CN212391447U - Efficiency detection system for gas-phase divalent mercury catalytic reducing agent - Google Patents
Efficiency detection system for gas-phase divalent mercury catalytic reducing agent Download PDFInfo
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Abstract
The utility model provides an efficiency detection system for a gas-phase divalent mercury catalytic reducing agent, which comprises a divalent mercury generator, a divalent mercury pyrolyzer, a catalytic reduction reactor and a mercury detector; the inlet end of the divalent mercury generator is communicated with a gas source; the inlet end of the divalent mercury pyrolyzer and the inlet end of the catalytic reduction reactor are respectively communicated with the outlet end of the divalent mercury generator through an air inlet pipeline, and each air inlet pipeline is provided with an air inlet control valve; the outlet end of the bivalent mercury pyrolyzer and the outlet end of the catalytic reduction reactor are respectively communicated with the mercury measuring instrument through an exhaust pipeline, and each exhaust pipeline is provided with an exhaust control valve. The detection system has high stability and accuracy.
Description
Technical Field
The utility model belongs to the technical field of gaseous phase bivalent mercury catalytic reduction agent performance detection technique and specifically relates to a gaseous phase bivalent mercury catalytic reduction agent efficiency detecting system is related to.
Background
The mercury and the compounds thereof are toxic and harmful substances, the micro-dose mercury can cause great harm to the human health and the natural environment such as ecological water, soil and atmosphere and the like and is difficult to completely eliminate, and the mercury has the characteristics of inter-regional migration, in-vivo enrichment, food chain toxicity transfer, strong latency and the like and has attracted global wide attention. In addition to natural causes such as volcanic eruption, rock weathering and forest fire, artificial activities such as fossil fuel combustion, metal smelting, cement production and chlor-alkali industry have become important sources of mercury pollution in the atmosphere. Despite the low mercury content in coal, coal resources have taken a significant position in the world's energy system in view of the increasing global energy demand, and therefore the combustion utilization of coal has become one of the most major sources of atmospheric artificial mercury emissions.
Currently, many countries around the world have enacted laws and regulations and industry standards specifically directed to the mercury emission limits of coal-fired thermal power plants. Whether establishing mercury emission inventories or evaluating the efficiency of various mercury removal techniques, achieving accurate measurements of mercury morphology is undoubtedly an important prerequisite and basis.
The presence of mercury in combustion products is classified into three types: gaseous elemental mercury Hg0(g) Gaseous state of oxidation mercury Hg2+(g) And particulate adsorbed mercury Hg adsorbed on the solid productP. Because the current mercury concentration online analysis and detection technology is based on detecting elemental mercuryThe method, therefore, is such that the measurement of mercury in the oxidized state must first be carried out by converting it to elemental mercury. The wet chemical conversion method is to convert bivalent mercury into elemental mercury by using a liquid conversion unit, but the reaction reagent needs to be replaced regularly, the detection precision is easily interfered by manpower, and the operation is complex. The high-temperature thermal conversion method is used for decomposing and reducing bivalent mercury into elemental mercury under the condition that the flue gas is at a high temperature (above 800 ℃), the method has high requirements on instruments and equipment, additional heat needs to be provided, and the decomposed and reduced elemental mercury can be oxidized again in the process of reducing the temperature, so that the conversion efficiency and the measurement accuracy are reduced. The solid catalytic reduction method is to utilize a solid catalytic reducing agent to carry out catalytic reduction on bivalent mercury into elemental mercury within the temperature range of 200-400 ℃, is simple to operate, does not need external energy supply, has high conversion efficiency, and is an advanced catalytic reducing agent for oxidized mercury in a flue gas mercury form continuous detection device at present. Therefore, designing a device for detecting the conversion efficiency of oxidized mercury of the solid catalytic reducing agent is necessary for developing a high-efficiency catalytic reducing agent.
At present, a plurality of problems still exist in some gas-phase divalent mercury conversion efficiency detection methods. For example, in the selection of mercury sources, a divalent mercury reagent (such as a mercuric chloride reagent) is used for heating and diluting, but the divalent mercury with constant flow and constant concentration is difficult to guarantee, and the uncertainty and discontinuity of the divalent mercury cannot accurately evaluate the conversion efficiency of the catalytic reducing agent. The reaction conditions of the wet chemical calibration method are very complex, uncertainty exists in the conversion process and the chemical reaction, and the conversion efficiency is low.
