CN212646621U - Monitoring system for controlling emission of NH3 pollutants - Google Patents
Monitoring system for controlling emission of NH3 pollutants Download PDFInfo
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- CN212646621U CN212646621U CN202021039808.8U CN202021039808U CN212646621U CN 212646621 U CN212646621 U CN 212646621U CN 202021039808 U CN202021039808 U CN 202021039808U CN 212646621 U CN212646621 U CN 212646621U
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Abstract
The utility model discloses a control NH3 pollutant discharge's monitored control system, including pipe-line system, one end of pipe-line system is the flue gas inlet, and the other end is the exhanst gas outlet, in the pipe-line system, be equipped with flow path switching mechanism, high temperature catalysis mechanism and gas analysis appearance from the flue gas inlet to the exhanst gas outlet, still be equipped with in the pipe-line system and be used for driving the flue gas flows in the pipe-line system driving piece; after entering a pipeline system from a flue gas inlet, the flue gas generates nitric oxide through a high-temperature catalytic mechanism, and the nitric oxide is analyzed through the gas analyzer; and a flow path branch is connected between the flow path switching mechanisms, and after the flow path switching mechanism is opened, the flue gas enters the gas analyzer through the flow path switching mechanism and the flow path branch. The utility model discloses can effectually monitor NH3, prevent that the NH3 that drops into is excessive to the effectual secondary pollution phenomenon of avoiding causing by NH3 in desulfurization process.
Description
Technical Field
The utility model relates to a fixed pollution sources on-line monitoring system, in particular to monitored control system that control NH3 pollutant discharged.
Background
Studies have shown that NH3 is present in fine particulate matter (PM2.5) and mist in the atmosphereThe haze formation process plays an important role: during the haze development period, (NH4)2SO4And NH4NO3Is a significant increase in the number of particles, these secondary aerosols are an important constituent of PM2.5, and ammonia (NH)3) Plays an important role in the formation of nitrate and sulfate aerosol.
In the field of on-line monitoring of fixed pollution sources, NOx and SO in flue gas are used for controlling pollution caused by coal combustion2Before being discharged, denitration and desulfurization treatment are usually required, and among denitration technologies of coal-fired power plants and the like, a Selective Catalytic Reduction (SCR) technology is the most widely and mature flue gas denitration technology at present. The technology generally utilizes the catalytic reaction of NH3 and nitrogen oxides under the high-temperature and high-pressure catalytic environment, and NH3The denitration efficiency is different due to different mol ratios of/NOx, and in order to reach the denitration standard in some plants, NH3 is excessively added, so that the emission of NH3 is increased, and secondary pollution is formed.
From SO2According to control technology analysis, under the condition that the new standard desulfurization limit value is greatly improved, a thermal power plant can only install a high-efficiency flue gas desulfurization device with the desulfurization efficiency of more than or equal to 95%, the domestic process which can achieve the desulfurization efficiency of more than or equal to 95% has strong economy and wide application range and is technically mature only comprises limestone-gypsum wet flue gas desulfurization and ammonia wet flue gas desulfurization processes, wherein the ammonia desulfurization accounts for a large proportion. In the ammonia desulphurization process, ammonia is a very volatile substance, and is in a gas state at normal temperature and normal pressure, and the main reason for the ammonia escape is high free ammonia content in the desulphurization circulating liquid. In addition, when gaseous ammonia and water coexist, the gaseous ammonia and the water easily react with sulfur dioxide and sulfur trioxide in the flue gas to generate solid particles of ammonium sulfate and ammonium sulfite, namely aerosol particles, which are not easy to remove.
Therefore, the emission of ammonia is a problem which has been neglected for a long time in the haze control link, and attention and effective control are needed in emergency.
SUMMERY OF THE UTILITY MODEL
In order to solve the deficiencies in the prior art, the utility model aims to provide a control NH3 pollutant discharge's monitored control system, this system can effectually monitor NH3, and the NH3 that prevents to drop into is excessive to the effectual secondary pollution phenomenon of avoiding causing by NH3 in desulfurization process.
The utility model provides a technical scheme that its technical problem adopted does: a monitoring system for controlling emission of NH3 pollutants comprises a pipeline system, wherein one end of the pipeline system is a flue gas inlet, the other end of the pipeline system is a flue gas outlet, a flow path switching mechanism, a high-temperature catalytic mechanism and a gas analyzer are arranged between the flue gas inlet and the flue gas outlet in the pipeline system, and a driving piece for driving the flue gas to flow in the pipeline system is further arranged in the pipeline system;
after entering a pipeline system from a flue gas inlet, the flue gas generates nitric oxide through a high-temperature catalytic mechanism, and the nitric oxide is analyzed through the gas analyzer;
a flow path branch is connected between the flow path switching mechanisms, and after the flow path switching mechanism is opened, the flue gas enters the gas analyzer through the flow path switching mechanism and the flow path branch;
the gas analyzer is an NO analyzer.
