CN113181975B - Self-fluid-supplementing balanced denitration catalyst end hardening device and hardening process - Google Patents
Self-fluid-supplementing balanced denitration catalyst end hardening device and hardening process Download PDFInfo
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- CN113181975B CN113181975B CN202110464568.9A CN202110464568A CN113181975B CN 113181975 B CN113181975 B CN 113181975B CN 202110464568 A CN202110464568 A CN 202110464568A CN 113181975 B CN113181975 B CN 113181975B
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Abstract
The invention discloses a self-fluid-supplementing balanced denitration catalyst end hardening device and a hardening process, belongs to the technical field of denitration catalysts, and solves the problems that a hardening device in the prior art cannot timely and quantitatively supplement hardening fluid, concentration of the hardening fluid is unbalanced and hardening efficiency is low. According to the invention, the automatic grabbing mechanism is arranged, the denitration catalyst is synchronously immersed by utilizing the grabbing components, so that the immersing efficiency of the denitration catalyst is improved, the quantitative fluid supplementing component is arranged to timely supplement the hardening fluid, the supplementing quantity of the hardening fluid is accurately changed, the concentration of the hardening fluid is balanced, the hardening quality of the denitration catalyst is ensured to be uniform, the hardening quality of the denitration catalyst is improved, the denitration catalyst fragments in the hardening fluid are adsorbed through the pores of the molecular sieve and the chitosan, and the purity of the hardening fluid is ensured.
Description
Technical Field
The invention belongs to the technical field of denitration catalysts, and particularly relates to a self-fluid-supplementing balanced denitration catalyst end hardening device and hardening process.
Background
At present, 70% of nitrogen oxide emission in China comes from combustion of coal, and in the technical field of NOx treatment, the selective catalytic reduction method has the advantages of no byproducts, simple system device, high denitration efficiency, reliable operation, convenient maintenance and the like, and is applied in a large area. The basic principle of SCR is that NH is used 3 As a reducing agent, selectively reduces NOx to N under the action of a catalyst 2 . At present, the catalyst with the highest market share is a honeycomb catalyst, because of the requirement of catalyst activity, most of SCR devices are arranged in front of an electric dust collector, fly ash particles rapidly impact the catalyst when flue gas passes through an airflow channel of the catalyst, abrasion and dust generation are easy to occur, particularly abrasion at the top end is most prominent, the catalyst is damaged and broken, the service life of the catalyst is greatly reduced, the catalyst pore canal is blocked, difficulty is brought to the fixation of a catalyst monomer, and a series of subsequent problems are caused. Therefore, it is necessary to design an end hardening device and hardening process that ensure the end hardening efficiency and quality of the denitration catalyst.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, and provides a self-fluid-supplementing balanced denitration catalyst end hardening device and hardening process which can timely and quantitatively supplement hardening fluid, keep the concentration balance of the hardening fluid and have high hardening efficiency.
In order to achieve the technical purpose, the self-fluid-supplementing balanced denitration catalyst end hardening device and the hardening process adopt the following technical scheme:
the self-fluid-supplementing balance type denitration catalyst end hardening device comprises an impregnating tank, wherein an automatic grabbing mechanism which is convenient for impregnating the denitration catalyst is arranged above the impregnating tank, and an automatic fluid-supplementing balance mechanism is also arranged in the impregnating tank;
the automatic grabbing mechanism comprises an installation seat, two ends of the installation seat are erected above the dipping tank, two sides of the installation seat are provided with outwards extending sliding rails, the surface of the sliding rails is in sliding connection with a sliding plate perpendicular to the sliding rails, the surface of the sliding plate is fixedly connected with a discharge plate which is transversely arranged through bolts, a plurality of grabbing components are uniformly distributed on the surface of the discharge plate, the grabbing components comprise a plurality of clamping grooves which are integrally connected in a ring-shaped mode, the large-diameter end of each clamping groove is provided with a notch matched with the appearance of a denitration catalyst, the inner wall of the small-diameter end of each clamping groove is provided with a bayonet, the bayonets are respectively clamped with polygonal rotary wheels, the middle parts of the rotary wheels are provided with spindles controlled by the rotary seats, the upper parts of the rotary seats are provided with first telescopic cylinders for controlling the lifting of the rotary wheels, and the rotary seats are driven by a first miniature motor arranged at the top of the discharge plate;
the automatic fluid replacement balance mechanism comprises a monitoring component for monitoring the volume change of hardening fluid in the dipping tank, a switch component electrically connected with the monitoring component and a quantitative fluid replacement component, wherein the monitoring component comprises a floating ball arranged in the dipping tank, the floating ball floats up and down according to the height of the liquid level in the dipping tank, the surface of the floating ball is fixedly connected with a connecting rod which is obliquely arranged, the connecting rod penetrates through the rear end part of a positioning plate arranged at the upper part of the dipping tank to be matched with a button switch plate, the bottom of the button switch plate is connected with the side wall of the dipping tank, and a button switch I and a button switch II are arranged at the upper end and the lower end of the surface of the button switch I in parallel;
the switch assembly comprises an electromagnet, an attracting ring matched with the electromagnet and a telescopic spring arranged between the electromagnet and the attracting ring, wherein the electromagnet is electrically connected with the button switch board, the attracting ring is arranged in the sliding block, a groove for accommodating the attracting ring is formed in the surface of the sliding block, a barb extending out of the telescopic spring towards the outside through the attracting ring is arranged in the middle of the groove, the lower part of the barb penetrates through the rear end part of the sliding block to be communicated with the sliding block, and the sliding block is connected in the positioning frame in a sliding manner;
the quantitative fluid infusion assembly comprises a buffer tank with the bottom fixedly connected with an electromagnet, a one-way valve with a port corresponding to a barb is arranged at the bottom of the buffer tank, a first pipeline and a second pipeline are respectively arranged at the inlet end of the buffer tank, the other end of the first pipeline is connected with a high-concentration aluminum sulfate tank, a first metering pump for controlling the output quantity of aluminum sulfate is arranged on the first pipeline, the other end of the second pipeline is connected with a pure water tank, a second metering pump for controlling the output quantity of pure water is arranged on the second pipeline, the first metering pump and the second metering pump are controlled by a control box, and the control box is electrically connected with a specific gravity meter for detecting the specific gravity of hardening fluid;
the front end of the dipping tank is provided with a presoaking tank which is convenient for the denitration catalyst to adhere to gel base solution, an adsorption roller which adsorbs denitration catalyst fragments is arranged in the presoaking tank, and the adsorption roller is driven by a second micro motor which is arranged on the outer wall of the dipping tank.
