CN114669424A - Catalyst step loading method - Google Patents
Catalyst step loading method Download PDFInfo
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- CN114669424A CN114669424A CN202210254242.8A CN202210254242A CN114669424A CN 114669424 A CN114669424 A CN 114669424A CN 202210254242 A CN202210254242 A CN 202210254242A CN 114669424 A CN114669424 A CN 114669424A
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- liquid inlet
- catalyst
- active component
- spraying
- spraying device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/06—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies
- B05B13/0627—Arrangements of nozzles or spray heads specially adapted for treating the inside of hollow bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/02—Spray pistols; Apparatus for discharge
- B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
- B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
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- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
- Catalysts (AREA)
Abstract
The invention discloses a catalyst step loading method, which comprises the following steps: providing a spraying device and a control device, wherein the spraying device is provided with a liquid inlet pipe, an air inlet pipe, a liquid inlet, an air inlet and a spraying port, active component solution is introduced into the liquid inlet, compressed gas is introduced into the air inlet, and the control device is used for adjusting the pressure of the air inlet pipe, the flow of the liquid inlet pipe and the concentration of the active component solution; and placing one end of the spraying device into a pore channel of the catalyst, spraying the active component gas-liquid mixture on the inner wall of the pore channel by using the spraying device, and controlling the spraying device to move along the inner wall of the pore channel according to a preset direction and a preset speed until the spraying device moves to a preset position. The catalyst gradient loading method provided by the embodiment of the invention has the advantages that the loss of the medicament is less, the cost of the catalyst regeneration process is reduced, and the gradient loading of the active components of the catalyst is realized.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a catalyst step loading method.
Background
SCR catalyst regeneration is an economically efficient solution in catalyst life management schemes. The denitration performance of the catalyst can be effectively enhanced by introducing the active component in the catalyst, and the loading of the active component is important for recovering the denitration performance of the catalyst and controlling the conversion rate of SO2/SO 3.
In the deep regeneration process, the load of the active component is the main cost, and the introduction of the active component in the catalyst can effectively enhance the denitration performance of the catalyst, but can also cause the increase of the oxidation rate of side reactions, so the control of the concentration of the active component is very important.
The active components are lost in the regeneration process of the catalyst, and the active components need to be replenished and recovered in the last step of the regeneration process. The conventional method for supplementing the active component is an impregnation method, but the conventional method has more medicament loss and is not fine enough in concentration control, so that the gradient loading of the active component of the same batch of catalysts is difficult to realize, the cost is increased, and the optimal use effect of the active component is difficult to achieve.
Disclosure of Invention
The present invention is directed to solving, at least in part, one of the technical problems in the related art.
Therefore, the embodiment of the invention provides a method for loading a catalyst in a step mode.
The catalyst step loading method provided by the embodiment of the invention comprises the following steps:
providing a spraying device, wherein the spraying device is provided with a liquid inlet pipe, an air inlet pipe, a liquid inlet, an air inlet and a spraying port, active component solution is introduced into the liquid inlet through the liquid inlet pipe, and compressed gas is introduced into the air inlet through the air inlet pipe;
Providing a control device, and adjusting the pressure of the air inlet pipe, the flow of the liquid inlet pipe and the concentration of the active component solution by using the control device;
placing one end of the spraying device into a pore channel of a catalyst, mixing the compressed gas and the active component solution in the spraying device to form an active component gas-liquid mixture, spraying the active component gas-liquid mixture on the inner wall of the pore channel by using the spraying device, and controlling the spraying device to move along the inner wall of the pore channel according to a preset direction and a preset speed by using the control device;
and when the spraying device moves to the preset position, stopping spraying.
The catalyst gradient loading method provided by the embodiment of the invention supplements the active components of the catalyst in a spraying manner, compared with the traditional impregnation method, the spraying manner has little loss of the medicament, the cost of the catalyst regeneration process is greatly reduced, and the spraying device can control the concentration of the medicament and realize gradient loading of the active components of the catalyst.
