CN110824097A - System and method for evaluating CO oxidation catalyst of sintering flue gas - Google Patents
System and method for evaluating CO oxidation catalyst of sintering flue gas Download PDFInfo
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Abstract
The invention discloses a system for evaluating a CO oxidation catalyst in sintering flue gas, which comprises: the simulated sintering flue gas supply module comprises a gas supply unit, a simulated flue gas distribution unit and a gas mixing unit, wherein the gas supply unit is connected with the simulated flue gas distribution unit, and the simulated flue gas distribution unit is connected with the gas mixing unit; the simulated sintering flue gas supply module is connected with the CO oxidation catalytic removal module; the tail gas adsorption treatment module is connected with the CO oxidation catalytic removal module; the invention adopts an accurate gas flow control system, and can accurately adjust and control the components and flow of the simulated flue gas; in addition, the catalytic reactor adopts a double-layer pipe wall design, the problems of flue gas heating and catalytic reaction are solved, a gas heating device is not required to be arranged before simulated flue gas enters the catalytic reactor, and the process flow is simplified.
Description
Technical Field
The invention belongs to the technical field of performance evaluation of a CO oxidation catalyst for sintering flue gas, and particularly relates to a system and a method for evaluating the CO oxidation catalyst for sintering flue gas.
Background
The sintering flue gas contains a large amount of sulfur dioxide (SO)2) Nitrogen oxides (NOx), dioxins, CO and other toxic and harmful gases, so the treatment of sintering flue gas is one of the important environmental protection treatments in the steel industryAnd (4) heavy. With the continuous upgrade of the national environmental protection policy, particularly, the ministry of the nation promulgates the opinion on the promotion of the ultra-low emission of the steel industry (the opinion is hereinafter referred to as the opinion) in 2019 in 4 months, and defines sulfur dioxide (SO)2) And ultra-low emission standard for nitrogen oxides (NOx), sulfur dioxide (SO)2) And ultra-low emission of nitrogen oxides (NOx) are also a critical task for environmental protection governance in the current steel sintering industry. Although there is no clear requirement in the current opinion, it is believed that the ultra-low emission of CO gas will become one of the important contents for sintering flue gas treatment in the future with the continuous deepening of environmental protection treatment in the steel sintering industry.
Due to the characteristics of sintering flue gas, CO gas in the sintering flue gas is difficult to treat by combustion and the like, and CO oxidation catalysis is a more effective technical path. The basic principle of CO oxidation catalysis is to make CO in the sintering flue gas react with O2 at a lower temperature to generate CO2The core of the catalytic reaction is the CO oxidation catalyst.
The CO oxidation catalyst is a mature application technology in the fields of automobile exhaust treatment, petrochemical industry, fuel cell raw material gas purification, coal mines, military submarines, household air purification, household natural gas stoves and the like, and has a remarkable CO oxidation catalytic effect. In the field of ferrous metallurgy, the waste gas treatment by using a CO oxidation catalysis technology still belongs to a blank, and is related to various factors such as the current requirement of environmental protection policy, the characteristics of large sintering smoke gas amount and complex components.
Therefore, in the process of implementing the technical solutions in the embodiments of the present application, the applicant of the present invention finds that the existing methods for evaluating CO oxidation catalysts have at least the following technical problems:
at present, an effective detection and evaluation method aiming at the characteristics of iron ore sintering flue gas CO oxidation catalyst is lacked, and the CO oxidation catalyst product is difficult to adapt to the sintering flue gas condition and the product quality is difficult to guarantee.
In summary, we propose a system and a method for evaluating a CO oxidation catalyst in sintering flue gas.
Disclosure of Invention
The invention aims to provide a system and a method for evaluating a CO oxidation catalyst in sintering flue gas, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the following technical scheme: a sintering flue gas CO oxidation catalyst evaluation system comprises: the simulated sintering flue gas supply module comprises a gas supply unit, a simulated flue gas distribution unit and a gas mixing unit, wherein the gas supply unit is connected with the simulated flue gas distribution unit, and the simulated flue gas distribution unit is connected with the gas mixing unit;
the simulated sintering flue gas supply module is connected with the CO oxidation catalytic removal module;
the tail gas adsorption treatment module is connected with the CO oxidation catalytic removal module;
and the simulated sintering flue gas supply module is connected with the computer control module, and the CO oxidation catalytic removal module is connected with the computer control module.
