CN-121994638-A - Method for evaluating catalytic effect of catalytic combustion catalyst

Abstract

The invention provides a method for evaluating the catalytic effect of a catalytic combustion catalyst, and belongs to the technical field of catalytic combustion catalysts. The evaluation method can be used for systematically evaluating the influence of the catalytic combustion catalyst on the solid fuel combustion process, including combustion characteristics, reaction dynamics and pollutant emission behaviors, and provides reliable and comprehensive evaluation basis for the development and optimization of the catalytic combustion catalyst.

Inventors

• WEI YANRONG
• ZHANG JING
• LIU ZHENYU
• Li Xuanda
• CHEN ZHE
• Sun Tahan
• YU HAIPENG
• ZHANG SONG
• WANG YONGYING
• NIU FANG
• GONG YANYAN
• LI MEIJUN
• ZHANG YUAN
• DUAN LU
• CUI MINGSHUANG
• YAN SHUJUAN
• JIA NAN

Assignees

• 北京天地融创科技股份有限公司

Dates

Publication Date

20260508

Application Date

20251212

Claims (10)

1. 1. A method for evaluating a catalytic effect of a catalytic combustion catalyst, characterized by comprising the steps of: Step 1, providing solid fuel without adding a catalytic combustion catalyst as a control sample, and providing a plurality of solid fuels with the catalytic combustion catalyst as experimental samples, wherein the solid fuel in the experimental samples is the same as the solid fuel in the control sample, and the single comparison variables of the experimental samples comprise components of the catalytic combustion catalyst or the adding proportion of the catalytic combustion catalyst; Step 2, respectively performing thermal weight testing on a plurality of experimental samples and a plurality of control samples, acquiring thermal weight loss data of solid fuels in the experimental samples and the control samples in a catalytic combustion process and mass spectrum data of generated gas pollutants by adopting thermal weight-mass spectrometry combined equipment, acquiring reaction activation energy, characteristic temperature and combustion characteristic index of the solid fuels in the experimental samples and the control samples in the catalytic combustion process according to the thermal weight loss data, and acquiring emission of the gas pollutants generated in the catalytic combustion process of the solid fuels in the experimental samples and the control samples according to the mass spectrum data; Step 3, respectively obtaining evaluation index change amounts of a plurality of experimental samples relative to the control sample, wherein the evaluation index change amounts comprise one or more of reaction activation energy change rate, characteristic temperature change rate, combustion characteristic index change rate and gas pollutant discharge amount change rate; And 4, evaluating the influence degree of the catalytic combustion catalysts on the solid fuel combustion effect according to the evaluation index change amounts corresponding to the catalytic combustion catalysts, wherein the larger the evaluation index change amount is, the larger the influence degree of the catalytic combustion catalysts on the solid fuel combustion effect is judged.
2. 2. The method according to claim 1, wherein in step 1, the catalytic combustion catalyst is rare earth tailing powder, and/or the solid fuel comprises pulverized coal and/or biomass powder.
3. 3. The evaluation method according to claim 2, wherein in step 2, when the solid fuel is pulverized coal, the temperature rise rate of the thermogravimetric test is 10 ℃ per minute to 20 ℃ per minute, and the temperature is raised from room temperature to 1200 ℃.
4. 4. The evaluation method according to claim 1, wherein in the step 2, obtaining the thermal weight loss data of the solid fuel in the plurality of experimental samples and the control samples in the catalytic combustion process specifically comprises the steps of obtaining the residual mass percentages of the solid fuel in the plurality of experimental samples and the control samples at different temperatures in the catalytic combustion process to form a TG curve, and deriving the TG curve to form a DTG curve.
5. 5. The method of claim 1, wherein in step 2, the reaction activation energy is calculated by the following formula: , Wherein, alpha is the conversion rate in the oxidative decomposition process of the solid fuel, alpha is equal to the initial mass of the solid fuel on the mass ratio of the solid fuel loss, the unit of alpha is%g (alpha) is the integral function of a function model of the oxidation reaction mechanism of the solid fuel, A is a front factor, the unit is K/s, R is a gas general constant, 8.314J/(mol.K), beta is the temperature rising rate, the unit is DEG C/min, E is the reaction activation energy, the unit is kJ/mol, and T is the temperature, and the unit is K.