Optionally, the flow path switching mechanism includes a first two-position three-way valve and a second two-position three-way valve, the first two-position three-way valve is arranged on a preceding-stage pipeline of the high-temperature catalytic mechanism, and the second two-position three-way valve is arranged on a subsequent-stage pipeline of the high-temperature catalytic mechanism;
the high-temperature catalytic mechanism is connected with the inlet of the first two-position three-way valve, the outlet of the high-temperature catalytic mechanism is connected with the inlet of the second two-position three-way valve, and the outlet of the first two-position three-way valve is communicated with the inlet of the second two-position three-way valve.
Optionally, a cooling device is connected between the high-temperature catalytic mechanism and the second two-position three-way valve, and a temperature sensor is further connected between the cooling device and the second two-position three-way valve.
Optionally, the high-temperature catalysis mechanism comprises a heating cavity, a heating mechanism is installed in the heating cavity, one end of the heating cavity is communicated with a first two-position three-way valve, the other end of the heating cavity is communicated with a second two-position three-way valve, and a catalyst is filled in the heating cavity.
Optionally, the heating mechanism is a heating wire or an electric heating rod, and a heat preservation heat insulation cover is installed outside the heating cavity.
Optionally, the driving member is a vacuum diaphragm pump or a jet pump, and the driving member is arranged in a pipeline system between the second two-position three-way valve and the gas analyzer.
Optionally, the cooling device is a circulating water chiller.
Adopt above-mentioned technical scheme, compared with the prior art, the utility model, following beneficial effect has:
1. in the utility model, the high temperature catalytic device can not affect the components and the content of the pollutants to be measured (such as SO2 and other components) in the flue gas, and can not interfere the monitoring of the pollutants to be measured;
2. the utility model has simple structure, easy operation and low cost;
3. the utility model discloses discharge to control pollutant NH3 has good effect, can effectually monitor NH3, and the NH3 that prevents to drop into is excessive to the effectual secondary pollution phenomenon of avoiding causing by NH3 in desulfurization process.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, the utility model discloses a control NH3 pollutant discharge's monitored control system, including pipe-line system, pipe-line system's one end is the exhanst gas inlet, and the other end is the exhanst gas outlet, in pipe-line system, is equipped with flow path switching mechanism, high temperature catalytic mechanism 1 and gas analysis appearance 2 from the exhanst gas inlet to between the exhanst gas outlet, still is equipped with the driving piece 3 that is used for driving the flue gas to flow in pipe-line system among the pipe-line system. During desulfurization, flue gas enters the pipeline system from the flue gas inlet and then passes through the high-temperature catalytic mechanism to generate nitric oxide, and the nitric oxide is analyzed by the gas analyzer. The nitrogen oxides generated during the desulfurization process are mainly NO, and therefore, the NO analyzer can be used for the gas analyzer 2.
High temperature catalysis mechanism 1 constructs to be desulfurated key part the utility model discloses in, high temperature catalysis mechanism 1 adopts current high temperature catalysis mechanism, and it is including heating the cavity, installs heating mechanism in the heating cavity, and heating cavity intussuseption is filled with metal platinum catalyst, and heating mechanism is heater strip or electric heat bar, makes the temperature that heats intracavity portion reach 900 ℃ to there is the heat preservation heat exchanger at the externally mounted in heating chamber. Other parts of the high-temperature catalytic mechanism 1 of the desulfurization process are not described in detail in the present invention.
The utility model discloses in, connect flow path branch 4 between the flow path switching mechanism, the back is opened at the flow path switching mechanism to the pipe-line system, and the flue gas directly gets into gas analyzer 2 through flow path switching mechanism and flow path branch 4.
Specifically, the flow path switching mechanism includes a first two-position three-way valve 5 and a second two-position three-way valve 6, the first two-position three-way valve 5 is disposed on the front-stage pipeline of the high-temperature catalytic mechanism 1, and the second two-position three-way valve 6 is disposed on the rear-stage pipeline of the high-temperature catalytic mechanism 1. Wherein, first two three-way valve 5 has two way exports, and second two three-way valve 6 has two way entrances, and the inlet end of heating cavity and one of them exit linkage of first two three-way valve 5, the end of giving vent to anger of heating cavity and one of them entry linkage of second two three-way valve 6, another exit of first two three-way valve 5 and another entry linkage of second two three-way valve 6.
The utility model discloses in, still be connected with heat sink 7 between high temperature catalytic mechanism 1 and the two three-way valves 6 of second, still be connected with temperature sensor 8 between heat sink 7 and the two three-way valves 6 of second, wherein, heat sink 7 can adopt circulation cold water machine.