Further, the gas supply unit comprises a CO gas cylinder, an air gas cylinder and N2Gas cylinder, CO2Gas cylinder, SO2The simulated smoke distribution unit comprises a pressure reduction device, a flowmeter and a one-way valve, and the CO gas cylinder, the air gas cylinder and the N gas cylinder2Gas cylinder, CO2Gas cylinder, SO2The gas cylinder and the NO gas cylinder are connected with the simulated smoke gas distribution unit through a pressure reducing device, a flowmeter and a one-way valve, the gas mixing unit comprises a stainless steel pipeline, and gas coming out of the smoke gas simulated gas distribution unit is connected with the gas mixing unit through the stainless steel pipeline and the one-way valve.
Furthermore, a mass flowmeter is adopted as a flowmeter in the simulated flue gas distribution unit, and an anticorrosive layer is covered on the inner side of a stainless steel pipeline in the gas mixing unit.
Further, the CO oxidation catalytic removal module comprises a catalytic reactor, a CO oxidation catalyst and an electric heating furnace.
Furthermore, the catalytic reactor is designed to be a double-layer pipe wall, the inner layer pipe wall and the outer layer pipe wall are communicated at the bottom of the reactor, simulated flue gas enters an annular gap between the inner side pipe wall and the outer side pipe wall from an upper gas inlet and flows from top to bottom, the simulated flue gas flows into the inner layer pipe from bottom to top after reaching the bottom of the reactor, then passes through a CO oxidation catalyst, the CO oxidation catalyst is any one of a noble metal catalyst and a non-noble metal catalyst, the CO oxidation catalyst is of a honeycomb porous block structure, and the size of the CO oxidation catalyst is 40mm multiplied by 50mm or 40mm multiplied by 100 mm.
Further, the tail gas adsorption treatment module comprises an adsorption material and a shell, wherein the adsorption material in the tail gas adsorption treatment module is activated carbon, and the shell in the tail gas adsorption treatment module is made of stainless steel.
Further, the computer control module comprises a smoke component sensor, a temperature sensor, a sensor signal converter and a computer control system.
Furthermore, the flue gas component sensors respectively detect simulated flue gas components on line in real time at the inlet and the outlet of the catalytic reactor, the temperature sensors detect the flue gas temperature on line in real time above the CO oxidation catalyst, the type of the temperature sensors is K-type thermocouples, the thermocouples are protected by high-purity corundum sleeves, and the computer control system comprises an acquisition module, an analysis module and a storage module.
The invention also provides an evaluation method of the sintering flue gas CO oxidation catalyst, which comprises the following steps:
s1, obtaining sintering simulation smoke; according to the preset sintering simulated flue gas proportion, the gas supply unit and the simulated flue gas distribution unit are adjusted to obtain CO, air and N with corresponding flow rates2、CO2、SO2And NO, then introducing each component gas into a gas mixing unit, and fully and uniformly mixing to obtain sintering simulation flue gas;
s2, testing the catalytic efficiency and the anti-poisoning property of the CO oxidation catalyst; heating the electric heating furnace to a specified temperature, keeping the temperature constant for 30min, then simulating the introduction of flue gas into a catalytic reactor, and testing the catalytic efficiency and the anti-poisoning property of the CO oxidation catalyst;
s3, monitoring the components and the temperature of the flue gas before and after the reaction in real time, and analyzing the catalytic efficiency: the computer control module detects the components and the temperature of the flue gas before and after the reaction in real time on line and analyzes the catalytic efficiency;
s4, purifying and discharging the tail gas; after the simulated flue gas comes out of the catalytic reaction tube, the simulated flue gas enters a tail gas adsorption module for purification treatment, and finally the tail gas is discharged to the outdoor atmosphere.