SUMMERY OF THE UTILITY MODEL
The first purpose of the utility model is to provide an efficiency detection system for gas-phase bivalent mercury catalytic reducing agent, which can solve the problems of low stability and poor accuracy existing in the efficiency detection process of the existing bivalent mercury catalytic reducing agent;
the utility model provides an efficiency detection system for a gas-phase divalent mercury catalytic reducing agent, which comprises a divalent mercury generator, a divalent mercury pyrolyzer, a catalytic reduction reactor and a mercury detector;
the inlet end of the divalent mercury generator is communicated with a gas source;
the inlet end of the divalent mercury pyrolyzer and the inlet end of the catalytic reduction reactor are respectively communicated with the outlet end of the divalent mercury generator through an air inlet pipeline, and each air inlet pipeline is provided with an air inlet control valve;
the outlet end of the bivalent mercury pyrolyzer and the outlet end of the catalytic reduction reactor are respectively communicated with the mercury measuring instrument through an exhaust pipeline, and each exhaust pipeline is provided with an exhaust control valve.
Preferably, the inlet end of the divalent mercury generator is provided with a mass flow meter.
Preferably, the outlet end of the divalent mercury generator is provided with a first three-way valve;
the first valve port of the first three-way valve is communicated with the outlet end of the divalent mercury generator;
a second valve port of the first three-way valve is communicated with the inlet end of the divalent mercury pyrolyzer through a first air inlet pipeline, and a first air inlet control valve is arranged on the first air inlet pipeline;
and a third valve port of the first three-way valve is communicated with the inlet end of the catalytic reduction reactor through a second air inlet pipeline, and a second air inlet control valve is arranged on the second air inlet pipeline.
Preferably, the divalent mercury generator comprises a divalent mercury permeation tube, a heat-conducting medium quartz glass ball, a first electric heating element and a first temperature controller;
the first electric heating element is electrically connected with a first temperature controller and is provided with a heating cavity;
the heat-conducting medium quartz glass balls and the divalent mercury permeation tube are arranged in the heating cavity, and the heat-conducting medium quartz glass balls are distributed around the divalent mercury permeation tube;
the inlet end of the divalent mercury permeation tube is the inlet end of the divalent mercury generator.
Preferably, the divalent mercury pyrolyzer comprises a pyrolysis reaction tube, first quartz wool, a first constant-temperature medium quartz glass ball, an acid scavenger, a first thermocouple, a second electric heating element, a second temperature controller and a first heat-preservation shell;
the second temperature controller is electrically connected with a second electric heating element, the second electric heating element is arranged in the first heat-preservation shell, and the pyrolysis reaction tube is inserted in the second electric heating element;
along the flowing direction of the airflow, a first constant-temperature medium quartz glass ball and an acid scavenger are sequentially arranged in the pyrolysis reaction tube;
first quartz wool is arranged between the first constant-temperature medium quartz glass ball and the acid scavenger and outside the constant-temperature medium quartz glass ball and the acid scavenger;
the first thermocouple is electrically connected with the second temperature controller and is inserted into the first quartz wool on the outer side of the acid scavenger;
the inlet end of the pyrolysis reaction tube is the inlet end of a divalent mercury pyrolyzer, and the outlet end of the pyrolysis reaction tube is the outlet end of the divalent mercury pyrolyzer.
Preferably, the catalytic reductant reactor comprises: the device comprises a catalytic reduction reaction tube, second quartz wool, a second constant-temperature medium quartz glass ball, a second thermocouple, a third electric heating element, a third temperature control instrument and a second heat-preservation shell;
the third electric heating element is electrically connected with a third temperature controller, the third electric heating element is arranged in the second heat-insulating shell, and the catalytic reduction reaction tube is inserted in the third electric heating element;
the second constant-temperature medium quartz glass ball is arranged in the catalytic reduction reaction tube, and second quartz wool is arranged at two ends of the second constant-temperature medium quartz glass ball;
the second thermocouple is inserted on the second quartz wool close to the outlet end of the catalytic reduction reaction tube;
the inlet end of the catalytic reduction reaction tube is the inlet end of the catalytic reducing agent reactor, and the outlet end of the catalytic reduction reaction tube is the outlet end of the catalytic reducing agent reactor.