Preferably, the tail end of the discharging plate is provided with a connecting lug which is in conflict with the second telescopic cylinder, and the bottom of the second telescopic cylinder is provided with a steering seat which can drive the second telescopic cylinder to freely rotate.
Preferably, a telescopic rod sleeved with the bottom of the second telescopic cylinder is arranged in the middle of the steering seat, and drives the second telescopic cylinder to move up and down.
Preferably, the surface of the connecting rod and the surface of the positioning plate are provided with scales, and the middle part of the positioning plate is provided with an opening for the connecting rod to move up and down.
Preferably, the locating rack is fixedly connected with the bottom of the buffer tank, and the upper end of the locating rack is provided with a sliding cylinder for the sliding block to slide freely up and down.
Preferably, the length of the barb is larger than the sum of the heights of the valve body of the one-way valve, the electromagnet and the suction ring and smaller than the sum of the maximum expansion modulus of the telescopic spring and the height of the suction ring.
Preferably, one end of the densimeter is provided with a sampling tube inserted into the middle of the dipping tank, and the sampling tube samples the hardening liquid so as to conveniently detect the specific gravity.
Preferably, a freeze drying mechanism is further arranged on one side of the dipping tank, the freeze drying mechanism comprises a freeze drying box and a muffle furnace which are sequentially connected through guide rails, an air drying conveyer belt which is convenient for drying the dipped denitration catalyst is arranged between the freeze drying box and the dipping tank, and the air drying conveyer belt drives the discharge plate to convey to the freeze drying box.
A self-fluid-supplementing balanced denitration catalyst end hardening process comprises the following steps:
(1) Preparing gel base solution, hardening solution A and hardening solution B according to the weight parts, and putting the gel base solution into a pre-soaking tank, and putting the hardening solution A or the hardening solution B into a soaking tank;
(2) Starting a second telescopic cylinder, pushing a discharge plate to move above a pre-soaking pool along the horizontal direction, starting a first telescopic cylinder, enabling a plurality of grabbing components to move downwards, vertically immersing a denitration catalyst in a notch of a clamping groove in the pre-soaking pool, immersing and coating for 5min, starting a rotating wheel, clamping corners of the rotating wheel into a bayonet, rotating the clamping groove along with the bayonet to sequentially carry out immersing and coating, reversely starting the first telescopic cylinder, enabling the plurality of grabbing components to move upwards, reversely starting the second telescopic cylinder, moving the discharge plate to the position above the soaking pool, starting the first telescopic cylinder, enabling the plurality of grabbing components to move downwards, vertically immersing the denitration catalyst in the notch of the clamping groove in the soaking pool, wherein the immersing height is 3-5 cm, and the immersing time is 40-60 s;
(3) Naturally air-drying the impregnated denitration catalyst to prepare the denitration catalyst with hardened end parts;
(4) The hardening liquid in the dipping tank is subjected to dynamic measurement on relative density by a specific gravity meter, the detection result is transmitted to a first metering pump or a second metering pump after calculation, the metering pump quantitatively transmits high-concentration aluminum sulfate solution to a buffer tank, or the second metering pump quantitatively transmits pure water to the buffer tank, or the first metering pump and the second metering pump quantitatively transmit aluminum sulfate solution and pure water to the buffer tank at the same time;
(5) The floating ball in the dipping tank slides downwards along with the liquid level of the hardening liquid, the first button switch is touched after the connecting rod deflects upwards, the electromagnet is attracted with the attraction ring after being connected, the sliding block moves upwards along the sliding cylinder, barbs in the middle part of the sliding block penetrate into the one-way valve, the supplementing liquid in the buffer tank flows into the dipping tank along the barbs, the adsorption roller is driven to rotate around the shaft by the second micro motor, the denitration catalyst scraps in the dipping tank are adsorbed and stirred at the same time after the mixed hardening liquid, the hardening liquid in the dipping tank keeps the initial concentration for reuse, after the supplementing liquid in the buffer tank is supplemented, the floating ball moves upwards along with the liquid level of the hardening liquid, the second button switch is touched after the connecting rod deflects downwards, the electromagnet is disconnected, the attraction ring falls down, and the sliding block slides to the bottom of the sliding cylinder, and the barbs are separated from the one-way valve.
Preferably, the preparation method of the gel base solution in the step (1) comprises the following steps: 1) Adding proper amount of water into 100 parts of bentonite, adjusting the pH to 4-5, and stirring for 0.5h to obtain bentonite slurry; 2) Adding 20-35 parts of chitosan and 1.5-3.5 parts of glutaraldehyde into bentonite slurry, and stirring for 0.5h at normal temperature to prepare mixed slurry; 3) Injecting the mixed slurry into dilute alkali solution to gel for 10-12 h, and obtaining the chitosan-bentonite composite gel.
