A tail gas adsorbent evaluation method and application

Abstract

The present invention relates to the technical field of adsorbent evaluation methods, and discloses a tail gas adsorbent evaluation method and application. Under the conditions of a set constant temperature and a constant air velocity, the practicality of the adsorbent is evaluated by obtaining a first intrinsic adsorption amount of the adsorbent in a steady-state simulation test and a first actual adsorption amount in an actual application environment; the first intrinsic adsorption amount is the theoretical adsorption amount of the adsorbent in the steady-state simulation test; within a set temperature range and a volumetric air velocity range, the adaptability of the adsorbent is evaluated by obtaining a second intrinsic adsorption amount of the adsorbent in a steady-state simulation test and a second actual adsorption amount in an actual application environment; the second intrinsic adsorption amount is the theoretical adsorption amount of the adsorbent in the steady-state simulation test. The evaluation method of the present invention obtains the intrinsic adsorption characteristics of the tail gas adsorbent material, evaluates the application stability and real-time adsorption performance of the adsorbent, and then evaluates the performance of the adsorbent material, which is conducive to the selection and optimization of the adsorbent material.

Description

Technical Field

[0001] The present invention relates to the technical field of adsorbent evaluation methods, and in particular to a tail gas adsorbent evaluation method and application. Background Art

[0002] As people pay more attention to environmental protection and emission regulations become increasingly stringent, selective catalytic reduction technology (SCR) has become the most widely used technology for removing NO. X One of the most effective technical means, it has been widely used in engine exhaust treatment, flue gas denitrification and other occasions. There are many studies on SCR catalysts, but there are few unified evaluation indicators. At present, the nitrogen oxide adsorption performance is mainly based on laboratory simulated exhaust evaluation devices, and there is no method to evaluate whether it is consistent with the laboratory simulation evaluation results during actual application. The adsorption environment in which the adsorbent is located has a great influence on the adsorption effect. It will appear that the adsorbent with good simulated exhaust gas evaluation has poor effect in actual application. First, it will cause a waste of results and the results cannot be successfully transformed; second, it is impossible to make targeted improvements to the adsorbent according to the application environment; third, it cannot help researchers select adsorbents with good consistency between simulation and actual application from a large number of adsorbents. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a tail gas adsorbent evaluation method and application. The evaluation method of the present invention obtains the intrinsic adsorption characteristics of the tail gas adsorbent material, evaluates the application stability and real-time adsorption performance of the adsorbent, and then evaluates the quality of the adsorbent performance, which is conducive to the selection and optimization of the adsorbent material.

[0004] The present invention provides a method for evaluating a tail gas adsorbent, comprising the following steps:

[0005] Under the conditions of constant temperature and constant volumetric space velocity, the adsorption capacity of the adsorbent is obtained through steady-state simulation test, and the steady-state intrinsic adsorption characteristic curve of the adsorbent is drawn according to the temperature, volumetric space velocity and adsorption capacity;

[0006] The practicality of the adsorbent is evaluated by obtaining the first intrinsic adsorption amount of the adsorbent and the first actual adsorption amount of the adsorbent in the actual application environment through the steady-state intrinsic adsorption characteristic curve; the first intrinsic adsorption amount is the theoretical adsorption amount of the adsorbent in the steady-state simulation test;

[0007] Within the set temperature range and volume space velocity range, the adsorption capacity of the adsorbent is obtained through transient simulation test, and the transient intrinsic adsorption characteristic curve of the adsorbent is drawn according to the temperature range, volume space velocity range and adsorption capacity;

[0008] The adaptability of the adsorbent is evaluated by obtaining the second intrinsic adsorption capacity of the adsorbent through the transient intrinsic adsorption characteristic curve and the second actual adsorption capacity of the adsorbent in the actual application environment; the second intrinsic adsorption capacity is the theoretical adsorption capacity of the adsorbent in the transient simulation test.

[0009] Furthermore, the first intrinsic adsorption amount of the adsorbent obtained by the steady-state intrinsic adsorption characteristic curve and the first actual adsorption amount of the adsorbent under the actual application environment are used to evaluate the practicality of the adsorbent:

[0010] Steady-state simulation test: Under constant temperature and constant volumetric space velocity test conditions, the adsorption capacity of the adsorbent under the corresponding test is obtained, and the steady-state intrinsic adsorption characteristic curve of the adsorbent is drawn according to the temperature, volumetric space velocity, and adsorption capacity, where the temperature is the X-axis, the volumetric space velocity is the Z-axis, and the adsorption capacity is the Y-axis;

[0011] The adsorbent is installed on an engine bench for testing, and the temperature and volumetric air velocity during the test are made consistent with the test conditions of the steady-state simulation test, so as to obtain the first actual adsorption amount of the adsorbent under the corresponding test conditions; the test conditions during the test are brought into the steady-state intrinsic adsorption characteristic curve of the adsorbent drawn by the steady-state simulation test, and the first intrinsic adsorption amount of the adsorbent under the corresponding test conditions is calculated;

[0012] The first actual adsorption amount obtained is compared with the calculated first intrinsic adsorption amount to obtain the adsorbent calibration coefficient , the adsorbent calibration factor Used to evaluate the practicality of adsorbents under actual application environments at constant temperature and / or constant volumetric space velocity;

[0013] The adsorbent calibration coefficient is positively correlated with the practicality of the adsorbent. The larger the adsorbent calibration coefficient, the better the practicality of the adsorbent.

[0014] Furthermore, the adaptability of the adsorbent is evaluated by obtaining the second intrinsic adsorption capacity of the adsorbent through the transient intrinsic adsorption characteristic curve and the second actual adsorption capacity of the adsorbent under the actual application environment:

[0015] Transient simulation test: Under the test conditions within the set temperature range and volume space velocity range, continuously change the temperature and / or volume space velocity to obtain the adsorption amount of the adsorbent under the corresponding test conditions, and draw the transient intrinsic adsorption characteristic curve of the adsorbent according to the temperature, volume space velocity and adsorption amount, where the temperature is the X-axis, the volume space velocity is the Z-axis, and the adsorption amount is the Y-axis;

[0016] The adsorbent is installed on the engine bench for testing, and the temperature range and volume space velocity range during the test are made consistent with the test conditions of the transient simulation test, so as to obtain the second actual adsorption amount of the adsorbent under the corresponding test conditions; the test conditions during the test are brought into the transient intrinsic adsorption characteristic curve of the adsorbent drawn by the transient simulation test, and the second intrinsic adsorption amount of the adsorbent under the corresponding test conditions is calculated;

[0017] The obtained second actual adsorption amount is compared with the calculated second intrinsic adsorption amount to obtain an adsorbent deviation index k, wherein the deviation index k is used to evaluate the adaptability of the adsorbent in an actual application environment under the condition of continuously changing temperature and / or volume space velocity;

[0018] The adsorbent deviation index is positively correlated with the adaptability of the adsorbent. The larger the adsorbent deviation index, the better the adaptability of the adsorbent.

