CN112748035A - Testing device and method for representing adhesion of SCR denitration fly ash of power plant - Google Patents
Testing device and method for representing adhesion of SCR denitration fly ash of power plant Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 101
- 239000010881 fly ash Substances 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title abstract description 12
- 239000003054 catalyst Substances 0.000 claims abstract description 73
- 239000002956 ash Substances 0.000 claims abstract description 70
- 230000001105 regulatory effect Effects 0.000 claims abstract description 24
- 239000004744 fabric Substances 0.000 claims abstract description 22
- 230000005484 gravity Effects 0.000 claims abstract description 5
- 239000000523 sample Substances 0.000 claims description 87
- 230000000052 comparative effect Effects 0.000 claims description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 239000003546 flue gas Substances 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 238000010998 test method Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 239000013068 control sample Substances 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 108700018263 Brassica oleracea SCR Proteins 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 claims 1
- 238000007599 discharging Methods 0.000 description 14
- 238000001035 drying Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005464 sample preparation method Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
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Abstract
本发明一种表征电厂SCR脱硝飞灰粘结性的测试装置及方法，下灰装置连通催化剂测试样品仓再连通布袋收灰装置，布袋收灰装置通过其下方设置的止回阀与下灰装置连通，形成气流循环通道，变频风机放置在测试装置末端并与布袋收灰装置连通，催化剂对比样品仓与下灰装置之间、布袋收灰装置与变频风机之间设流量调节阀门，待所有飞灰从下灰装置输出后，止回阀在重力下打开，布袋收灰装置内的飞灰重新流向催化剂测试样品仓，开启循环，直到测试结束。本发明公开了一种表征电厂SCR脱硝飞灰粘结性的测试装置及方法，通过测试催化剂样品前后质量差，评估飞灰粘结性，方法简单、有效，可建立电厂脱硝飞灰粘性系数数据库，用于综合评价催化剂堵灰风险。
The invention provides a test device and method for characterizing the cohesiveness of SCR denitration fly ash in a power plant. The ash lowering device is connected to a catalyst test sample bin and then connected to a cloth bag ash collecting device. Connected to form an air circulation channel, the variable frequency fan is placed at the end of the test device and communicated with the bag ash collecting device. A flow regulating valve is set between the catalyst comparison sample bin and the ash lowering device, and between the cloth bag ash collecting device and the variable frequency fan. After the ash is output from the ash removal device, the check valve is opened under gravity, and the fly ash in the bag ash collection device flows to the catalyst test sample chamber again, and the cycle is opened until the end of the test. The invention discloses a test device and method for characterizing the cohesiveness of SCR denitration fly ash in a power plant. By testing the poor quality of catalyst samples before and after, the cohesion of fly ash can be evaluated. , which is used to comprehensively evaluate the risk of catalyst fouling.
Description
Technical Field
The invention belongs to the technical field of SCR denitration catalysts, and particularly relates to a testing device and method for representing the caking property of SCR denitration fly ash of a power plant.
Background
The SCR denitration catalyst is generally applied to a coal-fired power plant at present and is the core of a denitration device. The most important reasons for the deactivation of the SCR denitration catalyst are the covering of micropores and the clogging of the channels by fly ash in the flue gas, and one of the most important factors is fly ash cohesiveness. At present, only the national standard GBT 169913 uses a vertical snapping method, and other methods are rarely effective for testing.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention aims to provide a testing device and method for representing the caking property of SCR denitration fly ash of a power plant.
In order to achieve the purpose and achieve the technical effect, the invention adopts the technical scheme that:
a testing device for representing the caking property of SCR denitration fly ash in a power plant comprises a catalyst comparison sample bin, a catalyst test sample bin, an ash discharging device, a cloth bag ash collecting device, a variable frequency fan, a flow regulating valve and a check valve, wherein the ash discharging device is communicated with the catalyst test sample bin and then communicated with the cloth bag ash collecting device, the cloth bag ash collecting device is communicated with the ash discharging device through the check valve arranged below the cloth bag ash collecting device to form an airflow circulation channel, the variable frequency fan is arranged at the tail end of the testing device and communicated with the cloth bag ash collecting device to provide negative pressure for the testing device, the flow regulating valves are respectively arranged between the catalyst comparison sample bin and the ash discharging device and between the cloth bag ash collecting device and the variable frequency fan, after all fly ash is output from the ash discharging device, the check valve is automatically opened under the action of gravity, the fly ash in the cloth bag ash collecting device flows, until the test is finished.
Furthermore, the catalyst comparison sample bin and the catalyst test sample bin are vertically arranged and used for simulating the condition that the actual flue gas carries the fly ash to flow through the catalyst.
