CN115932178A - Fixed source flue gas heat tracing direct mercury pumping on-line continuous monitoring system and method - Google Patents
Fixed source flue gas heat tracing direct mercury pumping on-line continuous monitoring system and method Download PDFInfo
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Abstract
The invention provides a fixed source flue gas heat tracing straight mercury pumping on-line continuous monitoring system and a method, wherein the detection system comprises a sampling gun, a first reaction unit, a second reaction unit and a detection assembly, the sampling gun is provided with an air pumping end and an air exhausting end, the air pumping end is connected with a fixed source so as to pump flue gas in the fixed source, the air exhausting end is selectively communicated with a first end of the first reaction unit and a first end of the second reaction unit, the first reaction unit is used for converting gaseous bivalent mercury in the flue gas into gaseous elemental mercury, the second reaction unit is used for adsorbing the gaseous bivalent mercury in the flue gas, and the detection assembly is communicated with a second end of the first reaction unit and a second end of the second reaction unit so as to detect the content of the gaseous elemental mercury discharged from the first reaction unit and the content of the gaseous elemental mercury discharged flue gas after adsorbing the gaseous bivalent mercury discharged from the second reaction unit. The fixed source flue gas heat tracing direct mercury pumping on-line continuous monitoring system has the advantages of convenience in operation and accurate measurement result.
Description
Technical Field
The invention belongs to the technical field of environmental protection and pollutant emission monitoring, and particularly relates to a fixed source flue gas heat tracing direct mercury extraction online continuous monitoring system and method.
Background
Mercury pollution is highly toxic, persistent, global, and bioaccumulating. The industrial monitoring system is mainly used for monitoring the mercury in the atmosphere, and is also a key industry for monitoring the mercury.
For the mercury emission on-line monitoring, the key is to accurately master the change rule of the mercury emission concentration of a fixed source in real time so as to accurately obtain the total mercury emission measurement amount, but the mercury concentration of the fixed source is far lower than that of other conventional pollutants, and forms such as gaseous elemental mercury and gaseous divalent mercury exist. In the related technology, the mercury analyzer can only measure gaseous element mercury, and particulate matters, acid gas components, moisture, temperature fluctuation and the like in the fixed source flue gas can influence the measurement result, so that the measurement difficulty is very high.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the embodiment of the invention provides a fixed source flue gas heat tracing direct mercury pumping online continuous monitoring system which has the advantages of convenience in operation and accurate measurement result.
The embodiment of the invention provides an on-line continuous monitoring method for fixed source flue gas heat tracing direct mercury pumping, which has the advantages of convenience in operation and accurate measurement result.
The embodiment of the invention provides a fixed source flue gas heat tracing direct mercury pumping on-line continuous monitoring system, which comprises:
the sampling gun is provided with an air suction end and an air exhaust end, and the air suction end is connected with a fixed source so as to extract smoke in the fixed source;
the gas discharge end is selectively communicated with the first end of the first reaction unit and the first end of the second reaction unit, the first reaction unit is used for converting gaseous bivalent mercury in the flue gas into gaseous elemental mercury, and the second reaction unit is used for adsorbing the gaseous bivalent mercury in the flue gas;
and the detection assembly is communicated with the second end of the first reaction unit and the second end of the second reaction unit and is used for detecting the content of the gaseous elemental mercury discharged from the first reaction unit and the content of the gaseous elemental mercury in the flue gas discharged from the second reaction unit after the gaseous divalent mercury is adsorbed.
According to the fixed source flue gas heat tracing direct mercury pumping on-line continuous monitoring system, after flue gas pumped by a sampling gun is introduced into a first reaction unit, the total mercury concentration in the flue gas is detected by using a detection assembly; and after the flue gas that will sample the rifle and take out lets in the second reaction unit, utilize the detection subassembly to detect for the concentration of gaseous state element mercury in the flue gas, from this, utilize total mercury concentration to subtract the concentration of gaseous state element mercury, can obtain the concentration of gaseous state bivalent mercury.
