CN215388721U - Be applicable to well low temperature SCR denitration aqueous ammonia direct injection device - Google Patents
Be applicable to well low temperature SCR denitration aqueous ammonia direct injection device Download PDFInfo
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- CN215388721U CN215388721U CN202120567805.XU CN202120567805U CN215388721U CN 215388721 U CN215388721 U CN 215388721U CN 202120567805 U CN202120567805 U CN 202120567805U CN 215388721 U CN215388721 U CN 215388721U
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Abstract
The utility model relates to an ammonia water direct injection device suitable for medium and low temperature SCR denitration, which comprises an inlet flue, an SCR reactor and an outlet flue which are sequentially communicated, wherein at least one double-fluid atomizing nozzle is arranged in the inlet flue; a compressed air storage tank connected with the air compressor is sequentially connected with a valve, a filter and a metering distribution module to the two-fluid atomizing nozzle through pipelines, at least one ammonia water delivery pump connected with the ammonia water storage tank is sequentially connected with the valve, the filter and the metering distribution module through pipelines,A filter and a metering module to a two-fluid atomizing nozzle. According to the utility model, the two-fluid atomizing nozzle is arranged, ammonia water is atomized into fine water mist particles by the aid of compressed air, the fine water mist particles are sprayed into the flue and mixed with flue gas, atomized ammonia water can be rapidly evaporated, and NH is decomposed3The utility model can realize the effect of quickly evaporating the ammonia water, cancels the ammonia water evaporator in the original ammonia water evaporation system, reduces the consumption of energy media such as electricity or steam, reduces the operation and maintenance cost and achieves the aim of saving energy.
Description
Technical Field
The utility model relates to a denitration ammonia water direct injection device, in particular to a denitration ammonia water direct injection device suitable for medium and low temperature SCR.
Background
Oxynitride (NO, NO)2，N2O) are a major source of air pollution, they can produce photochemical smog, acid rain, ozone cavitation, and greenhouse effects. With the increasing emphasis on environmental protection in China, the standard emission of flue gas in the coking and steel industry in China is imperative. The flue gas denitration of the steel and coking industry basically adopts the SCR denitration technology. The SCR denitration technology is selective catalytic reduction technology, and NH is carried out under the action of a catalyst and in the presence of oxygen3Preferentially reacts with NOx to generate N2And H20. And the desulfurized flue gas enters the SCR reactor through the flue, and the ammonia supply system sprays ammonia gas into the flue gas. NO in the flue gas at the temperature of 180-300 DEG CxUnder the catalytic action of a catalyst in an SCR reactor, the catalyst and ammonia gas are subjected to chemical reaction to generate N2And H2O。
Now industrially applicable NH3The source is obtained mainly by hydrolysis and pyrolysis of urea or evaporation of liquid ammonia and ammonia water. Among them, the most widely used is the ammonia evaporation process. The traditional ammonia water evaporation needs to be separately provided with an ammonia water evaporator, steam or electricity is used as a heat source to heat the ammonia water to evaporate NH3And (4) carrying out denitration. The evaporation process consumes a large amount of energy and has high investment and operation cost. Patent CN202010270553.4 (an ammonia water evaporation device for SCR denitration injection system) introduces one path of hot air from the hot primary air main pipeline to directly evaporate ammonia water, avoiding high energy consumption of electric evaporation; CN201820459707.2 (SCR flue gas denitration device of direct injection aqueous ammonia) utilizes many spray guns that set up in parallel, stretches into the flue that SCR reaction unit anterior segment temperature is 270 ~ 550 ℃ inside, sprays into the aqueous ammonia and evaporates. The utility model can be used for denitration of power plant boiler, because the flue gas temperature of sintering machine, pellet, coke oven and the like in steel plant can not reachThe flue gas temperature of the boiler is not suitable for denitration of flue gas of steel mills and coke ovens.
Therefore, the prior art can not solve the problems of energy consumption and operation of ammonia evaporation in the denitration technology of steel plant and coke oven flue gas.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a medium-low temperature SCR denitration ammonia water direct injection device suitable for steel plants, coke oven plants and the like, to realize the effect of rapid evaporation of ammonia water and solve the problems of high energy consumption and high operation cost of ammonia water evaporation in the prior denitration technology.
In order to achieve the aim, the utility model provides an ammonia water direct injection device suitable for medium-low temperature SCR denitration, which comprises a compressed air conveying unit, an ammonia water conveying unit and an SCR reaction unit;
the SCR reaction unit comprises an inlet flue, an SCR reactor and an outlet flue which are sequentially communicated, wherein at least one double-fluid atomizing nozzle is arranged in the inlet flue;
the compressed air conveying unit comprises a compressed air storage tank connected with an air compressor, the compressed air storage tank is connected with the two-fluid atomizing nozzle through a compressed air pipeline, and the compressed air pipeline consists of a valve, a filter and a metering and distributing module which are sequentially connected through pipelines;
the ammonia water conveying unit comprises at least one ammonia water conveying pump connected with the ammonia water storage tank, the ammonia water conveying pump is connected with the double-fluid atomizing nozzle through an ammonia water pipeline, and the ammonia water pipeline consists of a valve, a filter and a metering distribution module which are sequentially connected through pipelines.
