634123B
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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
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9431—Processes characterised by a specific device
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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Abstract
The invention discloses a tail gas treatment device. The tail gas treatment device includes: the device comprises a control module, a tail gas collecting module, a particulate matter recycling module and a tail gas purifying module; the tail gas collecting module is used for collecting the gas to be purified and measuring the flow rate of the gas to be purified and the content of nitrogen oxide in the gas to be purified; the particle recovery module is used for filtering the gas to be purified and collecting particles of the gas to be purified; the tail gas purification module is used for treating gas pollutants in the gas to be purified after filtration; the control module is used for controlling the particle recovery module to filter and collect particles of the gas to be purified and controlling the tail gas purification module to treat gas pollutants in the gas to be purified. The tail gas treatment device provided by the invention can be used for treating gas pollutants in the tail gas and recycling solid pollutants in the tail gas.
Description
Technical Field
The invention relates to the technical field of automobile detection, in particular to an exhaust gas treatment device.
Background
The automobile exhaust contains particles, nitric oxide and other toxic gases, and when the automobile is subjected to environmental inspection, the engine of the motor vehicle can be switched to different working states in a short time, so that the diesel oil in the automobile is incompletely reacted to generate more pollutants. At present, the detection device of the motor vehicle detection station can not purify the tail gas after detection after analyzing and detecting the tail gas, and can only directly discharge the tail gas into the air, so that the environment around the vehicle detection station is seriously influenced, and the physical health of workers and surrounding residents of the vehicle detection station is harmed.
Although the existing gas purification technology can purify gas components in vehicle exhaust, for example, patent CN209752434U discloses that a stirring shaft and a stirring blade are driven by a motor to rotate so as to achieve the effect of purifying exhaust; patent CN108970401A discloses spraying particulate matter in a tank; patent CN111379614A discloses purify tail gas through the tail gas purifier in the tail gas purification module to add the catalyst through the catalyst and carry out catalytic treatment to tail gas, the rethread ceramic catalyst converter carries out secondary treatment to tail gas. However, the above-mentioned patents related to the exhaust gas treatment only purify the gas pollutants in the exhaust gas, and do not properly treat the particulate matters in the exhaust gas.
Therefore, there is a need for a tail gas treatment technology capable of treating both solid pollutants and gaseous pollutants in the tail gas.
Disclosure of Invention
The invention aims to provide a tail gas treatment device, which can treat gas pollutants in tail gas and can recycle solid pollutants in the tail gas.
In order to achieve the purpose, the invention provides the following scheme:
an exhaust gas treatment device comprising:
the device comprises a control module, an exhaust gas collecting module, a particulate matter recycling module and an exhaust gas purifying module;
the tail gas collection module, the particulate matter recovery module and the tail gas purification module are all connected with the control module;
the tail gas collection module is connected with the particulate matter recovery module; the tail gas collecting module is used for collecting gas to be purified and measuring the flow rate of the gas to be purified and the content of nitrogen oxide in the gas to be purified;
the particulate matter recovery module is connected with the tail gas purification module; the particle recovery module is used for filtering the gas to be purified and collecting particles of the gas to be purified;
the tail gas purification module is used for treating gas pollutants in the gas to be purified after filtration;
the control module is used for controlling the tail gas collection module to collect the gas to be purified, controlling the particulate matter recovery module to filter the gas to be purified and collecting particulate matters of the gas to be purified; the control module is also used for controlling the tail gas collection module to treat gas pollutants according to the flow of the gas to be purified and the content of nitrogen oxides in the gas to be purified.
Optionally, the exhaust gas collection module specifically includes:
the system comprises a tail gas collecting pipe, a first nitrogen-oxygen sensor, a flowmeter and a negative pressure fan;
the negative pressure fan is arranged at the air outlet of the tail gas collecting pipe; the negative pressure fan is used for collecting the gas to be purified into the tail gas collecting pipe;
the first nitrogen-oxygen sensor is arranged in the tail gas collecting pipe; the first nitrogen-oxygen sensor is connected with the control module; the first nitrogen-oxygen sensor is used for measuring the content of nitrogen oxides in the gas to be purified;
the flowmeter is connected with the tail gas collecting pipe; the flow meter is connected with the control module; the flow meter is used for measuring the flow rate of the gas to be purified.
