CN112748035B - Testing device and method for representing caking property of SCR denitration fly ash of power plant - Google Patents
Testing device and method for representing caking property of SCR denitration fly ash of power plant Download PDFInfo
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Abstract
The invention relates to a testing device and a method for representing the cohesiveness of SCR denitration fly ash of a power plant, wherein a lower ash device is communicated with a catalyst testing sample bin and then is communicated with a cloth bag ash collecting device, the cloth bag ash collecting device is communicated with the lower ash device through a check valve arranged below the cloth bag ash collecting device to form an airflow circulation channel, a variable frequency fan is arranged at the tail end of the testing device and is communicated with the cloth bag ash collecting device, a flow regulating valve is arranged between the catalyst comparing sample bin and the lower ash device and between the cloth bag ash collecting device and the variable frequency fan, after all fly ash is output from the lower ash device, the check valve is opened under the gravity, and the fly ash in the cloth bag ash collecting device flows to the catalyst testing sample bin again, and the circulation is started until the testing is finished. The invention discloses a testing device and a testing method for representing the caking property of SCR denitration fly ash of a power plant.
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 cohesiveness of SCR denitration fly ash of a power plant.
Background
The current SCR denitration catalyst is widely applied to coal-fired power plants and is the core of a denitration device. The most important deactivation of SCR denitration catalysts is due to the covering micropores and blocking of the channels of fly ash in the flue gas, and one of the most important factors is the fly ash cohesiveness. At present, only national standard GBT16913 is tested by using a vertical stretch-breaking method, and other fresh and effective methods.
Disclosure of Invention
The invention aims to provide a testing device and a method for representing the cohesiveness of SCR denitration fly ash of a power plant.
In order to achieve the above purpose and achieve the above technical effects, the invention adopts the following technical scheme:
the utility model provides a testing arrangement of characterization power plant SCR denitration flying dust cohesiveness, includes catalyst contrast sample storehouse, catalyst test sample storehouse, ash discharging device, sack ash collecting device, variable frequency fan, flow control valve and check valve, ash discharging device intercommunication catalyst test sample storehouse communicates the sack ash collecting device again, the sack ash collecting device communicates with ash discharging device through the check valve that its below set up, form air current circulation channel, variable frequency fan is placed at the testing arrangement end and is received ash collecting device with the sack and communicate, provide the negative pressure for testing arrangement, set up flow control valve respectively between catalyst contrast sample storehouse and the ash discharging device, between sack ash collecting device and the variable frequency fan, after all flying dust is exported from ash discharging device, the check valve is automatic to be opened under the effect of gravity, the fly ash that flows back to catalyst test sample storehouse in the sack ash collecting device, open the circulation, until the test is accomplished.
Further, the catalyst comparison sample bin and the catalyst test sample bin are vertically arranged and are used for simulating the condition that the actual flue gas is rolled with fly ash to flow through the catalyst.
Further, 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 channel between the catalyst comparison sample bin and the ash discharging device, and the second flow regulating valve is positioned on a fan air channel 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 adopting the testing device for representing the caking property of SCR denitration fly ash of the power plant according to any one of claims 1-3, and comprises the following steps:
1.1 Fly ash sample preparation
Taking actual operation ash samples from 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 Measurement of fly ash caking coefficient
The comparison sample and the catalyst test sample are respectively placed in a catalyst comparison sample bin and a catalyst test sample bin, the air flow containing the fly ash obtained in the step one is introduced into the test sample bin, the air flow not containing the fly ash obtained in the step one is introduced into the comparison sample bin at the same speed, the air flow is not introduced into the comparison sample bin, the air flow introducing time is 4-6 hours, and after the test is finished, the samples in the test sample bin and the comparison sample bin are taken out, respectively weighed and recorded, and the fly ash bonding coefficient is obtained through the test.
In the step 1.1), the actual operation ash sample is taken from the SCR denitration inlet and outlet of the power plant, and is filtered by a 80-100 mesh screen, dried for 3-5 hours at 105-110 ℃, and then is placed in a dryer for natural cooling, so as to prepare for measurement.
