阅读说明：本技术 一种基于检测活性的scr脱硝催化剂更换体积量核算方法 (SCR denitration catalyst replacement volume accounting method based on detection activity ) 是由 张杨 唐郭安 王东 喻小伟 王艳鹏 李龙涛 朱跃 于 2019-07-16 设计创作，主要内容包括：本发明公开了一种基于检测活性的SCR脱硝催化剂更换体积量核算方法,属于工业废气净化环保及能源领域。本发明通过检测脱硝装置内每一层催化剂的活性并计算活性衰减系数,从而在整体催化剂寿命到期时能够判断更换哪一层催化剂,并准确的评估和核算催化剂更换体积量,有效指导催化剂的更换管理工作。本方法具有系统、准确、操作性强的优点,能够保障脱硝装置稳定、可靠、经济运行,产生显著的环保效益、安全效益以及经济效益,具有广泛的应用前景。(The invention discloses an SCR denitration catalyst replacement volume accounting method based on detection activity, and belongs to the field of industrial waste gas purification, environmental protection and energy. According to the invention, the activity of each layer of catalyst in the denitration device is detected and the activity attenuation coefficient is calculated, so that which layer of catalyst is replaced can be judged when the service life of the whole catalyst is due, the volume of the replaced catalyst is accurately estimated and calculated, and the replacement management work of the catalyst is effectively guided. The method has the advantages of systematic, accurate and strong operability, can ensure the stable, reliable and economic operation of the denitration device, generates obvious environmental protection benefit, safety benefit and economic benefit, and has wide application prospect.)

1. A detection activity-based SCR denitration catalyst replacement volume accounting method is characterized by comprising the following steps: calculating the activity attenuation coefficient of each layer of catalyst by detecting the activity of a newly-installed SCR denitration catalyst and an in-service catalyst, and calculating and determining the volume amount of the catalyst to be replaced after the service life of the catalyst is over on the basis;

The detection of the activity of the catalyst refers to that aiming at each layer of catalyst newly installed and in service in the SCR denitration device, the activity K value of the catalyst is calculated through a formula (1) by detecting the concentration of NOx at an inlet and an outlet of the catalyst under the conditions of designed flue gas conditions and ammonia nitrogen molar ratio of 1.05;

Wherein K is the activity of the catalyst, m/h, A _V is the surface velocity, m/h, C _in is the concentration of NOx at the inlet of the SCR denitration reactor, muL/L, and C _out is the concentration of NOx at the outlet of the SCR denitration reactor, muL/L;

calculating the activity attenuation coefficient of each layer of catalyst through a formula (2) according to the activity of the newly-installed catalyst and the catalyst in service;

wherein K _i is the activity attenuation coefficient of the catalyst of the i-th layer,%, K _z is the detection activity of the in-service catalyst, m/h, and K ₀ is the detection activity of the new catalyst, m/h;

when detecting that the integral denitration efficiency, ammonia escape concentration and SO ₂/SO ₃ conversion rate of the multilayer catalyst in the denitration device can not meet the performance requirements under the designed flue gas condition, preferentially considering the layer of catalyst with the minimum activity attenuation coefficient to be replaced, and calculating and determining the replacement amount of the catalyst according to the formula (3);

the method comprises the following steps of obtaining a denitration device, wherein Q _s is the catalyst replacement volume amount, m ³, Q _t is the integral new catalyst volume amount calculated according to the design flue gas condition and performance requirement of the SCR denitration device, m ³, k _j is the activity attenuation coefficient and percent of the reserved jth layer catalyst, Q _j is the volume amount of the reserved jth layer catalyst, m ³, and correcting the volume amount of the reserved layer catalyst according to the ash deposition abrasion condition of the catalyst in the denitration device if necessary.

Technical Field

the invention belongs to the field of industrial waste gas purification, environmental protection and energy, and particularly relates to an SCR denitration catalyst replacement volume accounting method based on activity detection.

Background

Currently, the most widely applied flue gas denitration technology of the coal-fired power plant is a Selective Catalytic Reduction (SCR) denitration technology, and a catalyst is the core of SCR denitration operation. With the extension of the operation time of the denitration device, the performance of the denitration catalyst is gradually attenuated due to blockage, abrasion, poisoning and the like, and when the performance of the catalyst cannot meet the operation requirement of the denitration device, the catalyst needs to be replaced. How to determine the volume of the replaced catalyst is important for the long-term stable and reliable operation of the denitration device, and is a technical problem which is urgently needed to be solved in the technical field of the current coal-fired flue gas denitration.

based on the situation and the current situation, the invention provides an SCR denitration catalyst replacement volume accounting method based on detection activity, which has the characteristics of system, accuracy and strong operability, and can generate obvious environmental protection benefits and economic benefits.

the patent related to the present invention, for example, chinese patent publication No. 104318120a entitled "method and apparatus for determining the life of a catalyst in an SCR denitration system", is to determine the life of an SCR denitration catalyst by fitting and calculating catalyst operating parameters with data in an expert database, but this method can only determine the life of the catalyst, and cannot determine the volume amount of the catalyst that needs to be replaced after the life of the catalyst has expired.

Disclosure of Invention

the invention aims to provide a detection activity-based SCR denitration catalyst replacement volume accounting method aiming at the problem that the replacement volume cannot be effectively determined after the service life of the current SCR denitration catalyst is expired.

