CN109521139A - A kind of catalyst activity online test method - Google Patents

A kind of catalyst activity online test method Download PDF

Info

Publication number
CN109521139A
CN109521139A CN201811539194.7A CN201811539194A CN109521139A CN 109521139 A CN109521139 A CN 109521139A CN 201811539194 A CN201811539194 A CN 201811539194A CN 109521139 A CN109521139 A CN 109521139A
Authority
CN
China
Prior art keywords
catalyst
formula
nox concentration
ammonia
entrance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201811539194.7A
Other languages
Chinese (zh)
Inventor
禾志强
张叔禹
刘永江
赵全中
张志勇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BRANCH Co OF INNER MONGOLIA ELECTRIC POWER SCIENCE SEARCH INSTITUTE INNER MONGOLIA POWER (GROUP) Co Ltd
Inner Mongolia Electric Power Research Institute of Inner Mongolia Power Group Co Ltd
Original Assignee
BRANCH Co OF INNER MONGOLIA ELECTRIC POWER SCIENCE SEARCH INSTITUTE INNER MONGOLIA POWER (GROUP) Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BRANCH Co OF INNER MONGOLIA ELECTRIC POWER SCIENCE SEARCH INSTITUTE INNER MONGOLIA POWER (GROUP) Co Ltd filed Critical BRANCH Co OF INNER MONGOLIA ELECTRIC POWER SCIENCE SEARCH INSTITUTE INNER MONGOLIA POWER (GROUP) Co Ltd
Priority to CN201811539194.7A priority Critical patent/CN109521139A/en
Publication of CN109521139A publication Critical patent/CN109521139A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
    • G01N31/10—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using catalysis

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Molecular Biology (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)

Abstract

The invention discloses a kind of catalyst activity online test methods, comprising the following steps: determines the specific surface area of the catalyst number of plies, the volume of catalyst and catalyst；Acquire the inlet NOx concentration of denitrification apparatus, exit NOx concentration, ammonia spraying amount, exhaust gas volumn and the escaping of ammonia rate initial data；Calculate denitration efficiency；Whole substantial activity is calculated according to active correction factor.This patent utilizes the initial data of thermal power plant's on-line monitoring system; in non-stop-machine situation; estimate catalyst activity value; and it is modified using active modifying factor; catalyst actual performance can accurately be grasped; to propose the conductive suggestion of flue gas denitrification system optimization operation, the stabilization of denitrating system, reliable, economical operation are realized, have the advantages that detect at any time, is easy to detect, not influencing denitrating system efficient operation.