Optionally, the particulate matter recovery module specifically includes:
the particle trap, the pressure measurement submodule, the particle baffle valve, the particle back-flushing submodule and the particle collection submodule;
the gas inlet of the particle trap is connected with the gas outlet of the tail gas collecting pipe; the particle catcher is used for filtering the gas to be purified;
the pressure measurement submodule is connected with the control module; the pressure measurement sub-module is arranged at the air inlet of the particle trap and the air outlet of the particle trap; the pressure measurement sub-module is used for detecting the pressure at the air inlet of the particle catcher and the pressure at the air outlet of the particle catcher; the control module is used for starting the particulate matter blowback sub-module and the particulate matter collection sub-module when the pressure difference between the air inlet of the particulate trap and the air outlet of the particulate trap is greater than or equal to a pressure difference threshold value;
the particle baffle valve is arranged at the air inlet of the particle catcher; the particle baffle valve is used for controlling the gas to be purified to enter the particle trap from the exhaust gas collecting pipe in a one-way mode;
the particle back-blowing sub-module is connected with the control module; the particle back-blowing sub-module is arranged at the air outlet of the particle trap; the particle back-blowing sub-module is used for back-blowing the particles trapped by the particle trap to the particle baffle valve when the pressure difference is greater than or equal to the pressure difference threshold;
the particle collection submodule is connected with the control module; the particle collecting sub-module is arranged at the air inlet of the particle catcher; the particle collecting submodule is used for collecting particles blown back to the particle baffle valve when the pressure difference is larger than or equal to the pressure difference threshold value.
Optionally, the particulate matter collecting submodule specifically includes:
the particle collecting pipe, the particle collecting control valve, the particle suction fan and the water tank;
the inlet of the particle collecting pipe is arranged at the air outlet end of the particle baffle valve; the outlet of the particle collecting pipe is connected with the inlet of the particle sucking fan; the outlet of the particle suction fan is positioned in the water tank; the particle collection control valve is arranged on the particle collection pipe; the particle collection control valve and the particle suction fan are both connected with the control module;
the particle collection control valve is used for opening when the pressure difference is greater than or equal to the pressure difference threshold value;
and the particle suction fan is used for collecting the particles blown back to the particle baffle valve into the water tank when the pressure difference is greater than or equal to the pressure difference threshold value.
Optionally, the exhaust gas purification module specifically includes:
the system comprises a heating submodule, a tail gas circulation control valve and a plurality of tail gas purification submodules;
the air inlet of the heating submodule is connected with the air outlet of the particle catcher; the heating submodule is connected with the control module; the heating submodule is used for heating the filtered gas to be purified;
the air inlets of the tail gas purification submodules are connected with the air outlets of the heating submodules; the tail gas purification sub-module is used for treating gas pollutants in the gas to be purified; the gaseous pollutants include carbon monoxide, hydrocarbons and nitrogen oxides;
the exhaust gas circulation control valve is arranged at the air inlets of the plurality of exhaust gas purification sub-modules; the tail gas circulation control valve is connected with the control module; the tail gas circulation control valve is used for controlling the opening number of the tail gas purification submodules; the control module is used for controlling the tail gas circulation control valve according to the flow of the gas to be purified.
Optionally, the exhaust gas purification submodule specifically includes:
an oxidation catalytic converter and a nitrogen oxide treatment unit;
the air inlet of the oxidation catalytic converter is connected with the air outlet of the heating submodule; the oxidation catalytic converter is used for oxidizing carbon monoxide and hydrocarbon in the gas to be purified into carbon dioxide and water;
the gas inlet of the nitrogen oxide treatment unit is connected with the gas outlet of the oxidation catalytic converter; the nitrogen oxide treatment unit is connected with the control module; the nitrogen oxide treatment unit is used for treating nitrogen oxide in the gas to be purified; the control module is used for controlling the injection amount of the urea solution in the nitrogen oxide treatment unit according to the flow rate of the gas to be purified and the content of nitrogen oxide in the gas to be purified.
Optionally, the nitrogen oxide treatment unit specifically includes:
a urea storage and injection subunit, a selective catalytic reducer and an ammonia slip catalyst;
the gas inlet of the selective catalytic reducer is connected with the gas outlet of the oxidation catalytic converter; the urea storage and injection subunit is arranged at an air inlet of the selective catalytic reduction device; the air inlet of the ammonia escape catalyst is connected with the air outlet of the selective catalytic reducer;
the urea storage and injection subunit is connected with the control module; the urea storage and injection subunit is used for storing urea solution and injecting the urea solution into the selective catalytic reduction device according to the injection quantity signal sent by the control module; the urea solution generates ammonia gas in the selective catalytic reducer;
the ammonia gas in the selective catalytic reducer is used for reducing the nitrogen oxides in the gas to be purified into nitrogen gas and water;
the ammonia slip catalyst is used to absorb ammonia gas that has not reacted in the selective catalytic reducer.