[0019] It should be understood by those skilled in the art that when evaluating the practicality and adaptability of an adsorbent, it can be done according to actual needs, but the basic requirement for the adsorbent to have good adaptability is that the adsorbent has good practicality. Those skilled in the art can only evaluate the practicality of the adsorbent, or further evaluate the adaptability of the adsorbent when the adsorbent has poor practicality. In the present invention, there is no strict requirement that the basis for evaluating the adaptability of the adsorbent must be that the adsorbent must have good practicality.

[0020] Furthermore, the first actual adsorption amount obtained is compared with the calculated first intrinsic adsorption amount to obtain the adsorbent calibration coefficient Specifically:

[0021] ;

[0022] Wherein, ΔQi refers to the ratio ΔQ of the first actual adsorption amount to the first intrinsic adsorption amount under the i-th test condition; n refers to the number of test conditions, n≥3.

[0023] Furthermore, the adsorbent deviation index k obtained by comparing the obtained second actual adsorption amount with the calculated second intrinsic adsorption amount is specifically:

[0024] k ;

[0025] Wherein, ΔWi refers to the ratio ΔW of the second actual adsorption amount to the second intrinsic adsorption amount under the i-th test condition; n refers to the number of test conditions, n≥3.

[0026] Furthermore, the adsorption amount, the first actual adsorption amount, and the second actual adsorption amount are obtained by integrating the adsorption curve:

[0027] ;

[0028] Among them, Q NOx (Unit: μmol / g) represents NO x The adsorption or desorption amount; F (unit: mL / min) represents the total flow rate of simulated gas; F in (Unit: ppm) is the imported NO x Concentration; F out (Unit: ppm) is the outlet NO x concentration; m (unit: g) is the weight of the adsorbent before adsorption; t (unit: min) represents the duration of the adsorption or desorption process.

[0029] Furthermore, the process of the steady-state simulation test includes: placing the adsorbent in a reaction tube, introducing oxygen and inert gas, pretreatment, setting a target volume space velocity and / or a target temperature, maintaining the target temperature and / or the target volume space velocity, introducing a simulated gas for testing until the adsorption of the adsorbent is completed, desorbing the adsorbent, and then testing the adsorption amount of the adsorbent at the next target volume space velocity and / or target temperature.

[0030] Furthermore, when evaluating the practicability of the adsorbent in an actual application environment, the test is performed while maintaining the target volumetric space velocity and target temperature when a simulated gas is introduced for testing.

[0031] Furthermore, when evaluating the adaptability of the adsorbent in the actual application environment, when passing the simulated gas for testing, including scheme i-scheme iii:

[0032] i scheme: maintain the set target volumetric airspeed and continuously change the temperature within the temperature range for testing;

[0033] Solution ii: Maintain the target temperature and continuously change the volumetric airspeed within the volumetric airspeed range for testing;

[0034] Solution iii: Set the target volume airspeed and target temperature as the volume airspeed interval and temperature interval, and continuously change the volume airspeed within the volume airspeed interval and the temperature within the temperature interval for testing.

[0035] Furthermore, the adsorbent is in at least one of the following forms: granular, powdery, blocky, stripy, foamy, and honeycomb.

[0036] Furthermore, the inert gas includes at least one of nitrogen, helium, argon, neon, krypton, and xenon.

[0037] Furthermore, when configuring the inert gas and oxygen, those skilled in the art may limit the ratio between the inert gas and oxygen according to actual needs.

[0038] Furthermore, the pretreatment includes heating the reaction tube to 500° C.-850° C. for at least 30 minutes, and then lowering the temperature of the reaction tube to a target temperature.

[0039] Furthermore, the simulated gas includes nitrogen, nitrogen oxides, oxygen, carbon monoxide, hydrocarbons, and carbon dioxide.

[0040] When configuring the simulated gas, those skilled in the art may limit the ratio between gases in the simulated gas according to actual needs.

[0041] Furthermore, the hydrocarbon includes one or more of methane, propane, ethylene, acetylene, and propylene.

[0042] Furthermore, the simulated gas also includes one or more of methanol, ethanol, toluene, C4-C12 straight-chain alkanes, monocyclic aromatic hydrocarbons, cycloalkanes, terpenes, and carbonyl compounds.

[0043] Furthermore, the process needs to be maintained for at least 10 minutes after the adsorbent has completed adsorption.

[0044] Furthermore, the specific step of desorption includes raising the temperature of the reaction tube to above 500°C.

[0045] Furthermore, the heating rate is 2°C / min-20°C / min.

[0046] Furthermore, the heating rate is 10°C / min.

[0047] Furthermore, the adsorption is completed when the concentration difference of the simulated gas before and after the adsorbent is less than ±10 ppm for more than 10 minutes.

[0048] Furthermore, the completion of the desorption is judged as the difference in simulated gas concentration before and after passing through the adsorbent, which is less than ±10 ppm for more than 10 minutes.

[0049] Furthermore, the target volume airspeed is 10 2 -10 6 h -1 .

[0050] Furthermore, the target temperature is 100°C-500°C.

[0051] Furthermore, the specific steps of installing the adsorbent on the engine bench for testing include:

[0052] Assemble engine bench test equipment and conduct tests;

[0053] The engine bench test device includes an engine, a heat source, an adsorption unit, a compressor, and a bypass pipeline;

[0054] The engine, heat source, and adsorption unit are connected in sequence through an exhaust pipeline;

[0055] A main valve is provided between the engine and the heat source;

[0056] The compressor is connected to the exhaust pipeline, and the connection point between the compressor and the exhaust pipeline is between the main valve and the heat source;

[0057] A bypass pipeline is connected between the engine and the main valve;

[0058] A bypass valve is provided on the bypass pipeline.

[0059] Further, the target temperature and target volume airspeed test process includes:

[0060] Place the adsorbent in the adsorption unit, close the main valve and bypass valve, pass the compressed air generated by the compressor into the exhaust pipeline, turn on the heat source to heat the exhaust pipeline between the heat source and the adsorption unit to above 500°C, keep it for 25min-35min, turn off the heat source, cool the exhaust pipeline between the heat source and the adsorption unit to below 100°C, turn off the compressor, and complete the pretreatment;

[0061] Open the bypass valve and close the main valve, start the engine, and when the target volumetric airspeed or target temperature is reached, close the bypass valve and open the main valve to test the adsorbent. When the difference in gas concentration before and after passing through the adsorbent is less than ±10ppm for more than 10 minutes, continue to collect for 10 minutes and the test ends;

[0062] Open the bypass valve and close the main valve, start the compressor, turn on the heat source to heat the exhaust pipe between the heat source and the adsorption unit to above 500°C, maintain for 25min-35min, the adsorbent completes the regeneration process, and then test the next target volume space velocity or target temperature.