The utility model discloses in, driving piece 3 is vacuum diaphragm pump or jet pump, and in driving piece 3 located the pipe-line system between two three-way valves of second 6 and the gas analysis appearance 2, driving piece 3 was used for the flue gas to flow in the pipe-line system and provides power.
The utility model discloses when using, at first, open flow path switching mechanism, the flue gas is whole to flow through flow path branch 4 this moment, then detects NO content M1 that contains in the flue gas of not desulfurization reaction through gas analyzer 2. And secondly, closing the flow path switching mechanism to enable the flue gas to completely flow through the high-temperature catalytic mechanism 1 to carry out desulfurization reaction, and then detecting the NO content M2 in the flue gas subjected to the desulfurization reaction by the gas analyzer 2. Finally, the difference between M2 and M1 is calculated. The difference between M2 and M1 represents the volume ratio of NH3, and the larger the difference, the higher the volume ratio of NH 3. If the volume ratio of NH3 exceeds the set threshold, the input amount of NH3 needs to be reduced, and then M2 is detected again until the volume ratio of NH3 is within the threshold.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be understood by those skilled in the art that the scope of the present invention is not limited to the specific combination of the above-mentioned features, but also covers other embodiments formed by any combination of the above-mentioned features or their equivalents without departing from the spirit of the present invention. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Besides the technical features described in the specification, other technical features are known to those skilled in the art, and further description of the other technical features is omitted here in order to highlight the innovative features of the present invention.
Claims (7)
1. A monitoring system for controlling emission of NH3 pollutants is characterized by comprising a pipeline system, wherein one end of the pipeline system is a flue gas inlet, the other end of the pipeline system is a flue gas outlet, a flow path switching mechanism, a high-temperature catalytic mechanism and a gas analyzer are arranged between the flue gas inlet and the flue gas outlet in the pipeline system, and a driving piece for driving the flue gas to flow in the pipeline system is further arranged in the pipeline system;
after entering a pipeline system from a flue gas inlet, the flue gas generates nitric oxide through a high-temperature catalytic mechanism, and the nitric oxide is analyzed through the gas analyzer;
a flow path branch is connected between the flow path switching mechanisms, and after the flow path switching mechanism is opened, the flue gas enters the gas analyzer through the flow path switching mechanism and the flow path branch;
the gas analyzer is an NO analyzer.
2. A monitoring system for controlling NH3 pollutant emissions according to claim 1, wherein the flow path switching mechanism comprises a first two-position three-way valve and a second two-position three-way valve, the first two-position three-way valve being located in a foreline of the high temperature catalytic mechanism, the second two-position three-way valve being located in a postline of the high temperature catalytic mechanism;
the high-temperature catalytic mechanism is connected with the inlet of the first two-position three-way valve, the outlet of the high-temperature catalytic mechanism is connected with the inlet of the second two-position three-way valve, and the outlet of the first two-position three-way valve is communicated with the inlet of the second two-position three-way valve.
3. The monitoring system for controlling emission of NH3 pollutants according to claim 2, wherein a temperature reduction device is connected between the high temperature catalytic mechanism and the second two-position three-way valve, and a temperature sensor is also connected between the temperature reduction device and the second two-position three-way valve.
4. The monitoring system for controlling emission of NH3 according to claim 3, wherein the high temperature catalysis mechanism comprises a heating cavity, a heating mechanism is installed in the heating cavity, one end of the heating cavity is communicated with a first two-position three-way valve, the other end of the heating cavity is communicated with a second two-position three-way valve, and a catalyst is filled in the heating cavity.
5. The monitoring system for controlling emission of NH3 pollutants according to claim 4, wherein the heating mechanism is a heating wire or an electric heating rod, and a heat insulating shield is installed outside the heating chamber.
6. A monitoring system for controlling NH3 pollutant emissions according to claim 5, wherein the driving member is a vacuum diaphragm pump or a jet pump, the driving member being provided in the piping system between the second two-position three-way valve and the gas analyzer.
7. The monitoring system for controlling pollutant emissions of NH3 according to claim 6, wherein the temperature reduction device is a recirculating chiller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021039808.8U CN212646621U (en) | 2020-06-08 | 2020-06-08 | Monitoring system for controlling emission of NH3 pollutants |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021039808.8U CN212646621U (en) | 2020-06-08 | 2020-06-08 | Monitoring system for controlling emission of NH3 pollutants |
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| CN212646621U true CN212646621U (en) | 2021-03-02 |
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| CN202021039808.8U Active CN212646621U (en) | 2020-06-08 | 2020-06-08 | Monitoring system for controlling emission of NH3 pollutants |
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