Optionally, the tail gas treatment device further comprises:
a second nitrogen oxide sensor;
the second nitrogen oxide sensor is arranged at an air outlet of the ammonia escape catalyst; the second nitrogen oxide sensor is connected with the control module; the second nitrogen oxide sensor is used for measuring the content of nitrogen oxides in the treated tail gas; the control module is used for adjusting the injection amount of the urea solution according to the content of nitrogen oxides in the treated tail gas.
Optionally, the tail gas treatment device further comprises:
a temperature sensor;
the temperature sensors are respectively arranged at the air inlets of the heating sub-modules; the temperature sensor is connected with the control module; the control module is used for controlling the heating temperature of the heating submodule.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a tail gas treatment device, which comprises a control module, a tail gas collection module, a particulate matter recovery module and a tail gas purification module, wherein the tail gas collection module is used for collecting particulate matters; the tail gas collecting module is used for collecting the gas to be purified and measuring the flow rate of the gas to be purified and the content of nitrogen oxide in the gas to be purified; the particle recovery module is used for filtering the gas to be purified and collecting particles of the gas to be purified; the tail gas purification module is used for treating gas pollutants in the gas to be purified after filtration; the control module is used for controlling the particle recovery module to filter and collect particles of the gas to be purified and controlling the tail gas purification module to treat gas pollutants in the gas to be purified. Therefore, the tail gas treatment device provided by the invention can treat gas pollutants in the tail gas and can recycle solid pollutants in the tail gas.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a tail gas treatment device provided in an embodiment of the present invention;
FIG. 2 is a connection diagram of a control module according to an embodiment of the present invention.
Wherein, 1-a tail gas collecting pipe; 2-a flow meter; 3-negative pressure fan; 4-heating the submodule; 5-a tail gas purification submodule; a 6-V cone; 7-a differential pressure transmitter; 8-a spark plug; 9-fuel injector; a 10-oxidation catalytic converter; 11-a particle trap; 12-a selective catalytic reducer; 13-an ammonia slip catalyst; 14-a urea nozzle; 15-a urea pump; 16-a urea tank; 17-particle back-blowing probe; 18-an air compressor; 19-particle flapper valve; 20-a particle collection tube; 21-a particle suction fan; 22-a water tank; 23-a particle collection control valve; 24-a temperature sensor; 25-a front pressure sensor; 26-rear pressure sensor; 27-a first nitroxide sensor; 28-a second nitrogen oxide sensor; 29-a control module; 30-a urea storage and injection subunit; 31-tail gas circulation control valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a tail gas treatment device, which can treat gas pollutants in tail gas and can recycle solid pollutants in the tail gas.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
Examples
Fig. 1 is a schematic structural view of a tail gas treatment device provided in an embodiment of the present invention, fig. 2 is a connection diagram of a control module in an embodiment of the present invention, and as shown in fig. 1 to 2, the present invention provides a tail gas treatment device, including: the device comprises a control module 29, a tail gas collecting module, a particulate matter recycling module and a tail gas purifying module; the tail gas collection module, the particulate matter recovery module and the tail gas purification module are all connected with the control module 29.
The tail gas collection module is connected with the particulate matter recovery module; the tail gas collecting module is used for collecting the gas to be purified and measuring the flow rate of the gas to be purified and the content of nitrogen oxides in the gas to be purified.
The tail gas collection module specifically includes: the system comprises a tail gas collecting pipe 1, a first nitrogen-oxygen sensor 27, a flowmeter 2 and a negative pressure fan 3; the negative pressure fan 3 is arranged at the air outlet of the tail gas collecting pipe 1; the negative pressure fan 3 is used for collecting the gas to be purified into the tail gas collecting pipe 1; the first nitrogen-oxygen sensor 27 is arranged in the tail gas collecting pipe 1; the first nitrogen oxide sensor 27 is connected with the control module 29; the first nitrogen-oxygen sensor 27 is used for measuring the content of nitrogen oxides in the gas to be purified; the flowmeter 2 is connected with the tail gas collecting pipe 1; the flowmeter 2 is connected with the control module 29; the flow meter 2 is used to measure the flow of gas to be cleaned.
