CN212327950U - SCR high-efficiency flue gas denitration device - Google Patents
SCR high-efficiency flue gas denitration device Download PDFInfo
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- CN212327950U CN212327950U CN202020861344.2U CN202020861344U CN212327950U CN 212327950 U CN212327950 U CN 212327950U CN 202020861344 U CN202020861344 U CN 202020861344U CN 212327950 U CN212327950 U CN 212327950U
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Abstract
The utility model discloses a SCR high-efficiency flue gas denitration device, which relates to the technical field of flue gas treatment and comprises a catalytic reactor; the gas-liquid separation device comprises a gas inlet pipeline, a gas outlet pipeline and a gas outlet pipeline, wherein the gas inlet pipeline comprises a main flue, a cooling flue and a heating flue, the gas inlet ends of the cooling flue and the heating flue are communicated with the gas outlet end of the main flue, the gas outlet ends of the cooling flue and the heating flue are communicated with the gas inlet end of the catalytic reactor, a reducing agent adding mechanism is arranged in the main flue, a cooling water adding device is arranged in the cooling flue, and an electric heating device is arranged in the heating flue; the gas inlet end of the smoke exhaust pipeline is communicated with the gas outlet end of the catalytic reactor; and a temperature sensor. The utility model discloses can carry out real-time measurement to the flue gas temperature to heat up or cool down the processing to the flue gas, make the flue gas temperature be in the service temperature within range of catalyst, not only guaranteed the denitration quality of flue gas, and prolonged the life of catalyst.
Description
Technical Field
The utility model relates to a flue gas treatment technical field especially relates to a high-efficient flue gas denitrification facility of SCR.
Background
The selective catalytic reduction method is to use a reducing agent to selectively react with NO in the flue gas under the action of a catalystXReacting and generating nontoxic and pollution-free N2And H2And O. SCR technology (selective catalytic reduction method) for NO in flue gasXThe control effect is very obvious, the technology is mature, and the flue gas denitration technology which is most applied and has the most effect in the world is formed at present.
At present, catalysts adopted in an SCR flue gas denitration system have a designed use temperature range, such as a vanadium-based catalyst, and the use temperature range is 260-450 ℃; the application temperature range of the catalyst is 350-650 ℃. When the temperature of the flue gas reacting with the catalyst is lower than the use temperature range, the denitration effect can be influenced, and when the temperature of the flue gas reacting with the catalyst is too high, the activity of the catalyst can be lost, so that the service life of the catalyst is greatly shortened.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that, overcome prior art's shortcoming, provide a high-efficient flue gas denitrification facility of SCR.
In order to solve the technical problem, the technical scheme of the utility model as follows:
an SCR high-efficiency flue gas denitration device comprises a catalytic reactor, wherein a plurality of layers of catalysts are arranged in the catalytic reactor; the gas-liquid separation device comprises a gas inlet pipeline, a gas outlet pipeline and a gas outlet pipeline, wherein the gas inlet pipeline comprises a main flue, a cooling flue and a heating flue, the gas inlet ends of the cooling flue and the heating flue are communicated with the gas outlet end of the main flue, the gas outlet ends of the cooling flue and the heating flue are communicated with the gas inlet end of the catalytic reactor, a reducing agent adding mechanism is arranged in the main flue, a cooling water adding device is arranged in the cooling flue, an electric heating device is arranged in the heating flue, and the gas inlet ends of the cooling flue and the heating flue are provided with valves for switching on and off the flues; the gas inlet end of the smoke exhaust pipeline is communicated with the gas outlet end of the catalytic reactor; and the temperature sensor is arranged in the main flue and positioned at the rear side of the reducing agent adding mechanism and is used for measuring the temperature of the flue gas in the main flue.
As a preferred scheme of the high-efficient flue gas denitration device of SCR, wherein: the reducing agent adding mechanism comprises a reducing agent adding nozzle arranged in the main flue, and the reducing agent adding nozzle is communicated with a urea solution supply position outside the main flue.
As a preferred scheme of the high-efficient flue gas denitration device of SCR, wherein: the cooling water adding device comprises a cooling nozzle arranged in the cooling flue, and the cooling nozzle is communicated with a cooling water supply position outside the cooling flue.