Therefore, the monitoring system has the advantages of convenience in operation and accurate measurement result.
In some embodiments, the first reaction unit includes a first deacidification unit, a second deacidification unit and a high temperature reduction unit, a first end of the first deacidification unit and a first end of the second deacidification unit are both connected with the degassing end, a second end of the first deacidification unit and a second end of the second deacidification unit are both connected with a first end of the high temperature reduction unit, a second end of the high temperature reduction unit is connected with the detection assembly, and when the degassing end is communicated with the first deacidification unit, the degassing end and the second deacidification unit are blocked,
the first deacidification unit and the second deacidification unit are used for placing alkaline deacidification materials so as to be used for removing acid gases in flue gas,
the high-temperature reduction unit is used for placing reduction materials so as to convert gaseous divalent mercury in flue gas in the high-temperature reduction unit into gaseous elemental mercury.
In some embodiments, the sampling gun further comprises a filter element disposed within the sampling gun adjacent to the exhaust end.
In some embodiments, the flue gas purification device further comprises a mercury standard gas generator and a mercury standard gas conveying pipe, wherein a first end of the mercury standard gas conveying pipe is connected with the mercury standard gas generator, a second end of the mercury standard gas conveying pipe is connected with the sampling gun and is located at the upstream of the filter element, so that mercury in the flue gas extracted by the sampling gun can be marked, and comparison can be performed after the detection component is used for detecting the mercury content, so that the calibration on the mercury content of the flue gas can be realized.
In some embodiments, the sampling device further comprises a back-blowing air assembly, wherein the back-blowing air assembly comprises an air pump and a connecting pipe, a first end of the connecting pipe is connected with the air pump, and a second end of the connecting pipe is connected with the sampling gun and is positioned between the filtering piece and the port of the exhaust end; and/or the sampling gun further comprises a heat insulation layer, and the heat insulation layer is arranged on the outer wall surface of the sampling gun.
In some embodiments, the device further comprises a first heating element and a second heating element, wherein the first heating element is used for heating the first reaction unit so that the temperature of the first reaction unit is more than or equal to 400 ℃ and less than or equal to 800 ℃;
the second heating element is used for heating the second reaction unit so that the temperature of the second reaction unit is more than or equal to 120 ℃ and less than or equal to 200 ℃.
In some embodiments, the detection assembly comprises a mercury analyzer, a condenser, a flow detector and a vacuum pump which are connected in sequence,
the mercury analyzer is provided with a gas inlet which is connected with the first reaction unit and the second reaction unit so as to be used for detecting smoke discharged by the first reaction unit or the second reaction unit,
the condenser is used for drying the flue gas discharged by the mercury analyzer,
the flow detector is used for detecting the flow of the flue gas discharged by the condenser,
the vacuum pump is used for pumping out the smoke in the flow detector.
The method for the fixed source flue gas heat tracing direct mercury pumping on-line continuous monitoring is used for the fixed source flue gas heat tracing direct mercury pumping on-line continuous monitoring system in any one of the embodiments, and comprises the following steps:
s1, extracting smoke in a fixed source by using a sampling gun;
s2, introducing the extracted flue gas into a first reaction unit or a second reaction unit, wherein the flue gas in the first reaction unit can be converted from gaseous bivalent mercury into gaseous elemental mercury, and the flue gas in the second reaction unit can be used for removing the gaseous bivalent mercury;
s3, measuring the content of gaseous element mercury contained in the flue gas discharged by the first reaction unit or the second reaction unit by using a mercury analyzer;
s4, drying the smoke measured by the mercury analyzer by using a condenser;
s5, detecting the flue gas discharged by the condenser by using a flow measuring device;
s6, extracting the smoke detected by the flow measuring device by using a vacuum pump.
In some embodiments, the method comprises a first process and a second process, the first process comprises steps S1 to S6, and in step S2, the flue gas extracted by the sampling gun enters the first reaction unit, the second process comprises steps S1 to S6, and in step S2, the flue gas extracted by the sampling gun enters the second reaction unit, and the time for introducing the flue gas into the first reaction unit in the first process is the same as the time for introducing the flue gas into the second reaction unit in the second process.