Description

A kind of catalyst activity online test method
Technical field
The present invention relates to a kind of detection method more particularly to a kind of catalyst activity online test methods, belong to environment guarantor Protect technical field.
Background technique
Selective catalytic reduction (SCR) is the mainstream technology of current coal steam-electric plant smoke denitration, and denitrating catalyst is thermoelectricity The core of factory's flue gas SCR denitration system.The activity of catalyst not only determines the operation conditions of denitration facility, but also to denitration The operating cost influence of system is huge, therefore, by reasonable reliable technological means, monitors on-line to catalyst activity, And stabilization of the conductive suggestion for SCR denitration system of operation is provided according to result, reliable, economical operation has important meaning Justice.
Catalyst activity is the relative value of the catalyst performance and fresh catalyst performance in actual motion, reflects reality The decline degree of catalyst life in operation.From reactor when the detection of catalyst activity at present is mainly overhauled by compressor emergency shutdown Interior progress catalyst sample block sampling, then carries out catalyst activity experiment in laboratory.Power plant generally by catalyst inspection when Between between be divided into 1 year, time interval is longer, is unfavorable for the variation that operations staff understands catalyst activity in time, is unfavorable for denitration system The efficient operation of system.
Summary of the invention
In order to solve shortcoming present in above-mentioned technology, the present invention provides a kind of catalyst activity on-line checking sides Method.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of catalyst activity on-line checking side Method, comprising the following steps:
A, scene determines the volume of the catalyst number of plies and catalyst；Time parameter and the catalysis are used by catalyst again The initial specific surface of agent, which is multiplied, is calculated the specific surface area of catalyst；
B, using the existing smoke on-line monitoring system of thermal power plant, inlet NOx concentration, the outlet NOx of denitrification apparatus are acquired Concentration, ammonia spraying amount, exhaust gas volumn and the escaping of ammonia rate initial data, and the place of abnormal data is removed to the initial data Reason；
C, calculate catalyst space velocities according to formula one: in formula, Q is exhaust gas volumn, and V is the volume of catalyst, and SV is catalyst Air speed；
SV=V/Q formula one
Denitration efficiency is calculated according to formula two: in formula, CEntranceFor inlet NOx concentration；COutletFor exit NOx concentration；η is denitration Efficiency；
η=100 × (CEntrance-COutlet)/COutletFormula two
Ammonia nitrogen molar ratio is calculated according to formula three: in formula, CNH3For the escaping of ammonia rate；CEntranceFor inlet NOx concentration；η is denitration Efficiency；MR is ammonia nitrogen molar ratio；
MR=2.705 × CNH3/CEntranceThe formula of+η/100 three
Calculate catalyst overall activity K according to formula four: in formula, SV is catalyst space velocities, and MR is ammonia nitrogen molar ratio, and η is Denitration efficiency；
K=0.5/SV/ln (MR/ (MR- η)/(1- η)) formula four
D, theoretical ammonia spraying amount G is calculated according to formula fiveIt is theoretical:
GIt is theoretical=Q × CEntrance× MR/2705000 formula five
In formula, Q is exhaust gas volumn, CEntranceFor inlet NOx concentration, MR is ammonia nitrogen molar ratio；
Again by theoretical ammonia spraying amount GIt is theoreticalThe practical ammonia spraying amount G obtained with thermal power plant's DCS systemOnlineIt is divided by, obtains active amendment Factor alpha, α=GIt is theoretical/GOnline；
The whole substantial activity K of denitrating catalystAmendment=K × α；K is catalyst overall activity, and α is correction factor.
This patent utilizes the initial data of thermal power plant's on-line monitoring system, and in non-stop-machine situation, estimation catalyst is living Property value, and be modified using active modifying factor, catalyst actual performance can be accurately grasped, to propose flue gas denitrification system The conductive suggestion for optimizing operation realizes the stabilization of denitrating system, reliable, economical operation, have can detect at any time, detection side Just, the advantages of not influencing denitrating system efficient operation.
Specific embodiment
The present invention will be further described in detail with reference to the specific embodiments.
A kind of catalyst activity online test method, comprising the following steps:
A, scene determines the volume of the catalyst number of plies and catalyst；Time parameter and the catalysis are used by catalyst again The initial specific surface of agent, which is multiplied, is calculated the specific surface area of catalyst；
B, using the existing smoke on-line monitoring system of thermal power plant, inlet NOx concentration, the outlet NOx of denitrification apparatus are acquired Concentration, ammonia spraying amount, exhaust gas volumn and the escaping of ammonia rate initial data, and the place of abnormal data is removed to the initial data Reason；
C, calculate catalyst space velocities according to formula one: in formula, Q is exhaust gas volumn, and V is the volume of catalyst, and SV is catalyst Air speed；
SV=V/Q formula one
Denitration efficiency is calculated according to formula two: in formula, CEntranceFor inlet NOx concentration；COutletFor exit NOx concentration；η is denitration Efficiency；
η=100 × (CEntrance-COutlet)/COutletFormula two
Ammonia nitrogen molar ratio is calculated according to formula three: in formula, CNH3For the escaping of ammonia rate；CEntranceFor inlet NOx concentration；η is denitration Efficiency；MR is ammonia nitrogen molar ratio；
MR=2.705 × CNH3/CEntranceThe formula of+η/100 three
Calculate catalyst overall activity K according to formula four: in formula, SV is catalyst space velocities, and MR is ammonia nitrogen molar ratio, and η is Denitration efficiency；
K=0.5/SV/ln (MR/ (MR- η)/(1- η)) formula four
D, theoretical ammonia spraying amount G is calculated according to formula fiveIt is theoretical:
GIt is theoretical=Q × CEntrance× MR/2705000 formula five
In formula, Q is exhaust gas volumn, CEntranceFor inlet NOx concentration, MR is ammonia nitrogen molar ratio；
Again by theoretical ammonia spraying amount GIt is theoreticalThe practical ammonia spraying amount G obtained with thermal power plant's DCS systemOnlineIt is divided by, obtains active amendment Factor alpha, α=GIt is theoretical/GOnline；
The whole substantial activity K of denitrating catalystAmendment=K × α；K is catalyst overall activity, and α is correction factor.
Existing denitrating catalyst sampling and testing is carried out in laboratory, and testing conditions can not real simulation actual motion The case where when situation, reaction condition tends to idealize when catalyst performance detection is tested, and flue gas flow distribution is compared with actual motion point Cloth is more uniform, and flue-gas temperature is catalysis reaction optimum temperature.When boiler smoke enters the SCR reactor of actual motion and experiment Flow distribution is different when the detection test of room catalyst performance, can generate flow deviation, have an impact to the result of catalyst activity；Its Secondary, laboratory carries out being to react optimal reaction temperature in catalysis when Catalyst Activating Test, and anti-locating for SCR when actual motion Answer temperature often off-target temperature.Therefore compared with prior art, the present invention having the beneficial effect that
(1) the catalyst denitration activity test under the conditions of unit operation conditions can be achieved；
(2) on-line testing of catalyst denitration activity is for single Benitration reactor, without the concern for the catalyst number of plies；
(3) on-line testing of catalyst denitration activity can reflect activity of the catalyst under true flue gas condition.
In conclusion the present invention can accurately grasp the comprehensive performance of catalyst, finding out influences what catalyst operated normally Factor, and reasonably adjusted in denitrating system operation, to realize the stabilization of denitrating system, economical operation.
Above embodiment is not limitation of the present invention, and the present invention is also not limited to the example above, this technology neck The variations, modifications, additions or substitutions that the technical staff in domain is made within the scope of technical solution of the present invention, also belong to this hair Bright protection scope.