In some embodiments, during the process of spraying the active component gas-liquid mixture on the inner wall of the pore passage by the spraying device, the control device can adjust the pressure of the gas inlet pipe, the flow rate of the liquid inlet pipe and the concentration of the active component solution according to the active component loss condition of the catalyst.
In some embodiments, the spraying device includes a plurality of spray guns, each spray gun includes a nozzle and a spray gun tube, the nozzle includes a nozzle body, the nozzle body has the liquid inlet, the air inlet and the spray outlet, a first end of the spray gun tube is connected to the nozzle body, the spray gun tube is provided with the liquid inlet tube and the air inlet tube therein, the liquid inlet tube is communicated with the liquid inlet, and the air inlet tube is communicated with the air inlet.
In some embodiments, the cross-sectional area of the liquid inlet is greater than that of the air inlet, the mouth is internally provided with a mixing cavity, the liquid inlet is communicated with the mixing cavity through a liquid inlet channel, the air inlet is communicated with the mixing cavity through an air inlet channel, and the spray port is communicated with the mixing cavity and is used for spraying out a gas-liquid mixture in the mixing cavity.
In some embodiments, the liquid inlet is one, the air inlets are multiple, the axis of the liquid inlet and the axis of the mouth body are collinear, and the air inlets are arranged at intervals along the circumferential direction of the liquid inlet.
In some embodiments, the mixing cavity includes a first chamber and a second chamber sequentially arranged in a direction from the liquid inlet to the ejection port, the first chamber communicates with the second chamber, the liquid inlet channel extends into the second chamber, and a cross-sectional area of the first chamber is kept constant and a cross-sectional area of the second chamber is gradually reduced in the direction from the liquid inlet to the ejection port.
In some embodiments, the spout has an umbrella shape, and the liquid inlet has a cross-sectional area that gradually increases in a direction toward the spout.
In some embodiments, the nozzle further comprises a plurality of connecting columns, one end of each connecting column is connected with the nozzle body, the other end of each connecting column is connected with the ejection hole, and the connecting columns are arranged at intervals along the circumferential direction of the ejection hole.
In some embodiments, the nozzle body comprises a first section and a second section which are arranged in sequence in the direction from the liquid inlet to the ejection port, and the cross-sectional area of the first section is smaller than that of the second section.
In some embodiments, the spray gun further comprises a mounting seat, a first valve and a second valve, the mounting seat is arranged at the second end of the spray gun tube, the first valve and the second valve are both mounted on the mounting seat, the first valve is used for controlling the liquid inlet pipe to be opened and closed, and the second valve is used for controlling the air inlet pipe to be opened and closed.
Drawings
FIG. 1 is a schematic view of a spray coating device according to an embodiment of the present invention
FIG. 2 is a schematic view of a nozzle of an embodiment of the present invention.
FIG. 3 is a cross-sectional view of a nozzle of an embodiment of the present invention.
FIG. 4 is a schematic view of a spray gun according to an embodiment of the present invention.
Reference numerals are as follows:
the nozzle 1, the nozzle body 11, the first section 111, the second section 112, the liquid inlet 12, the air inlet 13, the spraying port 14, the mixing cavity 15, the first cavity 151, the second cavity 152, the liquid inlet channel 16, the air inlet channel 17, the connecting column 18,
a spray gun 2, a spray gun pipe 21, a liquid inlet pipe 22, an air inlet pipe 23, a mounting seat 24,
the spraying device 30, the base 31, the control device 32 and the hoisting device 33.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The catalyst step loading method according to the embodiment of the present invention is described below with reference to the drawings.