The technical scheme adopted by the invention for solving the problems is as follows: a detection activity-based SCR denitration catalyst replacement volume accounting method is characterized by comprising the following steps: calculating the activity attenuation coefficient of each layer of catalyst by detecting the activity of a newly-installed SCR denitration catalyst and an in-service catalyst, and calculating and determining the volume amount of the catalyst to be replaced after the service life of the catalyst is over on the basis;

the detection of the activity of the catalyst refers to that aiming at each layer of catalyst newly installed and in service in the SCR denitration device, the activity K value of the catalyst is calculated through a formula (1) by detecting the concentration of NOx at an inlet and an outlet of the catalyst under the conditions of designed flue gas conditions and ammonia nitrogen molar ratio of 1.05;

Wherein K is the activity of the catalyst, m/h, A _V is the surface speed, m/h, C _in is the concentration (dry basis, reference oxygen content) of NOx at the inlet of the SCR denitration reactor, mu L/L, and C _out is the concentration (dry basis, reference oxygen content) of NOx at the outlet of the SCR denitration reactor, mu L/L;

calculating the activity attenuation coefficient of each layer of catalyst through a formula (2) according to the activity of the newly-installed catalyst and the catalyst in service;

Wherein K _i is the activity attenuation coefficient of the catalyst of the i-th layer,%, K _z is the detection activity of the in-service catalyst, m/h, and K ₀ is the detection activity of the new catalyst, m/h;

when detecting that the integral denitration efficiency, ammonia escape concentration and SO ₂/SO ₃ conversion rate of the multilayer catalyst in the denitration device can not meet the performance requirements under the designed flue gas condition, preferentially considering the layer of catalyst with the minimum activity attenuation coefficient to be replaced, and calculating and determining the replacement amount of the catalyst according to the formula (3);

The method comprises the following steps of obtaining a denitration device, wherein Q _s is the catalyst replacement volume amount, m ³, Q _t is the integral new catalyst volume amount calculated according to the design flue gas condition and performance requirement of the SCR denitration device, m ³, k _j is the activity attenuation coefficient and percent of the reserved jth layer catalyst, Q _j is the volume amount of the reserved jth layer catalyst, m ³, and correcting the volume amount of the reserved layer catalyst according to the ash deposition abrasion condition of the catalyst in the denitration device if necessary.

Compared with the prior art, the invention has the following advantages and effects: by adopting the method, the volume of the catalyst can be accurately estimated and calculated, the replacement management work of the catalyst can be effectively guided, the long-term stable operation of the denitration device can be ensured, and the method has good environmental protection and economic benefits and wide application prospect.

Detailed Description

the present invention is further illustrated by the following examples, which are illustrative of the present invention and are not to be construed as being limited thereto.

in the method for calculating the replacement volume of the SCR denitration catalyst based on the detection activity, the activity attenuation coefficient of each layer of catalyst is calculated by detecting the activity of a newly-installed SCR denitration catalyst and an in-service catalyst, and the volume of the catalyst to be replaced after the service life of the catalyst is expired is calculated and determined on the basis;

Detecting the activity of the catalyst, namely calculating the activity K value of the catalyst by detecting the concentration of NOx at an inlet and an outlet of the catalyst according to a formula (1) under the conditions of designed flue gas conditions and the ammonia nitrogen molar ratio of 1.05 aiming at each layer of newly installed and in-service catalyst of the SCR denitration device;

wherein K is the activity of the catalyst, m/h, A _V is the surface speed, m/h, C _in is the concentration (dry basis, reference oxygen content) of NOx at the inlet of the SCR denitration reactor, mu L/L, and C _out is the concentration (dry basis, reference oxygen content) of NOx at the outlet of the SCR denitration reactor, mu L/L;

Calculating the activity attenuation coefficient of each layer of catalyst through a formula (2) according to the activity of the newly-installed catalyst and the catalyst in service;

Wherein K _i is the activity attenuation coefficient of the catalyst of the i-th layer,%, K _z is the detection activity of the in-service catalyst, m/h, and K ₀ is the detection activity of the new catalyst, m/h;

When detecting that the integral denitration efficiency, ammonia escape concentration and SO ₂/SO ₃ conversion rate of the multilayer catalyst in the denitration device can not meet the performance requirements under the designed flue gas condition, preferentially considering the layer of catalyst with the minimum activity attenuation coefficient to be replaced, and calculating and determining the replacement amount of the catalyst according to the formula (3);

The method comprises the following steps of obtaining a denitration device, wherein Q _s is the catalyst replacement volume amount, m ³, Q _t is the integral new catalyst volume amount calculated according to the design flue gas condition and performance requirement of the SCR denitration device, m ³, k _j is the activity attenuation coefficient and percent of the reserved jth layer catalyst, Q _j is the volume amount of the reserved jth layer catalyst, m ³, and correcting the volume amount of the reserved layer catalyst according to the ash deposition abrasion condition of the catalyst in the denitration device if necessary.

the method comprises the steps that an SCR denitration device is configured on a 1000MW coal-fired unit of a certain power generation enterprise, before each layer of newly-installed SCR denitration catalyst is installed and used, activity detection is carried out under the conditions that the flue gas condition is designed and the ammonia nitrogen molar ratio is 1.05, then activity detection of a single-layer catalyst is carried out under the same conditions every year, the activity attenuation coefficient of the layer of catalyst is calculated, and meanwhile denitration efficiency, ammonia escape concentration and SO ₂/SO ₃ conversion rate of the whole catalyst are tested under the designed flue gas condition.

Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and modifications made by those skilled in the art without departing from the spirit and scope of the present invention are also within the scope of the present invention.