Furthermore, the flow of the sintering simulation smoke gas proportion is 10-50L/min, the temperature of the simulation smoke gas is 150-350 ℃, the components and the temperature of the smoke gas before and after the reaction are monitored in real time, when the catalytic efficiency is analyzed, the detection result is recorded and analyzed through data acquisition and processing software on a computer control system, and various recorded data are stored at the same time.
The invention has the technical effects and advantages that: compared with the prior art, the system and the method for evaluating the CO oxidation catalyst of the sintering flue gas have the following advantages that:
1. the invention adopts an accurate gas flow control system, and can accurately adjust and control the components and flow of the simulated flue gas; in addition, the catalytic reactor adopts a double-layer pipe wall design, the problems of flue gas heating and catalytic reaction are solved, a gas heating device is not required to be arranged before simulated flue gas enters the catalytic reactor, and the process flow is simplified;
2. the device of the invention has simple operation, can realize long-term on-line detection, greatly reduces the long-term detection cost due to small gas consumption, and has strong popularization value and good development prospect.
Drawings
FIG. 1 is a block diagram of the circuit of the present invention;
FIG. 2 is a block diagram of a circuit of a simulated sintering flue gas supply module according to the present invention;
FIG. 3 is a block diagram of a computer control system according to the present invention;
fig. 4 is a flow chart in the present invention.
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. The specific embodiments described herein are merely illustrative of the invention and do not delimit the invention. 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.
Example 1
The invention provides a system for evaluating a CO oxidation catalyst in sintering flue gas, which is shown in figures 1-4 and comprises: the simulated sintering flue gas supply module comprises a gas supply unit, a simulated flue gas distribution unit and a gas mixing unit, wherein the gas supply unit is connected with the simulated flue gas distribution unit, and the simulated flue gas distribution unit is connected with the gas mixing unit;
the simulated sintering flue gas supply module is connected with the CO oxidation catalytic removal module;
the tail gas adsorption treatment module is connected with the CO oxidation catalytic removal module;
and the simulated sintering flue gas supply module is connected with the computer control module, and the CO oxidation catalytic removal module is connected with the computer control module.
The invention specifically comprises the following steps: the gas supply unit comprises a CO gas cylinder, an air gas cylinder and N2Gas cylinder, CO2Gas cylinder, SO2The simulated smoke distribution unit comprises a pressure reduction device, a flowmeter and a one-way valve, and the CO gas cylinder, the air gas cylinder and the N gas cylinder2Gas cylinder, CO2Gas cylinder, SO2The gas cylinder and the NO gas cylinder are connected with the simulated smoke gas distribution unit through a pressure reducing device, a flowmeter and a one-way valve, the gas mixing unit comprises a stainless steel pipeline, and gas coming out of the smoke gas simulated gas distribution unit is connected with the gas mixing unit through the stainless steel pipeline and the one-way valve.
The invention specifically comprises the following steps: the flow meter in the simulated flue gas distribution unit adopts a mass flow meter, and the inner side of a stainless steel pipeline in the gas mixing unit is covered with an anticorrosive coating; by adopting the mass flow meter, the precision of the gas flow can be ensured.
The invention specifically comprises the following steps: the CO oxidation and catalysis removal module comprises a catalytic reactor, a CO oxidation catalyst and an electric heating furnace.