Further, in step 1.3), the fly ash binding coefficient is calculated according to the following formula:
N＝(M 2 /M 1 ×M 3 /M 4 -1)×100
wherein:
n: fly ash binding coefficient;
M 1 : catalyst test sample mass before test;
M 2 : weight of the catalyst test sample after testing;
M 3 : comparing the quality of the sample before testing;
M 4 : quality after test of the comparative sample.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a testing device and a testing method for representing the cohesiveness of SCR denitration fly ash of a power plant, wherein the testing device comprises a catalyst comparison sample bin, a catalyst testing 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 testing sample bin and then is 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 is communicated with the cloth bag ash collecting device to provide negative pressure for the testing device, the flow regulating valve is 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 cloth bag ash collecting device flows to the catalyst testing sample bin again, and the circulation is started until the testing is finished. The invention discloses a testing device and a testing method for representing the caking property of SCR denitration fly ash of a power plant.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The following embodiments of the present invention are described in detail so that the advantages and features of the present invention may be more readily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of the present invention.
As shown in fig. 1, a testing device for representing the cohesiveness 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 from escaping along the way, the catalyst comparison sample bin 1 and the catalyst test sample bin 2 are vertically arranged, the condition that actual flue gas is carried by the fly ash and flows through the catalyst is fully simulated, 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 and the variable frequency fan 5, the 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 the gravity, the flow of the fly ash in the cloth bag ash collecting device 4 is stopped, and the test sample is opened until the circulation time of the catalyst in the test sample bin 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, a laboratory-built test device for representing the cohesiveness of SCR denitration fly ash of the power plant is used for simulating the quality of the fly ash, which is adhered to a pore canal and an outer wall when the fly ash passes through a catalyst standard sample, at a specific air flow rate for a specific period of time, and the cohesiveness of the fly ash is evaluated by testing the poor front and rear quality of the catalyst standard sample. Theoretically, the higher the ash bond, the greater its adhesion quality through the catalyst.
1.1 Method for preparing fly ash sample
Referring to GBT16913-2008 of dust physical property test method, taking 1kg of actual operation ash sample from SCR denitration inlet and outlet of a power plant, removing impurities from the ash sample by 80-100 mesh (180 μm) standard sieve, drying at 105-110 ℃ for 3-5 h, and then placing in a dryer for natural cooling to prepare for measurement.
1.2 Standard catalyst sample preparation method
The catalysts used in power plants are mainly of two types: honeycomb and plate. In order to improve the practicability, the invention also discloses a manufacturing method of a plate type standard sample aiming at the power plant using the plate type catalyst.
The honeycomb catalyst adopts 18 holes, the aperture is 7.2mm, the wall thickness is 1mm, the section size is 50mm, and the length is 300mm; the plate catalyst was cut to the same regular standard as the honeycomb catalyst using a 7mm pitch.
Two identical samples with the same length and width are cut from the same standard sample of the honeycomb catalyst or the plate-type catalyst and are respectively used as a test sample and a comparison sample, and the test samples and the comparison samples are placed in a constant-temperature oven at 105+/-2 ℃ to be dried for 2 hours, taken out, naturally cooled to room temperature, weighed and recorded for standby.
1.3 Test parameters and flow
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, sealing the peripheries of the comparison sample and the test sample bin, respectively introducing air flows with the same flow rate into the catalyst comparison sample bin 1 and the catalyst test sample bin 2, wherein the air flow rate in an air duct 6 of a fan is 5m/s (close to the speed of actual flue gas flowing through a denitration catalyst), the air flow flowing through the catalyst test sample bin 2 contains fly ash actually selected by a power plant obtained in the step 1.1), the air flow flowing through the catalyst comparison sample bin 1 does not contain fly ash actually selected by the power plant obtained in the step 1.1), the air flow flowing through the catalyst comparison sample bin 1 does not contain fly ash, and the test duration is 4-6 h; after the test is completed, the two samples in the catalyst comparison sample bin 1 and the catalyst test sample bin 2 are taken out and weighed again, and the test sample needs to be prevented from dropping off the adhered fly ash.
The fly ash binding coefficient is obtained according to the following calculation formula:
N＝(M 2 /M 1 ×M 3 /M 4 -1)×100 (1)
wherein:
the fly ash cohesion coefficient obtained by the above calculation method reflects the cohesion of the catalyst sample by the unit mass of fly ash. The index reflects the relative cohesiveness of the fly ash, with a larger value for the coefficient of cohesiveness indicating a higher degree of cohesiveness of the fly ash, and a greater propensity for catalyst fouling and plugging. The adhesion coefficient of the SCR denitration fly ash is 0 to 1.5 percent, the adhesion is low, 1.5 to 3 percent is medium adhesion, and more than 3 percent is high adhesion. And (3) establishing a power plant denitration fly ash viscosity coefficient database for comprehensively evaluating the risk of catalyst ash blocking through mass data collection in a long term.