Specifically, the flowmeter 2 is a V-cone flowmeter and comprises a V cone 6 and a differential pressure transmitter 7, wherein the V cone 6 is respectively connected with the tail gas collecting pipe 1 and the differential pressure transmitter 7; the differential pressure transmitter 7 is respectively connected with the V cone 6 and the control module 29; when the gas to be purified flows through the V cone 6, the flow state is formed in front of the V cone 6 again, the local gas in front of the V cone 6 contracts, the flow rate is increased, so that pressure difference is generated in front of and behind the V cone 6, the differential pressure transmitter 7 calculates the flow of the gas to be purified through the pressure difference and transmits the signal to the control module 29, the V cone flowmeter has a self-rectification function, the signal stability is good, the limitation of installation conditions is small, and other flowmeters 2 can replace the V cone flowmeter.
The particulate matter recovery module is connected with the tail gas purification module; the particle recovery module is used for filtering the gas to be purified and collecting particles of the gas to be purified.
Particulate matter recovery module specifically includes: the particle trap 11, the pressure measurement submodule, the particle baffle valve 19, the particle back-flushing submodule and the particle collection submodule.
The air inlet of the particle catcher 11 is connected with the air outlet of the tail gas collecting pipe 1; the particle trap 11 is used for filtering the gas to be cleaned.
The pressure measurement submodule is connected with the control module 29; the pressure measurement sub-module is arranged at the air inlet of the particle catcher 11 and the air outlet of the particle catcher 11; the pressure measurement submodule is used for detecting the pressure at the air inlet of the particle catcher 11 and the pressure at the air outlet of the particle catcher 11; the control module 29 is used for starting the particle back-blowing sub-module and the particle collecting sub-module when the pressure difference between the air inlet of the particle catcher 11 and the air outlet of the particle catcher 11 is greater than or equal to the pressure difference threshold value.
The pressure measurement submodule specifically comprises: a front pressure sensor 25 and a rear pressure sensor 26; the front pressure sensor 25 is arranged at the air inlet of the particle catcher 11; the rear pressure sensor 26 is arranged at the air outlet of the particle catcher 11; the front pressure sensor 25 and the rear pressure sensor 26 detect the pressure at the inlet of the particle trap 11 and at the outlet of the particle trap 11, respectively, and transmit the pressure at the inlet of the particle trap 11 and at the outlet of the particle trap 11 to the control module 29.
The particle baffle valve 19 is arranged at the air inlet of the particle catcher 11; the particle baffle valve 19 is used for controlling the gas to be purified to enter the particle catcher 11 from the exhaust gas collecting pipe 1 in a one-way mode.
The particle back-blowing submodule is connected with the control module 29; the particle back-blowing submodule is arranged at the air outlet of the particle catcher 11; the particle back-blowing sub-module is used for back-blowing the particles trapped by the particle catcher 11 to the particle baffle valve 19 when the pressure difference is greater than or equal to the pressure difference threshold value.
The particle back-blowing submodule specifically comprises a particle back-blowing probe 17 and an air compressor 18; the particle back-blowing probe 17 is arranged at the air outlet of the particle catcher 11; the particle back blowing probe 17 is connected with an air compressor 18; the particle back-blowing probe 17 and the air compressor 18 are both connected with the control module 29; the particle back blowing probe 17 and the air compressor 18 are started when the pressure difference is greater than or equal to the pressure difference threshold; the air compressor 18 is used for conveying compressed air to the particle back blowing probe 17; the particle back-blowing probe 17 back-blows the particles in the particle catcher 11 to the particle baffle valve 19 by delivering compressed air.
The particle collection submodule is connected with the control module 29; the particle collecting submodule is arranged at an air inlet of the particle catcher 11; the particle collection submodule is used for collecting particles blown back to the particle baffle valve 19 when the pressure difference is larger than or equal to the pressure difference threshold value.