Preferably, the outlet ends of the divalent mercury pyrolyzer and the catalytic reduction reactor are provided with a second three-way valve;
a first valve port of the second three-way valve is communicated with the outlet end of the divalent mercury pyrolyzer through a first exhaust pipeline, and a first exhaust control valve is arranged on the first exhaust pipeline;
a second valve port of the second three-way valve is communicated with the outlet end of the catalytic reduction reactor through a second exhaust pipeline, and a second exhaust control valve is arranged on the second exhaust pipeline;
and a third valve port of the second three-way valve is communicated with the mercury detector.
Preferably, a gas cooler is arranged on a communication pipeline between the third valve port of the second three-way valve and the mercury vapor detector.
Preferably, the outlet end of the mercury detector is communicated with an activated carbon purifier.
A method for detecting the efficiency of a gas-phase divalent mercury catalytic reducing agent by adopting the system for detecting the efficiency of the gas-phase divalent mercury catalytic reducing agent comprises the following steps:
generating a bivalent mercury standard gas flow with constant concentration, continuous flow and stability by a bivalent mercury generator;
introducing bivalent mercury standard gas into a bivalent mercury pyrolyzer, observing a mercury value measured by a mercury detector after the temperature of the bivalent mercury pyrolyzer reaches a set temperature, regarding the system as stable after the mercury value is completely stable, and recording the calibrated initial mercury concentration;
and stopping conveying the bivalent mercury standard gas into the bivalent mercury pyrolyzer, introducing the bivalent mercury standard gas into the catalytic reducing agent reactor, observing the converted mercury concentration, recording the mercury value after the mercury value is stable, and comparing the mercury value in the step with the initial mercury concentration to obtain the conversion efficiency of the catalytic reducing agent.
Has the advantages that:
the method comprises the steps of generating bivalent mercury standard gas through a bivalent mercury generator, controlling the bivalent mercury standard gas to enter a bivalent mercury pyrolyzer and a catalytic reduction reactor through an air inlet control valve and an air exhaust control valve respectively, completely cracking all valence-state mercury in the bivalent mercury pyrolyzer at high temperature, carrying out reduction reaction on bivalent mercury in the catalytic reduction reactor, and finally detecting the mercury concentration of gas discharged by the bivalent mercury pyrolyzer and the catalytic reduction reactor to obtain the catalytic reaction efficiency of a catalyst. The detection system has high stability and accuracy.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an efficiency detection system for a gas-phase divalent mercury catalytic reducing agent according to an embodiment of the present invention.
Description of reference numerals:
1: a mass flow meter; 2: a divalent mercury generator; 3: a divalent mercury pyrolyzer; 4: a catalytic reduction reactor; 5: a gas cooler; 6: a mercury meter; 7: an activated carbon purifier; 8: a first intake control valve; 9: a second intake control valve; 10: a first exhaust control valve; 11: a second exhaust control valve; 12: first three-way valve, 13: a second three-way valve;
21: a divalent mercury permeation tube; 22: a heat-conducting medium quartz glass ball; 23: a first heating element; 24: a first temperature controller;
31: a pyrolysis reaction tube; 32: first quartz wool; 33: a first constant temperature medium quartz glass ball; 34: an acid scavenger; 35: a first thermocouple; 36: a second electrical heating element; 37: a second temperature controller; 38: a first heat-insulating housing;
41: a catalytic reduction reaction tube; 42: second quartz wool; 43: a second constant temperature medium quartz glass ball; 44: a second thermocouple; 45: a third electric heating element; 46: a third temperature control instrument; 47: and a second heat-insulating shell.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present 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, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, in the present embodiment, an efficiency detection system for a gas-phase divalent mercury catalytic reducing agent is provided, which includes a divalent mercury generator 2, a divalent mercury pyrolyzer 3, a catalytic reduction reactor 4, and a mercury detector 6.