Preferably, the concentration of the ammonia water stored in the ammonia water storage tank is 20-25%.
Preferably, the valve is a pneumatic regulating valve.
In particular, at least one catalytic layer is arranged in the SCR reactor, and the two-fluid atomization nozzle is spaced from the catalytic layer by a distance of not less than 10 m.
Preferably, the metering module automatically adjusts the delivery volume.
Based on the technical scheme, the utility model has the advantages that: the utility model can cancel the ammonia evaporator in the original ammonia water evaporation system, reduce the consumption of energy media such as electricity or steam, reduce the operation and maintenance cost and achieve the aim of energy saving, and the arranged metering and distributing module can automatically adjust the delivered compressed air quantity and ammonia water quantity according to the smoke gas quantity in the SCR reaction unit and the NOx concentration in the smoke gas by computer simulation calculation so as to realize the automatic control of the system.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the utility model and together with the description serve to explain the utility model without limiting the utility model. In the drawings:
FIG. 1 is a schematic diagram of a medium-low temperature SCR denitration ammonia water direct injection device.
Detailed Description
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
The utility model provides an ammonia water direct injection device suitable for medium and low temperature SCR denitration, which is characterized in that: the device comprises a compressed air conveying unit, an ammonia water conveying unit and an SCR reaction unit; the SCR reaction unit comprises an inlet flue 8, an SCR reactor 9 and an outlet flue 10 which are sequentially communicated, wherein at least one two-fluid atomizing nozzle 7 is arranged in the inlet flue 8; the compressed air conveying unit comprises a compressed air storage tank 2 connected with an air compressor 1, the compressed air storage tank 2 is connected with the double-fluid atomizing nozzle 7 through a compressed air pipeline, and the compressed air pipeline consists of a valve, a filter 3 and a metering and distributing module 6 which are sequentially connected through pipelines; the ammonia water conveying unit comprises at least one ammonia water conveying pump 5 connected with an ammonia water storage tank 4, the ammonia water conveying pump 5 is connected with the two-fluid atomizing nozzle 7 through an ammonia water pipeline, and the ammonia water pipeline consists of a valve, a filter 3 and a metering and distributing module 6 which are sequentially connected through pipelines.
Preferably, the concentration of the ammonia stored in the ammonia storage tank 4 is 20% to 25%. The valve is airAnd (4) dynamically adjusting the valve. At least one catalytic layer is arranged in the SCR reactor 9, and the distance between the two-fluid atomization nozzle 7 and the catalytic layer is not less than 10 m. The two-fluid atomizing nozzle 7 is installed at a position which is at least 10m away from the catalyst layer to ensure that NH is generated3And the mixture is evaporated and mixed completely in the flue. The metering module 6 automatically adjusts the delivery volume.
The specific operation principle of the utility model is as follows:
compressed air is generated by an air compressor 1, stored in a compressed air storage tank 2, filtered by a filter 3 and then conveyed to a two-fluid atomizing nozzle 7.
20 to 25 percent of ammonia water is stored in an ammonia water storage tank 4 and is conveyed to a two-fluid atomizing nozzle 7 through an ammonia water conveying pump 5.
The ammonia water is pressurized and then conveyed to a double-fluid atomizing nozzle 7, the liquid is atomized into fine water mist particles with the help of compressed air, and the fine water mist particles are sprayed into a flue and mixed with flue gas. Because the diameter of the fog drops is very small, the fog drops can be quickly evaporated at 180-300 ℃ to decompose NH3And reacts with NOx in the SCR reactor. Because the device cancels the ammonia evaporator in the original ammonia evaporation system, the consumption of energy media such as electricity or steam is reduced, the operation and maintenance cost is reduced, and the energy-saving purpose is achieved.
Meanwhile, the metering and distributing module 6 is arranged on the compressed air pipeline and the ammonia water pipeline, a pneumatic adjusting valve is arranged, and the amount of the delivered compressed air and the amount of ammonia water can be automatically adjusted through computer simulation calculation according to the amount of smoke treated by SCR and the concentration of NOx in the smoke, so that the automatic control of the system is realized.
The utility model can cancel the ammonia water evaporator in the original ammonia water evaporation system, reduce the consumption of energy media such as electricity or steam, reduce the operation and maintenance cost and achieve the aim of energy saving, and the arranged metering and distributing module can be used for saving energy according to the smoke gas amount in the SCR reaction unit and NO in the smoke gasxThe concentration is calculated by computer simulation, the amount of the delivered compressed air and the amount of ammonia water are automatically adjusted, and the automatic control of the system is realized.
