CN107198946B - Method for judging blockage reason of air preheater in operation of denitration system of power plant - Google Patents

Method for judging blockage reason of air preheater in operation of denitration system of power plant Download PDF

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CN107198946B
CN107198946B CN201710537232.4A CN201710537232A CN107198946B CN 107198946 B CN107198946 B CN 107198946B CN 201710537232 A CN201710537232 A CN 201710537232A CN 107198946 B CN107198946 B CN 107198946B
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air preheater
pressure difference
inlet flue
flue
content
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CN107198946A (en
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王梅菊
何安頔
何健
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Datang Environment Industry Group Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/76—Gas phase processes, e.g. by using aerosols
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts

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Abstract

The invention discloses a method for judging the blockage reason of an air preheater in the operation of a denitration system of a power plant, which collects operation data in a blockage time section, and comprises an inlet flue SO2Content and air preheater flue gas pressure difference; continuously detecting the ammonia injection amount of the inlet flue to obtain the ammonia injection amount of the inlet flue in the blocking time section; according to inlet flue SO2The content and the pressure difference of the flue gas of the air preheater are obtained to obtain an inlet flue SO2The state relation curve of the content and the smoke pressure difference of the air preheater; obtaining a state relation curve of the ammonia injection amount of the inlet flue and the smoke pressure difference of the air preheater according to the ammonia injection amount of the inlet flue and the smoke pressure difference of the air preheater; to inlet flue SO2And analyzing a state relation curve of the content and the smoke pressure difference of the air preheater and a state relation curve of the ammonia injection amount of the inlet flue and the smoke pressure difference of the air preheater to determine the blockage reason of the air preheater. The invention has the beneficial effects that: the reason of the blockage of the air preheater does not need to be guessed theoretically, and accurate data evidence is obtained through data analysis, so that the main reason of the blockage of the air preheater is obtained.