The inlet end of the divalent mercury generator 2 is communicated with a gas source, the inlet end of the divalent mercury pyrolyzer 3 and the inlet end of the catalytic reduction reactor 4 are respectively communicated with the outlet end of the divalent mercury generator 2 through an air inlet pipeline, and each air inlet pipeline is provided with an air inlet control valve.
The outlet end of the bivalent mercury pyrolyzer 2 and the outlet end of the catalytic reduction reactor 4 are respectively communicated with a mercury measuring instrument 6 through an exhaust pipeline, and each exhaust pipeline is provided with an exhaust control valve.
In the embodiment, the bivalent mercury standard gas is generated by the bivalent mercury generator 2, and is controlled by the air inlet control valve and the air exhaust control valve to respectively enter the bivalent mercury pyrolyzer 2 and the catalytic reduction reactor 4, mercury in all valence states is completely cracked at high temperature in the bivalent mercury pyrolyzer 2, bivalent mercury is subjected to reduction reaction in the catalytic reduction reactor 4, and finally the catalytic reaction efficiency of the catalyst is obtained by detecting the mercury concentration of the gas exhausted by the bivalent mercury pyrolyzer 2 and the catalytic reduction reactor 4. The detection system has high stability and accuracy.
The inlet end of the divalent mercury generator 2 is provided with a mass flow meter 1. The amount of mercury-containing carrier gas entering the divalent mercury generator 2 can be controlled by the arrangement of the mass flow meter 1.
Specifically, the outlet end of the divalent mercury generator 2 is provided with a first three-way valve 12, and a first valve port of the first three-way valve 12 is communicated with the outlet end of the divalent mercury generator 2.
The second valve port of the first three-way valve 12 is communicated with the inlet end of the divalent mercury pyrolyzer 3 through a first air inlet pipeline, and a first air inlet control valve 8 is arranged on the first air inlet pipeline.
The third valve port of the first three-way valve 12 is communicated with the inlet end of the catalytic reduction reactor 4 through a second air inlet pipeline, and a second air inlet control valve 9 is arranged on the second air inlet pipeline.
The divalent mercury generator 2 comprises a divalent mercury permeation tube 21, a heat-conducting medium quartz glass ball 22, a first electric heating element 23 and a first temperature controller 24.
The first electric heating element 23 is electrically connected to the first temperature controller 24, and the first electric heating element 23 has a heating cavity.
The heat-conducting medium quartz glass balls 22 and the divalent mercury permeation tube 21 are arranged in the heating cavity, and the heat-conducting medium quartz glass balls 22 are distributed around the divalent mercury permeation tube 21.
The inlet end 21 of the divalent mercury permeating tube is the inlet end of the divalent mercury generator 21.
The divalent mercury permeation tube 21 is used as a divalent mercury source, so that continuous and stable divalent mercury can be provided, and the requirement of evaluating the conversion effect of the catalytic reducing agent for a long time can be met.
Through the accurate control zone of heating temperature of first temperature controller 24, and the quartz glass ball of packing between bivalent mercury infiltration pipe 21 and the first heating element 23 can make the mercury infiltration pipe be heated evenly to guarantee that bivalent mercury releases steadily, reduce experimental error.
The divalent mercury pyrolyzer 3 comprises a pyrolysis reaction tube 31, first quartz wool 32, a first constant temperature medium quartz glass ball 33, an acid scavenger 34, a first thermocouple 35, a second electric heating element 36, a second temperature controller 37 and a first heat preservation shell 38.
The second temperature controller 37 is electrically connected to the second electric heating element 36, the second electric heating element 36 is disposed in the first heat-insulating housing 38, and the pyrolysis reaction tube 31 is inserted into the second electric heating element 36.
Along the flowing direction of the gas flow, a first constant temperature medium quartz glass ball 33 and an acid scavenger 34 are sequentially arranged in the pyrolysis reaction tube 31.
