CN203053773U - Monitoring system for total gaseous mercury in exhaust gas - Google Patents
Monitoring system for total gaseous mercury in exhaust gas Download PDFInfo
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- CN203053773U CN203053773U CN 201220756013 CN201220756013U CN203053773U CN 203053773 U CN203053773 U CN 203053773U CN 201220756013 CN201220756013 CN 201220756013 CN 201220756013 U CN201220756013 U CN 201220756013U CN 203053773 U CN203053773 U CN 203053773U
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- shrinkage hole
- expanded bore
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Abstract
The utility model provides a monitoring system for total gaseous mercury in exhaust gas. The monitoring system comprises a sampling unit, a conversion unit and a detection unit, wherein the conversion unit comprises a gas container, a heating component, a small hole, a body and a gas pipeline, wherein the gas container is provided with an inlet end and an outlet end; the heating component is arranged on the gas container; the small hole is formed in the inlet end of the gas container; the body is internally provided with a shrinkage hole and an expansion hole which are communicated with each other; the shrinkage hole is communicated with the outlet end; the expansion hole is communicated with the detection unit; an included angle between axles of the shrinkage hole and the expansion hole is an obtuse angle; and the outlet end of the gas pipeline is arranged in the shrinkage hole. The monitoring system for total gaseous mercury in the exhaust gas provided by the utility model has the advantages of high mercury conversion efficiency, low cost, accuracy in measurement, long maintenance period and the like.
Description
Technical field
The utility model relates to flue gas monitoring, particularly the monitoring system of gaseous state total mercury in the flue gas.
Background technology
Mercury is a kind of poisonous heavy metal, often is present in fossil fuel, the rubbish, and in the flue gas of discharging when thereupon appearing at burning or waste incineration, the mercury that is emitted in the atmosphere is very big to the murder by poisoning of humans and animals.Therefore, need the mercury content in the monitoring flue gas, and in time make control measures.
At present, atomic absorption spectroscopy method, atomic fluorescence spectrometry method are adopted in the monitoring of mercury usually, but all can only monitor element state mercury in the flue gas.Therefore, if the gaseous state total mercury in the monitoring flue gas must all be converted to ion state mercury wherein the mercury of element state before sample gas enters optical analysis cell.Pintsch process is a kind of common method that ion state mercury is converted to element state mercury, but because the heavily influence of combination after being changed, ion state mercury can not be converted to element state mercury usually fully.
In order to prevent the generation of heavily combination, can in the conversion stove, fill certain reductive agent or acid-acceptor usually, but adopt these method ubiquity maintenance periods short, when using one section after degradation problem under the conversion efficiency, be unfavorable for prolonged application at the scene.
For example: Nippon company adopts sulphite and phosphate as the agent component, realized chemical combination attitude mercury is converted into the basic demand of element mercury, but maintenance period has only 2 months.Then adopt Ca (OH) in the ionic mercury converter of Thermo company
2As acid-acceptor, remove the sour gas in the reacted gas, but be to use Ca (OH)
2The time can have two problems, first: Ca during high temperature (OH)
2Can divide and take off, thereby be unfavorable for long-term use; Second: after absorbing sour gas and its reaction, Ca (OH)
2Self can be in use slow consumption fall, cause its serviceable life limited.Thereby make the ionic mercury converter of this scheme of employing use 3-6 namely to need to change once in individual month.
Also have, can be by in thermal reactor, injecting H
2Method stop reoxidizing of atomic state mercury.Be injected into H2 and O2, Cl in the thermal reactor
2React, the hydrone of the generation HCl in simultaneously can also adsorbed gas when reacted gas during by condenser, can remove, and makes not contain water vapour and HCl gas in the gas that enters optical analysis cell.But the problem that this method exists is, the adding of hydrogen makes has newly-generated HCl in the gas, do not absorbed by water and by condensation remove HCL can cause element state mercury oxidized again.
At the problems referred to above, Tekran has designed the device that liquid cleans at the end of conversion stove, and cleaning liquid (as high purity water) is taken away sour gas under hot conditions, thereby prevents heavily combination.Adopt this sample gas disposal apparatus structure very complicated, simultaneously because cleaning fluid itself is exactly consumables, therefore need periodic maintenance; Adopt liquid suction acid also to need the influence of considering that gas-liquid separation efficient causes monitoring result in addition.
The utility model content
In order to solve the deficiency in the above-mentioned prior art scheme, the monitoring system of gaseous state total mercury in the flue gas that the utility model provides a kind of mercury conversion efficiency height, cost is low, measurement is accurate, maintenance period is long.