Preferably, the preparation method of the hardening liquid in the step (1) includes the following steps: 1) Putting 118 parts of water into a preparation kettle in parts by weight, and heating to 80 ℃; 2) Adding 100 parts of aluminum sulfate into the preparation kettle, and stirring for 2 hours at constant temperature to obtain a hardening liquid A; 3) 140 parts of 85% phosphoric acid, 36 parts of aluminum hydroxide and 85 parts of water are put into a preparation kettle, the temperature is raised to 75-90 ℃, and the mixture is stirred for 2 hours, so as to prepare hardening liquid B.
Preferably, the preparation method of the adsorption roller in the step (6) comprises the following steps: 1) According to the weight portion, 20 to 35 portions of chitosan is dissolved in acetic acid solution with the volume fraction of 0.8 percent to 1.2 percent to prepare chitosan-acetic acid solution; 2) Adding 100 parts of molecular sieve into the chitosan-acetic acid solution in the step 1), stirring and soaking for 8-12 h, filtering, washing with water, and drying at 60-80 ℃ to obtain chitosan-molecular sieve particles; 3) The following steps are carried out: preparing aluminum powder, alloy elements and chitosan-molecular sieve particles according to the weight ratio of 12:30, filling the mixed powder into a mold, cold-pressing at room temperature for molding, and demolding to obtain an adsorption roller blank; 4) And placing the blank body in a hot-press shaping die for press shaping and machining to obtain the adsorption roller.
Preferably, the denitration catalyst immersed in the step (3) is conveyed to a freeze drying box for freeze drying through an air drying conveying belt, the denitration catalyst after freeze drying is conveyed to a muffle furnace for calcination at 300-500 ℃ for 0.5-1 h, and the denitration catalyst with hardened end parts is prepared.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the automatic grabbing mechanism is arranged in the end hardening device, the denitration catalyst is synchronously immersed by utilizing the grabbing components, so that the immersing efficiency of the denitration catalyst is improved, meanwhile, the clamping grooves are controlled to rotate by utilizing the rotating wheels, so that the denitration catalyst in the clamping grooves which are integrally arranged is sequentially immersed, and the treatment capacity of the denitration catalyst is improved in unit time;
2. according to the invention, the change condition of the liquid level of the hardening liquid is monitored in real time by utilizing the monitoring component in the automatic liquid supplementing balance mechanism, the quantitative liquid supplementing component is automatically opened or closed according to the actual dipping condition by combining the switch component, the sensitivity of hardening liquid supplementing is improved, the hardening liquid supplementing quantity is accurately realized by arranging the quantitative liquid supplementing component to timely supplement the hardening liquid, and the hardening liquid concentration is balanced, so that the hardening quality of the denitration catalyst is ensured to be kept uniform, and the hardening quality of the denitration catalyst is improved;
3. according to the invention, the chitosan-bentonite composite hydrogel is impregnated before the hardening liquid is impregnated, the cation exchange property of bentonite is utilized, so that cations in the hardening liquid are quickly attached to the surface of the denitration catalyst, the hardening efficiency and the hardening quality of the denitration catalyst are improved, meanwhile, the adsorption roller is arranged in the impregnating tank, and the pores of the molecular sieve and the chitosan are utilized to adsorb the chips of the denitration catalyst in the hardening liquid, so that the purity of the hardening liquid is ensured, the chips are prevented from adhering to the surface of the denitration catalyst, the contact area between the denitration catalyst and the hardening liquid is reduced, and the hardening effect of the denitration catalyst is reduced.
Drawings
FIG. 1 is a schematic view of a first embodiment of the present invention;
FIG. 2 is an enlarged view of the structure of the portion A according to the first embodiment of the present invention;
FIG. 3 is an enlarged view of a portion B according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an automatic fluid infusion balancing mechanism according to a first embodiment of the present invention;
FIG. 5 is a schematic view showing a grabbing assembly according to a first embodiment of the present invention;
FIG. 6 is a schematic diagram of a second embodiment of the present invention;
fig. 7 is a schematic structural diagram of a quantitative fluid infusion assembly in accordance with a third embodiment of the present invention.
In the figure: 1. an impregnation tank; 2. a mounting base; 3. a slide rail; 4. a slide plate; 5. a discharge plate; 6. a clamping groove; 7. a notch; 8. a bayonet; 9. a rotating wheel; 10. a rotating seat; 11. a first telescopic cylinder; 12. a first micro motor; 13. a floating ball; 14. a connecting rod; 15. a positioning plate; 16. a push button switch board; 17. a first button switch; 18. a second button switch; 19. an electromagnet; 20. a suction ring; 21. a telescopic spring; 22. a slide block; 23. a groove; 24. a barb; 25. a positioning frame; 26. a buffer tank; 27. a one-way valve; 28. a first pipeline; 29. a second pipeline; 30. an aluminum sulfate tank; 31. a metering pump I; 32. a pure water tank; 33. a metering pump II; 34. a control box; 35. a specific gravity meter; 36. presoaking the pool; 37. an adsorption roller; 38. a second micro motor; 39. the second telescopic cylinder; 40. a connecting lug; 41. a steering seat; 42. a telescopic rod; 43. a slide cylinder; 44. a freeze drying oven; 45. a muffle furnace; 46. and (5) air-drying the conveyer belt.