Taking 1kg of fly ash from SCR denitration inlet and outlet of A power plant for test, and testing sample M before test 1 613.345g, post test M 2 619.691g, comparative sample M before testing 3 607.799g, post test M 4 607.782g, substituted into formula (1) for calculation:
N A ＝(619.691/613.345×607.799/607.782)＝1.03％。
taking 1kg of fly ash from SCR denitration inlet and outlet of B power plant for test, and testing sample M before test 1 593.207g, post test M 2 615.533g, comparative sample M before testing 3 596.336g, post test M 4 596.314g, substituted into formula (1) for calculation:
N B ＝(615.533/593.207×596.336/596.314)＝3.76％。
according to the test results, the fly ash cohesiveness of the plant B is higher than that of the plant A, and if the specifications of the catalyst are the same, the risk of ash accumulation and blockage of the plant B is higher.
The part of the invention which is not specifically described is only required to adopt the prior art, and is not described in detail herein.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related arts are included in the scope of the present invention.
Claims (1)
1. The test method for representing the caking property of the SCR denitration fly ash of the power plant is characterized by adopting a test device for representing the caking property of the SCR denitration fly ash of the power plant to test, wherein the test device for representing the caking property of the SCR denitration fly ash of the 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, the catalyst comparison sample bin and the catalyst test sample bin are vertically arranged and are used for simulating the condition that actual flue gas is rolled to carry fly ash to flow through the catalyst, the ash discharging device is communicated with the catalyst test sample bin and then is 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 test device and is communicated with the cloth bag ash collecting device, providing negative pressure for the testing device, respectively arranging flow regulating valves between the catalyst comparison sample bin and the ash discharging device and between the cloth bag ash collecting device and the variable frequency fan, wherein the flow regulating valves comprise a first flow regulating valve and a second flow regulating valve, the first flow regulating valve is positioned on a fan air channel between the catalyst comparison sample bin and the ash discharging device, the second flow regulating valve is positioned on the fan air channel between the cloth bag ash collecting device and the variable frequency fan, the air flow rate in the fan air channel is regulated by the flow regulating valve, 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 to the catalyst testing sample bin again, and the circulation is started until the test is finished;
the method comprises the following steps:
1.1 Fly ash sample preparation
Taking actual operation ash samples from 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 Measurement of fly ash caking coefficient
The comparison sample and the catalyst test sample are respectively placed in a catalyst comparison sample bin and a catalyst test sample bin, the air flow containing the fly ash obtained in the step one is introduced into the test sample bin, the air flow not containing the fly ash obtained in the step one is introduced into the comparison sample bin at the same speed, the air flow rate in the fan air duct is 5m/s, the air flow introduction time is 4-6 h, and after the test is finished, the samples in the test sample bin and the comparison sample bin are taken out, respectively weighed and recorded, and the fly ash bonding coefficient is obtained through the test;
in the step 1.1), taking actual operation ash samples from an SCR denitration inlet and outlet of a power plant, sieving with a 80-100 mesh sieve, drying for 3-5 hours at 105-110 ℃, and then placing the obtained product in a dryer for natural cooling to prepare measurement;
in the step 1.2), two identical samples with the same length and width are cut from the same standard sample of the honeycomb catalyst or the plate-type catalyst and are respectively used as a test sample and a comparison sample, and are placed in a constant-temperature oven at 105+/-2 ℃ for drying for 2 hours, taken out, naturally cooled to room temperature, weighed and recorded for standby;
in the step 1.3), the fly ash bonding coefficient is calculated according to the following formula:
N＝(M 2 /M 1 ×M 3 /M 4 -1)×100
wherein:
n: fly ash binding coefficient;
M 1 : catalyst test sample mass before test;
M 2 : weight of the catalyst test sample after testing;
M 3 : comparing the quality of the sample before testing;
M 4 : comparing the quality of the sample after test;
the adhesion coefficient of the SCR denitration fly ash is 0 to 1.5 percent, the adhesion is low, 1.5 to 3 percent is medium adhesion, and more than 3 percent is high adhesion; and (3) establishing a power plant denitration fly ash viscosity coefficient database for comprehensively evaluating the risk of catalyst ash blocking through mass data collection in a long term.
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