The particulate matter collection submodule specifically includes: a particle collection pipe 20, a particle collection control valve 23, a particle suction fan 21 and a water tank 22; the inlet of the particle collecting pipe 20 is arranged at the air outlet end of the particle baffle valve 19; the outlet of the particle collecting pipe 20 is connected with the inlet of a particle suction fan 21; the outlet of the particle suction fan 21 is positioned in the water tank 22; a particle collection control valve 23 is provided on the particle collection pipe 20; the particle collection control valve 23 and the particle suction fan 21 are both connected with the control module 29; the particle collection control valve 23 is configured to open when the pressure difference is greater than or equal to a pressure difference threshold; the particle suction fan 21 is used for collecting the particles blown back to the particle baffle valve 19 into the water tank 22 when the pressure difference is greater than or equal to the pressure difference threshold value.
Specifically, the compressed air delivered by the air compressor 18 performs blowback treatment on the particle catcher 11 through the particle blowback probe 17, at this time, the particle collection control valve 23 is opened, and the particle suction fan 21 extracts soot (particulate matter) in a cavity between the particle catcher 11 and the particle baffle valve 19; the soot is drawn along the particle collection tube 20 into the water tank 22 to be mixed with water, and the water is evaporated to collect particles, wherein the collected particles are raw materials for preparing the negative electrode material of the battery.
The tail gas purification module is used for treating gas pollutants in the gas to be purified after filtration.
The tail gas purification module specifically includes: a heating submodule 4, an exhaust gas circulation control valve 31 and a plurality of exhaust gas purification submodules 5.
The air inlet of the heating submodule 4 is connected with the air outlet of the particle catcher 11; the heating submodule 4 is connected with the control module 29; the heating submodule 4 is used for heating the gas to be purified after filtration.
Specifically, the heating submodule 4 specifically includes a spark plug 8 and a fuel injector 9; the spark plug 8 and the fuel injector 9 are both connected with the control module 29, and the control module 29 controls the fuel injection quantity of the fuel injector 9 according to the flow of the gas to be purified; the control module 29 controls the opening of the spark plug 8. The heating submodule 4 heats the input tail gas by adopting a mode of spraying diesel oil and igniting at the same time, so that the gas to be purified reaches the optimal working temperature of the catalyst. The heating submodule 4 may also be other heating means.
The air inlets of the plurality of tail gas purification submodules 5 are connected with the air outlets of the heating submodules 4; the tail gas purification submodule 5 is used for treating gas pollutants in the gas to be purified; gaseous pollutants include carbon monoxide, hydrocarbons, and nitrogen oxides.
The tail gas purification submodule 5 specifically includes: an oxidation catalytic converter 10 and a nitrogen oxide treatment unit;
the air inlet of the oxidation catalytic converter 10 is connected with the air outlet of the heating submodule 4; the oxidation catalytic converter 10 is used for oxidizing carbon monoxide in the gas to be purified to carbon dioxide; the oxidation catalytic converter 10 is also used to convert hydrocarbons in the gas to be purified into carbon dioxide and water.
The air inlet of the nitrogen oxide treatment unit is connected with the air outlet of the oxidation catalytic converter 10; the nitrogen oxide treatment unit is connected with the control module 29; the nitrogen oxide treatment unit is used for treating nitrogen oxides in gas to be purified; the control module 29 is used for controlling the injection amount of the urea solution in the nitrogen oxide treatment unit according to the flow rate of the gas to be purified and the content of nitrogen oxide in the gas to be purified.
The nitrogen oxide treatment unit specifically comprises: a urea storage and injection subunit 30, a selective catalytic reduction 12, and an ammonia slip catalyst 13; the air inlet of the selective catalytic reducer 12 is connected with the air outlet of the oxidation catalytic converter 10; the urea storage and injection subunit 30 is disposed at the air intake of the selective catalytic reduction device 12; the air inlet of the ammonia escape catalyst 13 is connected with the air outlet of the selective catalytic reduction device 12; the urea storage and injection subunit 30 is connected to the control module 29; the urea storage and injection subunit 30 is used for storing urea solution and injecting the urea solution into the selective catalytic reduction device 12 according to an injection quantity signal sent by the control module 29; the urea solution undergoes hydrolysis and pyrolysis reactions in the selective catalytic reducer 12 to generate ammonia gas; the ammonia gas in the selective catalytic reducer 12 is used for reducing the nitrogen oxides in the gas to be purified into nitrogen gas and water; the ammonia slip catalyst 13 serves to absorb ammonia gas that has not reacted in the selective catalytic reducer 12.