First quartz wool 32 is arranged between the first constant temperature medium quartz glass ball 33 and the acid scavenger 34 and outside the first constant temperature medium quartz glass ball 33 and the acid scavenger 34.
The first thermocouple 35 is electrically connected with the second temperature controller 37, and the first thermocouple 35 is inserted in the first quartz wool outside the acid scavenger 34.
The inlet end of the pyrolysis reaction tube 31 is the inlet end of the divalent mercury pyrolyzer 3, and the outlet end of the pyrolysis reaction tube 31 is the outlet end of the divalent mercury pyrolyzer 3.
The quartz glass balls filled in the high-temperature cracking section can better ensure the complete cracking of the divalent mercury, and the filled acid removing agent can absorb the acid gas generated by cracking, so that the secondary compounding of the acid gas and the elemental mercury is prevented, and the calibration result is prevented from being influenced.
Catalytic reductant reactor 4
The catalytic reductant reactor 4 includes: a catalytic reduction reaction tube 41, second quartz wool 42, a second constant temperature medium quartz glass ball 43, a second thermocouple 44, a third electric heating element 45, a third temperature controller 46 and a second heat-insulating shell 47.
The third electric heating element 45 is electrically connected with the third temperature controller 46, the third electric heating element 45 is arranged in the second heat-insulating shell 47, and the catalytic reduction reaction tube 41 is inserted in the third electric heating element 45.
The second constant temperature medium quartz glass ball 43 is arranged in the catalytic reduction reaction tube 41, and the second quartz wool 42 is arranged at both ends of the second constant temperature medium quartz glass ball 43.
The second thermocouple 44 is inserted on the second quartz wool 42 near the outlet end of the catalytic reduction reaction tube 41.
The inlet end of the catalytic reduction reaction tube 41 is the inlet end of the catalytic reduction reactor 4, and the outlet end of the catalytic reduction reaction tube 41 is the outlet end of the catalytic reduction reactor 4.
The inserted temperature thermocouples are arranged in the quartz wool of the pyrolysis section and the catalytic reduction reaction section, so that the reaction temperature can be monitored in real time, the divalent mercury can be completely decomposed, the reaction process of the catalytic reducing agent can be monitored, and a reasonable result can be obtained.
The outlet ends of the bivalent mercury pyrolyzer 3 and the catalytic reduction reactor 4 are provided with a second three-way valve 13.
The first valve port of the second three-way valve 13 is communicated with the outlet end of the divalent mercury pyrolyzer 3 through a first exhaust pipeline, and a first exhaust control valve 10 is arranged on the first exhaust pipeline.
A second valve port of the second three-way valve 13 is communicated with the outlet end of the catalytic reduction reactor 4 through a second exhaust pipe on which a second exhaust control valve 11 is provided.
The third valve port of the second three-way valve 13 is communicated with the mercury detector 6.
And a gas cooler 5 is arranged on a communication pipeline between the third valve port of the second three-way valve 13 and the mercury vapor detector 6. The gas cooler 5 ensures that the mercury analyzer operates in a reasonable temperature interval.
The outlet end of the mercury detector 6 is communicated with an active carbon purifier 7. The activated carbon purifier 7 recovers the tail gas.
The gas circuit pipes used in the embodiment all adopt stainless steel pipes with polytetrafluoroethylene material coatings inside, the connecting pieces and the valves adopt polytetrafluoroethylene pieces, the divalent mercury pyrolysis reaction pipe and the catalytic reduction reaction pipe adopt quartz glass materials, and the adsorption influence of the system on mercury is eliminated to the greatest extent.
In this embodiment, a method for detecting efficiency of a gas-phase divalent mercury catalytic reducing agent is further provided, where the method for detecting efficiency of a gas-phase divalent mercury catalytic reducing agent is performed by using the system for detecting efficiency of a gas-phase divalent mercury catalytic reducing agent as described above, and includes the following steps:
the bivalent mercury generator 2 generates the bivalent mercury standard gas flow with constant concentration, continuous flow and stability.
And (3) introducing the bivalent mercury standard gas into the bivalent mercury pyrolyzer 3, observing the mercury value measured by the mercury detector after the temperature of the bivalent mercury pyrolyzer 3 reaches the set temperature, and recording the calibrated initial mercury concentration after the mercury value is completely stabilized.