In some embodiments, the first reaction unit includes a first deacidification unit, a second deacidification unit and a high-temperature reduction unit, and in S2 of the first process, the flue gas passes through the first deacidification unit or the second deacidification unit and then enters the high-temperature reduction unit to convert the gaseous divalent mercury into the gaseous elemental mercury.
Drawings
FIG. 1 is a fixed source flue gas heat tracing direct mercury extraction on-line continuous monitoring system according to an embodiment of the invention.
FIG. 2 is a fixed source flue gas heat tracing direct mercury extraction on-line continuous monitoring system according to an embodiment of the invention.
FIG. 3 is a flow chart of a fixed source flue gas heat tracing direct mercury extraction on-line continuous monitoring method according to an embodiment of the invention.
Reference numerals:
a stationary source 100; a delivery conduit 200; a first valve 300; a second valve 400;
a first reaction unit 21; a first deacidification unit 211; a second deacidification unit 212; a high temperature reduction unit 213;
a second reaction unit 31;
a detection assembly 4; a mercury analyzer 41; a condenser 42; a flow rate detector 43; a vacuum pump 44;
a filter member 5;
a mercury standard gas generator 61; a mercury marker gas delivery pipe 62;
a blowback air assembly 7; an air pump 71; a connecting pipe 72;
an insulating layer 8;
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.
As shown in fig. 1 and 2, an on-line continuous monitoring system for trace heating and mercury pumping of flue gas from a fixed source 100 according to an embodiment of the present invention includes: a sampling gun 1, a first reaction unit 21, a second reaction unit 31 and a detection assembly 4.
The sampling gun 1 has a suction end 11 and a discharge end 12, the suction end 11 being adapted to be connected to a stationary source 100 for drawing the flue gas from the stationary source 100. Specifically, the aspiration end 11 of the sampling gun 1 can be inserted inside the stationary source 100 to draw smoke from the stationary source 100.
The exhaust end 12 is selectively communicated with a first end of the first reaction unit 21 and a first end of the second reaction unit 31, the first reaction unit 21 is used for converting gaseous bivalent mercury in the flue gas into gaseous elemental mercury, and the second reaction unit 31 is used for adsorbing the gaseous bivalent mercury in the flue gas.
It can be understood that, when the exhaust end 12 is communicated with the first reaction unit 21, the flue gas can enter the first reaction unit 21 from the exhaust end 12, and the exhaust end 12 and the second reaction unit 31 are in a blocking state, that is, the flue gas in the sampling gun 1 cannot enter the second reaction unit 31. On the contrary, when the exhaust end 12 is communicated with the second reaction unit 31, the exhaust end 12 is blocked from the first reaction unit 21.
That is, when the exhaust end 12 is communicated with the first reaction unit 21, the flue gas in the sampling gun 1 enters the first reaction unit 21, and the gaseous divalent mercury in the flue gas in the first reaction unit 21 can be converted into gaseous elemental mercury, so that the total mercury concentration of the flue gas discharged from the first reaction unit 21 is detected by the detection assembly 4.
When the exhaust end 12 is communicated with the second reaction unit 31, the flue gas in the sampling gun 1 enters the second reaction unit 31, and gaseous divalent mercury in the flue gas in the second reaction unit 31 can be adsorbed by the second reaction unit 31, that is, the flue gas discharged by the second reaction unit 31 is the flue gas from which gaseous divalent mercury components are removed, so that the concentration of gaseous elemental mercury in the flue gas discharged by the second reaction unit 31 is detected by using the detection assembly 4.
Specifically, as shown in fig. 1, the exhaust end 12 of the sampling gun 1 is provided with a first valve 300, the first valve 300 is a three-way valve, an inlet of the first valve 300 is connected to the exhaust end 12, a first outlet of the first valve 300 is connected to the first reaction unit 21, and a second outlet of the first valve 300 is connected to the second reaction unit 31, so that the exhaust end 12 is selectively communicated with the first end of the first reaction unit 21 and the first end of the second reaction unit 31.