The invention specifically comprises the following steps: the catalytic reactor is designed to be a double-layer pipe wall, the inner layer pipe wall and the outer layer pipe wall are communicated at the bottom of the reactor, simulated flue gas enters an annular gap between the inner side pipe wall and the outer side pipe wall from an upper gas inlet, the simulated flue gas flows from top to bottom, the simulated flue gas flows into the inner layer pipe after reaching the bottom of the reactor, the flow direction is from bottom to top, and then the simulated flue gas passes through a CO oxidation catalyst, wherein the CO oxidation catalyst is any one of a noble metal catalyst and a non-noble metal catalyst, the CO oxidation catalyst is of a honeycomb porous block structure, and the size of the CO oxidation catalyst is 40mm multiplied by 50mm or 40mm multiplied by 100 mm; through the arrangement, the double-layer pipe wall of the catalytic reactor is designed to ensure that simulated flue gas is heated to a specified temperature before passing through the CO oxidation catalyst, the noble metal series can be Pt-Pd series catalysts, single Pt series catalysts and single Pd series catalysts, the non-noble metal series can be Cu-Mn series catalysts, the CO oxidation catalysts are tightly attached to the inner layer pipe wall through the structural design, no gap is ensured to be reserved, the situation that the simulated flue gas is directly discharged without passing through the CO oxidation catalysts is avoided, the evaluation result is influenced, meanwhile, the CO oxidation catalysts are located in the middle of a constant temperature area, and the bottom of the catalytic reactor is located in the constant temperature area to ensure the preheating effect of the simulated flue gas.
The invention specifically comprises the following steps: the tail gas adsorption treatment module comprises an adsorption material and a shell, wherein the adsorption material in the tail gas adsorption treatment module is activated carbon, and the shell in the tail gas adsorption treatment module is made of stainless steel.
The invention specifically comprises the following steps: the computer control module comprises a smoke component sensor, a temperature sensor, a sensor signal converter and a computer control system.
The invention specifically comprises the following steps: the system comprises a catalytic reactor, a computer control system and a computer, wherein the catalytic reactor comprises a CO oxidation catalyst, a flue gas component sensor, a temperature sensor, a collecting module, an analyzing module and a storage module, the flue gas component sensor is used for detecting simulated flue gas components on line in real time at an inlet and an outlet of the catalytic reactor respectively, the temperature sensor is used for detecting the temperature of the flue gas on line in real time above the CO oxidation catalyst, the thermocouple is protected by a high-purity corundum sleeve, the computer control system comprises the collecting module, the analyzing module and the storage module, the temperature sensor is used for detecting the temperature of the flue gas on line in real time above the CO oxidation catalyst.
The invention also provides an evaluation method of the sintering flue gas CO oxidation catalyst as shown in the figures 1-4, which comprises the following steps:
s1, obtaining sintering simulation smoke; according to the preset sintering simulated flue gas proportion, the gas supply unit and the simulated flue gas distribution unit are adjusted to obtain CO, air and N with corresponding flow rates2、CO2、SO2And NO, then introducing each component gas into a gas mixing unit, and fully and uniformly mixing to obtain sintering simulation flue gas;
s2, testing the catalytic efficiency and the anti-poisoning property of the CO oxidation catalyst; heating the electric heating furnace to a specified temperature, keeping the temperature constant for 30min, then simulating the introduction of flue gas into a catalytic reactor, and testing the catalytic efficiency and the anti-poisoning property of the CO oxidation catalyst;
s3, monitoring the components and the temperature of the flue gas before and after the reaction in real time, and analyzing the catalytic efficiency; the computer control module detects the components and the temperature of the flue gas before and after the reaction in real time on line and analyzes the catalytic efficiency;
s4, purifying and discharging the tail gas; after the simulated flue gas comes out of the catalytic reaction tube, the simulated flue gas enters a tail gas adsorption module for purification treatment, and finally the tail gas is discharged to the outdoor atmosphere.
The invention specifically comprises the following steps: the flow rate of the sintering simulation smoke gas proportion is 10-50L/min, the temperature of the simulation smoke gas is 150-350 ℃, the components and the temperature of the smoke gas before and after the reaction are monitored in real time, when the catalytic efficiency is analyzed, the detection result is recorded and analyzed through data acquisition and processing software on a computer control system, and various recorded data are stored at the same time
The working principle is as follows: firstly, according to the preset sintering simulated flue gas proportion, the gas supply unit and the simulated flue gas distribution unit are adjusted to obtain CO, air and N with corresponding flow rates2、CO2、SO2And NO, then each component gas is introduced into a gas mixing unit to be fully and uniformly mixed to obtain sintering simulation smoke, then the sintering simulation smoke is heated to a specified temperature by an electric heating furnace and kept at the constant temperature for 30min, then the simulation smoke is introduced into a catalytic reactor to test the catalytic efficiency and the anti-poisoning property of a CO oxidation catalyst, meanwhile, a computer control module detects the components and the temperature of the smoke before and after the reaction in real time on line and analyzes the catalytic efficiency, finally, the simulation smoke enters a tail gas adsorption module for purification treatment after coming out of a catalytic reaction pipe, and finally, the tail gas is discharged into the outdoor atmosphere, so that the main component content in the sintering smoke can be well simulated, the flow control of the smoke components is accurate, the equipment and the process flow are simple and easy to operate, meanwhile, the catalytic reactor adopts a double-layer pipe wall design, and the problems of smoke heating and, and a computer control system is used for recording and analyzing the detection result in real time, and the detection and analysis process is stable and reliable and has strong operability.