Detailed Description
The invention is further described below with reference to the drawings and detailed description:
embodiment one:
as shown in fig. 1-5, the self-fluid-supplementing balance type denitration catalyst end hardening device comprises an impregnating tank 1, wherein an automatic grabbing mechanism which is convenient for impregnating the denitration catalyst is arranged above the impregnating tank 1, and an automatic fluid-supplementing balance mechanism is also arranged in the impregnating tank 1;
the automatic grabbing mechanism comprises an installation seat 2, two ends of the installation seat are erected above an immersion tank 1, two sides of the installation seat 2 are provided with outwards extending sliding rails 3, the surface of the sliding rails 3 is in sliding connection with a sliding plate 4 perpendicular to the sliding rails 3, the surface of the sliding plate 4 is fixedly connected with a discharge plate 5 which is arranged along the transverse direction through bolts, a plurality of grabbing components are uniformly distributed on the surface of the discharge plate 5, each grabbing component comprises a plurality of clamping grooves 6 which are sequentially connected and integrally and annularly distributed, the large-diameter end of each clamping groove 6 is provided with a notch 7 matched with the appearance of a denitration catalyst, the inner wall of the small-diameter end is provided with a bayonet 8, the bayonets 8 are respectively clamped with a polygonal rotary wheel 9, the middle parts of the rotary wheels 9 are provided with a main shaft controlled by a rotary seat 10, the upper part of the rotary seat 10 is provided with a first telescopic cylinder 11 which controls the lifting of the rotary seat 10, and the rotary seat 10 is driven by a first micro motor 12 arranged at the top of the discharge plate 5; a plurality of grabbing components below the discharging plate 5 are used for synchronously immersing a plurality of denitration catalysts, so that the immersing efficiency of the denitration catalysts is improved, and a single grabbing component sequentially clamps the bayonet 8 by using the rotating wheel 9, so that the denitration catalysts in the plurality of clamping grooves 6 are sequentially immersed in hardening liquid, and the unit denitration catalyst treatment capacity is improved;
the automatic fluid infusion balancing mechanism comprises a monitoring component for monitoring the volume change of hardening fluid in the dipping tank 1, a switch component electrically connected with the monitoring component and a quantitative fluid infusion component, wherein the monitoring component comprises a floating ball 13 arranged in the dipping tank 1, the floating ball 13 floats up and down according to the height of the liquid level in the dipping tank 1, the surface of the floating ball 13 is fixedly connected with a connecting rod 14 which is obliquely arranged, the connecting rod 14 penetrates through the rear end part of a positioning plate 15 arranged at the upper part of the dipping tank 1 and is matched with a button switch plate 16, scales are arranged on the surface of the connecting rod 14 and the surface of the positioning plate 15, an opening for the connecting rod 14 to move up and down is formed in the middle of the positioning plate 15, the bottom of the button switch plate 16 is connected with the side wall of the dipping tank 1, and a button switch I17 and a button switch II 18 are arranged at the upper end and the lower end of the surface of the floating ball is parallel; the floating ball 13 is used for controlling the upward movement or the downward movement of the connecting rod 14, so that the automatic selection connection with a button switch is realized, and the automation and the sensitivity of fluid replacement are improved;
the switch assembly comprises an electromagnet 19, an attracting ring 20 matched with the electromagnet 19 and a telescopic spring 21 arranged between the electromagnet 19 and the attracting ring 20, wherein the electromagnet 19 is electrically connected with a button switch board 16, the attracting ring 20 is arranged in a sliding block 22, a groove 23 for accommodating the attracting ring 20 is formed in the surface of the sliding block 22, a barb 24 penetrating through the attracting ring 20 and extending out of the telescopic spring 21 is formed in the middle of the groove 23, the lower part of the barb 24 penetrates through the rear end part of the sliding block 22 and is communicated with the sliding block 22, and the sliding block 22 is slidably connected in a positioning frame 25; through the attraction and separation of the electromagnet 19 and the attraction ring 20, the upward movement and the downward falling of the barb 24 in the sliding block 22 are controlled, the communication and the separation of the barb 24 and the buffer groove 26 are effectively controlled, and the buffer groove 26 is dynamically opened and closed according to the change of the liquid level of the hardening liquid;
the quantitative fluid infusion assembly comprises a buffer tank 26, the bottom of the buffer tank 26 is fixedly connected with an electromagnet 19, a one-way valve 27 with a port corresponding to a barb 24 is arranged at the bottom of the buffer tank 26, a first pipeline 28 and a second pipeline 29 are respectively arranged at the inlet end of the buffer tank 26, the other end of the first pipeline 28 is connected with a high-concentration aluminum sulfate tank 30, a first metering pump 31 for controlling the output quantity of aluminum sulfate is arranged on the first pipeline 28, the other end of the second pipeline 29 is connected with a pure water tank 32, a second metering pump 33 for controlling the output quantity of pure water is arranged on the second pipeline 29, the first metering pump 31 and the second metering pump 33 are controlled by a control box 34, the control box 34 is electrically connected with a specific gravity meter 35 for detecting the specific gravity of the hardening fluid, one end of the specific gravity meter 35 is provided with a sampling tube inserted into the middle part of the dipping tank 1, and the sampling tube is used for sampling the hardening fluid so as to conveniently detect the specific gravity;
the front end of the dipping tank 1 is provided with a presoaking tank 36 which is convenient for the denitration catalyst to adhere to gel base solution, an adsorption roller 37 which adsorbs denitration catalyst fragments is arranged in the presoaking tank, and the adsorption roller 37 is driven by a second micro motor 38 which is arranged on the outer wall of the dipping tank 36.
According to the method, the change of the hardening liquid density in the impregnation tank is measured by the specific gravity meter 35, the change condition of the hardening liquid level measured in the monitoring assembly is combined, the supplementing quantity of the hardening liquid supplementing element is rapidly calculated, the problem that the concentration is different before and after the solution is caused by the fact that the conventional automatic supplementing liquid is used for simply supplementing the liquid quantity, the hardening quality of the end part of the denitration catalyst is affected is avoided, the problem that the solution density is kept by the specific gravity meter only, the solution volume is not limited, and the impregnation depth of the denitration catalyst is different is also avoided.