Furthermore, the flow regulating valve comprises a first flow regulating valve and a second flow regulating valve, the first flow regulating valve is positioned on a fan air duct between the catalyst comparison sample bin and the ash discharging device, and the second flow regulating valve is positioned on a fan air duct between the cloth bag ash collecting device and the variable frequency fan.
The invention discloses a testing method for representing the caking property of SCR denitration fly ash of a power plant, which is obtained by testing the testing device for representing the caking property of the SCR denitration fly ash of the power plant according to any one of claims 1 to 3, and comprises the following steps:
1.1) fly ash sampling
Taking an actual operation ash sample at an SCR denitration inlet and outlet of a power plant, removing impurities, drying, and naturally cooling for later use;
1.2) sample preparation
Preparing a catalyst test sample and a comparison sample, drying, naturally cooling, weighing at room temperature and recording;
1.3) determination of fly ash binding coefficient
And (2) respectively placing a comparison sample and a catalyst test sample in a catalyst comparison sample bin and a catalyst test sample bin, introducing airflow containing the fly ash obtained in the step I into the comparison sample bin at the same speed, wherein the fly ash is not contained in the comparison sample bin, the airflow introducing time is 4-6 h, taking out the samples in the test sample bin and the comparison sample bin after the test is finished, respectively weighing and recording, and testing to obtain the fly ash bonding coefficient.
Further, in the step 1.1), taking an actual operation ash sample at an SCR denitration inlet and outlet of a power plant, screening the operation ash sample by using a screen of 80-100 meshes, drying the operation ash sample for 3-5 hours at 105-110 ℃, naturally cooling the operation ash sample in a dryer, and preparing for measurement.
Further, in step 1.3), the fly ash binding coefficient is calculated according to the following formula:
N＝(M2/M1×M3/M4-1)×100
in the formula:
n: fly ash binding coefficient;
M1: pre-test mass of catalyst test sample;
M2: post-test weight of catalyst test sample;
M3: comparing the quality of the sample before testing;
M4: the post-test quality of the samples was compared.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a testing device and a method for representing the caking property of SCR denitration fly ash in a power plant, wherein the testing comprises a catalyst comparison sample bin, a catalyst test sample bin, an ash discharging device, a cloth bag ash collecting device, a variable frequency fan, a flow regulating valve and a check valve, the ash discharging device is communicated with the catalyst test sample bin and then communicated with the cloth bag ash collecting device, the cloth bag ash collecting device is communicated with the ash discharging device through the check valve arranged below the cloth bag ash collecting device to form an airflow circulating channel, the variable frequency fan is arranged at the tail end of the testing device and communicated with the cloth bag ash collecting device to provide negative pressure for the testing device, the flow regulating valves are respectively arranged between the catalyst comparison sample bin and the ash discharging device and between the cloth bag ash collecting device and the variable frequency fan, after all fly ash is output from the ash discharging device, the check valve is automatically opened under the action of gravity, and the fly ash in the, a loop is started until the test is finished. The invention discloses a testing device and a testing method for representing the caking property of SCR denitration fly ash in a power plant.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention is provided to enable those skilled in the art to more easily understand the advantages and features of the present invention, and to clearly and clearly define the scope of the present invention.
As shown in figure 1, a testing device for representing the caking property of SCR denitration fly ash in a power plant comprises a catalyst comparison sample bin 1, a catalyst test sample bin 2, an ash discharging device 3, a cloth bag ash collecting device 4, a variable frequency fan 5, a fan air duct 6, a flow regulating valve and a check valve 7, wherein the variable frequency fan 5 is arranged at the tail end of the testing device, the whole testing device adopts a negative pressure mode to prevent fly ash along the process from escaping, the catalyst comparison sample bin 1 and the catalyst test sample bin 2 are vertically arranged to fully simulate the condition that the fly ash is carried by actual flue gas and flows through a catalyst, the air flow rate in the fan air duct 6 is regulated through the flow regulating valve, the flow regulating valve comprises a first flow regulating valve 8 and a second flow regulating valve 9, the first flow regulating valve 8 is arranged on the fan air duct 6 between the catalyst comparison sample bin 1 and the ash discharging device 3, the second flow regulating valve 9 is arranged on the fan air duct 6 between the cloth bag ash collecting device 4, a check valve 7 is arranged below the cloth bag ash collecting device 4, after all the fly ash is output from the ash discharging device 3, the check valve 7 is automatically opened under the action of gravity, the fly ash in the cloth bag ash collecting device 4 flows to the catalyst test sample bin 2 again, and the circulation is started until the test time is finished.