The purpose of this utility model is achieved through the following technical solutions:
The monitoring system of gaseous state total mercury in a kind of flue gas, described monitoring system comprises sampling unit, converting unit, detecting unit; Described converting unit comprises:
Gas container, described gas container has entrance point and endpiece;
Heater block, described heater block are arranged on the described gas container;
Aperture, described aperture is arranged on the entrance point of described gas container;
Body, described body interior are provided with shrinkage hole and the expanded bore of connection, and described shrinkage hole is communicated with described endpiece, and described expanded bore is communicated with described detecting unit; Angle between the axis of described shrinkage hole and expanded bore is the obtuse angle;
Gas pipeline, the endpiece of described gas pipeline is arranged in the described shrinkage hole.
According to above-mentioned monitoring system, preferably, be circle or oval perpendicular to the cross section of the central axis of described shrinkage hole and/or expanded bore.
According to above-mentioned monitoring system, preferably, described shrinkage hole and/or expanded bore are frustum.
According to above-mentioned monitoring system, preferably, the tapering of described shrinkage hole is 15～30 degree, and the tapering of described expanded bore is 7～15 degree.
According to above-mentioned monitoring system, preferably, the tapering of described shrinkage hole is 20～25 degree, and the tapering of described expanded bore is 9～13 degree.
Compared with prior art, the beneficial effect that the utlity model has is:
1, under the situation that does not adopt reductive agent or acid-acceptor, just can realize HgCl
2Efficient conversion to element mercury.
2, do not contain any consumables, cost is low, and maintenance period is long, can greatly satisfy on-the-spot unattended demand.
3, after the flue gas after the conversion entered in the body, temperature sharply descended, and has avoided the heavily combination of mercury, and conversion efficiency can not descend in time, thereby made that the monitoring result of gaseous state total mercury is effectively steady in a long-term, and measurement result is accurate.
Description of drawings
With reference to accompanying drawing, disclosure of the present utility model will be easier to understand.Those skilled in the art are understood that easily: these accompanying drawings only are used for illustrating the technical solution of the utility model, and are not to be intended to protection domain of the present utility model is construed as limiting.Among the figure:
Fig. 1 is the structure diagram according to the converting unit of the utility model embodiment 1;
Fig. 2 is the process flow diagram according to the switch process of the utility model embodiment 1.
Embodiment
Fig. 1,2 and following declarative description optional embodiment of the present utility model how to implement with instruction those skilled in the art and reproduce the utility model.In order to instruct technical solutions of the utility model, simplified or omitted some conventional aspects.Those skilled in the art should understand that the modification that is derived from these embodiments or replace will be in scope of the present utility model.Those skilled in the art should understand that following characteristics can make up to form a plurality of modification of the present utility model in every way.Thus, the utility model is not limited to following optional embodiment, and is only limited by claim and their equivalent.
Embodiment 1:
The described monitoring system of the monitoring system of gaseous state total mercury comprises in the flue gas of the utility model embodiment:
Sampling unit, filter element and detecting unit, these all are the state of the art, do not repeat them here;
Fig. 1 has schematically provided the structure diagram of the converting unit 31 of the utility model embodiment, and as shown in Figure 1, described converting unit comprises:
Gas pipeline, the endpiece 332 of described gas pipeline is arranged in the described shrinkage hole.
In order to improve the cooling-down effect that flows out flue gas to the suction effect of flue gas to be measured and in the container, preferably, the tapering of described shrinkage hole is 15～30 degree, and the tapering of described expanded bore is 7～15 degree.More preferably, the tapering of described shrinkage hole is 20～25 degree, and the tapering of described expanded bore is 9～13 degree.
The monitoring method of gaseous state total mercury in the flue gas of the utility model embodiment, described monitoring method comprise sampling procedure, switch process and detect step;
Fig. 2 has schematically provided the process flow diagram of switch process, and as shown in Figure 2, described switch process further may further comprise the steps:
(A1) gas enters in the intrinsic shrinkage hole, enters afterwards in the expanded bore to expand, and makes flue gas to be measured enter in the container by aperture; Preferably, flue gas to be measured enters in the container by described aperture with velocity of sound, so that convenient tolerance exactly enters the flue gas volume in the container.Preferably, be circle or oval perpendicular to the cross section of the central axis of described shrinkage hole and/or expanded bore, described shrinkage hole and/or expanded bore are frustum.