The tail end of the discharging plate 5 is provided with a connecting lug 40 which is in contact with the second telescopic cylinder 39, the bottom of the second telescopic cylinder 39 is provided with a steering seat 41 which can drive the second telescopic cylinder 39 to rotate freely, the middle part of the steering seat 41 is provided with a telescopic rod 42 which is sleeved with the bottom of the second telescopic cylinder 39, and the telescopic rod 42 drives the second telescopic cylinder 39 to move up and down. The second telescopic cylinder 39 is used for controlling the forward and backward movement of the discharge plate 5, and the forward direction of the second telescopic cylinder 39 is regulated by the telescopic action of the telescopic rod 42.
The locating rack 25 is fixedly connected with the bottom of the buffer groove 26, and a sliding cylinder 43 for the sliding block 22 to slide up and down freely is arranged at the upper end of the locating rack 25. The slide block 22 is fixed in the slide cylinder 43, so that the stroke of the slide block is controlled and corresponds to the check valve 27 accurately, and the liquid in the buffer tank 26 can flow into the dipping tank 1 smoothly. Wherein the slide cylinder 43 is fixed on the inner wall of the dipping tank 1 through a roll-over stand.
The length of the barb 24 is larger than the sum of the heights of the valve body of the one-way valve 27, the electromagnet 19 and the suction ring 20 and smaller than the sum of the maximum extension modulus of the telescopic spring 21 and the height of the suction ring 20. By setting the length of the barb 24, the barb can accurately penetrate into the check valve 27, and meanwhile, the barb can be quickly separated from the control of the check valve 27, so that the check valve 27 can be quickly opened and closed.
A self-fluid-supplementing balanced denitration catalyst end hardening process comprises the following steps:
(1) Preparing gel base solution and hardening solution A according to the weight portion ratio respectively, and putting the gel base solution into a pre-soaking tank, putting the hardening solution A into a soaking tank, wherein the preparation method of the gel base solution comprises the following steps: 1) Adding proper amount of water into 100 parts of bentonite, adjusting the pH to 4-5, and stirring for 0.5h to obtain bentonite slurry; 2) Adding 20-35 parts of chitosan and 1.5-3.5 parts of glutaraldehyde into bentonite slurry, and stirring for 0.5h at normal temperature to prepare mixed slurry; 3) Injecting the mixed slurry into dilute alkali solution to gel for 10-12 h to prepare chitosan-bentonite composite gel, wherein the preparation method of the hardening liquid comprises the following steps: 1) Putting 118 parts of water into a preparation kettle in parts by weight, and heating to 80 ℃; 2) Adding 100 parts of aluminum sulfate into the preparation kettle, and stirring for 2 hours at constant temperature to obtain a hardening liquid A;
(2) Starting a second telescopic cylinder, pushing a discharge plate to move above a pre-soaking pool along the horizontal direction, starting a first telescopic cylinder, enabling a plurality of grabbing components to move downwards, vertically immersing a denitration catalyst in a notch of a clamping groove in the pre-soaking pool, immersing and coating for 5min, starting a rotating wheel, clamping corners of the rotating wheel into a bayonet, rotating the clamping groove along with the bayonet to sequentially carry out immersing and coating, reversely starting the first telescopic cylinder, enabling the plurality of grabbing components to move upwards, reversely starting the second telescopic cylinder, moving the discharge plate to the position above the soaking pool, starting the first telescopic cylinder, enabling the plurality of grabbing components to move downwards, vertically immersing the denitration catalyst in the notch of the clamping groove in the soaking pool, wherein the immersing height is 3-5 cm, and the immersing time is 40-60 s;
(3) Naturally air-drying the impregnated denitration catalyst to prepare the denitration catalyst with hardened end parts;
(4) The hardening liquid in the dipping tank is subjected to dynamic measurement on relative density by a specific gravity meter, the detection result is transmitted to a first metering pump or a second metering pump after calculation, the metering pump quantitatively transmits high-concentration aluminum sulfate solution to a buffer tank, or the second metering pump quantitatively transmits pure water to the buffer tank, or the first metering pump and the second metering pump quantitatively transmit aluminum sulfate solution and pure water to the buffer tank at the same time;
(5) The method comprises the following steps that a floating ball in an impregnating tank slides downwards along with the liquid level of hardening liquid, a first button switch is triggered after a connecting rod deflects upwards, an electromagnet is connected and then is attracted with an attracting ring, a sliding block moves upwards along a sliding cylinder, barbs in the middle of the sliding block penetrate into a one-way valve, supplementing liquid in a buffer tank flows into the impregnating tank along the barbs, an adsorption roller is driven to rotate around a shaft through a second micro motor, denitration catalyst fragments in the impregnating tank are adsorbed and stirred after the mixed hardening liquid, the hardening liquid in the impregnating tank keeps initial concentration for reuse, after supplementing the supplementing liquid in the buffer tank is completed, the floating ball moves upwards along with the liquid level of the hardening liquid, a second button switch is triggered after the connecting rod deflects downwards, the electromagnet is disconnected, the attracting ring falls down, the sliding block slides to the bottom of the sliding cylinder, and the barbs are separated from the one-way valve, and the preparation method of the adsorption roller comprises the following steps: 1) According to the weight portion, 20 to 35 portions of chitosan is dissolved in acetic acid solution with the volume fraction of 0.8 percent to 1.2 percent to prepare chitosan-acetic acid solution; 2) Adding 100 parts of molecular sieve into the chitosan-acetic acid solution in the step 1), stirring and soaking for 8-12 h, filtering, washing with water, and drying at 60-80 ℃ to obtain chitosan-molecular sieve particles; 3) The following steps are carried out: preparing aluminum powder, alloy elements and chitosan-molecular sieve particles according to the weight ratio of 12:30, filling the mixed powder into a mold, cold-pressing at room temperature for molding, and demolding to obtain an adsorption roller blank; 4) And placing the blank body in a hot-press shaping die for press shaping and machining to obtain the adsorption roller. Wherein the alloy elements are conventional alloy elements such as aluminum, copper, manganese and the like, so that the overall rigidity is improved.