And stopping conveying the bivalent mercury standard gas into the bivalent mercury pyrolyzer 3, introducing the bivalent mercury standard gas into the catalytic reducing agent reactor 4, observing the converted mercury concentration, recording the mercury value after the mercury value is stable, and comparing the mercury value in the step with the initial mercury concentration to obtain the conversion efficiency of the catalytic reducing agent.
In order to further explain the method, the embodiment also provides a specific embodiment of the method.
When the device is used, the first heating element 23 is adjusted to the temperature T ℃ through the first temperature control instrument 24, carrier gas is controlled through the mass flow meter 1 and is introduced into the divalent mercury generator 2, and the heat-conducting medium quartz glass balls 22 filled in the divalent mercury generator 2 enable the temperature in the mercury generator to be kept uniform, so that the divalent mercury permeation tube 21 is uniformly heated, and the divalent mercury is ensured to be continuously and stably generated and input into the system.
Opening a valve (a first air inlet control valve 8) of the pyrolysis section, setting the temperature of a second electric heating element 36 through a second temperature control instrument 37, enabling the temperature of the second electric heating element to be 800 ℃ (800 ℃, all valence-state mercury can be subjected to high-temperature pyrolysis), observing the mercury value measured by a mercury measuring instrument 6 after the furnace temperature reaches the set temperature, regarding the system as stable after the mercury value is completely stable, wherein the mercury value at the moment is the concentration of bivalent mercury released by a bivalent mercury permeation tube at the temperature T ℃, calibrating the initial mercury concentration according to the concentration, and recording the value as A;
after the catalytic reduction reaction section 4 is filled and installed, the valve of the pyrolysis section is closed, the valve of the catalytic reduction reaction section (a second air inlet control valve 9) is opened, the gas carrying the bivalent mercury with the calibrated concentration is led into the catalytic reduction agent reaction section 4, the concentration of the converted mercury is observed, and the mercury value B at the moment is recorded after the mercury value is stable. And comparing the mercury value B with the mercury value A to obtain the conversion efficiency of the catalytic reducing agent.
It should be noted that after the gas comes out from the bivalent mercury pyrolysis section or the catalytic reduction reaction section, the gas is cooled to a temperature below 100 ℃ through the gas cooling section 5, enters the mercury detection instrument 6, and is finally discharged after being absorbed by the activated carbon absorption section 7.
After the detection system provided by the present embodiment is used for each measurement, the pyrolysis reaction tube 31, the first constant temperature medium quartz glass spheres 33 and the acid scavenger 34 filled in the pyrolysis reaction tube 31 need to be replaced, and the adsorbent in the activated carbon purifier 7 needs to be periodically updated.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (9)
1. The efficiency detection system for the gas-phase divalent mercury catalytic reducing agent is characterized by comprising a divalent mercury generator, a divalent mercury pyrolyzer, a catalytic reduction reactor and a mercury meter;
the inlet end of the divalent mercury generator is communicated with a gas source;
the inlet end of the divalent mercury pyrolyzer and the inlet end of the catalytic reduction reactor are respectively communicated with the outlet end of the divalent mercury generator through an air inlet pipeline, and each air inlet pipeline is provided with an air inlet control valve;
the outlet end of the bivalent mercury pyrolyzer and the outlet end of the catalytic reduction reactor are respectively communicated with the mercury measuring instrument through an exhaust pipeline, and each exhaust pipeline is provided with an exhaust control valve.
2. The system for detecting efficiency of gas-phase divalent mercury catalytic reducing agent according to claim 1, wherein the inlet end of the divalent mercury generator is provided with a mass flow meter.
3. The gas-phase divalent mercury catalytic reduction agent efficiency detection system according to claim 1, characterized in that an outlet end of the divalent mercury generator is provided with a first three-way valve;
the first valve port of the first three-way valve is communicated with the outlet end of the divalent mercury generator;
a second valve port of the first three-way valve is communicated with the inlet end of the divalent mercury pyrolyzer through a first air inlet pipeline, and a first air inlet control valve is arranged on the first air inlet pipeline;
and a third valve port of the first three-way valve is communicated with the inlet end of the catalytic reduction reactor through a second air inlet pipeline, and a second air inlet control valve is arranged on the second air inlet pipeline.