6. 6. The method of claim 4, wherein in step 2, the characteristic temperatures include T 1 、T 2 、T 3 、T 4 and T p ; Wherein T 1 is the temperature at which the solid fuel loses moisture and loses weight to reach the lowest point; T 2 is the temperature when the oxygen uptake of the solid fuel increases to the highest point; The ignition temperature T 3 is determined by the following method that a vertical line passing through the peak point of the DTG curve is intersected with the DTG curve at a point A, a tangent line L 2 passing through the point A is intersected with a horizontal line L 1 when the volatilization of the tangent line L 2 and the DTG curve starts to lose weight, the intersection point of the tangent line L 2 and the horizontal line L 1 is an i point, the temperature value corresponding to the i point is the ignition temperature T 3 , and the i point is the ignition point; The burnout temperature T 4 is determined by the method that the intersection point of the tangent line L 2 and the horizontal line L 3 at the end of the weight loss of the DTG curve is the f point, the temperature value corresponding to the f point is the burnout temperature T 4 , and the f point is the burnout point; T p is the maximum weight loss rate temperature, and the maximum weight loss rate temperature T p is determined by the method that the ordinate value of the peak point of the DTG curve is the maximum weight loss rate (dw/dt) max , and the temperature value corresponding to the maximum weight loss rate (dw/dt) max is the maximum weight loss rate temperature T p .
7. 7. The method according to claim 6, wherein in the step 2, the reaction activation energy of the solid fuel in the plurality of experimental samples and the control sample in the catalytic combustion process is obtained according to the thermal weight loss data, specifically, the reaction activation energy of the solid fuel in the plurality of experimental samples and the control sample in the catalytic combustion process is obtained according to the thermal weight loss data, the plurality of combustion stages comprise a moisture evaporation weight loss stage, an oxygen absorption weight gain stage, a thermal decomposition stage, a combustion stage and a burnout stage, the moisture evaporation weight loss stage is a stage with a temperature < T 1 , the oxygen absorption weight gain stage is a stage with a temperature greater than or equal to T 1 and less than T 2 , the thermal decomposition stage is a stage with a temperature greater than or equal to T 2 and less than T 3 , the combustion stage is a stage with a temperature greater than or equal to T 3 and less than T 4 , and the burnout stage is a stage with a temperature > T 4 ; In the step 3, the reaction activation energy change rates of a plurality of experimental samples relative to the control sample are respectively obtained, specifically, the reaction activation energy change rates of a plurality of experimental samples relative to the control sample in different combustion stages are respectively obtained; In the step 4, according to the reaction activation energy change rates corresponding to the catalytic combustion catalysts, the influence degree of the catalytic combustion catalysts on the combustion effect of the solid fuel is evaluated, specifically, according to the reaction activation energy change rates corresponding to different combustion stages of the catalytic combustion catalysts, the influence degree of the catalytic combustion catalysts on the combustion effect of the solid fuel in different combustion stages is evaluated.
8. 8. The evaluation method according to claim 6, wherein the combustion characteristic index is calculated by the following formula: , wherein (dw/dt) mean is the average burn-out weight rate from the ignition point to the burnout point.
9. 9. The method according to claim 1, wherein the mass spectrum data is obtained by acquiring a plurality of generation curves of gas pollutants generated by solid fuel in the experimental sample and the control sample in the catalytic combustion process, and taking the area under the peak in the generation curves as the emission amount of the gas pollutants.
10. 10. The method of evaluation of claim 1 or 9, wherein the gaseous contaminants comprise one or more of NO, NO 2 and SO 2 .