As shown in fig. 1, the method for loading a catalyst in a step mode according to an embodiment of the present invention includes the following steps:
providing a spraying device 30, wherein the spraying device 30 is provided with a liquid inlet pipe 22, an air inlet pipe 23, a liquid inlet 12, an air inlet 13 and a spray port 14, an active component solution is introduced into the liquid inlet 12 by using the liquid inlet pipe 22, and a compressed gas is introduced into the air inlet 13 by using the air inlet pipe 23, and the active component solution is a solution consisting of active components and water according to a certain ratio;
Providing a control device 32, wherein the control device 32 can be a computer and a PLC (programmable logic controller), sending a control instruction to the PLC through the computer, and adjusting the pressure of the air inlet pipe 23, the flow of the liquid inlet pipe 22 and the concentration of the active component solution by using the control device 32;
putting one end of a spraying device 30 into a pore channel of the catalyst, spraying an active component gas-liquid mixture to the inner wall of the pore channel by using a spraying port 14 of the spraying device 30, and controlling the spraying device 30 to move along the inner wall of the pore channel according to a preset direction and a preset speed by a control device 32;
when the spray device 30 is moved to the predetermined position, the spraying of the individual catalyst channels is completed, the spraying is stopped and the spray device 30 is removed from the channels.
It should be noted that a single catalyst typically has a plurality of openings, such as 20 x 20 openings, 18 x 18 openings, etc., and in order to improve the spraying efficiency, the spraying device 30 used in the embodiment of the present invention is composed of a plurality of spray guns 2
The spraying device 30 can simultaneously carry out step loading on all pore channels of a single catalyst, and the spraying effect is improved.
Specifically, the preparation method of the spraying device 30 includes: the number of the pore channels is determined according to the type of the catalyst, a base 31 with a corresponding number of interfaces is designed, then a plurality of spray guns 2 provided with nozzles 1 are fixed on the interfaces of the base 31, and then a fixing plate is pretended on the base 31, thus completing the preparation of the spraying device 30.
When spraying the catalyst, the fixed plate of the spraying device 30 is lifted by the lifting device 33, the nozzle 1 is moved into the duct of the catalyst with the nozzle 1 facing downward, and the lifting device 33 is controlled by the controller to adjust the moving direction and speed of the spraying device 30.
The catalyst gradient loading method provided by the embodiment of the invention supplements the active components of the catalyst in a spraying manner, compared with the traditional impregnation method, the spraying manner has little loss of the medicament, the cost of the catalyst regeneration process is greatly reduced, and the spraying device can realize the control of the medicament concentration and realize the gradient loading of the active components of the catalyst.
In some embodiments, during the process of spraying the gas-liquid mixture of the active component onto the inner wall of the duct by the nozzle 1, the control device 32 may adjust the pressure of the gas inlet pipe 23, the flow rate of the liquid inlet pipe 22, and the ratio of the active component to the water according to the active component loss condition of the catalyst.
For example, the amount of active components required at the windward end of the catalyst is the largest, and the amount of active components required is gradually reduced in the direction from the windward end of the catalyst to the other end of the catalyst, and the duct may be divided into a plurality of sections according to different catalysts, and the active components used in different sections have different contents, and are adjusted and controlled by the control device 32.
As shown in fig. 2-4, in some embodiments, the spray coating device 30 includes a plurality of spray guns 2, the spray guns 2 including a nozzle 1 and a spray gun tube 21, the nozzle 1 including a nozzle body 11, the nozzle body 11 having a liquid inlet 12, a gas inlet 13 and an outlet port 14, the liquid inlet 12 for delivering a solution having an active component to the nozzle body 11, the gas inlet 13 for delivering a compressed gas into the spray nozzle 1, the liquid inlet 12 having a cross-sectional area greater than that of the gas inlet 13.
The first pot head of spray gun pipe 21 is established in the first section 111 outside of nozzle body 11 to install nozzle 1 on spray gun pipe 21, be equipped with feed liquor pipe 22 and intake pipe 23 in the spray gun pipe 21, feed liquor pipe 22 and inlet 12 intercommunication, intake pipe 23 and air inlet 13 intercommunication, active component solution passes through feed liquor pipe 22 in spray gun pipe 21 and gets into nozzle body 11, and compressed gas passes through intake pipe 23 in spray gun pipe 21 and gets into nozzle body 11.