4. The efficiency detection system for the gas-phase divalent mercury catalytic reducing agent according to claim 1, wherein the divalent mercury generator comprises a divalent mercury permeation tube, a heat-conducting medium quartz glass ball, a first electric heating element and a first temperature controller;
the first electric heating element is electrically connected with a first temperature controller and is provided with a heating cavity;
the heat-conducting medium quartz glass balls and the divalent mercury permeation tube are arranged in the heating cavity, and the heat-conducting medium quartz glass balls are distributed around the divalent mercury permeation tube;
the inlet end of the divalent mercury permeation tube is the inlet end of the divalent mercury generator.
5. The efficiency detection system for the gas-phase divalent mercury catalytic reducing agent according to claim 1, wherein the divalent mercury pyrolyzer comprises a pyrolysis reaction tube, first quartz wool, a first constant-temperature medium quartz glass ball, an acid scavenger, a first thermocouple, a second electric heating element, a second temperature controller and a first heat-preservation shell;
the second temperature controller is electrically connected with a second electric heating element, the second electric heating element is arranged in the first heat-preservation shell, and the pyrolysis reaction tube is inserted in the second electric heating element;
along the flowing direction of the airflow, a first constant-temperature medium quartz glass ball and an acid scavenger are sequentially arranged in the pyrolysis reaction tube;
first quartz wool is arranged between the first constant-temperature medium quartz glass ball and the acid scavenger and outside the constant-temperature medium quartz glass ball and the acid scavenger;
the first thermocouple is electrically connected with the second temperature controller and is inserted into the first quartz wool on the outer side of the acid scavenger;
the inlet end of the pyrolysis reaction tube is the inlet end of a divalent mercury pyrolyzer, and the outlet end of the pyrolysis reaction tube is the outlet end of the divalent mercury pyrolyzer.
6. The gas-phase divalent mercury catalytic reductant efficiency detection system of claim 1, wherein the catalytic reductant reactor comprises: the device comprises a catalytic reduction reaction tube, second quartz wool, a second constant-temperature medium quartz glass ball, a second thermocouple, a third electric heating element, a third temperature control instrument and a second heat-preservation shell;
the third electric heating element is electrically connected with a third temperature controller, the third electric heating element is arranged in the second heat-insulating shell, and the catalytic reduction reaction tube is inserted in the third electric heating element;
the second constant-temperature medium quartz glass ball is arranged in the catalytic reduction reaction tube, and second quartz wool is arranged at two ends of the second constant-temperature medium quartz glass ball;
the second thermocouple is inserted on the second quartz wool close to the outlet end of the catalytic reduction reaction tube;
the inlet end of the catalytic reduction reaction tube is the inlet end of the catalytic reducing agent reactor, and the outlet end of the catalytic reduction reaction tube is the outlet end of the catalytic reducing agent reactor.
7. The efficiency detection system for the gas-phase divalent mercury catalytic reducing agent according to claim 1, wherein outlet ends of the divalent mercury pyrolyzer and the catalytic reduction reactor are provided with a second three-way valve;
a first valve port of the second three-way valve is communicated with the outlet end of the divalent mercury pyrolyzer through a first exhaust pipeline, and a first exhaust control valve is arranged on the first exhaust pipeline;
a second valve port of the second three-way valve is communicated with the outlet end of the catalytic reduction reactor through a second exhaust pipeline, and a second exhaust control valve is arranged on the second exhaust pipeline;
and a third valve port of the second three-way valve is communicated with the mercury detector.
8. The system for detecting efficiency of a gas-phase divalent mercury catalytic reducing agent according to claim 7, wherein a gas cooler is arranged on a communication pipeline between the third valve port of the second three-way valve and the mercury detector.
9. The system for detecting efficiency of a gas-phase divalent mercury catalytic reducing agent according to claim 7, wherein an outlet end of the mercury vapor detector is communicated with an activated carbon purifier.
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