The first reaction unit 21 and the second reaction unit 31 are connected to the detection assembly 4 through a conveying pipeline 200, that is, an outlet of the first reaction unit 21 and an outlet of the second reaction unit 31 are connected to a first end of the conveying pipeline 200, and a second end of the conveying pipeline 200 is connected to the detection assembly 4, so as to convey the flue gas discharged from the first reaction unit 21 or the second reaction unit 31.
In the first reaction unit 21, materials for causing a reduction reaction are provided, for example: potassium sulfite to convert gaseous mercury divalent in the flue gas into gaseous elemental mercury in the first reaction unit 21. In the second reaction unit 31, materials for adsorbing gaseous divalent mercury, such as: calcium oxide to adsorb gaseous divalent mercury in the flue gas in the second reaction unit 31.
The detection assembly 4 is communicated with the second end of the first reaction unit 21 and the second end of the second reaction unit 31, and is used for detecting the content of gaseous elemental mercury in the flue gas discharged from the first reaction unit 21 and the content of gaseous elemental mercury in the flue gas discharged from the second reaction unit 31 after absorbing gaseous divalent mercury.
Specifically, as shown in fig. 1, the detection assembly 4 includes a mercury analyzer 41, a condenser 41, a flow detector 43 and a vacuum pump 44 connected in sequence, the mercury analyzer 41 has a gas inlet for connecting with the first reaction unit 21 and the second reaction unit 31 so as to detect the flue gas discharged from the first reaction unit 21 or the second reaction unit 31, the condenser 41 dries and cools the flue gas discharged from the mercury analyzer 41, and the flow detector 43 is used for detecting the flue gas discharged from the condenser 41.
It can be understood that the flue gas discharged from the first reaction unit 21 and the second reaction unit 31 can enter the mercury analyzer 41 through the gas inlet, the gas outlet of the mercury analyzer 41 is connected to the inlet of the condenser 41, so that the gas discharged from the mercury analyzer 41 enters the condenser 41 through the inlet of the condenser 41, the outlet of the condenser 41 is connected to the inlet of the flow monitor, the dried flue gas discharged from the condenser 41 can enter the flow monitor through the inlet of the flow monitor, so as to monitor the flow value of the flue gas by using the flow monitor, and the vacuum pump 44 is connected to the flow monitor, so that the flue gas in the flow monitor can be discharged when the vacuum pump 44 is activated.
The mercury analyzer 41 may be a zeeman effect analyzer, so as to eliminate interference of background gas (such as sulfur dioxide, nitrogen oxide, water, etc. in the flue gas) in the flue gas.
In other words, in the fixed source 100 flue gas heat tracing direct mercury extraction on-line continuous monitoring system according to the embodiment of the present invention, after the flue gas extracted by the sampling gun 1 is introduced into the first reaction unit 21, the total mercury concentration in the flue gas is detected by the detection component 4; after the flue gas extracted by the sampling gun 1 is introduced into the second reaction unit 31, the concentration of the gaseous mercury element in the flue gas is detected by the detection component 4, and therefore the concentration of the gaseous mercury element is subtracted from the total mercury concentration to obtain the concentration of the gaseous bivalent mercury. Wherein, the time for introducing the flue gas extracted by the sampling gun 1 into the first reaction unit 21 is equal to the time for introducing the flue gas extracted by the sampling gun 1 into the second reaction unit 31.
In addition, in the first reaction unit 21, the gaseous divalent mercury in the flue gas can be converted into gaseous elemental mercury so as to detect the total mercury concentration in the flue gas by the mercury analyzer 41, and in the second reaction unit 31, the gaseous divalent mercury in the flue gas can be removed so as to detect the concentration of gaseous elemental mercury in the flue gas by the mercury analyzer 41.
Therefore, the monitoring system has the advantages of convenience in operation and accurate measurement result.