The nozzle body 11 is internally provided with a mixing cavity 15, the liquid inlet 12 is communicated with the mixing cavity 15 through a liquid inlet channel 16, the air inlet 13 is communicated with the mixing cavity 15 through an air inlet channel 17, a solution with active components and compressed gas are mixed in the mixing cavity 15 of the nozzle body 11 to form a gas-liquid mixture, the mixing cavity 15 is communicated with a spray port 14, the compressed gas and the active component solution in the mixing cavity 15 form a vaporous gas-liquid mixture under the action of pressure, and the vaporous gas-liquid mixture is sprayed out through the spray port 14 and sprayed on a catalyst, so that the loading of the active components of the catalyst is realized.
The nozzle 1 of the embodiment of the invention supplements the active components of the catalyst in a spraying mode, compared with the traditional dipping method, the spraying mode has little loss of the medicament, the cost of the catalyst regeneration process is greatly reduced, the nozzle 1 can easily realize the control of the medicament concentration, the stepped load of the active components of the catalyst is favorably realized, active component solutions with different concentrations are sprayed to different positions of the catalyst, the medicament is more scientifically and finely used, the medicament loss can be further reduced, and the utilization rate is improved.
It should be noted that, the introduction of the active component in the catalyst can effectively enhance the denitration performance of the catalyst, but at the same time, the oxidation rate of the side reaction is increased, and the performance optimization can be realized through the step load quantitative control.
The general length of the catalyst is about 80cm to 120cm, active sites on the surface of the catalyst adsorb ammonia, and nitrogen oxides in flue gas flow through a catalyst channel and then react with the ammonia. The diffusion rate of the nitrogen oxides into the microporous pore channels limits the occurrence rate of the whole reaction. In the initial stage of flue gas mixing, turbulence is formed at the windward end of the catalyst, the gas mixing intensity is high, the diffusion is fast, the ammonia nitrogen ratio is high, the side reaction is small, the ammonia concentration is high, the reaction activity is high, and the middle part and the tail end are laminar flows. Slow diffusion, small strength, stable flow, almost no diffusion in the direction perpendicular to the flow direction, low ammonia nitrogen ratio and strong side reaction, so the vanadium concentration needs to be reduced. The ammonia concentration of the middle section and the rear section of the windward end is low during ammonia spraying diffusion. In other words, the most active components are needed at the windward end of the catalyst, and the required amount of the active components is gradually reduced in the direction from the windward end of the catalyst to the other end of the catalyst, so that it is important to reduce the cost, improve the utilization rate of the active components, and realize the step loading of the active components.
In some embodiments, the liquid inlet 12 is one, the gas inlet 13 is a plurality of gas inlets 12, the liquid inlet 12 is located substantially at the centre of the nozzle body 11, the axis of the liquid inlet 12 and the axis of the nozzle body 11 are collinear, the plurality of gas inlets 13 are spaced circumferentially of the liquid inlet 12, and the cross-sectional area of the liquid inlet 12 is greater than the cross-sectional area of a single gas inlet 13. The plurality of air inlets 13 can simultaneously introduce compressed gas into the mixing cavity 15, so that the active component solution and the compressed air ports can be mixed more fully, and the gas-liquid mixture sprayed from the spraying ports 14 is more uniform.
In some embodiments, the mixing cavity 15 includes a first chamber 151 and a second chamber 152 sequentially arranged in a direction from the liquid inlet 12 to the ejection port 14, the first chamber 151 communicates with the second chamber 152, an outlet of the air inlet channel 17 is located in the first chamber 151, and the liquid inlet channel 16 extends into the second chamber 152.