[0063] Further, the test process under the test conditions within the set temperature range and volume space velocity range includes Scheme I to Scheme III:

[0064] Scheme I: Place the adsorbent in the adsorption unit, close the main valve and bypass valve, pass the compressed air generated by the compressor into the exhaust pipeline, turn on the heat source to heat the exhaust pipeline between the heat source and the adsorption unit to above 500°C, maintain for 25min-35min, turn off the heat source, cool the exhaust pipeline between the heat source and the adsorption unit to below 100°C, turn off the compressor, and complete the pretreatment;

[0065] Open the bypass valve and close the main valve, start the engine, and when the target volumetric airspeed is reached, close the bypass valve and open the main valve. Continuously change the temperature within the set temperature range to test the adsorbent. When the difference in gas concentration before and after passing through the adsorbent is less than ±10ppm for more than 10 minutes, continue to collect for 10 minutes and the test ends.

[0066] Open the bypass valve and close the main valve, start the compressor, turn on the heat source to heat the exhaust pipe between the heat source and the adsorption unit to above 500°C, maintain for 25min-35min, and the adsorbent completes the regeneration process;

[0067] II. Plan:

[0068] Place the adsorbent in the adsorption unit, close the main valve and bypass valve, pass the compressed air generated by the compressor into the exhaust pipeline, turn on the heat source to heat the exhaust pipeline between the heat source and the adsorption unit to above 500°C, keep it for 25min-35min, turn off the heat source, cool the exhaust pipeline between the heat source and the adsorption unit to below 100°C, turn off the compressor, and complete the pretreatment;

[0069] Open the bypass valve and close the main valve, start the engine, and when the target temperature is reached, close the bypass valve and open the main valve. Continuously change the volumetric airspeed within the set volumetric airspeed range to test the adsorbent. When the difference in gas concentration before and after passing through the adsorbent is less than ±10ppm for more than 10 minutes, continue to collect for 10 minutes and the test ends.

[0070] Open the bypass valve and close the main valve, start the compressor, turn on the heat source to heat the exhaust pipe between the heat source and the adsorption unit to above 500°C, maintain for 25min-35min, and the adsorbent completes the regeneration process;

[0071] Scheme III: Place the adsorbent in the adsorption unit, close the main valve and bypass valve, pass the compressed air generated by the compressor into the exhaust pipeline, turn on the heat source to heat the exhaust pipeline between the heat source and the adsorption unit to above 500°C, maintain for 25min-35min, turn off the heat source, cool the exhaust pipeline between the heat source and the adsorption unit to below 100°C, turn off the compressor, and complete the pretreatment;

[0072] Open the bypass valve and close the main valve, start the engine, and when the set temperature range and volumetric airspeed range are reached, close the bypass valve and open the main valve, continuously change the volumetric airspeed within the set volumetric airspeed range and continuously change the temperature within the set temperature range, test the adsorbent, and when the difference in gas concentration before and after passing through the adsorbent is less than ±10ppm for more than 10 minutes, continue to collect for 10 minutes and the test ends;

[0073] Open the bypass valve and close the main valve, start the compressor, turn on the heat source to heat the exhaust pipe between the heat source and the adsorption unit to above 500°C, maintain for 25min-35min, and the adsorbent completes the regeneration process.

[0074] The present invention also provides application of the tail gas adsorbent evaluation method in evaluating adsorbents.

[0075] The embodiments of the present invention have the following technical effects:

[0076] 1. The present invention proposes a calibration coefficient λ, which is used to evaluate the application stability of the exhaust gas adsorption material, reflect the adsorption material's anti-competitive adsorption ability and anti-interference ability in the actual engine exhaust gas, and is used to evaluate and judge whether it has practicality; the present invention also sets a deviation index κ, which is used to evaluate the real-time adsorption performance of the adsorption material, and reflect the timeliness and adaptability of the adsorption material in the face of real-time changes in engine exhaust gas.

[0077] 2. The adsorbent adsorbs the target substance, and the process can be divided into three stages: the target substance diffuses from the atmosphere to the surface of the adsorbent, the target substance binds and attaches to the surface of the adsorbent, and the target pollutant leaves the surface of the adsorbent and diffuses into the airflow. The volumetric air velocity will affect the diffusion of the target pollutant in the atmosphere. The smaller the volumetric air velocity, the more sufficient the contact time between the target pollutant and the adsorbent, which is beneficial to adsorption; on the contrary, the larger the volumetric air velocity, the less time the target pollutant has to fully contact the adsorbent, which is not conducive to adsorption. In addition, according to the Langmuir adsorption model, the adsorption process of the target substance on the surface of the adsorbent is a reversible adsorption and desorption process, a dynamic equilibrium process, and the adsorption rate is proportional to the temperature. Therefore, temperature is also another key indicator affecting the adsorption amount. Therefore, the present invention draws the intrinsic adsorption characteristics of the adsorbent through the adsorption amount, temperature and volumetric air velocity; the intrinsic adsorption characteristics of the adsorbent are effectively associated with the application stability and real-time adsorption performance of the adsorbent material to form a comprehensive adsorption performance evaluation test method, which can be used for adsorption material optimization and electronic control strategy development. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0079] Figure 1 It is a steady-state intrinsic adsorption characteristic curve provided by an embodiment of the present invention.

[0080] Figure 2 The invention relates to an engine bench test device provided by an embodiment of the invention.

[0081] The above drawings include the following reference numerals:

[0082] 1- compressor; 2- connection point between compressor and exhaust pipe; 3- heat source; 4- adsorption unit; 5- bypass valve; 6- bypass pipe; 7- engine; 8- main valve. DETAILED DESCRIPTION

[0083] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0084] In a first aspect, an embodiment of the present invention provides a method for evaluating a tail gas adsorbent, comprising the following steps:

[0085] Under the conditions of constant temperature and constant volumetric space velocity, the adsorption capacity of the adsorbent is obtained through steady-state simulation test, and the steady-state intrinsic adsorption characteristic curve of the adsorbent is drawn according to the temperature, volumetric space velocity and adsorption capacity;

[0086] The practicality of the adsorbent is evaluated by obtaining the first intrinsic adsorption amount of the adsorbent and the first actual adsorption amount of the adsorbent in the actual application environment through the steady-state intrinsic adsorption characteristic curve; the first intrinsic adsorption amount is the theoretical adsorption amount of the adsorbent in the steady-state simulation test;

[0087] Within the set temperature range and volume space velocity range, the adsorption capacity of the adsorbent is obtained through transient simulation test, and the transient intrinsic adsorption characteristic curve of the adsorbent is drawn according to the temperature range, volume space velocity range and adsorption capacity;

[0088] The adaptability of the adsorbent is evaluated by obtaining the second intrinsic adsorption capacity of the adsorbent through the transient intrinsic adsorption characteristic curve and the second actual adsorption capacity of the adsorbent in the actual application environment; the second intrinsic adsorption capacity is the theoretical adsorption capacity of the adsorbent in the transient simulation test.