The urea storage and injection subunit 30 specifically includes a urea nozzle 14, a urea pump 15, and a urea tank 16; the urea nozzle 14 and the urea pump 15 are both connected with the control module 29; the control module 29 controls the urea nozzle 14 and the urea pump 15 to be turned on.
The exhaust gas circulation control valve 31 is arranged at the air inlets of the plurality of exhaust gas purification submodules 5; the tail gas circulation control valve 31 is connected with the control module 29; the tail gas circulation control valve 31 is used for controlling the opening number of the tail gas purification submodules 5; the control module 29 is used for controlling a tail gas flow control valve 31 according to the flow rate of the gas to be purified.
The control module 29 is used for controlling the tail gas collection module to collect the gas to be purified, controlling the particulate matter recovery module to filter the gas to be purified and collecting the particulate matter of the gas to be purified; the control module 29 is also used for controlling the tail gas collection module to treat the gas pollutants according to the flow rate of the gas to be purified and the content of nitrogen oxides in the gas to be purified.
The tail gas treatment device provided by the invention also comprises a second nitrogen oxide sensor 28; the second nitrogen oxide sensor 28 is provided at the gas outlet of the ammonia slip catalyst 13; the second oxygen sensor 28 is connected with the control module 29; the second nitrogen oxide sensor 28 is used for measuring the content of nitrogen oxides in the treated tail gas; the control module 29 is configured to determine whether the content of nitrogen oxide in the treated exhaust gas meets the emission standard, and adjust the injection amount of the urea solution according to the content of nitrogen oxide in the treated exhaust gas.
The tail gas treatment device provided by the invention further comprises: a temperature sensor 24; the temperature sensors 24 are respectively arranged at the air inlets of the heating submodules 4; the temperature sensor 24 is connected with the control module 29; the control module 29 is used for controlling the heating temperature of the heating submodule 4. In addition, temperature sensors 24 are arranged at the air inlet of the oxidation catalytic converter, the air inlet of the selective catalytic reduction device 12 and the air outlet of the ammonia escape catalytic converter 13, and the temperature sensors 24 are connected with a control module 29; the control module 29 adjusts the heating temperature of the heating submodule 4 in real time according to the temperature signals measured by the temperature sensors 24.
In addition, the sealing gaskets are arranged at the joints of all the parts of the tail gas treatment device, so that the air tightness of the device is ensured; moreover, the gas conveying pipes in the device have the characteristics of high temperature resistance, corrosion resistance, high reliability and the like.
Specifically, in the exhaust gas treatment device provided by the invention, the particle trap is a less-catalytic particle trap, and the particle trap is arranged in front of the heating submodule, because when the gas to be purified reaches a certain temperature, particulate matters (mainly carbon particles) in the gas to be purified react with nitrogen dioxide (nitrogen dioxide is generated by oxidizing nitrogen monoxide) in the exhaust gas, so that a part of the nitrogen dioxide is consumed.
The invention provides a tail gas treatment device, which has the following specific working principle:
the tail gas collecting pipe of the device and the exhaust pipe of the vehicle to be detected are arranged on the same axis, the distance between the air inlet of the tail gas collecting pipe and the exhaust pipe of the vehicle to be detected is 15-20 cm, the negative pressure fan is started, the tail gas flow of the vehicle to be detected passes through the flowmeter and is extracted to the particle catcher by the negative pressure fan to be filtered, particulate matters such as carbon smoke and the like are removed, then the tail gas enters the heating submodule to be heated, a temperature sensor at the air inlet of the heating submodule transmits a measured tail gas temperature signal to the control module, the control module controls the oil injection quantity of an oil injector in the heating submodule, and the input tail gas is heated by adopting a mode of spraying diesel oil and igniting the diesel oil simultaneously, so that the tail gas reaches the optimal working temperature of a catalyst; then, the tail gas is firstly oxidized by an oxidation catalytic converter to oxidize toxic gases (mainly carbon monoxide, hydrocarbon, soluble organic matters and the like) in the tail gas to generate nontoxic carbon dioxide and water; the tail gas after oxidation treatment enters the selective catalytic reduction device, the control module controls the spraying amount of the urea solution according to the flow of the gas to be purified and the content of nitrogen oxides, the urea solution is hydrolyzed and pyrolyzed at high temperature to generate ammonia gas, the nitrogen oxides are reduced into nitrogen gas and water, the unreacted ammonia gas in the selective catalytic reduction device is absorbed and treated by the ammonia escape catalytic reduction device, a second nitrogen oxygen sensor is arranged at the gas outlet of the ammonia escape catalytic reduction device, the second nitrogen oxygen sensor monitors whether the nitrogen oxygen content of the purified tail gas reaches the purification standard, and the purified gas and water are discharged from the gas outlet of the ammonia escape catalytic reduction device. In addition, temperature sensors are arranged at the air inlet of the oxidation catalytic converter, the air inlet of the selective catalytic reduction device and the air outlet of the ammonia escape catalytic converter, and the temperature sensors monitor whether the temperature of the gas to be purified reaches the optimal working temperature of the catalyst in real time and transmit temperature signals to the control module in real time.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In summary, this summary should not be construed to limit the present invention.