According to the invention, a certain mass of actual operation ash sample is taken from a denitration inlet and a denitration outlet of a power plant, the mass of the ash adhered to a duct and the outer wall when the ash passes through a catalyst standard sample is tested through a testing device which is set up in a laboratory and represents the adhesion of SCR denitration fly ash of the power plant for a certain period of time at a certain air flow rate, and the adhesion of the fly ash is evaluated through testing the mass difference of the catalyst standard sample. Theoretically, the higher the ash cohesion, the greater its mass of adhesion through the catalyst.
1.1) fly ash sample preparation method
According to the dust physical property test method GBT 169913-2008, 1kg of actual operation ash sample is taken from an SCR denitration inlet and outlet of a power plant, impurities are removed from the ash sample through a standard sieve of 80-100 meshes (180 mu m), the ash sample is dried for 3-5 hours at 105-110 ℃, and then the ash sample is placed in a dryer for natural cooling to prepare for measurement.
1.2) Standard catalyst sample preparation method
There are two main types of catalysts used in power plants: honeycomb and plate. Most power plants use the honeycomb type, and the invention also discloses a manufacturing method of the plate type standard sample aiming at the power plants using the plate type catalyst for improving the practicability.
The honeycomb catalyst adopts 18 holes, the aperture is 7.2mm, the wall thickness is 1mm, the section size is 50 x 50mm, and the length is 300 mm; the plate catalyst was cut to the same regular standard as the honeycomb catalyst using a 7mm pitch.
Two same samples with the same length and width are cut from the same honeycomb catalyst or plate catalyst standard sample and are respectively used as a test sample and a comparison sample, the samples are placed in a constant-temperature oven at 105 +/-2 ℃ for drying for 2 hours, the samples are taken out and naturally cooled to room temperature, then the samples are weighed, and a record is made for later use.
1.3) testing parameters and procedures
Respectively loading a comparison sample and a test sample into a catalyst comparison sample bin 1 and a catalyst test sample bin 2 on a test bed, respectively introducing airflow with the same flow speed into the catalyst comparison sample bin 1 and the catalyst test sample bin 2 after four weeks of sealing, wherein the flow speed of the airflow in a fan air duct 6 is 5m/s (close to the speed of actual flue gas flowing through a denitration catalyst), the airflow flowing through the catalyst test sample bin 2 contains the fly ash actually selected in the power plant obtained in the step 1.1), the airflow flowing through the catalyst comparison sample bin 1 does not contain the fly ash actually selected in the power plant obtained in the step 1.1), the fly ash does not exist in the catalyst comparison sample bin 1, and the test duration is 4-6 hours; after the test, the two samples in the catalyst control sample bin 1 and the catalyst test sample bin 2 are taken out and weighed again, and the test samples need to be taken to prevent the adhered fly ash from falling off.
The fly ash binding coefficient is obtained according to the following calculation formula:
N＝(M2/M1×M3/M4-1)×100 (1)
in the formula:
the fly ash binding coefficient obtained by the above calculation method reflects the binding property of the fly ash per unit mass through the catalyst sample. The index reflects the relative caking property of the fly ash, and the larger the numerical value of the caking coefficient is, the higher the caking degree of the fly ash is, and the more easily the catalyst deposition and blockage are caused. The bonding coefficient of the SCR denitration fly ash is 0-1.5%, the bonding coefficient is low bonding, 1.5% -3% is medium bonding, and the bonding coefficient is high bonding when the bonding coefficient is more than 3%. And (3) establishing a power plant denitration fly ash viscosity coefficient database for comprehensively evaluating the risk of catalyst ash blockage through mass data collection in a long term.
Taking 1kg of fly ash at SCR denitration inlet and outlet of A power plant for testing, and testing a sample M before testing1613.345g, M after test2619.691g, comparative sample M before testing3607.799g, M after test4607.782g, substituting into the formula(1) And (3) calculating:
NA＝(619.691/613.345×607.799/607.782)＝1.03％。
taking 1kg of fly ash at SCR denitration inlet and outlet of B power plant for testing, and testing a sample M before testing1593.207g, M after test2615.533g, comparative sample M before testing3596.336g, M after test4596.314g, calculated by substituting equation (1):
NB＝(615.533/593.207×596.336/596.314)＝3.76％。
according to the test results, the fly ash caking property of the B power plant is higher than that of the A power plant, and if the specifications of the catalyst are the same, the risk of ash deposition and blockage of the B power plant is higher.
The parts of the invention not specifically described can be realized by adopting the prior art, and the details are not described herein.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112686492A (en) * | 2020-11-18 | 2021-04-20 | 苏州西热节能环保技术有限公司 | Method for comprehensively evaluating ash blocking risk of SCR denitration catalyst of power plant |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112686492A (en) * | 2020-11-18 | 2021-04-20 | 苏州西热节能环保技术有限公司 | Method for comprehensively evaluating ash blocking risk of SCR denitration catalyst of power plant |
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