[0089] In some embodiments, the first intrinsic adsorption amount of the adsorbent obtained by the steady-state intrinsic adsorption characteristic curve and the first actual adsorption amount of the adsorbent in the actual application environment are used to evaluate the practicality of the adsorbent:

[0090] Steady-state simulation test: Under constant temperature and constant volumetric space velocity test conditions, the adsorption capacity of the adsorbent under the corresponding test is obtained, and the steady-state intrinsic adsorption characteristic curve of the adsorbent is drawn according to the temperature, volumetric space velocity, and adsorption capacity, where the temperature is the X-axis, the volumetric space velocity is the Z-axis, and the adsorption capacity is the Y-axis;

[0091] The adsorbent is installed on an engine bench for testing, and the temperature and volumetric air velocity during the test are made consistent with the test conditions of the steady-state simulation test, so as to obtain the first actual adsorption amount of the adsorbent under the corresponding test conditions; the test conditions during the test are brought into the steady-state intrinsic adsorption characteristic curve of the adsorbent drawn by the steady-state simulation test, and the first intrinsic adsorption amount of the adsorbent under the corresponding test conditions is calculated;

[0092] The first actual adsorption amount obtained is compared with the calculated first intrinsic adsorption amount to obtain the adsorbent calibration coefficient , the adsorbent calibration factor Used to evaluate the practicality of adsorbents under actual application environments at constant temperature and / or constant volumetric space velocity;

[0093] The adsorbent calibration coefficient is positively correlated with the practicality of the adsorbent. The larger the adsorbent calibration coefficient, the better the practicality of the adsorbent.

[0094] In some embodiments, the adaptability of the adsorbent is evaluated by obtaining the second intrinsic adsorption amount of the adsorbent through the transient intrinsic adsorption characteristic curve and the second actual adsorption amount of the adsorbent in the actual application environment:

[0095] Transient simulation test: Under the test conditions within the set temperature range and volume space velocity range, continuously change the temperature and / or volume space velocity to obtain the adsorption amount of the adsorbent under the corresponding test conditions, and draw the transient intrinsic adsorption characteristic curve of the adsorbent according to the temperature, volume space velocity and adsorption amount, where the temperature is the X-axis, the volume space velocity is the Z-axis, and the adsorption amount is the Y-axis;

[0096] The adsorbent is installed on an engine bench for testing, and the temperature range and volume space velocity range during the test are made consistent with the test conditions of the transient simulation test, so as to obtain the second actual adsorption amount of the adsorbent under the corresponding test conditions; the test conditions during the test are brought into the transient intrinsic adsorption characteristic curve of the adsorbent drawn by the transient simulation test, and the second intrinsic adsorption amount of the adsorbent under the corresponding test conditions is calculated;

[0097] The obtained second actual adsorption amount is compared with the calculated second intrinsic adsorption amount to obtain an adsorbent deviation index k, wherein the deviation index k is used to evaluate the adaptability of the adsorbent in an actual application environment under the condition of continuously changing temperature and / or volume space velocity;

[0098] The adsorbent deviation index is positively correlated with the adaptability of the adsorbent. The larger the adsorbent deviation index, the better the adaptability of the adsorbent.

[0099] In some embodiments, the first actual adsorption amount obtained is compared with the calculated first intrinsic adsorption amount to obtain the adsorbent calibration coefficient Specifically:

[0100] ;

[0101] Wherein, ΔQi refers to the ratio ΔQ of the first actual adsorption amount to the first intrinsic adsorption amount under the i-th test condition; n refers to the number of test conditions, n≥3.

[0102] In some embodiments, the step of comparing the obtained second actual adsorption amount with the calculated second intrinsic adsorption amount to obtain the adsorbent deviation index k is specifically:

[0103] k ;

[0104] Wherein, ΔWi refers to the ratio ΔW of the second actual adsorption amount to the second intrinsic adsorption amount under the i-th test condition; n refers to the number of test conditions, n≥3.

[0105] In some embodiments, the adsorption amount, the first actual adsorption amount, and the second actual adsorption amount are obtained by integrating the adsorption curve:

[0106] ;

[0107] Among them, Q NOx (Unit: μmol / g) represents NO x The adsorption or desorption amount; F (unit: mL / min) represents the total flow rate of simulated gas; F in (Unit: ppm) is the imported NO x Concentration; F out (Unit: ppm) is the outlet NOx concentration; m (unit: g) is the weight of the adsorbent before adsorption; t (unit: min) represents the duration of the adsorption or desorption process.

[0108] In some embodiments, the process of the steady-state simulation test includes: placing the adsorbent in a reaction tube, introducing oxygen and inert gas, pretreatment, setting a target volume space velocity and / or a target temperature, maintaining the target temperature and / or the target volume space velocity, introducing a simulated gas for testing until the adsorption of the adsorbent is completed, desorbing the adsorbent, and then testing the adsorption amount of the adsorbent at the next target volume space velocity and / or target temperature.

[0109] In some embodiments, when evaluating the practicability of an adsorbent in an actual application environment, the test is performed while passing a simulated gas and maintaining a target volumetric space velocity and a target temperature.

[0110] In some embodiments, when evaluating the adaptability of the adsorbent in an actual application environment, when passing a simulated gas for testing, the following schemes are included:

[0111] i scheme: maintain the set target volumetric airspeed and continuously change the temperature within the temperature range for testing;

[0112] Solution ii: Maintain the target temperature and continuously change the volumetric airspeed within the volumetric airspeed range for testing;

[0113] Solution iii: Set the target volume airspeed and target temperature as the volume airspeed interval and temperature interval, and continuously change the volume airspeed within the volume airspeed interval and the temperature within the temperature interval for testing.

[0114] In some embodiments, the adsorbent is in at least one of a granular, powdery, blocky, stripy, foamy, and honeycomb shape.

[0115] In some embodiments, the inert gas includes at least one of nitrogen, helium, argon, neon, krypton, and xenon.

[0116] In some embodiments, those skilled in the art may limit the ratio between the inert gas and oxygen according to actual needs when configuring the inert gas and oxygen.

[0117] In some embodiments, the pretreatment includes heating the reaction tube to 500° C.-850° C. for at least 30 minutes, and then reducing the temperature of the reaction tube to a target temperature.

[0118] In some embodiments, the simulated gas includes nitrogen, nitrogen oxides, oxygen, carbon monoxide, hydrocarbons, and carbon dioxide.

[0119] In some embodiments, the hydrocarbon includes one or more of methane, propane, ethylene, acetylene, and propylene.

[0120] In some embodiments, the simulated gas further includes one or more of methanol, ethanol, toluene, C4-C12 straight-chain alkanes, monocyclic aromatic hydrocarbons, cycloalkanes, terpenes, and carbonyl compounds.

[0121] In some embodiments, the process needs to be maintained for at least 10 minutes after the adsorbent has completed adsorption.

[0122] In some embodiments, the specific step of desorption includes raising the temperature of the reaction tube to above 500°C.

[0123] In some embodiments, the heating rate is 2°C / min-20°C / min.

[0124] In some embodiments, the heating rate is 10° C. / min.

[0125] In some embodiments, the adsorption is completed when the concentration difference of the simulated gas before and after passing through the adsorbent is less than ±10 ppm for more than 10 minutes.

[0126] In some embodiments, the desorption is completed when the concentration difference of the simulated gas before and after passing through the adsorbent is less than ±10 ppm for more than 10 minutes.

[0127] In some embodiments, the target volume space velocity is 10 2 -10 6 h -1 .

[0128] In some embodiments, the target temperature is 100°C-500°C.

[0129] In some embodiments, the specific steps of installing the adsorbent on the engine bench for testing include:

[0130] Assemble engine bench test equipment and conduct tests;

[0131] The engine bench test device includes an engine 7, a heat source 3, an adsorption unit 4, a compressor 1, and a bypass pipe 6;

[0132] The engine 7, the heat source 3, and the adsorption unit 4 are connected in sequence through an exhaust pipeline;

[0133] A main valve 8 is provided between the engine 7 and the heat source 3;

[0134] The compressor 1 is connected to the exhaust pipeline, and the connection point 2 between the compressor 1 and the exhaust pipeline is between the main valve 8 and the heat source 3;

[0135] A bypass pipe 6 is connected between the engine 7 and the main valve 8;

[0136] The bypass pipe 6 is provided with a bypass valve 5 .

[0137] In the present invention, the engine is adjusted to a state where the bypass pipe prevents the adsorbent from contacting the exhaust gas before the exhaust gas state meets the test requirements. The heat source is used to increase the temperature of the adsorbent before the test to remove the impurity gas on the surface and regenerate it (i.e., the adsorbent desorption process).

[0138] In some embodiments, the process of testing the target temperature and the target volumetric airspeed includes:

[0139] Place the adsorbent in the adsorption unit 4, close the main valve 8 and the bypass valve 5, pass the compressed air generated by the compressor 1 into the exhaust pipeline, turn on the heat source 3 to heat the exhaust pipeline between the heat source 3 and the adsorption unit 4 to above 500°C, keep it for 25min-35min, turn off the heat source 3, cool the exhaust pipeline between the heat source 3 and the adsorption unit 4 to below 100°C, turn off the compressor 1, and complete the pretreatment;

[0140] Open the bypass valve 5 and close the main valve 8, start the engine 7, and when the target volumetric airspeed or target temperature is reached, close the bypass valve 5 and open the main valve 8 to test the adsorbent. When the difference in gas concentration before and after passing through the adsorbent is less than ±10ppm for more than 10 minutes, continue to collect for 10 minutes and the test ends;

[0141] Open the bypass valve 5 and close the main valve 8, start the compressor 1, turn on the heat source 3 to heat the exhaust pipeline between the heat source 3 and the adsorption unit 4 to above 500°C, maintain it for 25min-35min, the adsorbent completes the regeneration process, and then test the next target volume space velocity or target temperature.

[0142] In the present invention, the temperature and volume airspeed of the test target can be achieved during the test by adjusting the engine load and controlling the throttle.

[0143] After achieving constant temperature by adjusting engine load and controlling throttle, increase intake volume to achieve constant temperature-variable volume airspeed test conditions; when controlling intake volume, adjust engine load, control throttle, constant volume airspeed-variable temperature test conditions.

[0144] In some embodiments, the test process under the test conditions within the set temperature range and volume space velocity range includes Scheme I to Scheme III:

[0145] Scheme I: Place the adsorbent in the adsorption unit 4, close the main valve 8 and the bypass valve 5, pass the compressed air generated by the compressor 1 into the exhaust pipeline, turn on the heat source 3 to heat the exhaust pipeline between the heat source 3 and the adsorption unit 4 to above 500°C, keep it for 25min-35min, turn off the heat source 3, cool the exhaust pipeline between the heat source 3 and the adsorption unit 4 to below 100°C, turn off the compressor 1, and complete the pretreatment;

[0146] Open the bypass valve 5 and close the main valve 8, start the engine 7, and when the target volumetric airspeed is reached, close the bypass valve 5 and open the main valve 8, continuously change the temperature within the set temperature range, and test the adsorbent. When the difference in gas concentration before and after passing through the adsorbent is less than ±10ppm for more than 10 minutes, continue to collect for 10 minutes, and the test ends;

[0147] Open the bypass valve 5 and close the main valve 8, start the compressor 1, turn on the heat source 3 to heat the exhaust pipe between the heat source 3 and the adsorption unit 4 to above 500°C, maintain for 25min-35min, and the adsorbent completes the regeneration process;

[0148] II. Plan:

[0149] Place the adsorbent in the adsorption unit 4, close the main valve 8 and the bypass valve 5, pass the compressed air generated by the compressor 1 into the exhaust pipeline, turn on the heat source 3 to heat the exhaust pipeline between the heat source 3 and the adsorption unit 4 to above 500°C, keep it for 25min-35min, turn off the heat source 3, cool the exhaust pipeline between the heat source 3 and the adsorption unit 4 to below 100°C, turn off the compressor 1, and complete the pretreatment;

[0150] Open the bypass valve 5 and close the main valve 8, start the engine 7, and when the target temperature is reached, close the bypass valve 5 and open the main valve 8, continuously change the volumetric airspeed within the set volumetric airspeed range, and test the adsorbent. When the difference in gas concentration before and after passing through the adsorbent is less than ±10ppm for more than 10 minutes, continue to collect for 10 minutes, and the test ends;

[0151] Open the bypass valve 5 and close the main valve 8, start the compressor 1, turn on the heat source 3 to heat the exhaust pipe between the heat source 3 and the adsorption unit 4 to above 500°C, maintain for 25min-35min, and the adsorbent completes the regeneration process;