(A2) heater block heats the flue gas to be measured in the described container, makes that the ion state mercury in the flue gas is converted to element state mercury; Preferably, the temperature of the flue gas to be measured in the described container is the 700-900 degree.
(A3) flue gas to be measured in the described container enters described shrinkage hole, expanded bore, mix with described gas, and temperature drops to the 50-150 degree, thereby prevented the heavily combination of mercury, conversion efficiency can not descend in time, thereby makes that the monitoring result of gaseous state total mercury is effectively steady in a long-term, and measurement result is accurate
In order to improve the cooling-down effect that flows out flue gas to the suction effect of flue gas to be measured and in the container, preferably, the tapering of described shrinkage hole is 15～30 degree, and the tapering of described expanded bore is 7～15 degree.More preferably, the tapering of described shrinkage hole is 20～25 degree, and the tapering of described expanded bore is 9～13 degree.
Embodiment 2:
According to the monitoring system of the utility model embodiment 1 and the application examples of method.
In this application examples, carrier gas sharply expands after entering expanded bore at a high speed, thereby produces negative pressuren zone at the expanded bore place, thereby makes flue gas to be measured pass through aperture with velocity of sound.Flue gas to be measured enters in the quartz container, is heated to 900 degree by the electrical heating wire of quartz container periphery, and the ion state mercury in the flue gas all is converted to element state mercury.Flue gas after the conversion enters at a high speed in shrinkage hole and the expanded bore and mixes with carrier gas, and temperature drops sharply to about 100 degree, has prevented the heavily combination of mercury.Cross section perpendicular to the central axis of described shrinkage hole and expanded bore is round, and described shrinkage hole and expanded bore are frustum.Angle between the axis of described shrinkage hole and expanded bore is 98 degree; The tapering of shrinkage hole is 15 degree, and the tapering of expanded bore is 7 degree.
Embodiment 3:
According to the monitoring system of the utility model embodiment 1 and the application examples of method.
In this application examples, carrier gas sharply expands after entering expanded bore at a high speed, thereby produces negative pressuren zone at the expanded bore place, thereby makes flue gas to be measured pass through aperture with velocity of sound.Flue gas to be measured enters in the quartz container, is heated to 700 degree by the electrical heating wire of quartz container periphery, and the ion state mercury in the flue gas all is converted to element state mercury.Flue gas after the conversion enters at a high speed in shrinkage hole and the expanded bore and mixes with carrier gas, and temperature drops sharply to about 150 degree, has prevented the heavily combination of mercury.Cross section perpendicular to the central axis of described shrinkage hole and expanded bore is round, and described shrinkage hole and expanded bore are frustum.Angle between the axis of described shrinkage hole and expanded bore is 100 degree; The tapering of shrinkage hole is 30 degree, and the tapering of expanded bore is 15 degree.
Embodiment 4:
According to the monitoring system of the utility model embodiment 1 and the application examples of method.
In this application examples, carrier gas sharply expands after entering expanded bore at a high speed, thereby produces negative pressuren zone at the expanded bore place, thereby makes flue gas to be measured pass through aperture with velocity of sound.Flue gas to be measured enters in the quartz container, is heated to 800 degree by the electrical heating wire of quartz container periphery, and the ion state mercury in the flue gas all is converted to element state mercury.Flue gas after the conversion enters at a high speed in shrinkage hole and the expanded bore and mixes with carrier gas, and temperature drops sharply to about 50 degree, has prevented the heavily combination of mercury.Cross section perpendicular to the central axis of described shrinkage hole and expanded bore is round, and described shrinkage hole and expanded bore are frustum.Angle between the axis of described shrinkage hole and expanded bore is 120 degree; The tapering of shrinkage hole is 20 degree, and the tapering of expanded bore is 13 degree.
Embodiment 5:
According to the monitoring system of the utility model embodiment 1 and the application examples of method.
In this application examples, carrier gas sharply expands after entering expanded bore at a high speed, thereby produces negative pressuren zone at the expanded bore place, thereby makes flue gas to be measured pass through aperture with velocity of sound.Flue gas to be measured enters in the quartz container, is heated to 850 degree by the electrical heating wire of quartz container periphery, and the ion state mercury in the flue gas all is converted to element state mercury.Flue gas after the conversion enters at a high speed in shrinkage hole and the expanded bore and mixes with carrier gas, and temperature drops sharply to about 135 degree, has prevented the heavily combination of mercury.Cross section perpendicular to the central axis of described shrinkage hole and expanded bore is round, and described shrinkage hole and expanded bore are frustum.Angle between the axis of described shrinkage hole and expanded bore is 150 degree; The tapering of shrinkage hole is 25 degree, and the tapering of expanded bore is 9 degree.