In the invention, a PLC controller is arranged in the control box 34, and the PLC controller substitutes measured values such as specific gravity of the hardening liquid, liquid level height of the hardening liquid, change height of the connecting rod and the like into a liquid compensation amount calculation formula to calculate liquid compensation amount. When the impregnating tank is filled with hardening liquid A, gamma 0 Greater than gamma 1 The aluminum sulfate make-up is obtained from the following formula: v (V) Aluminum sulfate ＝(γ 0 V 0 －γ 1 V 1 )/γ Aluminum sulfate Wherein gamma is 0 V 0 Gamma, the initial specific gravity and initial volume of the hardening liquid 1 V 1 Gamma, the specific gravity and the volume of the hardened denitration catalyst are the hardening liquid Aluminum sulfate The specific gravity of the aluminum sulfate replenishing solution. Gamma ray 0 Less than gamma 1 The pure water replenishment amount was obtained by the following formula: v pure water= (γ) 1 －γ 0 )V 1 /γ 0 Wherein gamma is 1 V 1 Gamma, the specific gravity and the volume of the hardened denitration catalyst are the hardening liquid 0 The initial specific gravity of the hardening liquid.
According to the invention, the chitosan-bentonite composite hydrogel is impregnated before the hardening liquid is impregnated, the cation exchange property of bentonite is utilized, so that cations in the hardening liquid are quickly attached to the surface of the denitration catalyst, the hardening efficiency and the hardening quality of the denitration catalyst are improved, meanwhile, the adsorption roller is arranged in the impregnating tank, and the pores of the molecular sieve and the chitosan are utilized to adsorb the chips of the denitration catalyst in the hardening liquid, so that the purity of the hardening liquid is ensured, the chips are prevented from adhering to the surface of the denitration catalyst, the contact area between the denitration catalyst and the hardening liquid is reduced, and the hardening effect of the denitration catalyst is reduced.
Embodiment two:
as shown in fig. 6, unlike the first embodiment, the dipping tank 1 is further provided with a freeze-drying mechanism, the freeze-drying mechanism includes a freeze-drying box 44 and a muffle 45 sequentially connected via guide rails, an air-drying conveyor belt 46 for facilitating air drying of the post-dipping denitration catalyst is disposed between the freeze-drying box 44 and the dipping tank 1, and the air-drying conveyor belt 46 drives the discharge plate 5 to convey to the freeze-drying box 44.
In this embodiment, unlike the end hardening process of the denitration catalyst in the first embodiment, the denitration catalyst impregnated in the step (3) is transported to a freeze drying box by an air drying conveyor belt for freeze drying, and the denitration catalyst after freeze drying is transported to a muffle furnace for calcination at 300-500 ℃ for 0.5-1 h, so as to obtain the denitration catalyst after end hardening.
In the embodiment, the denitration catalyst after end face hardening is changed from natural air drying into freeze drying and is heated and dried by a muffle furnace, so that not only is the drying efficiency of the denitration catalyst improved, but also the mechanical strength of the denitration catalyst is improved.
Embodiment III:
as shown in fig. 7, unlike the first embodiment, the hardening liquid B is charged into the dipping tank according to the present invention, and the preparation method of the hardening liquid B includes the steps of: 140 parts of 85% phosphoric acid, 36 parts of aluminum hydroxide and 85 parts of water are put into a preparation kettle, the temperature is raised to 75-90 ℃, and the mixture is stirred for 2 hours, so as to prepare hardening liquid B.
The buffer tank of the quantitative fluid infusion assembly is also connected with the phosphoric acid tank through a pipeline III, the pipeline I is connected with the aluminum hydroxide tank, and the pipeline II is connected with the pure water tank.
The aluminum hydroxide make-up amount is obtained from the following formula: gamma ray 0 Greater than gamma 1 The aluminum sulfate make-up is obtained from the following formula: v (V) Aluminum hydroxide ＝(γ 0 V 0 －γ 1 V 1 )/γ Aluminum hydroxide Wherein gamma is 0 V 0 Gamma, the initial specific gravity and initial volume of the hardening liquid 1 V 1 Gamma, the specific gravity and the volume of the hardened denitration catalyst are the hardening liquid Aluminum hydroxide The specific gravity of the aluminum hydroxide replenishing solution. Gamma ray 0 Less than gamma 1 The pure water replenishment amount was obtained from the following formula: v (V) Pure water ＝(γ 1 －γ 0 )V 1 /γ 0 Wherein gamma is 1 V 1 Gamma, the specific gravity and the volume of the hardened denitration catalyst are the hardening liquid 0 For the initial specific gravity of the hardening liquid, the phosphoric acid supplementing amount is obtained by the following formula: v (V) Phosphoric acid ＝(γ 1 －γ 0 )V 1 /(γ 0 —γ Phosphoric acid ) Wherein gamma is 1 V 1 Gamma, the specific gravity and the volume of the hardened denitration catalyst are the hardening liquid 0 For the initial specific gravity of the hardening liquid, gamma Phosphoric acid Is phosphoric acid specific gravity.
The hardening liquid B is put into the dipping tank, so that the denitration catalyst achieves hardening effects of different degrees according to different production requirements.
In summary, the present invention is not limited to the preferred embodiments, but includes all equivalent changes and modifications in shape, construction, characteristics and spirit according to the scope of the claims.