[0152] Scheme III: Place the adsorbent in the adsorption unit 4, close the main valve 8 and the bypass valve 5, pass the compressed air generated by the compressor 1 into the exhaust pipeline, turn on the heat source 3 to heat the exhaust pipeline between the heat source 3 and the adsorption unit 4 to above 500°C, keep it for 25min-35min, turn off the heat source 3, cool the exhaust pipeline between the heat source 3 and the adsorption unit 4 to below 100°C, turn off the compressor 1, and complete the pretreatment;

[0153] Open the bypass valve 5 and close the main valve 8, start the engine 7, and when the set temperature range and volumetric airspeed range are reached, close the bypass valve 5 and open the main valve 8, continuously change the volumetric airspeed within the set volumetric airspeed range and continuously change the temperature within the set temperature range, test the adsorbent, and when the difference in gas concentration before and after passing through the adsorbent is less than ±10ppm for more than 10 minutes, continue to collect for 10 minutes, and the test ends;

[0154] Open the bypass valve 5 and close the main valve 8, start the compressor 1, turn on the heat source 3 to heat the exhaust pipeline between the heat source 3 and the adsorption unit 4 to above 500°C, maintain for 25min-35min, and the adsorbent completes the regeneration process.

[0155] In a second aspect, some embodiments of the present invention also provide the application of the tail gas adsorbent evaluation method in evaluating adsorbents.

[0156] The following is described in conjunction with specific embodiments:

[0157] Embodiment 1:

[0158] Simulated steady-state adsorption performance evaluation:

[0159] Place 1g of the adsorbent material to be tested, which has been compressed and sieved out of 40-60 mesh, into the middle section of a high-temperature resistant quartz tube, and plug the two ends of the catalyst with an appropriate amount of quartz wool to fix the granular adsorbent to prevent it from being blown away by the reaction gas during ventilation. Then fix the quartz tube in a tubular furnace. First, pretreatment is carried out to remove possible impurities and moisture on its surface. The pretreatment conditions are a temperature of 550°C, and the treated gas is a volume ratio of 10% O2 / N2 (the total flow rate is maintained at 1000mL / min) and the treatment time is 30min. After the tubular furnace cools to room temperature, reset the furnace temperature of the tubular furnace to 100°C, which is the temperature of the entire adsorption process. Before testing the adsorption performance, collect the background spectrum of the gas analyzer. Switch the gas path to bypass, and test the background spectrum under pure N2 conditions. Subsequently, adjust the simulated exhaust gas, 500ppm NO x , 10% O2, 500ppm CO and 5% H2O, with nitrogen as the balance gas, the total gas flow rate is 1000mL / min, and the volume space velocity is 40000h-1 .

[0160] After the concentration of each component gas is stable, start recording data. After stabilization for 5 minutes, switch to the reaction tube, let the reaction gas pass through the adsorbent at 100°C, and record the change of gas concentration during the entire adsorption process. After reaching the adsorption saturation condition, start the programmed temperature increase process. The heating rate is 5°C / min, and it takes 80 minutes from 100°C to 500°C.

[0161] According to the curve of nitrogen oxide concentration changing with temperature rise, the integral is obtained at 100℃ and 40000h -1 The simulated steady-state adsorption amount at the volumetric space velocity was 398.5 μmol / g, as shown in Table 1 ;

[0162] Repeat the above steps and reset the temperature of the tube furnace to 110℃ and 120℃. According to the curve of nitrogen oxide concentration changing with temperature rise, the integral is obtained at 110℃ and 120℃ at 40000h. -1 The simulated steady-state adsorption amount at the volume space velocity is shown in Table 1.

[0163] Repeat the above steps and adjust the total gas flow rate to 500mL / min and 1500mL / min, corresponding to a space velocity of 20000h -1 、60000h -1 Reset the temperature of the tube furnace to 100°C, and integrate the curve of nitrogen oxide concentration changing with temperature rise to obtain the nitrogen oxide concentration at 100°C and 20,000 hours. -1 、60000h -1 The simulated steady-state adsorption amount at different space velocities is shown in Table 1.

[0164] Furthermore, the corresponding relationship between the temperature, volume space velocity and adsorption amount of the adsorbent material is obtained, and the relationship is plotted as a three-dimensional surface diagram consisting of XYZ axes. The corresponding intrinsic adsorption amount can be calculated through any set of temperature and volume space velocity;

[0165] Table 1 Results of simulating steady-state adsorption performance to evaluate adsorbent adsorption capacity

[0166]

[0167] The steady-state intrinsic adsorption characteristic curve of the adsorbent is drawn according to the temperature, volume space velocity and adsorption amount, where the temperature is the X-axis, the volume space velocity is the Z-axis and the adsorption amount is the Y-axis, such as Figure 1 shown.

[0168] Based on engine bench steady-state performance evaluation:

[0169] The above adsorption materials are packaged in the adsorption unit and installed in the exhaust pipe of the engine stand. See the installation diagram. Figure 2After installation, pre-treat the adsorber, close the bypass valve 5 and the main valve 8, introduce the compressor 1 to generate compressed air, turn on the heat source 3, and keep the front temperature of the adsorption material above 500℃ for 30 minutes. After the treatment is completed, turn off the heat source 3, blow it with compressed air to below 100℃, and turn off the compressor 1.

[0170] Open the bypass valve 5, close the main valve 8, start the engine 7, control the emission to reach a stable state, and the exhaust temperature and volume airspeed meet the steady-state requirements. The volume airspeed is 40000h -1 .

[0171] Close the bypass valve 5, open the main valve 8, sample and monitor the change of nitrogen oxide concentration before and after the adsorber, the adsorption temperature is 100℃, wait until the nitrogen oxide concentrations at the front and back ends reach the same, continue sampling for 10 minutes, and the experiment ends.

[0172] According to the curve of nitrogen oxide concentration changing with time, the integral is obtained based on the engine test bench at 100℃ and 40000h -1 The first actual adsorption amount at volume space velocity.

[0173] Repeat the engine bench steady-state evaluation steps, maintaining a volumetric airspeed of 40,000 h -1 The difference is that the temperature of the adsorber is adjusted to 110°C and 120°C, and the curves of engine tail exhaust oxide concentration changing with time are obtained respectively, and the first actual adsorption amount based on the engine bench at 110°C and 120°C is obtained by integration.

[0174] Similarly, maintain the volumetric airspeed at 40000h -1 , adjust the temperature to any point in the range of 100℃-250℃, and obtain the temperature at 40000h by integration. -1 The first actual adsorption amount at volume space velocity.