Example 2
The invention also provides a system and a method for evaluating the CO oxidation catalyst of the sintering flue gas as shown in the figures 1 to 4, which are different from the first embodiment in that:
the system and the method for evaluating the CO oxidation catalyst for the sintering flue gas are adopted to evaluate the CO oxidation catalyst for the sintering flue gas, the CO oxidation catalyst with the size of 40mm multiplied by 50mm is placed in a CO catalytic reactor, and the active components of the catalyst are Pt and Pd; the temperature of the simulated sintering flue gas is 260 ℃, the flow rate of the flue gas is 30L/min, and the concentration of CO in the flue gas is 1%. By analyzing the detection result, the CO catalytic efficiency detected by the evaluation method provided by the embodiment is 87%.
Example 3
The invention also provides a system and a method for evaluating the CO oxidation catalyst of the sintering flue gas as shown in the figures 1 to 4, which are different from the first embodiment in that:
the system and the method for evaluating the CO oxidation catalyst for the sintering flue gas are adopted to evaluate the CO oxidation catalyst for the sintering flue gas, the CO oxidation catalyst with the size of 40mm multiplied by 100mm is placed in a CO catalytic reactor, and the active components of the catalyst are Pt: the temperature of the simulated sintering flue gas is 290 ℃, the flow rate of the flue gas is 50L/min, and the concentration of CO in the flue gas is 0.7%. By analyzing the detection result, the CO catalytic efficiency detected by the evaluation method provided by the embodiment is 82%.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A sintering flue gas CO oxidation catalyst evaluation system is characterized by comprising: the simulated sintering flue gas supply module comprises a gas supply unit, a simulated flue gas distribution unit and a gas mixing unit, wherein the gas supply unit is connected with the simulated flue gas distribution unit, and the simulated flue gas distribution unit is connected with the gas mixing unit;
the simulated sintering flue gas supply module is connected with the CO oxidation catalytic removal module;
the tail gas adsorption treatment module is connected with the CO oxidation catalytic removal module;
and the simulated sintering flue gas supply module is connected with the computer control module, and the CO oxidation catalytic removal module is connected with the computer control module.
2. The system for evaluating the CO oxidation catalyst in the sintering flue gas as claimed in claim 1, wherein: the gas supply unit comprises a CO gas cylinder, an air gas cylinder and N2Gas cylinder, CO2Gas cylinder, SO2The simulated smoke distribution unit comprises a pressure reduction device, a flowmeter and a one-way valve, and the CO gas cylinder, the air gas cylinder and the N gas cylinder2Gas cylinder, CO2Gas cylinder, S02The gas cylinder and the N0 gas cylinder are connected with the simulated flue gas distribution unit through a pressure reducing device, a flowmeter and a one-way valve, the gas mixing unit comprises a stainless steel pipeline, and the gas coming out of the flue gas simulated distribution unit is connected with the gas mixing unit through the stainless steel pipeline and the one-way valve.
3. The system for evaluating the CO oxidation catalyst in the sintering flue gas as claimed in claim 2, wherein: the flow meter in the simulated flue gas distribution unit adopts a mass flow meter, and the inner side of the stainless steel pipeline in the gas mixing unit is covered with a metal-proof layer.
4. The system for evaluating the CO oxidation catalyst in the sintering flue gas as claimed in claim 1, wherein: the CO oxidation and catalysis removal module comprises a catalytic reactor, a CO oxidation catalyst and an electric heating furnace.
5. The system for evaluating the CO oxidation catalyst in the sintering flue gas as claimed in claim 4, wherein: the catalytic reactor is designed to be a double-layer pipe wall, the inner layer pipe wall and the outer layer pipe wall are communicated at the bottom of the reactor, simulated flue gas enters an annular gap between the inner side pipe wall and the outer side pipe wall from an upper gas inlet, the simulated flue gas flows from top to bottom, the simulated flue gas flows into the inner layer pipe after reaching the bottom of the reactor, the flow direction of the simulated flue gas is from bottom to top, and then the simulated flue gas passes through a CO oxidation catalyst, wherein the CO oxidation catalyst is any one of a noble metal catalyst and a non-noble metal catalyst, the CO oxidation catalyst is of a honeycomb porous block structure, and the size of the CO oxidation catalyst is 40mm multiplied by 50mm or 40mm multiplied by 40 mm.
6. The system for evaluating the CO oxidation catalyst in the sintering flue gas as claimed in claim 1, wherein: the tail gas adsorption treatment module comprises an adsorption material and a shell, wherein the adsorption material in the tail gas adsorption treatment module is activated carbon, and the shell in the tail gas adsorption treatment module is made of stainless steel.
7. The system for evaluating the CO oxidation catalyst in the sintering flue gas as claimed in claim 1, wherein: the computer control module comprises a smoke component sensor, a temperature sensor, a sensor signal converter and a computer control system.
8. The system for evaluating the CO oxidation catalyst in the sintering flue gas as claimed in claim 7, wherein: the system comprises a catalytic reactor, a temperature sensor, a computer control system and a computer, wherein the catalytic reactor is used for introducing CO oxidation catalyst, the temperature sensor is used for detecting simulated flue gas components on line in real time at an inlet and an outlet of the catalytic reactor respectively, the temperature sensor is used for detecting the temperature of the flue gas on line in real time above the CO oxidation catalyst, the type of the temperature sensor is K-type thermocouple, the thermocouple is protected by a high-purity corundum sleeve, and the computer control system comprises an acquisition module.
9. The method for evaluating the CO oxidation catalyst of the sintering flue gas according to any one of claims 1 to 8, characterized by comprising the following steps:
s1, obtaining sintering simulation smoke; adjusting gas supply according to preset sintering simulation smoke gas proportionThe unit and the simulated smoke gas distribution unit obtain CO, air and N with corresponding flow2、CO2、SO2And NO, then introducing each component gas into a gas mixing unit, and fully and uniformly mixing to obtain sintering simulation flue gas;
s2, testing the catalytic efficiency and the anti-poisoning property of the CO oxidation catalyst; heating the electric heating furnace to a specified temperature, keeping the temperature constant for 30min, then simulating the introduction of flue gas into a catalytic reactor, and testing the catalytic efficiency and the anti-poisoning property of the CO oxidation catalyst;
s3, monitoring the components and the temperature of the flue gas before and after the reaction in real time, and analyzing the catalytic efficiency; the computer control module detects the components and the temperature of the flue gas before and after the reaction in real time on line and analyzes the catalytic efficiency;
s4, purifying and discharging the tail gas; after the simulated flue gas comes out of the catalytic reaction tube, the simulated flue gas enters a tail gas adsorption module for purification treatment, and finally the tail gas is discharged to the outdoor atmosphere.
10. The method for evaluating the CO oxidation catalyst for the sintering flue gas as claimed in claim 9, wherein the method comprises the following steps: the flow of the sintering simulation smoke proportion is 10-50L/min, the temperature of the simulation smoke is 150-350 ℃, the components and the temperatures of the smoke before and after the reaction are monitored in real time, when the catalytic efficiency is analyzed, the detection result is recorded and analyzed through data acquisition and processing software on a computer control system, and various recorded data are stored at the same time.
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