Description

Method for judging blockage reason of air preheater in operation of denitration system of power plant
Technical Field
The invention relates to the technical field of denitration, in particular to a method for judging a blockage reason of an air preheater in the operation of a denitration system of a power plant.
Background
In the denitration project of the power plant, if the pressure difference of the air preheater is large, the blockage occurs because of SO passing through the air preheater2The ammonia gas and the hydrogen sulfate are chemically reacted to generate ammonium bisulfate,
disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a method for determining a blockage cause of an air preheater in a denitration system of a power plant, wherein the blockage cause of the air preheater is analyzed and determined by sufficient technical data support.
The invention provides a method for judging the blockage reason of an air preheater in the operation of a denitration system of a power plant, which comprises the following steps:
step 1, collecting unit operation data in a blockage time section including an inlet flue SO after an air preheater is blocked in the operation process of a denitration system2Content and air preheater flue gas pressure difference;
meanwhile, continuously detecting the ammonia injection amount of the inlet flue in the operation process of the denitration system, and acquiring the ammonia injection amount of the inlet flue in a blockage time section;
step 2, according to the inlet flue SO2Respectively drawing the inlet flue SO according to the content data and the air preheater flue gas pressure difference data2Obtaining a content histogram and a broken line graph of the flue gas pressure difference of the air preheater to obtain an inlet flue SO2The state relation curve of the content and the smoke pressure difference of the air preheater;
step 3, respectively drawing a histogram of the ammonia injection amount of the inlet flue and a line drawing of the smoke pressure difference of the air preheater according to the data of the ammonia injection amount of the inlet flue and the data of the smoke pressure difference of the air preheater to obtain a state relation curve of the ammonia injection amount of the inlet flue and the smoke pressure difference of the air preheater;
step 4, the inlet flue SO2Analyzing the state relation curve of the content and the smoke pressure difference of the air preheater and the state relation curve of the ammonia spraying amount of the inlet flue and the smoke pressure difference of the air preheater to determine the blockage reason of the air preheater.
As a further improvement of the invention, in step 1, when the operation data of the group database in the blockage time zone is collected, in the time zone, a time point is intercepted every 5 minutes to obtain the operation data in the zone.
As a further improvement of the invention, the smoke pressure difference of the air preheater is the pressure difference between the smoke side inlet of the air preheater and the smoke side outlet of the air preheater.
As a further improvement of the present invention, step 4 specifically includes:
in a step 401, a step of,according to inlet flue SO2Analyzing the state relation curve of the content and the pressure difference of the flue gas of the air preheater to analyze the SO in the inlet flue2The relationship between the content and the pressure difference of the flue gas of the air preheater;
step 402, analyzing the relation between the ammonia injection amount of the inlet flue and the smoke pressure difference of the air preheater according to a state relation curve of the ammonia injection amount of the inlet flue and the smoke pressure difference of the air preheater;
in step 403, the cause of the blockage of the air preheater is determined from the analysis data in steps 401 and 402.
As a further improvement of the present invention, in step 403, the determining the cause of the blockage of the air preheater includes:
if the fluctuation of the ammonia injection amount of the inlet flue causes the fluctuation of the pressure difference of the flue gas of the air preheater, the excessive ammonia injection amount in the denitration system is indicated to cause the generation of excessive ammonium bisulfate and block the air preheater;
if the inlet flue SO2The content fluctuation causes the fluctuation of the pressure difference of the flue gas of the air preheater, which indicates that the sulfur content of the coal for combustion is high, and more SO is generated2Gas generates more ammonium bisulfate to block the air preheater;
if the inlet flue SO2The content and the ammonia spraying amount of the inlet flue are fluctuated, which indicates that the inlet flue SO2The concentration distribution of the content and the ammonia injection amount of the inlet flue is not uniform, and SO is generated in a high-concentration area2And the gas and ammonia gas have more chemical reactions to generate more ammonium bisulfate, so that the air preheater is blocked.
The invention has the beneficial effects that:
the reason for the blockage of the air pre-heater is obtained by obtaining enough technical data and carrying out effective data analysis without theoretically guessing the reason for the blockage of the air pre-heater, and the method is high in data reliability and high in accuracy of judgment conclusion.
Drawings
FIG. 1 shows an inlet flue SO according to an embodiment of the present invention2The state relation curve of the content and the smoke pressure difference of the air preheater;
FIG. 2 is a state relationship curve of ammonia injection amount of the inlet flue and flue gas pressure difference of the air preheater according to the embodiment of the invention.
Detailed Description
The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.
The embodiment of the invention provides a method for judging the blockage reason of an air preheater in the operation of a denitration system of a power plant, which comprises the following steps:
step 1, collecting unit operation data in a blockage time section including an inlet flue SO after an air preheater is blocked in the operation process of a denitration system2Content and air preheater flue gas pressure difference; when the operation data of the group database in the blockage time zone is collected, in the time zone, a time point is intercepted every 5 minutes to obtain the operation data in the zone. The smoke pressure difference of the air preheater is the pressure difference between the smoke side inlet of the air preheater and the smoke side outlet of the air preheater.