Further, the cross-sectional area of the first chamber 151 is kept constant in the direction from the liquid inlet 12 to the ejection port 14, the first chamber 151 is cylindrical in shape, the cross-sectional area of the second chamber 152 gradually decreases, and the second chamber 152 is rounded off.
So set up, active ingredient solution accessible inlet channel 16 directly enters into in the second cavity 152 to because second cavity 152 is the radius platform form roughly, active ingredient solution can be to the diffusion that flows all around, compressed gas enters into first cavity 151 through inlet channel 17 in, and a plurality of inlet channel 17 are located inlet channel 16's week side, and compressed gas can fully contact with active ingredient solution, further makes active ingredient solution and compressed gas's mixture more abundant.
In some embodiments, the spray opening 14 is umbrella-shaped, and the cross-sectional area of the liquid inlet 12 of the spray opening 14 gradually increases towards the spray opening 14, so that the gas-liquid mixture sprayed from the spray opening 14 is also umbrella-shaped and spreads around, and can be uniformly sprayed in the pore channels of the catalyst, which is beneficial to improving the spraying efficiency.
In some embodiments, the nozzle 1 further includes a plurality of connection columns 18 for fixing the ejection orifices 14, one end of the connection column 18 is connected to the nozzle body 11, the other end of the connection column 18 is connected to the ejection orifices 14, and the plurality of connection columns 18 are arranged at intervals in the circumferential direction of the ejection orifices 14.
The nozzle body 11 comprises a first section 111 and a second section 112 arranged in sequence from the liquid inlet 12 to the ejection port 14, the first section 111 is connected with the second section 112, the cross-sectional area of the first section 111 is smaller than that of the second section 112, and the first section 111 is used for connecting the nozzle 1 with the lance tube 21, so that the nozzle 1 is fixed on the lance 2 for use.
The lance pipe 21 is supported by acid and alkali resistant steel, the diameter of the pipe body is 5-6mm, and the length of the pipe is about 1000 mm.
In some embodiments, the spray gun 2 further comprises a mounting seat 24, a first valve (not shown) and a second valve (not shown), wherein the mounting seat 24 is arranged at the second end of the spray gun tube 21, the first valve and the second valve are both arranged on the mounting seat 24, the first valve is used for controlling the opening and closing of the liquid inlet pipe 22, and the second valve is used for controlling the opening and closing of the air inlet pipe 23.
Preferably, the first valve and the second valve are both solenoid valves, and the solenoid valves can be controlled by a controller, so as to adjust the pressure of the air inlet pipe 23 and the flow rate of the liquid inlet pipe 22, and achieve the optimal proportioning effect.
Specific applications of the catalyst step loading method are exemplified below.
Example 1:
the catalyst sample 1 needs to be supplemented with active components uniformly and completely, and the concentration of the active components is 2%. The catalyst was 20-20 pores with a length of 100 cm.
The spray coating method used for catalyst sample 1 was:
combining and splicing 20-by-20 single spray guns 2 to form a spraying device 30, and hoisting the spraying device 30 by using a hoisting device 33;
the control device 32 controls the catalyst spraying device 30 to start;
the control device 32 sets the pressure of a gas pipeline to be 0.2Mpa, the flow of a clean water pipeline to be 0.98L/min and the concentration of the active component stock solution to be 0.02L/min;
inserting the spray gun 2 into the catalyst channel, controlling the release speed to be 0.01m/s by the control device 32, controlling the release distance to be 90cm, and slowly spraying the nozzle 1 from the outer end of the windward end of the catalyst along the inner wall of the channel from top to bottom;
when the release distance reaches the set distance of 90cm, the spraying is stopped, and the spraying device 30 is lifted upwards;
and repeating the processes to spray the next catalyst until all the catalysts are sprayed.