In some embodiments, the first reaction unit 21 includes a first deacidification unit 211, a second deacidification unit 212 and a high temperature reduction unit 213, a first end of the first deacidification unit 211 and a first end of the second deacidification unit 212 are both connected to the exhaust end 12, a second end of the first deacidification unit 211 and a second end of the second deacidification unit 212 are both connected to a first end of the high temperature reduction unit 213, a second end of the high temperature reduction unit 213 is connected to the detection assembly 4, and when the exhaust end 12 is communicated with the first deacidification unit 211, the exhaust end 12 and the second deacidification unit 212 are blocked, the first deacidification unit 211 and the second deacidification unit 212 are both used for placing an alkaline deacidification material for removing acid gas in flue gas, and the high temperature reduction unit 213 is used for placing a reduction material for converting gaseous bivalent mercury in flue gas in the high temperature reduction unit 213 into gaseous elemental mercury.
Specifically, as shown in fig. 1 and 2, the first reaction unit 21 further includes a second valve 400, the second valve 400 is a three-way valve, an inlet of the second valve 400 is connected to a first outlet of the first valve 300, a first outlet of the second valve 400 is connected to the first deacidification unit 211, and a second outlet of the second valve 400 is connected to the second deacidification unit 212, so that when the degassing end 12 is communicated with the first deacidification unit 211, the degassing end 12 and the second deacidification unit 212 can be blocked by the second valve 400, and similarly, when the degassing end 12 is communicated with the second deacidification unit 212, the second valve 400 can block the degassing end 12 and the first deacidification unit 211.
It is understood that, for example, when the exhaust end 12 is in communication with the first deacidification unit 211, the amount of alkaline deacidification material in the first deacidification unit 211 decreases over time, and therefore, after a certain period of use, the second valve 400 may be used to communicate the exhaust end 12 with the second deacidification unit 212 to facilitate the addition or replacement of alkaline deacidification material in the first deacidification unit 211, further ensuring that gaseous mercury in the flue gas is converted into gaseous elemental mercury.
Wherein, the alkaline deacidification material can be hydrogen sulfide so as to remove acid gases such as sulfur dioxide, nitrogen oxides and the like in the flue gas, and the material participating in the reduction reaction can be potassium sulfite.
It should be noted that, the inventor found that, when the high temperature reduction unit is heated to 800 ℃, the high temperature reduction unit may not be added with reducing materials, that is, after the flue gas enters the high temperature reduction unit (heated to 800 ℃), the reduction reaction may directly occur.
In some embodiments, the fixed-source flue gas heat tracing straight mercury extraction online continuous monitoring system of the embodiment of the invention further comprises a filter 5, and the filter 5 is arranged in the sampling gun 1 and adjacent to the exhaust end 12 side.
It will be appreciated that the filter element 5, as shown in figure 2, can be made of a material with a filtering function and with mercury inertness, so as to filter the impurities in the fumes, such as dust, further improving the measurement result.
In some embodiments, the system for continuously monitoring the directly extracted mercury by the fixed-source flue gas heat tracing further comprises a mercury standard gas generator 61 and a mercury standard gas conveying pipe 62, wherein a first end of the mercury standard gas conveying pipe 62 is connected with the mercury standard gas generator 61, a second end of the mercury standard gas conveying pipe 62 is connected with the sampling gun 1 and is located upstream of the filter element 5, so that mercury in the flue gas extracted by the sampling gun 1 can be marked, and comparison can be performed after the detection component 4 is used for detecting the mercury content, so that the calibration of the mercury content of the flue gas can be realized.
In some embodiments, the fixed-source flue gas heat tracing straight mercury pumping on-line continuous monitoring system according to the embodiments of the present invention further includes a back-blowing air assembly 7, the back-blowing air assembly 7 includes an air pump 71 and a connecting pipe 72, a first end of the connecting pipe 72 is connected to the air pump 71, and a second end of the connecting pipe 72 is connected to the sampling gun 1 and is located between the filter 5 and the port of the exhaust end 12.