Example 1
The ammonia water direct injection device suitable for medium and low temperature SCR denitration of this embodiment sets up as follows:
as shown in fig. 1, the device comprises a compressed air delivery unit, an ammonia water delivery unit and an SCR reaction unit;
the SCR reaction unit comprises an inlet flue 8, an SCR reactor 9 and an outlet flue 10 which are sequentially communicated, wherein four double-fluid atomizing nozzles 7 are arranged in the inlet flue 8, and the double-fluid atomizing nozzles are supported in the reactor flue;
the compressed air conveying unit comprises a compressed air storage tank 2 connected with the air compressor 1, the compressed air storage tank 2 is connected with the two-fluid atomizing nozzle 7 through a compressed air pipeline, and the compressed air pipeline consists of a pneumatic regulating valve, a filter 3 and a metering and distributing module 6 which are sequentially connected through pipelines;
the ammonia water conveying unit comprises an ammonia water conveying pump 5 connected with an ammonia water storage tank 4, the ammonia water conveying pump 5 is connected with a double-fluid atomizing nozzle 7 through an ammonia water pipeline, and the ammonia water pipeline consists of a pneumatic adjusting valve, a filter 3 and a metering and distributing module 6 which are sequentially connected through pipelines.
Wherein the concentration of the ammonia water stored in the ammonia water storage tank 4 is 20%, three catalyst layers are arranged in the SCR reactor 9, and the distance between the two-fluid atomization nozzle 7 and the first catalyst layer is 11 m.
Example 2
The ammonia water direct injection device suitable for medium and low temperature SCR denitration of this embodiment sets up as follows:
the denitration ammonia water direct injection device comprises a compressed air conveying unit, an ammonia water conveying unit and an SCR reaction unit;
the SCR reaction unit comprises an inlet flue 8, an SCR reactor 9 and an outlet flue 10 which are sequentially communicated, wherein 1 double-fluid atomizing nozzle 7 is arranged in the inlet flue 8 and supported in the reactor flue;
the compressed air conveying unit comprises a compressed air storage tank 2 connected with the air compressor 1, the compressed air storage tank 2 is connected with the two-fluid atomizing nozzle 7 through a compressed air pipeline, and the compressed air pipeline consists of a pneumatic regulating valve, a filter 3 and a metering and distributing module 6 which are sequentially connected through pipelines;
the ammonia water conveying unit comprises two ammonia water conveying pumps 5 connected with an ammonia water storage tank 4, the ammonia water conveying pumps 5 are connected with a double-fluid atomizing nozzle 7 through an ammonia water pipeline, and the ammonia water pipeline consists of a pneumatic regulating valve, a filter 3 and a metering and distributing module 6 which are sequentially connected through pipelines.
Wherein, the concentration of the ammonia water stored in the ammonia water storage tank 4 is 25%, a catalyst layer is arranged in the SCR reactor 9, and the distance between the two-fluid atomization nozzle 7 and the catalyst layer is 15 m.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the utility model or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the utility model as defined by the appended claims.
Claims (5)
1. The utility model provides a be applicable to well low temperature SCR denitration aqueous ammonia direct injection device which characterized in that: the device comprises a compressed air conveying unit, an ammonia water conveying unit and an SCR reaction unit;
the SCR reaction unit comprises an inlet flue (8), an SCR reactor (9) and an outlet flue (10) which are sequentially communicated, wherein at least one double-fluid atomizing nozzle (7) is arranged in the inlet flue (8);
the compressed air conveying unit comprises a compressed air storage tank (2) connected with an air compressor (1), the compressed air storage tank (2) is connected with the two-fluid atomizing nozzle (7) through a compressed air pipeline, and the compressed air pipeline consists of a valve, a filter (3) and a metering and distributing module (6) which are sequentially connected through pipelines;
the ammonia water conveying unit comprises at least one ammonia water conveying pump (5) connected with an ammonia water storage tank (4), the ammonia water conveying pump (5) is connected with the two-fluid atomizing nozzle (7) through an ammonia water pipeline, and the ammonia water pipeline consists of a valve, a filter (3) and a metering distribution module (6) which are sequentially connected through pipelines.
2. The denitration ammonia water direct injection device according to claim 1, characterized in that: the concentration of the ammonia water stored in the ammonia water storage tank (4) is 20-25%.
3. The denitration ammonia water direct injection device according to claim 1, characterized in that: the valve is a pneumatic adjusting valve.
4. The denitration ammonia water direct injection device according to any one of claims 1 to 3, characterized in that: at least one catalytic layer is arranged in the SCR reactor (9), and the distance between the two-fluid atomization nozzle (7) and the catalytic layer is not less than 10 m.
5. The denitration ammonia water direct injection device according to claim 1, characterized in that: the metering and dispensing module (6) automatically adjusts the delivery volume.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120567805.XU CN215388721U (en) | 2021-03-19 | 2021-03-19 | Be applicable to well low temperature SCR denitration aqueous ammonia direct injection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120567805.XU CN215388721U (en) | 2021-03-19 | 2021-03-19 | Be applicable to well low temperature SCR denitration aqueous ammonia direct injection device |
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