Claims (7)
1. The utility model provides a device is administered to tail gas which characterized in that, device is administered to tail gas includes: the device comprises a control module, an exhaust gas collecting module, a particulate matter recycling module and an exhaust gas purifying module;
the tail gas collection module, the particulate matter recovery module and the tail gas purification module are all connected with the control module;
the tail gas collection module is connected with the particulate matter recovery module; the tail gas collecting module is used for collecting gas to be purified and measuring the flow rate of the gas to be purified and the content of nitrogen oxide in the gas to be purified;
the particulate matter recovery module is connected with the tail gas purification module; the particle recovery module is used for filtering the gas to be purified and collecting particles of the gas to be purified;
the tail gas purification module is used for treating gas pollutants in the gas to be purified after filtration;
the control module is used for controlling the tail gas collection module to collect the gas to be purified, and controlling the particle recovery module to filter the gas to be purified and collect particles of the gas to be purified; the control module is also used for controlling the tail gas purification module to treat gas pollutants according to the flow of the gas to be purified and the content of nitrogen oxides in the gas to be purified;
the tail gas collection module specifically comprises: the tail gas collecting pipe, the first nitrogen-oxygen sensor, the flowmeter and the negative pressure fan;
the negative pressure fan is arranged at the air outlet of the tail gas collecting pipe; the negative pressure fan is used for collecting the gas to be purified into the tail gas collecting pipe;
the first nitrogen-oxygen sensor is arranged in the tail gas collecting pipe; the first nitrogen-oxygen sensor is connected with the control module; the first nitrogen-oxygen sensor is used for measuring the content of nitrogen oxides in the gas to be purified;
the flowmeter is connected with the tail gas collecting pipe; the flow meter is connected with the control module; the flow meter is used for measuring the flow of the gas to be purified;
the particulate matter recovery module specifically includes: the particle trap, the pressure measurement submodule, the particle baffle valve, the particle back-flushing submodule and the particle collection submodule;
the gas inlet of the particle catcher is connected with the gas outlet of the tail gas collecting pipe; the particle catcher is used for filtering the gas to be purified;
the pressure measurement submodule is connected with the control module; the pressure measurement sub-module is arranged at the air inlet of the particle trap and the air outlet of the particle trap; the pressure measurement submodule is used for detecting the pressure at the air inlet of the particle catcher and the pressure at the air outlet of the particle catcher; the control module is used for starting the particulate matter blowback sub-module and the particulate matter collection sub-module when the pressure difference between the air inlet of the particulate trap and the air outlet of the particulate trap is greater than or equal to a pressure difference threshold value;
the particle baffle valve is arranged at the air inlet of the particle catcher; the particle baffle valve is used for controlling the gas to be purified to enter the particle trap from the exhaust gas collecting pipe in a one-way mode;
the particle back-blowing sub-module is connected with the control module; the particle back-blowing sub-module is arranged at the air outlet of the particle trap; the particle back-blowing sub-module is used for back-blowing the particles trapped by the particle catcher to the particle baffle valve when the pressure difference is greater than or equal to the pressure difference threshold;
the particle collection submodule is connected with the control module; the particle collecting sub-module is arranged at the air inlet of the particle catcher; the particle collecting submodule is used for collecting particles blown back to the particle baffle valve when the pressure difference is greater than or equal to the pressure difference threshold value; the collected particles are the raw material for preparing the battery negative electrode material.