It can be understood that, as shown in fig. 2, when the air pump 71 is started, the air can be introduced into the sampling gun 1 through the connecting pipe 72, that is, when the air pump 71 is started, the first valve 300 blocks the first reaction unit 21 and the second reaction unit 31, and prevents the air generated by the air pump 71 from entering the first reaction unit 21 and the second reaction unit 31, so that the air can blow the impurities such as dust on the filter element 5 into the fixing source 100, thereby prolonging the service life of the filter element 5.
In some embodiments, the fixed-source flue gas heat tracing direct mercury pumping online continuous monitoring system of the embodiments of the present invention further includes an insulating layer 8, and the insulating layer 8 is disposed on an outer wall surface of the sampling gun 1.
Specifically, as shown in fig. 2, the insulating layer 8 can be disposed around the sampling gun 1 to keep the temperature inside the sampling gun 1 between 120 ℃ and 200 ℃, so as to prevent mercury from being adsorbed or undergoing morphological changes during the transportation process of the flue gas, thereby affecting the detection result. Preferably, the temperature inside the sampling gun 1 is kept at 180 ℃.
In some embodiments, the fixed-source flue gas heat tracing direct mercury pumping online continuous monitoring system of the embodiments of the present invention further includes a first heating element and a second heating element, the first heating element is used for heating the first reaction unit 21, so that the temperature of the first reaction unit 21 is greater than or equal to 400 ℃ and less than or equal to 800 ℃; the second heating member is used for heating the second reaction unit 31 so that the temperature of the second reaction unit 31 is 120 ℃ or higher and 200 ℃ or lower.
It is understood that in the first reaction unit 21, the reducing material placed in the high-temperature reduction unit 213 needs to be heated to a high temperature (i.e., 400-800 ℃) for better action, so that the first reaction unit 21 may be heated by the first heating member, preferably, the temperatures of the first deacidification unit 211 and the second deacidification unit 212 are maintained at 400 ℃ by the first heating member, and the temperature of the high-temperature reduction unit 213 is maintained at 800 ℃ by the first heating member, and at this time, the reducing material may not be added in the high-temperature reduction unit 213, so as to meet the requirement of the analysis and detection of the detection assembly 4, and also to prevent the adsorption and morphological change of mercury.
Preferably, the temperature inside the sampling gun 1, the temperature inside the second reaction unit 31, and the temperature of the transfer line are maintained at 180 ℃ using the second heating member.
In addition, it is preferable that the inner wall of the device (e.g., the sampling gun 1) which is in contact with the mercury-containing gas and operates at a temperature of 200 ℃ or less is made of a material inert to mercury, such as a glass coating or the like.
As shown in fig. 3, the method for continuously monitoring the fixed-source flue gas heat tracing direct mercury pumping on line according to the embodiment of the present invention is used in the system for continuously monitoring the fixed-source flue gas heat tracing direct mercury pumping on line according to any one of the above embodiments, and the method includes the following steps:
s1, extracting smoke in a fixed source by using a sampling gun.
S2, introducing the extracted flue gas into the first reaction unit or the second reaction unit, wherein the flue gas in the first reaction unit can be converted into gaseous elemental mercury from gaseous divalent mercury, and the flue gas can be used for removing the gaseous divalent mercury in the second reaction unit.
It can be understood that when the extracted flue gas is introduced into the first reaction unit, the flue gas cannot enter the second reaction unit, and similarly, when the flue gas enters the second reaction unit, the flue gas cannot enter the first reaction unit.
And S3, measuring the content of gaseous element mercury contained in the flue gas discharged by the first reaction unit or the second reaction unit by using a mercury analyzer. Wherein, the mercury analyzer can adopt a Zeeman effect analyzer so as to eliminate the interference of background gas in the smoke.
And S4, drying the smoke measured by the mercury analyzer by using a condenser.
And S5, detecting the dried flue gas flow by using a flow measuring device.
And S6, exhausting the smoke detected by the flow measuring device by using a vacuum pump.