Example 2:
the catalyst sample 2 needs to be supplemented with active components layer by layer, the concentration of the active component 30cm in front of the windward end is 3%, the concentration of the active component 30cm in the middle is 2.5%, and the concentration of the active component 30cm behind the leeward end is 2%. The catalyst was 18 x 18 cells, 90cm in length.
Combining and splicing 18 or 18 single spray guns 2 to form a spraying device 30, and hoisting the spraying device 30 by using a hoisting device 33;
the control device 32 controls the catalyst spraying device 30 to start;
the control device 32 sets the active component concentration control segment mode:
the windward end: the pressure of a gas pipeline is 0.2Mpa, the flow of a clean water pipeline is set to be 0.97L/min, the concentration of an active component stock solution is set to be 0.03L/min, and the release distance is 30 cm.
The middle end: the pressure of a gas pipeline is 0.2Mpa, the flow of a clean water pipeline is set to be 0.975L/min, the concentration of an active component stock solution is set to be 0.025L/min, and the release distance is 30 cm.
A leeward end: the pressure of the gas pipeline is 0.2Mpa, the flow of the clean water pipeline is set to be 0.98L/min, the concentration of the active component stock solution is set to be 0.02L/min, and the release distance is 30cm
The spray gun 2 was inserted into the catalyst hole passage, and the control device 32 controlled the release rate at 0.01m/s, and the spray was slowly applied from the top and bottom, with the concentration being 3% of the set value.
When the release distance reaches 30cm, the ratio of the medicament is automatically changed, and the concentration is changed to 2.5%.
When the release distance reaches 60cm, the ratio of the medicament is automatically changed, and the concentration is changed to 2%.
When the release distance reaches 90cm, the spraying is stopped, and the spraying device 30 is lifted upwards;
and repeating the processes to spray the next catalyst until all the catalysts are sprayed.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the 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, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the second feature or the first and second features may be indirectly contacting each other through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" and the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A method for loading a catalyst in a step, comprising:
Providing a spraying device, wherein the spraying device is provided with a liquid inlet pipe, an air inlet pipe, a liquid inlet, an air inlet and a spraying port, active component solution is introduced into the liquid inlet through the liquid inlet pipe, and compressed gas is introduced into the air inlet through the air inlet pipe;
providing a control device, and adjusting the pressure of the air inlet pipe, the flow of the liquid inlet pipe and the concentration of the active component solution by using the control device;
placing one end of the spraying device into a pore channel of a catalyst, mixing the compressed gas and the active component solution in the spraying device to form an active component gas-liquid mixture, spraying the active component gas-liquid mixture on the inner wall of the pore channel by using the spraying device, and controlling the spraying device to move along the inner wall of the pore channel according to a preset direction and a preset speed by using the control device;
and when the spraying device moves to the preset position, stopping spraying.
2. The method for carrying a catalyst in a stepped manner according to claim 1, wherein the control device adjusts the pressure of the gas inlet pipe, the flow rate of the liquid inlet pipe and the concentration of the active component solution according to the loss of the active component of the catalyst during the spraying of the active component gas-liquid mixture onto the inner wall of the pore passage by the spraying device.
3. The method for the step loading of catalyst as recited in claim 1, wherein the spray coating device comprises a plurality of spray guns, the spray guns comprise spray nozzles and spray gun tubes, the spray nozzles comprise nozzle bodies, the nozzle bodies have the liquid inlet, the air inlet and the spray outlet, the first ends of the spray gun tubes are connected with the nozzle bodies, the spray gun tubes are provided with the liquid inlet tubes and the air inlet tubes, the liquid inlet tubes are communicated with the liquid inlet, and the air inlet tubes are communicated with the air inlet.
4. The method for the step loading of the catalyst as recited in claim 3, wherein the cross-sectional area of the liquid inlet is larger than that of the gas inlet, the nozzle body has a mixing chamber therein, the liquid inlet is communicated with the mixing chamber through a liquid inlet channel, the gas inlet is communicated with the mixing chamber through a gas inlet channel, and the ejection port is communicated with the mixing chamber for ejecting the gas-liquid mixture in the mixing chamber.