As a preferred scheme of the high-efficient flue gas denitration device of SCR, wherein: be located in the main flue the reducing agent adds the front side of nozzle and be located in the cooling flue the front side of cooling nozzle all is provided with the orifice plate, a plurality of through-hole has evenly been seted up on the orifice plate, the equal perpendicular to flow direction setting of flue gas of orifice plate.
As a preferred scheme of the high-efficient flue gas denitration device of SCR, wherein: the electric heating device comprises a plurality of electric heating pipes which are sequentially arranged along the length direction of the heating flue, and each electric heating pipe can be independently opened or closed.
The utility model has the advantages that:
(1) the utility model is provided with a temperature sensor in the main flue, and a cooling flue and a heating flue are connected between the main flue and the catalytic reactor, the temperature sensor can measure the flue gas temperature in the main flue in real time, and select the flow direction of the flue gas according to the measured flue gas temperature, so that the flue gas temperature entering the catalytic reactor is in the use temperature range of the catalyst, thereby not only ensuring the denitration quality of the flue gas, but also prolonging the service life of the catalyst;
(2) the urea solution in the utility model not only is used as a reducing agent, but also can pre-cool the high-temperature flue gas entering the main flue after being mixed with the flue gas, so that the temperature of the flue gas in the main flue is relatively close to the service temperature range of the catalyst, and the subsequent temperature adjustment operation is convenient;
(3) the utility model is provided with the pore plates at the front sides of the reducing agent adding nozzle and the cooling nozzle, the pore plates can not only reduce the flow speed of the flue gas, thereby prolonging the contact time of the flue gas with the reducing agent and the cooling water, improving the cooling effect of the flue gas, but also the flue gas passing through the pore plates can move more uniformly along the flue;
(4) the utility model discloses well electric heater unit adopts is a plurality of electric heating pipe that set gradually along intensification flue length direction, and is independent mutually between these a plurality of electric heating pipe to several electric heating pipe wherein can be opened selectively according to the flue gas temperature that temperature sensor measured, can effectively reduce the energy consumption under the prerequisite of guaranteeing that the flue gas temperature that gets into in the catalytic reactor meets the requirements.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural view of an SCR high-efficiency flue gas denitration device provided by the present invention;
wherein: 1. a catalytic reactor; 2. a catalyst; 3. a main flue; 4. cooling the flue; 5. heating the flue; 6. a smoke exhaust duct; 7. a temperature sensor; 8. a reducing agent addition nozzle; 9. a cooling nozzle; 10. an orifice plate; 11. an electric heating tube.
Detailed Description
In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
At present, catalysts 2 adopted in an SCR flue gas denitration system have a designed use temperature range, such as a vanadium-based catalyst 2, and the use temperature range is 260-450 ℃; the use temperature range of the catalyst 2 is 350-650 ℃. When the temperature of the flue gas reacting with the catalyst 2 is lower than the use temperature range, the denitration effect can be influenced, and when the temperature of the flue gas reacting with the catalyst 2 is too high, the activity of the catalyst 2 can be lost, so that the service life of the catalyst 2 is greatly shortened.
Referring to fig. 1, in view of this, the embodiment provides an SCR high-efficiency flue gas denitration device, a main body of the device includes a flue gas inlet pipe, a catalytic reactor 1 and a flue gas exhaust pipe 6 which are connected in sequence, flue gas to be processed is mixed with a reducing agent in the flue gas inlet pipe, then enters the catalytic reactor 1, realizes flue gas denitration under the action of a catalyst 2, and finally is discharged by the flue gas exhaust pipe 6.
Specifically, the smoke inlet pipeline comprises a main flue 3, a cooling flue 4 and a heating flue 5. The air inlet end of the main flue 3 is an air inlet of high-temperature flue gas. A reducing agent adding mechanism for adding a reducing agent is arranged in the main flue 3, the reducing agent adding mechanism comprises a reducing agent nozzle extending into the main flue 3, the feeding end of the reducing agent nozzle is communicated with a reducing agent supply position outside the main flue 3 through a feeding pipe and a feeding pump, the reducing agent at the reducing agent supply position can be conveyed to the reducing agent nozzle through the feeding pipe when the feeding pump works, and finally the reducing agent is sprayed into the main flue 3 through the reducing agent nozzle and is mixed with the flue gas in the main flue 3. Wherein, the reducing agent adopts urea solution.