Claims (4)
1. The utility model provides a from balanced denitration catalyst end hardening device of fluid replacement, includes the flooding pond, its characterized in that: an automatic grabbing mechanism which is convenient for the denitration catalyst to be immersed is arranged above the immersing tank, and an automatic liquid supplementing balance mechanism is also arranged in the immersing tank;
the automatic grabbing mechanism comprises a mounting seat, two ends of the mounting seat are erected above the dipping tank, two sides of the mounting seat are provided with outwards extending sliding rails, the surface of the sliding rails is in sliding connection with a sliding plate which is perpendicular to the sliding rails, the surface of the sliding plate is fixedly connected with a discharging plate which is arranged along the transverse direction through bolts, the tail end of the discharging plate is provided with a connecting lug which is in contact with a second telescopic cylinder, the bottom of the second telescopic cylinder is provided with a steering seat which can drive the second telescopic cylinder to freely rotate, the middle of the steering seat is provided with a telescopic rod which is sleeved with the bottom of the second telescopic cylinder, the telescopic rod drives the second telescopic cylinder to move up and down, the surface of the discharging plate is uniformly provided with a plurality of grabbing components, the grabbing components comprise a plurality of clamping grooves which are sequentially connected into a whole and are distributed in an annular shape, the large-diameter end of the clamping grooves are provided with notches which are matched with the shape of a denitration catalyst, the inner wall of the small-diameter end is provided with bayonets, the bayonets are respectively clamped with polygonal rotary wheels, the middle of the rotary wheels is provided with a main shaft which is controlled by the rotary seat, the upper part of the rotary seat is provided with a first telescopic cylinder which is controlled to lift, and the rotary seat is uniformly arranged on the top of the first miniature motor which is arranged on the top of the rotary seat through a first miniature driving motor;
the automatic fluid replacement balance mechanism comprises a monitoring component for monitoring the volume change of hardening fluid in the dipping tank, a switch component electrically connected with the monitoring component and a quantitative fluid replacement component, wherein the monitoring component comprises a floating ball arranged in the dipping tank, the floating ball floats up and down according to the height of the fluid level in the dipping tank, the surface of the floating ball is fixedly connected with a connecting rod which is obliquely arranged, the connecting rod penetrates through the rear end part of a positioning plate arranged at the upper part of the dipping tank and is matched with a button switch plate, scales are arranged on the surface of the connecting rod and the surface of the positioning plate, an opening for the connecting rod to move up and down is formed in the middle of the positioning plate, the bottom of the button switch plate is connected with the side wall of the dipping tank, and a button switch I and a button switch II are arranged at the upper end and the lower end of the surface of the button switch plate in parallel;
the switch assembly comprises an electromagnet, an attracting ring matched with the electromagnet and a telescopic spring arranged between the electromagnet and the attracting ring, wherein the electromagnet is electrically connected with the button switch board, the attracting ring is arranged in a sliding block, a groove for accommodating the attracting ring is formed in the surface of the sliding block, a barb penetrating through the attracting ring and extending out of the telescopic spring is formed in the middle of the groove, the lower portion of the barb penetrates through the rear end of the sliding block and is communicated with the sliding block, the length of the barb is smaller than the sum of the maximum extension modulus of the telescopic spring and the height of the attracting ring, the sliding block is in sliding connection in a positioning frame, the positioning frame is fixedly connected with the bottom of a buffer tank, and a sliding cylinder for enabling the sliding block to slide up and down is arranged at the upper end of the positioning frame;
the quantitative fluid infusion assembly comprises a buffer tank with the bottom fixedly connected with an electromagnet, a one-way valve with a port corresponding to a barb is arranged at the bottom of the buffer tank, the length of the barb is larger than the sum of the heights of a valve body of the one-way valve, the electromagnet and a suction ring, a first pipeline and a second pipeline are respectively arranged at the inlet end of the buffer tank, the other end of the first pipeline is connected with a high-concentration aluminum sulfate tank, a first metering pump for controlling the output quantity of aluminum sulfate is arranged on the first pipeline, the other end of the second pipeline is connected with a pure water tank, a second metering pump for controlling the output quantity of pure water is arranged on the second pipeline, the first metering pump and the second metering pump are controlled by a control box, the control box is electrically connected with a specific gravity meter for detecting the specific gravity of hardening liquid, a sampling pipe inserted into the middle part of an impregnation tank is arranged at one end of the specific gravity meter, and the sampling pipe is convenient for detecting the specific gravity of the hardening liquid;
the front end of the dipping tank is provided with a presoaking tank which is convenient for the denitration catalyst to adhere to gel base solution, an adsorption roller which is used for adsorbing denitration catalyst fragments is arranged in the presoaking tank, and the adsorption roller is driven by a second micro motor which is arranged on the outer wall of the dipping tank;
the preparation method of the gel base solution comprises the following steps: 1) Adding proper amount of water into 100 parts of bentonite, adjusting the pH to 4-5, and stirring for 0.5h to obtain bentonite slurry; 2) Adding 20-35 parts of chitosan and 1.5-3.5 parts of glutaraldehyde into bentonite slurry, and stirring for 0.5h at normal temperature to prepare mixed slurry; 3) Injecting the mixed slurry into dilute alkali solution to gel for 10-12 h to prepare chitosan-bentonite composite gel; the preparation method of the hardening liquid comprises the following steps: 1) Putting 118 parts of water into a preparation kettle in parts by weight, and heating to 80 ℃; 2) Adding 100 parts of aluminum sulfate into the preparation kettle, and stirring for 2 hours at constant temperature to prepare hardening liquid;
the preparation method of the adsorption roller comprises the following steps: 1) According to the weight portion, 20 to 35 portions of chitosan is dissolved in acetic acid solution with the volume fraction of 0.8 percent to 1.2 percent to prepare chitosan-acetic acid solution; 2) Adding 100 parts of molecular sieve into the chitosan-acetic acid solution in the step 1), stirring and soaking for 8-12 h, filtering, washing with water, and drying at 60-80 ℃ to obtain chitosan-molecular sieve particles; 3) Preparing aluminum powder, alloy elements and chitosan-molecular sieve particles according to the weight part ratio of 58:12:30, filling the mixed powder into a mold, cold-pressing at room temperature for molding, and demolding to obtain an adsorption roller blank; 4) And placing the blank body in a hot-press shaping die for press shaping and machining to obtain the adsorption roller.