5. The method for loading the catalyst in the step as recited in claim 3, wherein the liquid inlet is one, the air inlet is a plurality of air inlets, the axis of the liquid inlet and the axis of the nozzle body are collinear, and the plurality of air inlets are arranged at intervals along the circumferential direction of the liquid inlet.
6. The method as claimed in claim 4, wherein the mixing chamber comprises a first chamber and a second chamber arranged in sequence in the direction from the liquid inlet to the spray outlet, the first chamber is communicated with the second chamber, the liquid inlet channel extends into the second chamber, the cross-sectional area of the first chamber is kept constant in the direction from the liquid inlet to the spray outlet, and the cross-sectional area of the second chamber is gradually reduced.
7. The method of claim 3, wherein the outlet port has an umbrella shape, and the liquid inlet has a cross-sectional area that gradually increases toward the outlet port.
8. The catalyst step supporting method according to claim 3, further comprising a plurality of connecting columns, one ends of the connecting columns being connected to the nozzle body and the other ends of the connecting columns being connected to the ejection ports, the plurality of connecting columns being arranged at intervals in a circumferential direction of the ejection ports.
9. The method for supporting a catalyst in a step according to claim 3, wherein the nozzle body comprises a first section and a second section which are arranged in sequence in a direction from the liquid inlet to the spray outlet, and the cross-sectional area of the first section is smaller than that of the second section.
10. The method for carrying the catalyst in the step manner according to claim 3, wherein the spray gun further comprises a mounting seat, a first valve and a second valve, the mounting seat is arranged at the second end of the spray gun pipe, the first valve and the second valve are both arranged on the mounting seat, the first valve is used for controlling the on-off of the liquid inlet pipe, and the second valve is used for controlling the on-off of the gas inlet pipe.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102085452A (en) * | 2010-11-29 | 2011-06-08 | 中国环境科学研究院 | Reducing agent atomization spray gun for selective non-catalytic reduction denitration process |
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| CN110142160A (en) * | 2019-05-15 | 2019-08-20 | 厦门理工学院 | A kind of array dry ice spray head and gas-solid mixture production method |
| CN215030371U (en) * | 2021-01-15 | 2021-12-07 | 中国科学院大连化学物理研究所 | Spraying device for fuel cell catalyst layer |
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| CN102085452A (en) * | 2010-11-29 | 2011-06-08 | 中国环境科学研究院 | Reducing agent atomization spray gun for selective non-catalytic reduction denitration process |
| DE102011100017A1 (en) * | 2011-04-29 | 2012-10-31 | Süd-Chemie AG | Process for the preparation of zoned catalysts |
| CN202823144U (en) * | 2012-07-30 | 2013-03-27 | 浙江天蓝环保技术股份有限公司 | Spray gun used for selective non-catalytic reduction (SNCR) and SNCR-selective catalytic reduction (SCR) denitration |
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| CN205461766U (en) * | 2016-03-30 | 2016-08-17 | 河北卓然化工设备科技有限公司 | A gas -liquid mixture injection system for deNOx systems |
| CN207823912U (en) * | 2018-02-07 | 2018-09-07 | 上海胜桀精密机械科技有限公司 | A kind of spray equipment for die casting machine |
| CN208295928U (en) * | 2018-03-07 | 2018-12-28 | 浙江环立环保科技有限公司 | A kind of spray gun |
| CN110142160A (en) * | 2019-05-15 | 2019-08-20 | 厦门理工学院 | A kind of array dry ice spray head and gas-solid mixture production method |
| CN215030371U (en) * | 2021-01-15 | 2021-12-07 | 中国科学院大连化学物理研究所 | Spraying device for fuel cell catalyst layer |
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| CN114669424B (en) | 2023-05-12 |
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