Along the flowing direction of the flue gas, a temperature sensor 7 is arranged in the main flue 3 behind the reducing agent nozzle, and the temperature sensor 7 can measure the temperature of the flue gas at the rear part of the main flue 3 in real time.
The air inlet ends of the cooling flue 4 and the heating flue 5 are communicated with the air outlet end of the main flue 3. Electromagnetic valves for controlling the on-off of the flues are arranged at the air inlet ends of the cooling flue 4 and the heating flue gas. When the electromagnetic valve in the cooling flue 4 is opened and the electromagnetic valve in the heating flue 5 is closed, the flue gas in the main flue 3 can only enter the cooling flue 4; when the electromagnetic valve in the cooling flue 4 is closed and the electromagnetic valve in the heating flue 5 is opened, the flue gas in the main flue 3 can only enter the heating flue 5.
Preferably, the temperature sensor 7 in the main flue 3 and the electromagnetic valves in the cooling flue 4 and the warming flue 5 are electrically connected with an external controller. After the temperature sensor 7 transmits the measured temperature signal to the controller, the controller judges the flow direction of the flue gas according to the temperature of the flue gas, and then controls the electromagnetic valves in the cooling flue 4 and the heating flue 5 to realize automatic control. The temperature sensor 7 and the electrical connection between the solenoid valve and the controller are conventional and will not be described here.
Be provided with in cooling flue 4 and be used for adding the device to the cooling water of flue gas cooling, this cooling water adds the device including the cooling nozzle 9 that is located cooling flue 4, this cooling nozzle 9's feed liquor end is through feed liquor pipe and the outer cooling water supply department intercommunication of pump body and cooling flue 4, pump body during operation can pass through the feed liquor pipe with the cooling water and carry to cooling nozzle 9, spray to cooling flue 4 in by cooling nozzle 9, and mix with the flue gas that is located cooling flue 4, realize the cooling to the flue gas.
An electric heating device for heating the flue gas is arranged in the warming flue 5, the electric heating device comprises a plurality of electric heating pipes 11 which are sequentially arranged along the length direction of the warming flue 5, and each electric heating pipe 11 can work independently. The heat generated by the electric heating pipe 11 during operation can be transferred to the flue gas in the temperature rising flue 5 in a heat transfer mode, so that the flue gas is heated and heated.
The gas inlet end of the catalytic reactor 1 is communicated with the gas outlet ends of the cooling flue 4 and the heating flue 5, namely, the flue gas in the cooling flue 4 and the heating flue 5 can enter the catalytic reactor 1. A plurality of layers of catalyst 2 are arranged in the catalytic reactor 1. The gas outlet end of the catalytic reactor 1 is communicated with the gas inlet end of the smoke exhaust pipeline 6.
When the denitration device works, high-temperature flue gas to be treated enters a main flue 3, a reducing agent nozzle sprays urea solution into the main flue 3 to be mixed with the flue gas, then the flue gas moves to the rear end of the main flue 3, a temperature sensor 7 at the rear end of the main flue 3 measures the temperature of the flue gas and transmits a measured temperature signal to a controller, the controller compares the temperature of the flue gas with the use temperature range of a catalyst 2, if the temperature of the flue gas is higher than the use temperature range of the catalyst 2, an electromagnetic valve in a heating flue 5 is controlled to be closed, the electromagnetic valve in a cooling flue 4 is opened, the flue gas in the main flue 3 enters the cooling flue 4, then a cooling nozzle 9 in the cooling flue 4 sprays cooling water into the cooling flue 4, the flue gas is cooled to be in the use temperature range of the catalyst 2, and then the flue gas enters a catalytic reactor 1, the flue gas denitration is realized under the action of the catalyst 2; if the flue gas temperature in the main flue 3 is lower than the use temperature range of the catalyst 2, the electromagnetic valve in the heating flue 5 is controlled to be opened, the electromagnetic valve in the cooling flue 4 is closed, the flue gas in the main flue 3 enters the heating flue 5, at the moment, an operator can selectively open one or more electric heating pipes 11 according to the difference value between the flue gas temperature in the main flue 3 and the use temperature of the catalyst 2, the flue gas in the heating flue 5 is heated to be within the use temperature range of the catalyst 2, and then the flue gas enters the catalytic reactor 1, and the flue gas denitration is realized under the action of the catalyst 2.