2. The exhaust gas treatment device according to claim 1, wherein the particulate matter collection submodule specifically comprises: the particle collecting pipe, the particle collecting control valve, the particle suction fan and the water tank;
the inlet of the particle collecting pipe is arranged at the air outlet end of the particle baffle valve; the outlet of the particle collecting pipe is connected with the inlet of the particle sucking fan; the outlet of the particle suction fan is positioned in the water tank; the particle collection control valve is arranged on the particle collection pipe; the particle collection control valve and the particle suction fan are both connected with the control module;
the particle collection control valve is used for opening when the pressure difference is greater than or equal to the pressure difference threshold value;
and the particle suction fan is used for collecting the particles blown back to the particle baffle valve into the water tank when the pressure difference is greater than or equal to the pressure difference threshold value.
3. The exhaust gas treatment device according to claim 1, wherein the exhaust gas purification module specifically comprises: the system comprises a heating submodule, a tail gas circulation control valve and a plurality of tail gas purification submodules;
the air inlet of the heating submodule is connected with the air outlet of the particle catcher; the heating submodule is connected with the control module; the heating submodule is used for heating the filtered gas to be purified;
the air inlets of the tail gas purification submodules are connected with the air outlets of the heating submodules; the tail gas purification sub-module is used for treating gas pollutants in the gas to be purified; the gaseous pollutants include carbon monoxide, hydrocarbons and nitrogen oxides;
the exhaust gas circulation control valve is arranged at the air inlet of the exhaust gas purification sub-modules; the tail gas circulation control valve is connected with the control module; the tail gas circulation control valve is used for controlling the opening number of the tail gas purification submodules; the control module is used for controlling the tail gas circulation control valve according to the flow of the gas to be purified.
4. The exhaust gas treatment device according to claim 3, wherein the exhaust gas purification submodule specifically comprises: an oxidation catalytic converter and a nitrogen oxide treatment unit;
the air inlet of the oxidation catalytic converter is connected with the air outlet of the heating submodule; the oxidation catalytic converter is used for oxidizing carbon monoxide and hydrocarbon in the gas to be purified into carbon dioxide and water;
the air inlet of the nitrogen oxide treatment unit is connected with the air outlet of the oxidation catalytic converter; the nitrogen oxide treatment unit is connected with the control module; the nitrogen oxide treatment unit is used for treating nitrogen oxide in the gas to be purified; the control module is used for controlling the injection amount of the urea solution in the nitrogen oxide treatment unit according to the flow rate of the gas to be purified and the content of nitrogen oxide in the gas to be purified.
5. The exhaust gas treatment device according to claim 4, wherein the nitrogen oxide treatment unit specifically comprises: a urea storage and injection subunit, a selective catalytic reducer and an ammonia slip catalyst;
the air inlet of the selective catalytic reducer is connected with the air outlet of the oxidation catalytic converter; the urea storage and injection subunit is arranged at an air inlet of the selective catalytic reduction device; the air inlet of the ammonia escape catalyst is connected with the air outlet of the selective catalytic reducer;
the urea storage and injection subunit is connected with the control module; the urea storage and injection subunit is used for storing urea solution and injecting the urea solution into the selective catalytic reduction device according to the injection quantity signal sent by the control module; the urea solution generates ammonia gas in the selective catalytic reducer;
the ammonia gas in the selective catalytic reducer is used for reducing the nitrogen oxides in the gas to be purified into nitrogen gas and water;
the ammonia slip catalyst is used to absorb ammonia gas that has not reacted in the selective catalytic reducer.
6. The exhaust gas treatment device according to claim 5, further comprising: a second nitrous oxide sensor;
the second nitrogen oxide sensor is arranged at the gas outlet of the ammonia escape catalyst; the second nitrogen oxide sensor is connected with the control module; the second nitrogen oxide sensor is used for measuring the content of nitrogen oxide in the treated tail gas; the control module is used for adjusting the injection amount of the urea solution according to the content of nitrogen oxides in the treated tail gas.
7. The exhaust gas treatment device according to claim 5, further comprising: a temperature sensor;
the temperature sensor is arranged at the air inlet of the heating sub-module; the temperature sensor is connected with the control module; the control module is used for controlling the heating temperature of the heating submodule according to the temperature measured by the temperature sensor.
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| CN202111010829.6A CN113634123B (en) | 2021-08-31 | 2021-08-31 | Tail gas treatment device |
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| CN202111010829.6A CN113634123B (en) | 2021-08-31 | 2021-08-31 | Tail gas treatment device |
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| CN106178934A (en) * | 2016-07-11 | 2016-12-07 | 佛山杰致信息科技有限公司 | A kind of eco-friendly car vehicle emission measurement system |
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