Claims (1)

1. a kind of catalyst activity online test method, it is characterised in that: the described method comprises the following steps:
A, scene determines the volume of the catalyst number of plies and catalyst；Time parameter and the catalyst are used by catalyst again Initial specific surface, which is multiplied, is calculated the specific surface area of catalyst；
B, using the existing smoke on-line monitoring system of thermal power plant, acquire the inlet NOx concentration of denitrification apparatus, exit NOx concentration, The initial data of ammonia spraying amount, exhaust gas volumn and the escaping of ammonia rate, and the processing of regular data is removed out to the initial data；
C, calculate catalyst space velocities according to formula one: in formula, Q is exhaust gas volumn, and V is the volume of catalyst, and SV is catalyst space velocities；
SV=V/Q formula one
Denitration efficiency is calculated according to formula two: in formula, CEntranceFor inlet NOx concentration；COutletFor exit NOx concentration；η is denitration effect Rate；
η=100 × (CEntrance-COutlet)/COutletFormula two
Ammonia nitrogen molar ratio is calculated according to formula three: in formula, CNH3For the escaping of ammonia rate；CEntranceFor inlet NOx concentration；η is denitration efficiency； MR is ammonia nitrogen molar ratio；
MR=2.705 × CNH3/CEntranceThe formula of+η/100 three
Calculate catalyst overall activity K according to formula four: in formula, SV is catalyst space velocities, and MR is ammonia nitrogen molar ratio, and η is denitration Efficiency；
K=0.5/SV/ln (MR/ (MR- η)/(1- η)) formula four
D, theoretical ammonia spraying amount G is calculated according to formula fiveIt is theoretical:
GIt is theoretical=Q × CEntrance× MR/2705000 formula five
In formula, Q is exhaust gas volumn, CEntranceFor inlet NOx concentration, MR is ammonia nitrogen molar ratio；
Again by theoretical ammonia spraying amount GIt is theoreticalThe practical ammonia spraying amount G obtained with thermal power plant's DCS systemOnlineIt is divided by, obtains active correction factor D, α=GIt is theoretical/GOnline；
The whole substantial activity K of denitrating catalystAmendment=K × α；K is catalyst overall activity, and α is correction factor.
CN201811539194.7A 2018-12-17 2018-12-17 A kind of catalyst activity online test method Pending CN109521139A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811539194.7A CN109521139A (en) 2018-12-17 2018-12-17 A kind of catalyst activity online test method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811539194.7A CN109521139A (en) 2018-12-17 2018-12-17 A kind of catalyst activity online test method

Publications (1)

Publication Number Publication Date
CN109521139A true CN109521139A (en) 2019-03-26

Family

ID=65795454

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811539194.7A Pending CN109521139A (en) 2018-12-17 2018-12-17 A kind of catalyst activity online test method

Country Status (1)