[0175] Repeat the engine bench steady-state evaluation steps, maintain the tail exhaust adsorption reaction temperature constant at 100°C, and adjust the tail exhaust volume airspeed to 20,000 h -1 、60000h -1 , respectively, the curves of the engine tail exhaust oxide concentration changing with time are obtained, and the first actual adsorption amount of each volume space velocity based on the engine bench at the constant temperature point is obtained by integration.

[0176] The test conditions in the steady-state performance evaluation of the engine bench are brought into the steady-state intrinsic adsorption characteristic curve obtained in the simulated steady-state adsorption performance evaluation to obtain the first intrinsic adsorption amount of the adsorbent. The first actual adsorption amount is obtained in the steady-state performance evaluation of the engine bench, and the first actual adsorption amount is compared with the first intrinsic adsorption amount to obtain the adsorbent calibration coefficient. :

[0177] ;

[0178] Wherein, ΔQi refers to the ratio ΔQ of the first actual adsorption amount to the first intrinsic adsorption amount under the i-th test condition; n refers to the number of test conditions, n≥3, and the results are shown in Table 2.

[0179] Table 2 Adsorbent calibration factors

[0180]

[0181] Example of simulation of transient adsorption performance evaluation:

[0182] Place 1.0g of the compressed and sieved 40-60 mesh adsorbent material in a quartz reaction tube, fix it with quartz wool at both ends, and install it in the simulation evaluation equipment. Pre-treat the sample to be tested at a pre-treatment temperature of 550°C, a treatment gas of 10% O2 / N2 (the total flow rate is maintained at 1000mL / min), and a treatment time of 30min. After pre-treatment, cool it to room temperature, collect the test background of the gas analyzer, collect the background spectrum in a nitrogen environment and subtract the background. Adjust the simulated gas, 500ppm NO x , 10% O2, 500ppm CO and 5% H2O, with nitrogen as the balance gas, the total gas flow rate is 1000mL / min, and the volume space velocity is 40000h -1 After the gas stabilizes, data is recorded and maintained for 5 minutes. Subsequently, the test atmosphere is switched to the reaction tube and the temperature is programmed to rise from room temperature to 500°C at a rate of 5°C / min.

[0183] According to the curve of nitrogen oxide concentration changing with time, the integral is obtained from room temperature (28℃) to 500℃, 40000h -1 The adsorption amount at the volume space velocity is shown in Table 1.

[0184] Repeat the above steps and adjust the total gas flow rate to 500mL / min and 1500mL / min, corresponding to a space velocity of 20000. -1 、60000h -1 According to the curve of nitrogen oxide concentration changing with temperature rise, the integral is obtained from room temperature to 500℃ 20000 -1 、60000h -1 The adsorption amount corresponding to the air velocity is shown in Table 1.

[0185] The transient intrinsic adsorption characteristic curve of the adsorbent is drawn according to the temperature, volume space velocity and adsorption amount, wherein the temperature is the X-axis, the volume space velocity is the Z-axis and the adsorption amount is the Y-axis.

[0186] Based on transient performance evaluation of engine bench:

[0187] The above adsorption materials are packaged in the adsorption unit and installed in the exhaust pipe of the engine stand. See the installation diagram. Figure 2 After installation, pre-treat the adsorber, close the bypass valve 5 and the main valve 8, introduce the compressor 1 to generate compressed air, turn on the heat source 3, and keep the front temperature of the adsorption material above 500℃ for 30 minutes. After the treatment is completed, turn off the heat source 3, blow it with compressed air to below 100℃, and turn off the compressor 1.

[0188] Open bypass valve 5, close main valve 8, start engine 7, control emissions to a stable state, exhaust temperature and airspeed to meet steady-state requirements, volume airspeed is 40000h -1 .

[0189] Close the bypass valve 5, open the main valve 8, sample and monitor the change of nitrogen oxide concentration before and after the adsorber, and control the adsorption temperature to continuously change between room temperature and 500°C by adjusting the engine. When the nitrogen oxide concentrations at the front and rear ends reach the same, continue to collect for 10 minutes and the experiment ends.

[0190] According to the curve of nitrogen oxide concentration changing with time, the integral is obtained based on the engine test bench room temperature -500℃, 40000h -1 The second actual adsorption amount at volume space velocity.

[0191] Repeat the engine bench steady-state evaluation steps and change the volumetric airspeed to 20,000 h by increasing the intake volume. -1 and 60000h -1 , the adsorption temperature is controlled to change continuously between room temperature and 500°C, and the curves of engine tail exhaust oxide concentration changing with time are obtained respectively. The second actual adsorption amount based on the engine bench at the adsorption temperature of room temperature to 500°C is obtained by integration.

[0192] The test conditions in the steady-state performance evaluation of the engine bench are brought into the transient intrinsic adsorption characteristic curve obtained in the simulated transient adsorption performance evaluation to obtain the second intrinsic adsorption amount of the adsorbent. The second actual adsorption amount is obtained in the steady-state performance evaluation of the engine bench, and the second actual adsorption amount is compared with the second intrinsic adsorption amount to obtain the adsorbent deviation index k:

[0193] ;

[0194] Wherein, ΔWi refers to the ratio ΔW of the second actual adsorption amount to the second intrinsic adsorption amount under the i-th test condition; n refers to the number of test conditions, n≥3, and the results are shown in Table 3.

[0195] Table 3 Adsorbent deviation index k

[0196]

[0197] Example 2

[0198] The calibration coefficient λ and the deviation index κ vary with the content of active adsorption elements in the adsorption material. When the content of active adsorption element palladium in the oxide adsorption material is 3wt%, the calibration coefficient λ of the adsorbent obtained by the method of the present invention is close to 0.98, and the deviation index k exceeds 0.9.

[0199] Comparative Example 1

[0200] The weight loss of the adsorbent material during the temperature rise process was monitored by a synchronous thermal analyzer (TG-DSC). The test results showed that the weight loss was 0.24 mg after 250°C. However, the TG-DSC method has the following defects:

[0201] The thermal gravimetric test method uses a precision balance to monitor the mass lost due to thermal decomposition and then obtain the adsorption amount of the adsorbent. However, in addition to adsorbing the target gas, the adsorbent may also absorb other gases. The thermal gravimetric test method cannot accurately obtain the adsorption amount of the tail gas, which will affect the judgment of the adsorbent, resulting in poor effect of the adsorbent in practical applications. The method of the present invention can accurately calculate the adsorption amount, which also paves the way for further evaluating the practicality and adaptability of the adsorbent.

[0202] The TG curve cannot distinguish the state of the target pollutant and the adsorbent in the temperature rise process, but the present invention can;

[0203] The error influencing factors of the simultaneous thermal analysis method are many. The thermal analysis method needs to treat the adsorbent at 800°C. The temperature of the thermal analysis method will cause the structure of the adsorbent to change, while the method of the present invention will not cause the structure of the adsorbent to change.