2. The self-fluid balance denitration catalyst end hardening device as set forth in claim 1, wherein: and a freeze drying mechanism is further arranged on one side of the dipping tank, the freeze drying mechanism comprises a freeze drying box and a muffle furnace which are sequentially connected through guide rails, an air drying conveying belt which is convenient for air drying of the denitration catalyst after dipping is arranged between the freeze drying box and the dipping tank, and the air drying conveying belt drives the discharge plate to convey to the freeze drying box.
3. A denitration catalyst end hardening process using the self-fluid-supplementing balance denitration catalyst end hardening device as set forth in claim 1, characterized by: the method comprises the following steps:
(1) Preparing gel base solution and hardening solution according to the weight portion ratio respectively, and putting the gel base solution into a pre-soaking tank, putting the hardening solution into a soaking tank, wherein the preparation method of the gel base solution comprises the following steps: 1) Adding proper amount of water into 100 parts of bentonite, adjusting the pH to 4-5, and stirring for 0.5h to obtain bentonite slurry; 2) Adding 20-35 parts of chitosan and 1.5-3.5 parts of glutaraldehyde into bentonite slurry, and stirring for 0.5h at normal temperature to prepare mixed slurry; 3) Injecting the mixed slurry into dilute alkali solution to gel for 10-12 h to prepare chitosan-bentonite composite gel, wherein the preparation method of the hardening liquid comprises the following steps: 1) Putting 118 parts of water into a preparation kettle in parts by weight, and heating to 80 ℃; 2) Adding 100 parts of aluminum sulfate into the preparation kettle, and stirring for 2 hours at constant temperature to prepare hardening liquid;
(2) Starting a second telescopic cylinder, pushing a discharge plate to move above a pre-soaking pool along the horizontal direction, starting a first telescopic cylinder, enabling a plurality of grabbing components to move downwards, vertically immersing a denitration catalyst in a notch of a clamping groove in the pre-soaking pool, immersing and coating for 5min, starting a rotating wheel, clamping corners of the rotating wheel into a bayonet, rotating the clamping groove along with the bayonet to sequentially carry out immersing and coating, reversely starting the first telescopic cylinder, enabling the plurality of grabbing components to move upwards, reversely starting the second telescopic cylinder, moving the discharge plate to the position above the soaking pool, starting the first telescopic cylinder, enabling the plurality of grabbing components to move downwards, vertically immersing the denitration catalyst in the notch of the clamping groove in the soaking pool, wherein the immersing height is 3-5 cm, and the immersing time is 40-60 s;
(3) Naturally air-drying the impregnated denitration catalyst to prepare the denitration catalyst with hardened end parts;
(4) The hardening liquid in the dipping tank is subjected to dynamic measurement on relative density by a specific gravity meter, the detection result is transmitted to a first metering pump or a second metering pump after calculation, the metering pump quantitatively transmits high-concentration aluminum sulfate solution to a buffer tank, or the second metering pump quantitatively transmits pure water to the buffer tank, or the first metering pump and the second metering pump quantitatively transmit aluminum sulfate solution and pure water to the buffer tank at the same time;
(5) The method comprises the following steps that a floating ball in an impregnating tank slides downwards along with the liquid level of hardening liquid, a first button switch is triggered after a connecting rod deflects upwards, an electromagnet is connected and then is attracted with an attracting ring, a sliding block moves upwards along a sliding cylinder, barbs in the middle of the sliding block penetrate into a one-way valve, supplementing liquid in a buffer tank flows into the impregnating tank along the barbs, an adsorption roller is driven to rotate around a shaft through a second micro motor, denitration catalyst fragments in the impregnating tank are adsorbed and stirred after the mixed hardening liquid, the hardening liquid in the impregnating tank keeps initial concentration for reuse, after supplementing the supplementing liquid in the buffer tank is completed, the floating ball moves upwards along with the liquid level of the hardening liquid, a second button switch is triggered after the connecting rod deflects downwards, the electromagnet is disconnected, the attracting ring falls down, the sliding block slides to the bottom of the sliding cylinder, and the barbs are separated from the one-way valve, and the preparation method of the adsorption roller comprises the following steps: 1) According to the weight portion, 20 to 35 portions of chitosan is dissolved in acetic acid solution with the volume fraction of 0.8 percent to 1.2 percent to prepare chitosan-acetic acid solution; 2) Adding 100 parts of molecular sieve into the chitosan-acetic acid solution in the step 1), stirring and soaking for 8-12 h, filtering, washing with water, and drying at 60-80 ℃ to obtain chitosan-molecular sieve particles; 3) Preparing aluminum powder, alloy elements and chitosan-molecular sieve particles according to the weight part ratio of 58:12:30, filling the mixed powder into a mold, cold-pressing at room temperature for molding, and demolding to obtain an adsorption roller blank; 4) And placing the blank body in a hot-press shaping die for press shaping and machining to obtain the adsorption roller.
4. A denitration catalyst end hardening process as set forth in claim 3 wherein: and (3) conveying the impregnated denitration catalyst in the step (2) to a freeze drying box for freeze drying through an air drying conveying belt, conveying the freeze-dried denitration catalyst to a muffle furnace for calcination at 300-500 ℃ for 0.5-1 h, and obtaining the denitration catalyst with hardened end parts.
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