Country Link
CN (1) CN109521139A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110298142A (en) * 2019-07-19 2019-10-01 国电环境保护研究院有限公司 A kind of denitrating catalyst operational characteristic index prediction technique based on measured data
CN111044667A (en) * 2019-12-10 2020-04-21 中国大唐集团科学技术研究院有限公司华中电力试验研究院 Method for evaluating activity of denitration system catalyst and method for correcting denitration efficiency
CN114460221A (en) * 2022-03-17 2022-05-10 触媒净化技术(南京)有限公司 Denitration process control method and system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104699061A (en) * 2015-03-10 2015-06-10 山东国电技术咨询有限公司 Online detection and ammonia spraying optimization control method for SCR denitration catalyst
CN106706836A (en) * 2017-01-18 2017-05-24 华电电力科学研究院 Online detection device and detection method of catalyst activity of SCR (selective catalytic reduction) denitrification system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104699061A (en) * 2015-03-10 2015-06-10 山东国电技术咨询有限公司 Online detection and ammonia spraying optimization control method for SCR denitration catalyst
CN106706836A (en) * 2017-01-18 2017-05-24 华电电力科学研究院 Online detection device and detection method of catalyst activity of SCR (selective catalytic reduction) denitrification system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
禾志强 等: "SCR烟气脱硝催化剂活性在线测试方法", 《内蒙古电力技术》 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110298142A (en) * 2019-07-19 2019-10-01 国电环境保护研究院有限公司 A kind of denitrating catalyst operational characteristic index prediction technique based on measured data
CN110298142B (en) * 2019-07-19 2023-01-03 国电环境保护研究院有限公司 Denitration catalyst process characteristic index prediction method based on measured data
CN111044667A (en) * 2019-12-10 2020-04-21 中国大唐集团科学技术研究院有限公司华中电力试验研究院 Method for evaluating activity of denitration system catalyst and method for correcting denitration efficiency
CN111044667B (en) * 2019-12-10 2022-06-21 中国大唐集团科学技术研究院有限公司华中电力试验研究院 Method for evaluating activity of denitration system catalyst and method for correcting denitration efficiency
CN114460221A (en) * 2022-03-17 2022-05-10 触媒净化技术(南京)有限公司 Denitration process control method and system

Similar Documents

Publication Publication Date Title
CN109521139A (en) A kind of catalyst activity online test method
CN102565274B (en) Modifying method for catalyst activity in power plant SCR (selective catalytic reduction) denitration system
CN102759931B (en) The control method of denitrating flue gas and device
KR20160122649A (en) System and method for injection control of urea in selective catalyst reduction
US7846405B2 (en) Method and apparatus for measuring and controlling selective catalytic reduction (SCR) emission control systems
US20170167349A1 (en) System and method for fault diagnosis in emission control system
KR101139601B1 (en) The chemical injection method of de-NOx system
CN110580936B (en) Method and system for predicting service life of medium-low temperature SCR denitration catalyst
CN105975789A (en) Ammonia-escaping-rate online obtaining method for desulfurization and denitrification control
CN103499671B (en) Method for testing activity of denitration catalyst of selective catalytic reduction (SCR) system of thermal power plant on site
CN111582639B (en) Denitration system running state evaluation system
CN103034208B (en) Thermal generation unit denitration electricity price method for supervising
CN111398512A (en) Catalyst performance detection system and detection method based on-site flue gas denitration device
Liu et al. A technical method to improve NOx/NH3 mixing ratio in SCR system and its engineering applications
CN107670474B (en) SNCR (selective non-catalytic reduction) denitration system control device and denitration control method
CN110433658B (en) Method for treating nitrogen oxide in multiple racks of diesel engine and implementation device
CN103529161A (en) Detection device and method for activity of catalyst of selective catalytic reduction method denitration system
US20180095063A1 (en) Methods and Systems for Testing Performance of a Catalyst Element
KR101533084B1 (en) Analysis And Monitoring System For Exhaust Gas Treatment Apparatus
CN110935302B (en) Dynamically adjustable flue ozone oxidation NOx control system and method
KR101708129B1 (en) Power plant with selective catalytic reduction system and control method for the smae
CN220276681U (en) SCR denitration system capable of accurately controlling ammonia spraying amount
CN106526064B (en) A kind of method of catalyst activity during dynamic detection SCR denitration
CN204389392U (en) A kind of gas-detecting device
KR20140102794A (en) The De-NOx system for combined LNG gas turbine exhaust gas

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20190326