[0204] In summary, the method for evaluating tail gas adsorption materials provided by the present invention has better practicality and accuracy.

[0205] It should be noted that the terms used in the present invention are only for describing specific embodiments, rather than limiting the scope of the present application. As shown in the present specification, unless the context clearly indicates an exception, the words "one", "a", "a kind of" and / or "the" do not specifically refer to the singular, but may also include the plural. The terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method or device. In the absence of more restrictions, the elements defined by the sentence "include one..." do not exclude the presence of other identical elements in the process, method or device including the elements.

[0206] It should also be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0207] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention.

Claims

1. A method for evaluating tail gas adsorbent, characterized in that: The steps include: Under the conditions of constant temperature and constant volumetric space velocity, the adsorption capacity of the adsorbent is obtained through steady-state simulation test, and the steady-state intrinsic adsorption characteristic curve of the adsorbent is drawn according to the temperature, volumetric space velocity and adsorption capacity; The practicality of the adsorbent is evaluated by obtaining the first intrinsic adsorption amount of the adsorbent and the first actual adsorption amount of the adsorbent in the actual application environment through the steady-state intrinsic adsorption characteristic curve; the first intrinsic adsorption amount is the theoretical adsorption amount of the adsorbent in the steady-state simulation test; Within the set temperature range and volume space velocity range, the adsorption capacity of the adsorbent is obtained through transient simulation test, and the transient intrinsic adsorption characteristic curve of the adsorbent is drawn according to the temperature range, volume space velocity range and adsorption capacity; The adaptability of the adsorbent is evaluated by obtaining the second intrinsic adsorption amount of the adsorbent through the transient intrinsic adsorption characteristic curve and the second actual adsorption amount of the adsorbent in the actual application environment; the second intrinsic adsorption amount is the theoretical adsorption amount of the adsorbent in the transient simulation test; The practicality of the adsorbent is evaluated by obtaining the first intrinsic adsorption amount of the adsorbent through the steady-state intrinsic adsorption characteristic curve and the first actual adsorption amount of the adsorbent under the actual application environment: Steady-state simulation test: Under constant temperature and constant volumetric space velocity test conditions, the adsorption capacity of the adsorbent under the corresponding test is obtained, and the steady-state intrinsic adsorption characteristic curve of the adsorbent is drawn according to the temperature, volumetric space velocity, and adsorption capacity, where the temperature is the X-axis, the volumetric space velocity is the Z-axis, and the adsorption capacity is the Y-axis; The adsorbent is installed on an engine bench for testing, and the temperature and volumetric air velocity during the test are made consistent with the test conditions of the steady-state simulation test, so as to obtain the first actual adsorption amount of the adsorbent under the corresponding test conditions; the test conditions during the test are brought into the steady-state intrinsic adsorption characteristic curve of the adsorbent drawn by the steady-state simulation test, and the first intrinsic adsorption amount of the adsorbent under the corresponding test conditions is calculated; The first actual adsorption amount obtained is compared with the calculated first intrinsic adsorption amount to obtain the adsorbent calibration coefficient , the adsorbent calibration factor Used to evaluate the practicality of adsorbents under actual application environments at constant temperature and / or constant volumetric space velocity; The adsorbent calibration coefficient is positively correlated with the practicality of the adsorbent. The larger the adsorbent calibration coefficient, the better the practicality of the adsorbent. The adaptability of the adsorbent is evaluated by obtaining the second intrinsic adsorption amount of the adsorbent through the transient intrinsic adsorption characteristic curve and the second actual adsorption amount of the adsorbent under the actual application environment: Transient simulation test: Under the test conditions within the set temperature range and volume space velocity range, continuously change the temperature and / or volume space velocity to obtain the adsorption amount of the adsorbent under the corresponding test conditions, and draw the transient intrinsic adsorption characteristic curve of the adsorbent according to the temperature, volume space velocity and adsorption amount, where the temperature is the X-axis, the volume space velocity is the Z-axis, and the adsorption amount is the Y-axis; The adsorbent is installed on the engine bench for testing, and the temperature range and volume space velocity range during the test are made consistent with the test conditions of the transient simulation test, so as to obtain the second actual adsorption amount of the adsorbent under the corresponding test conditions; the test conditions during the test are brought into the transient intrinsic adsorption characteristic curve of the adsorbent drawn by the transient simulation test, and the second intrinsic adsorption amount of the adsorbent under the corresponding test conditions is calculated; The obtained second actual adsorption amount is compared with the calculated second intrinsic adsorption amount to obtain an adsorbent deviation index k, wherein the deviation index k is used to evaluate the adaptability of the adsorbent in an actual application environment under the condition of continuously changing temperature and / or volume space velocity; The adsorbent deviation index is positively correlated with the adaptability of the adsorbent. The larger the adsorbent deviation index, the better the adaptability of the adsorbent. The first actual adsorption amount obtained is compared with the calculated first intrinsic adsorption amount to obtain the adsorbent calibration coefficient Specifically: ； Wherein, ΔQi refers to the ratio ΔQ of the first actual adsorption amount to the first intrinsic adsorption amount under the i-th test condition; n refers to the number of test conditions, n≥3; The adsorbent deviation index k obtained by comparing the obtained second actual adsorption amount with the calculated second intrinsic adsorption amount is specifically: ； Wherein, ΔWi refers to the ratio ΔW of the second actual adsorption amount to the second intrinsic adsorption amount under the i-th test condition; n refers to the number of test conditions, n≥3.

2. The evaluation method according to claim 1, characterized in that: The adsorption amount, the first actual adsorption amount, and the second actual adsorption amount are obtained by integrating the adsorption curve: ； Among them, Q NOx Indicates NO x The amount of adsorption or desorption; F represents the total gas flow rate; F in For imported NO x Content; F out For export NO x content; m is the weight of the adsorbent before adsorption; t represents the duration of the adsorption or desorption process.

3. The evaluation method according to claim 1, characterized in that: When the adsorbent is installed on an engine bench for testing, the engine bench testing device comprises an engine (7), a heat source (3), an adsorption unit (4), a compressor (1), and a bypass pipe (6); The engine (7), the heat source (3), and the adsorption unit (4) are connected in sequence via an exhaust pipeline; A main valve (8) is provided between the engine (7) and the heat source (3); The compressor (1) is connected to the exhaust pipeline, and the connection point (2) between the compressor (1) and the exhaust pipeline is between the main valve (8) and the heat source (3); A bypass pipeline (6) is connected between the engine (7) and the main valve (8); A bypass valve (5) is provided on the bypass pipeline (6); The adsorbent is placed in an adsorption unit (4) for testing.

4. Application of the evaluation method according to any one of claims 1 to 3 in evaluating adsorbents.

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