Description

Method for evaluating catalytic effect of catalytic combustion catalyst Technical Field The invention belongs to the technical field of catalytic combustion catalysts, and particularly relates to a method for evaluating catalytic effect of a catalytic combustion catalyst. Background The catalytic combustion can realize complete combustion of solid fuel (such as pulverized coal, biomass powder and the like) at a lower temperature, has extremely important effects on improving the combustion process, reducing the reaction temperature, promoting complete combustion, inhibiting the formation of toxic and harmful substances and the like, is an environment-friendly process, has continuously expanded application fields, and has been widely applied to various aspects of industrial production. The catalyst used for catalytic combustion is referred to as a catalytic combustion catalyst. The current high-efficiency catalytic combustion catalyst generally takes noble metals such as Pt, pd, ru and the like as active components. The catalyst has high catalytic activity, but is expensive, scarce in resources and easy to poison and inactivate, thus greatly limiting the large-scale industrial application of the catalyst. Some researches adopt transition metal oxides such as CuO, mnO 2、Co3O4 and the like to replace noble metals such as Pt, pd, ru and the like as active components, and the cost of the catalytic combustion catalyst is reduced, but the catalytic combustion catalyst has the problems of low activity, poor high-temperature stability, short service life and the like. The rare earth element shows higher catalytic activity by virtue of the unique electronic structural characteristic, and has wide application prospect as a catalytic combustion catalyst. Disclosure of Invention The present invention is based on the discovery and recognition by the inventors of the fact that pure cerium oxide (CeO 2) is an excellent catalytic material, but high-purity cerium oxide is costly. Rare earth resources in China are rich, but the exploitation of rare earth ores is long-term faced with the problems of disordered order, insufficient comprehensive utilization level, low resource utilization rate and the like, so that a large amount of rare earth tailings are accumulated. The rare earth tailings contain rich CeO 2, which is a valuable secondary resource, and the catalyst prepared by using the rare earth tailings is of great significance for the combustion of solid fuels (such as coal dust, biomass powder and the like). It is desirable to provide a method for evaluating the catalytic effect of a catalytic combustion catalyst, which can be used for systematically evaluating the influence of a rare earth tailing-based catalytic combustion catalyst on the combustion process of solid fuels (such as pulverized coal, biomass powder and the like), including combustion characteristics, reaction dynamics and pollutant emission behaviors, and provides reliable and comprehensive evaluation basis for the development and optimization of such catalytic combustion catalysts. The present invention aims to solve at least one of the technical problems in the related art to some extent. For this reason, the embodiment of the invention proposes a method of evaluating the catalytic effect of a catalytic combustion catalyst. The embodiment of the invention provides a method for evaluating the catalytic effect of a catalytic combustion catalyst, which comprises the following steps: Step 1, providing solid fuel without adding a catalytic combustion catalyst as a control sample, and providing a plurality of solid fuels with the catalytic combustion catalyst as experimental samples, wherein the solid fuel in the experimental samples is the same as the solid fuel in the control sample, and the single comparison variables of the experimental samples comprise components of the catalytic combustion catalyst or the adding proportion of the catalytic combustion catalyst; Step 2, respectively performing thermal weight testing on a plurality of experimental samples and a plurality of control samples, acquiring thermal weight loss data of solid fuels in the experimental samples and the control samples in a catalytic combustion process and mass spectrum data of generated gas pollutants by adopting thermal weight-mass spectrometry combined equipment, acquiring reaction activation energy, characteristic temperature and combustion characteristic index of the solid fuels in the experimental samples and the control samples in the catalytic combustion process according to the thermal weight loss data, and acquiring emission of the gas pollutants generated in the catalytic combustion process of the solid fuels in the experimental samples and the control samples according to the mass spectrum data; Step 3, respectively obtaining evaluation index change amounts of a plurality of experimental samples relative to the control sample, wherein the evaluation index change amounts com