Meanwhile, in the operation process of the denitration system, the ammonia injection amount of the inlet flue is continuously detected, and the ammonia injection amount data of the inlet flue in the blocking time section is obtained.
Step 2, according to the inlet flue SO2Respectively drawing the inlet flue SO according to the content data and the air preheater flue gas pressure difference data2Obtaining a content histogram and a broken line graph of the flue gas pressure difference of the air preheater to obtain an inlet flue SO2The state relation curve of the content and the smoke pressure difference of the air preheater;
step 3, respectively drawing a histogram of the ammonia injection amount of the inlet flue and a line drawing of the smoke pressure difference of the air preheater according to the data of the ammonia injection amount of the inlet flue and the data of the smoke pressure difference of the air preheater to obtain a state relation curve of the ammonia injection amount of the inlet flue and the smoke pressure difference of the air preheater;
step 4, the inlet flue SO2Analyzing the state relation curve of the content and the smoke pressure difference of the air preheater and the state relation curve of the ammonia spraying amount of the inlet flue and the smoke pressure difference of the air preheater to determine the blocking reason of the air preheater, and specifically comprising the following steps of:
step 401, according to the inlet flue SO2Analyzing the state relation curve of the content and the pressure difference of the flue gas of the air preheater to analyze the SO in the inlet flue2The relationship between the content and the pressure difference of the flue gas of the air preheater;
step 402, analyzing the relation between the ammonia injection amount of the inlet flue and the smoke pressure difference of the air preheater according to a state relation curve of the ammonia injection amount of the inlet flue and the smoke pressure difference of the air preheater;
step 403, determining the blockage reason of the air preheater from the analysis data in step 401 and step 402, specifically including:
if the fluctuation of the ammonia injection amount of the inlet flue causes the fluctuation of the pressure difference of the flue gas of the air preheater, the excessive ammonia injection amount in the denitration system is indicated to cause the generation of excessive ammonium bisulfate and block the air preheater;
if the inlet flue SO2The content fluctuation causes the fluctuation of the pressure difference of the flue gas of the air preheater, which indicates that the sulfur content of the coal for combustion is high, and more SO is generated2Gas generates more ammonium bisulfate to block the air preheater;
if the inlet flue SO2The content and the ammonia spraying amount of the inlet flue are fluctuated, which indicates that the inlet flue SO2The concentration distribution of the content and the ammonia injection amount of the inlet flue is not uniform, and SO is generated in a high-concentration area2And the gas and ammonia gas have more chemical reactions to generate more ammonium bisulfate, so that the air preheater is blocked.
Taking a certain engineering example data as an example, after a certain power plant denitration system operates for 20 days, the air preheater has large pressure difference and is blocked. Taking a point every five minutes from a large amount of operation data of the unit, and intercepting an inlet flue SO in a blockage time section of the air preheater2Content and air preheater flue gas pressure difference.
According to inlet flue SO2Respectively drawing the inlet flue SO according to the content data and the air preheater flue gas pressure difference data2Obtaining a content histogram and a broken line graph of the flue gas pressure difference of the air preheater to obtain an inlet flue SO2The state relation curve of the content and the smoke pressure difference of the air preheater is shown in figure 1.
Meanwhile, the ammonia injection amount of the inlet flue in the actual operation process is detected, and a histogram of the ammonia injection amount of the inlet flue and a line drawing of the smoke pressure difference of the air preheater are respectively drawn according to the ammonia injection amount of the inlet flue and the smoke pressure difference of the air preheater, so that a state relation curve of the ammonia injection amount of the inlet flue and the smoke pressure difference of the air preheater is obtained, and is shown in fig. 2.
Analyzing the data in fig. 1 and 2, it can be seen from fig. 1 that the pressure difference of the flue gas of the air preheater follows the inlet flue SO2The content changes sharply, the waveform is similar and the time delay phenomenon exists. Flue gas pressure difference and inlet flue SO of air preheater2The content has direct variation relation. As can be seen from FIG. 2, the pressure difference of the flue gas of the air preheater still changes sharply under the condition that the ammonia injection amount of the inlet flue is continuously stable and does not change. The flue gas pressure difference of the air preheater has no direct change relation with the ammonia injection amount of the inlet flue.
As can be seen, when the air preheater is blocked, the differential pressure of the air preheater follows the SO2The variation of (2) is increased like the waveform variation. The reason for the blockage of the air preheater is shown to be caused by burning coal with high sulfur content. And other reasons such as uneven flow field of the denitration system or excessive ammonia spraying are eliminated.
Later proved, the inlet flue SO2In a time period with large content fluctuation, the flue gas inlet SO2The concentration is as high as 5600mg/Nm3Far exceeds the design value of 4125mg/Nm3，SO2The increased concentration results in the reaction of ammonia gas with SO2 to form ammonium bisulfate (formula NH)3+SO2+H2O＝NH4HSO3) (ii) a At the same time, SO2The increase in concentration results in a change in SO2/SO3SO generated in the flue gas at the outlet of the denitration device under the condition that the conversion rate is less than 1 percent3Will increase the total amount of ammonia and SO3The reaction is carried out to generate ammonium bisulfate (the reaction formula is NH)3+SO3+H2O＝NH4HSO4) And more ammonium bisulfate is simultaneously bonded with fly ash in the flue to cause the blockage of the air preheater and form vicious circle adhesion, so that the smoke pressure difference of the air preheater is increased.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (3)