In some embodiments, the fixed-source flue gas heat tracing direct mercury pumping online continuous monitoring method of the embodiments of the present invention includes a first process and a second process, the first process includes steps S1 to S6, in step S2, flue gas pumped by a sampling gun enters a first reaction unit, the second process includes steps S1 to S6, in step S2, flue gas pumped by the sampling gun enters a second reaction unit, and a time for introducing the flue gas into the first reaction unit in the first process is the same as a time for introducing the flue gas into the second reaction unit in the second process.
It can be understood that the difference between the first process and the second process lies in that in step S2, the flue gas extracted by the sampling gun is introduced into the first reaction unit or the second reaction unit, and it should be noted that the time for introducing the flue gas into the first reaction unit in the first process is the same as the time for introducing the flue gas into the second reaction unit in the second process, so as to ensure that the total amount of the flue gas detected by the detection assembly is the same, so that the total mercury concentration and the gaseous elemental mercury concentration are detected by the detection assembly under the condition of the same total amount of the flue gas, which facilitates the subsequent calculation of other mercury contents.
In some embodiments, the first reaction unit includes a first deacidification unit, a second deacidification unit and a high-temperature reduction unit, and in S2 of the first process, the flue gas passes through the first deacidification unit or the second deacidification unit and then enters the high-temperature reduction unit to convert the gaseous divalent mercury into the gaseous elemental mercury.
It can be understood that, all pack the alkaline deacidification material in first deacidification unit and the second deacidification unit, pack in the high temperature reduction unit and return raw and other materials, the flue gas can let in one of first deacidification unit and second deacidification unit to with this first deacidification unit and second deacidification unit one's alkaline deacidification material after taking place the reaction, in the rethread high temperature reduction unit to reduce gaseous bivalent mercury in the flue gas to gaseous element mercury.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" and the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although the above embodiments have been shown and described, it should be understood that they are exemplary and should not be construed as limiting the present invention, and that many changes, modifications, substitutions and alterations to the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (10)
1. A fixed source flue gas heat tracing direct mercury pumping on-line continuous monitoring system is characterized by comprising:
the sampling gun is provided with an air suction end and an air exhaust end, and the air suction end is connected with a fixed source so as to extract smoke in the fixed source;
the gas discharge end is selectively communicated with the first end of the first reaction unit and the first end of the second reaction unit, the first reaction unit is used for converting gaseous bivalent mercury in the flue gas into gaseous elemental mercury, and the second reaction unit is used for adsorbing the gaseous bivalent mercury in the flue gas;
and the detection assembly is communicated with the second end of the first reaction unit and the second end of the second reaction unit and is used for detecting the content of gaseous elemental mercury discharged from the first reaction unit and the content of gaseous elemental mercury in the flue gas discharged from the second reaction unit after gaseous divalent mercury is adsorbed.
2. The fixed-source flue gas heat-tracing straight mercury pumping on-line continuous monitoring system according to claim 1, wherein the first reaction unit comprises a first deacidification unit, a second deacidification unit and a high-temperature reduction unit, a first end of the first deacidification unit and a first end of the second deacidification unit are both connected with the exhaust end, a second end of the first deacidification unit and a second end of the second deacidification unit are both connected with a first end of the high-temperature reduction unit, a second end of the high-temperature reduction unit is connected with the detection assembly, and when the exhaust end is communicated with the first deacidification unit, the exhaust end and the second deacidification unit are blocked,
the first deacidification unit and the second deacidification unit are used for placing alkaline deacidification materials so as to be used for removing acid gases in flue gas,
the high-temperature reduction unit is used for placing a reduction material so as to convert gaseous divalent mercury in the flue gas in the high-temperature reduction unit into gaseous elemental mercury.
3. The fixed-source flue gas heat-tracing straight mercury extraction online continuous monitoring system of claim 1, further comprising a filter disposed within the sampling gun adjacent to the exhaust end side.