In addition, a pore plate 10 perpendicular to the flow direction of the flue gas is arranged on the front side of the reducing agent adding nozzle 8 in the main flue 3 and on the front side of the cooling nozzle 9 in the cooling flue 4, and a plurality of through holes are uniformly formed in the pore plate 10. The pore plate 10 can reduce the flow speed of the flue gas, so that the contact time of the flue gas with the reducing agent and the cooling water is prolonged, the cooling effect of the flue gas is improved, and the flue gas passing through the pore plate 10 can move along the flue more uniformly.
Therefore, the utility model discloses can carry out real-time measurement to the flue gas temperature to select the flow direction of flue gas according to the temperature that records, heat up or cool down the processing to the flue gas, make the flue gas temperature be in catalyst 2's service temperature within range, not only guaranteed the denitration quality of flue gas, and prolonged catalyst 2's life.
In addition to the above embodiments, the present invention may have other embodiments; all the technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope claimed by the present invention.
Claims (5)
1. The utility model provides a high-efficient flue gas denitrification facility of SCR which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
a catalytic reactor (1) in which a plurality of layers of catalysts (2) are arranged;
the flue gas purification device comprises a gas inlet pipe, wherein the gas inlet pipe comprises a main flue (3), a cooling flue (4) and a warming flue (5), the air inlet ends of the cooling flue (4) and the warming flue (5) are communicated with the air outlet end of the main flue (3), the air outlet ends of the cooling flue (4) and the warming flue (5) are communicated with the air inlet end of the catalytic reactor (1), a reducing agent adding mechanism is arranged in the main flue (3), a cooling water adding device is arranged in the cooling flue (4), an electric heating device is arranged in the warming flue (5), and valves for switching on and off the flues are arranged at the air inlet ends of the cooling flue (4) and the warming flue (5);
the gas inlet end of the smoke exhaust pipeline (6) is communicated with the gas outlet end of the catalytic reactor (1); and the number of the first and second groups,
and the temperature sensor (7) is arranged in the main flue (3) and positioned at the rear side of the reducing agent adding mechanism and is used for measuring the temperature of the flue gas in the main flue (3).
2. The SCR efficient flue gas denitration device of claim 1, wherein: the reducing agent adding mechanism comprises a reducing agent adding nozzle (8) arranged in the main flue (3), and the reducing agent adding nozzle (8) is communicated with a urea solution supply position outside the main flue (3).
3. The SCR efficient flue gas denitration device of claim 2, wherein: the cooling water adding device comprises a cooling nozzle (9) arranged in the cooling flue (4), and the cooling nozzle (9) is communicated with a cooling water supply position outside the cooling flue (4).
4. The SCR efficient flue gas denitration device of claim 3, wherein: be located in main flue (3) the front side that the reducing agent added nozzle (8) and be located in cooling flue (4) the front side of cooling nozzle (9) all is provided with orifice plate (10), a plurality of through-hole has evenly been seted up on orifice plate (10), the flow direction setting of the equal perpendicular to flue gas of orifice plate (10).
5. The SCR efficient flue gas denitration device of claim 1, wherein: the electric heating device comprises a plurality of electric heating pipes (11) which are sequentially arranged along the length direction of the warming flue (5), and the plurality of electric heating pipes (11) can be independently opened or closed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020861344.2U CN212327950U (en) | 2020-05-21 | 2020-05-21 | SCR high-efficiency flue gas denitration device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020861344.2U CN212327950U (en) | 2020-05-21 | 2020-05-21 | SCR high-efficiency flue gas denitration device |
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| CN212327950U true CN212327950U (en) | 2021-01-12 |
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| CN202020861344.2U Active CN212327950U (en) | 2020-05-21 | 2020-05-21 | SCR high-efficiency flue gas denitration device |
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