1. A method for judging the blockage reason of an air preheater in the operation of a denitration system of a power plant is characterized by comprising the following steps of:
step 1, collecting unit operation data in a blockage time section including an inlet flue SO after an air preheater is blocked in the operation process of a denitration system2Content and air preheater flue gas pressure difference;
meanwhile, continuously detecting the ammonia injection amount of the inlet flue in the operation process of the denitration system, and acquiring the ammonia injection amount of the inlet flue in a blockage time section;
step 2, according to the inlet flue SO2Respectively drawing the inlet flue SO according to the content data and the air preheater flue gas pressure difference data2Obtaining a content histogram and a broken line graph of the flue gas pressure difference of the air preheater to obtain an inlet flue SO2The state relation curve of the content and the smoke pressure difference of the air preheater;
step 3, respectively drawing a histogram of the ammonia injection amount of the inlet flue and a line drawing of the smoke pressure difference of the air preheater according to the data of the ammonia injection amount of the inlet flue and the data of the smoke pressure difference of the air preheater to obtain a state relation curve of the ammonia injection amount of the inlet flue and the smoke pressure difference of the air preheater;
step 4, the inlet flue SO2Analyzing the state relation curve of the content and the smoke pressure difference of the air preheater and the state relation curve of the ammonia spraying amount of the inlet flue and the smoke pressure difference of the air preheater to determine the blocking reason of the air preheater, wherein the method comprises the following steps:
step 401, according to the inlet flue SO2Analyzing the state relation curve of the content and the pressure difference of the flue gas of the air preheater to analyze the SO in the inlet flue2The relationship between the content and the pressure difference of the flue gas of the air preheater;
step 402, analyzing the relation between the ammonia injection amount of the inlet flue and the smoke pressure difference of the air preheater according to a state relation curve of the ammonia injection amount of the inlet flue and the smoke pressure difference of the air preheater;
in step 403, from the analysis data in step 401 and step 402, the jam cause of the air preheater is determined:
if the fluctuation of the ammonia injection amount of the inlet flue causes the fluctuation of the pressure difference of the flue gas of the air preheater, the excessive ammonia injection amount in the denitration system is indicated to cause the generation of excessive ammonium bisulfate and block the air preheater;
if the inlet flue SO2The content fluctuation causes the fluctuation of the pressure difference of the flue gas of the air preheater, which indicates that the sulfur content of the coal for combustion is high, and more SO is generated2Gas generates more ammonium bisulfate to block the air preheater;
if the inlet flue SO2The content and the ammonia spraying amount of the inlet flue are fluctuated, which indicates that the inlet flue SO2The concentration distribution of the content and the ammonia injection amount of the inlet flue is not uniform, and SO is generated in a high-concentration area2And the gas and ammonia gas have more chemical reactions to generate more ammonium bisulfate, so that the air preheater is blocked.
2. The method according to claim 1, wherein in step 1, when the operation data of the team database in the time zone before and after the jam time is collected, a time point is intercepted every 5 minutes in the time zone to obtain the operation data in the time zone.
3. The method according to claim 1, wherein the air preheater flue gas pressure difference is a pressure difference between an air preheater flue gas side inlet and an air preheater flue gas side outlet.
CN201710537232.4A 2017-07-04 2017-07-04 Method for judging blockage reason of air preheater in operation of denitration system of power plant Expired - Fee Related CN107198946B (en)

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Publication number Priority date Publication date Assignee Title
WO2015103823A1 (en) * 2014-01-07 2015-07-16 霍特安热能技术（江苏）有限公司 Combined air preheater suitable for post-scr denitration, and anti-corrosion and anti-blocking method

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