4. The fixed-source flue gas heat tracing direct mercury extraction online continuous monitoring system according to claim 3, further comprising a mercury standard gas generator and a mercury standard gas delivery pipe, wherein a first end of the mercury standard gas delivery pipe is connected with the mercury standard gas generator, and a second end of the mercury standard gas delivery pipe is connected with the sampling gun and is located upstream of the filter element, so that mercury in flue gas extracted by the sampling gun can be marked, and comparison can be performed after mercury content is detected by using a detection assembly, so that calibration of mercury content in flue gas can be realized.
5. The fixed-source flue gas heat-tracing direct-mercury-extraction online continuous monitoring system according to claim 4, further comprising a back-blowing air assembly, wherein the back-blowing air assembly comprises an air pump and a connecting pipe, a first end of the connecting pipe is connected with the air pump, and a second end of the connecting pipe is connected with the sampling gun and is located between the filter element and the port of the exhaust end; and/or the presence of a gas in the gas,
the sampling gun further comprises a heat insulation layer, and the heat insulation layer is arranged on the outer wall surface of the sampling gun.
6. The fixed-source flue gas heat tracing direct mercury pumping online continuous monitoring system according to claim 1, further comprising a first heating element and a second heating element, wherein the first heating element is used for heating the first reaction unit so that the temperature of the first reaction unit is greater than or equal to 400 ℃ and less than or equal to 800 ℃;
the second heating element is used for heating the second reaction unit so that the temperature of the second reaction unit is more than or equal to 120 ℃ and less than or equal to 200 ℃.
7. The fixed-source flue gas heat tracing straight mercury extraction online continuous monitoring system of claim 1, wherein the detection assembly comprises a mercury analyzer, a condenser, a flow detector and a vacuum pump which are connected in sequence,
the mercury analyzer is provided with a gas inlet which is used for being connected with the first reaction unit and the second reaction unit so as to be used for detecting the smoke discharged by the first reaction unit or the second reaction unit,
the condenser is used for drying the flue gas discharged by the mercury analyzer,
the flow detector is used for detecting the flow of the flue gas discharged by the condenser,
the vacuum pump is used for pumping out the smoke in the flow detector.
8. An on-line continuous monitoring method for fixed-source flue gas heat tracing direct mercury pumping, which is used for the on-line continuous monitoring system for fixed-source flue gas heat tracing direct mercury pumping according to any one of claims 1 to 7, and comprises the following steps:
s1, extracting smoke in a fixed source by using a sampling gun;
s2, introducing the extracted flue gas into a first reaction unit or a second reaction unit, wherein the flue gas in the first reaction unit can be converted from gaseous bivalent mercury into gaseous elemental mercury, and the flue gas in the second reaction unit can be used for removing the gaseous bivalent mercury;
s3, measuring the content of gaseous element mercury contained in the flue gas discharged by the first reaction unit or the second reaction unit by using a mercury analyzer;
s4, utilizing a condenser to dry the flue gas discharged after the measurement of the mercury analyzer;
s5, detecting the smoke exhausted by the condenser by using a flow measuring device;
s6, extracting the smoke detected by the flow measuring device by using a vacuum pump.
9. The fixed-source flue gas heat tracing direct mercury pumping online continuous monitoring method according to claim 8, comprising a first process and a second process, wherein the first process comprises steps S1-S6, and in step S2, flue gas pumped by the sampling gun enters the first reaction unit, the second process comprises steps S1-S6, and in step S2, flue gas pumped by the sampling gun enters the second reaction unit, and the time for introducing flue gas into the first reaction unit in the first process is the same as the time for introducing flue gas into the second reaction unit in the second process.
10. The fixed-source flue gas heat tracing direct mercury online continuous monitoring method according to claim 9, wherein the first reaction unit comprises a first deacidification unit, a second deacidification unit and a high-temperature reduction unit, and in S2 of the first process, the flue gas passes through the first deacidification unit or the second deacidification unit and then enters the high-temperature reduction unit to convert gaseous divalent mercury into gaseous elemental mercury.
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| CN202211549258.8A CN115932178A (en) | 2022-12-05 | 2022-12-05 | Fixed source flue gas heat tracing direct mercury pumping on-line continuous monitoring system and method |
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