Embodiment 6:
According to the monitoring system of the utility model embodiment 1 and the application examples of method.
In this application examples, carrier gas sharply expands after entering expanded bore at a high speed, thereby produces negative pressuren zone at the expanded bore place, thereby makes flue gas to be measured pass through aperture with velocity of sound.Flue gas to be measured enters in the quartz container, is heated to 770 degree by the electrical heating wire of quartz container periphery, and the ion state mercury in the flue gas all is converted to element state mercury.Flue gas after the conversion enters at a high speed in shrinkage hole and the expanded bore and mixes with carrier gas, and temperature drops sharply to about 95 degree, has prevented the heavily combination of mercury.Cross section perpendicular to the central axis of described shrinkage hole and expanded bore is round, and described shrinkage hole and expanded bore are frustum.Angle between the axis of described shrinkage hole and expanded bore is 160 degree; The tapering of shrinkage hole is 22 degree, and the tapering of expanded bore is 11 degree.
Embodiment 7:
According to the monitoring system of the utility model embodiment 1 and the application examples of method.
In this application examples, carrier gas sharply expands after entering expanded bore at a high speed, thereby produces negative pressuren zone at the expanded bore place, thereby makes flue gas to be measured pass through aperture with velocity of sound.Flue gas to be measured enters in the quartz container, is heated to 770 degree by the electrical heating wire of quartz container periphery, and the ion state mercury in the flue gas all is converted to element state mercury.Flue gas after the conversion enters at a high speed in shrinkage hole and the expanded bore and mixes with carrier gas, and temperature drops sharply to about 95 degree, has prevented the heavily combination of mercury.Angle between the axis of described shrinkage hole and expanded bore is 180 degree; Cross section perpendicular to the central axis of described shrinkage hole and expanded bore is oval.
Claims (5)
1. the monitoring system of gaseous state total mercury in the flue gas, described monitoring system comprises sampling unit, converting unit, detecting unit; It is characterized in that: described converting unit comprises:
Gas container, described gas container has entrance point and endpiece;
Heater block, described heater block are arranged on the described gas container;
Aperture, described aperture is arranged on the entrance point of described gas container;
Body, described body interior are provided with shrinkage hole and the expanded bore of connection, and described shrinkage hole is communicated with described endpiece, and described expanded bore is communicated with described detecting unit; Angle between the axis of described shrinkage hole and expanded bore is the obtuse angle;
Gas pipeline, the endpiece of described gas pipeline is arranged in the described shrinkage hole.
2. monitoring system according to claim 1 is characterized in that: the cross section perpendicular to the central axis of described shrinkage hole and/or expanded bore is circle or oval.
3. monitoring system according to claim 1, it is characterized in that: described shrinkage hole and/or expanded bore are frustum.
4. monitoring system according to claim 3 is characterized in that: the tapering of described shrinkage hole is 15～30 degree, and the tapering of described expanded bore is 7～15 degree.
5. monitoring system according to claim 4 is characterized in that: the tapering of described shrinkage hole is 20～25 degree, and the tapering of described expanded bore is 9～13 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220756013 CN203053773U (en) | 2012-12-29 | 2012-12-29 | Monitoring system for total gaseous mercury in exhaust gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220756013 CN203053773U (en) | 2012-12-29 | 2012-12-29 | Monitoring system for total gaseous mercury in exhaust gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203053773U true CN203053773U (en) | 2013-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220756013 Expired - Fee Related CN203053773U (en) | 2012-12-29 | 2012-12-29 | Monitoring system for total gaseous mercury in exhaust gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203053773U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103134718A (en) * | 2012-12-29 | 2013-06-05 | 聚光科技(杭州)股份有限公司 | Monitoring system and method of gas state total mercury in smoke |
-
2012
- 2012-12-29 CN CN 201220756013 patent/CN203053773U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103134718A (en) * | 2012-12-29 | 2013-06-05 | 聚光科技(杭州)股份有限公司 | Monitoring system and method of gas state total mercury in smoke |
| CN103134718B (en) * | 2012-12-29 | 2015-06-10 | 聚光科技(杭州)股份有限公司 | Monitoring system and method of gas state total mercury in smoke |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130710 Termination date: 20211229 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |