CN115651731B - Ash and coke removing slag remover for boiler - Google Patents
Ash and coke removing slag remover for boiler Download PDFInfo
- Publication number
- CN115651731B CN115651731B CN202211403692.5A CN202211403692A CN115651731B CN 115651731 B CN115651731 B CN 115651731B CN 202211403692 A CN202211403692 A CN 202211403692A CN 115651731 B CN115651731 B CN 115651731B
- Authority
- CN
- China
- Prior art keywords
- composite
- ash
- boiler
- composite microsphere
- stirring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Manufacturing Of Micro-Capsules (AREA)
Abstract
The invention relates to the technical field of boiler decoking, in particular to a dust-cleaning decoking slag remover for a boiler, which comprises the following steps: 1) Preparing a treatment fluid; 2) Immersing the composite microspheres in a treatment liquid to obtain pretreated composite microspheres, and adding the pretreated composite microspheres into a prepared reaction liquid to obtain embedded composite microspheres; 3) Sequentially adding the nitrate mixture and the sulfate mixture into a container, uniformly mixing, sequentially adding boric acid and water under stirring, adding the embedded composite microsphere and the dispersing agent, fully stirring, and standing for 1-3h to obtain the required ash-removing and tar-removing slag-removing agent. The ash-removing and coke-removing slag remover effectively removes coking and Gao Wenji ash on the heating surface of the boiler, strengthens heat transfer of the boiler, reduces the temperature of flue gas of the boiler, improves the heat exchange efficiency, obviously reduces the amount of secondary temperature-reducing water, and improves the safety and the economical efficiency of a unit to a certain extent.
Description
Technical Field
The invention relates to the technical field of boiler decoking, in particular to a dust-cleaning decoking slag remover for a boiler.
Background
Coking is a common problem in coal-fired boiler operation, in the center of the boiler furnace, the temperature of the combustion flame center is between 1500 ℃ and 1700 ℃, ash in fuel is mostly melted into liquid state or is in a softened state at such high temperature, and due to heat absorption of the water cooling wall, the lower the temperature is, the closer to the water cooling wall is, and under normal conditions, ash is changed into a softened state from liquid state to solid state along with the reduction of temperature. When ash is still in a softened state and contacts the heating surface, the ash is cooled and adheres to the heating surface, and coking is formed. Coking not only can cause the temperature of the overheat steam to rise and cause the steam pipe to explode, even can reduce the output of the boiler, but also can cause forced furnace shutdown when serious, and can also shorten the service life of the boiler equipment.
For example, the invention patent with publication number CN113430030a discloses a decoking agent for boiler, comprising a nitrate mixture, polymer microspheres, a dispersing agent; the hydrophilic polyethylene glycol chain segment and the lipophilic organic silicon chain segment are combined together to form a macromolecular polymer which is used as a dispersing agent, so that the dispersing of the decoking agent is more uniform in the decoking process, and a better decoking effect can be achieved; in addition, polymer microspheres are used, after being dispersed and heated under the action of a dispersing agent, substances in the microspheres can expand in volume and finally burst through the outer layer to release gas, so that the coke layer is broken down, the coke layer is changed into a loose structure from a compact structure, and the decoking rate is remarkably improved; in the technical scheme, the polymer microspheres are utilized to expand to release gas, so that a coke layer is broken, and a decoking effect is achieved, but because the shell bearing capacity of the polymer microspheres is general, when the polymer microspheres are expanded to release gas, the generated gas shock wave is weaker, although the loosening of part of the coke layer structure can be caused, but the effect is poorer for thicker coke layers, and because the polymer microspheres do not have excellent permeability, most of the polymer microspheres exist on the surface of the coke layer and cannot permeate into the coke layer, the gas shock wave generated by the polymer microspheres has a shock effect on the coke layer from the outside, so that the shock effect is poorer, the high loosening of the coke layer structure is not facilitated, and the coke layer is extruded towards the direction of the boiler wall, so that part of the coke layer is firmly attached to the boiler wall.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the ash-removing and coke-removing slag-removing agent for the boiler, which comprises the embedded composite microsphere, wherein the shell of the embedded composite microsphere has high-strength bearing capacity, so that more paraffin vapor can be accumulated in the embedded composite microsphere, and stronger shock waves can be generated when the embedded composite microsphere bursts, thereby being more beneficial to the falling of a coke layer and ash; meanwhile, the embedded composite microsphere can be efficiently permeated into the coke layer, the impact generated by burst of the embedded composite microsphere is used for impacting the coke layer from the inside, so that the loosening of the coke layer structure is facilitated, the nano-sheets deposited on the surface layer of the embedded composite microsphere can be scattered and splashed when the embedded composite microsphere is impacted, the coke layer can be collided, and the falling of the coke layer is accelerated, and the effects of ash removal, decoking and slag removal are further improved.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the ash and coke removing slag remover for the boiler specifically comprises the following preparation steps:
1) Sequentially adding tetraethoxysilane and 3-glycidoxypropyl trimethoxysilane into deionized water, fully stirring, then dropwise adding an aqueous solution of phytic acid, uniformly mixing, and then adding triethylene tetramine to obtain a treatment solution for later use;
2) Immersing the composite microsphere into a treatment liquid, taking out, draining and carrying out heat preservation treatment for 5-8 hours to obtain a pretreated composite microsphere, adding cadmium chloride and sublimed sulfur into a reaction kettle, adding diethylenetriamine and deionized water, fully stirring to obtain a reaction liquid, adding the pretreated composite microsphere into the reaction liquid, sealing, reacting for 20-40 minutes, washing, and freeze-drying to obtain an embedded composite microsphere;
3) Sequentially adding the nitrate mixture and the sulfate mixture into a container, uniformly mixing, sequentially adding boric acid and water under stirring, adding the embedded composite microsphere and the dispersing agent, fully stirring, and standing for 1-3h to obtain the required ash-removing and tar-removing slag-removing agent.
As a further preferable mode of the invention, in the treatment solution, the dosage proportion of the tetraethoxysilane, the 3-glycidoxypropyl trimethoxysilane, the deionized water, the phytic acid aqueous solution and the triethylene tetramine is (2-5) g: (1-3) g: (300-500) mL: (13-18) mL: (0.5-0.9) g;
the concentration of the phytic acid aqueous solution is 0.02-0.05mol/L.
As a further preferable scheme of the invention, the mass-volume ratio of the composite microsphere to the treatment fluid is 1g: (15-30) mL;
the dipping time of the composite microsphere is 1-3min;
the temperature of the heat preservation treatment is 135-140 ℃.
As a further preferable scheme of the invention, the dosage ratio of cadmium chloride, sublimed sulfur, diethylenetriamine and deionized water in the reaction liquid is (1.5-2.0) g: (1.2-1.5) g: (24-30) mL: (12-18) mL;
the mass volume ratio of the pretreated composite microsphere to the reaction liquid is 1g: (25-45) mL;
the reaction temperature is 138-142 ℃.
As a further preferable scheme of the invention, the nitrate mixture, the sulfate mixture, the boric acid, the embedded composite microsphere, the dispersing agent and the water are respectively 30-60 parts, 12-18 parts, 0.3-0.6 part, 15-30 parts, 1-3 parts and 25-40 parts by weight.
As a further preferable scheme of the invention, the nitrate mixture is prepared from copper nitrate and potassium nitrate according to a mass ratio of 1: (27-32);
the sulfate mixture is prepared from magnesium sulfate and ammonium sulfate according to a mass ratio of 1: (5-7);
the dispersing agent is at least one of maleic acid-acrylic acid copolymer and acrylic acid-acrylamide copolymer.
As a further preferable scheme of the invention, the preparation method of the composite microsphere comprises the following steps:
1) Mixing nano silicon dioxide, sodium chloride, polyvinylpyrrolidone, sodium nitrite, absolute ethyl alcohol and deionized water, homogenizing for 3-5min, regulating the pH value to 2.5-3.5 by using concentrated hydrochloric acid to obtain a water phase, and fully mixing acrylonitrile, methacrylic acid, N-dimethylacrylamide, ethylene glycol dimethacrylate, butyl acrylate, N-pentane and azodiisobutyronitrile to obtain an oil phase for later use;
2) Placing the hollow fiber in a container, uniformly spreading excessive paraffin on the hollow fiber, moving into a vacuum drying oven, vacuumizing and heating, preserving heat for 20-30min after the paraffin is completely melted, taking out the container, fully stirring, moving into an oven again, repeating vacuumizing-preserving heat-stirring operation for 5-10 times, taking out the product, and then placing into the drying oven for repeated drying until the paraffin is no longer overflowed, thus obtaining the composite hollow fiber;
3) Dispersing the composite hollow fiber in a water phase to obtain a composite water phase, slowly injecting an oil phase into the composite water phase under stirring to obtain emulsion, injecting the emulsion into a reaction kettle, introducing nitrogen to exhaust air and pressurizing to 0.5-0.8MPa, reacting at constant temperature for 23-27h, naturally cooling to room temperature, repeatedly washing the product with deionized water, drying, crushing and sieving to obtain the composite microsphere.
As a further preferable scheme of the invention, in the water phase, the mass ratio of nano silicon dioxide, sodium chloride, polyvinylpyrrolidone, sodium nitrite, absolute ethyl alcohol and deionized water is (7-10): (45-53): (0.1-0.3): (0.03-0.05): (0.06-0.09): (150-200);
in the oil phase, the mass ratio of acrylonitrile, methacrylic acid, N-dimethylacrylamide, ethylene glycol dimethacrylate, butyl acrylate, N-pentane and azodiisobutyronitrile is (15-20): (4.3-4.9): (2.3-2.6): (0.09-0.12): (1.1-1.3): (8-10): (0.1-0.2).
As a further preferable scheme of the invention, the temperature of the vacuum drying oven is 60-70 ℃;
the temperature of the drying oven is 72-76 ℃.
As a further preferable scheme of the invention, the dosage ratio of the composite hollow fiber to the water phase in the composite water phase is (5-10) g: (120-180) mL;
in the emulsion, the mass ratio of the composite water phase to the oil phase is 100: (20-30);
the constant temperature reaction is carried out at 60-65 ℃ and 200-260 r/min;
the particle size of the composite microsphere is 400-600 meshes.
Compared with the prior art, the invention has the beneficial effects that:
in the invention, methacrylic acid/acrylonitrile copolymer is taken as a shell body, alkane foaming agent and composite hollow fiber are taken as a nuclear body, an emulsion suspension polymerization method is adopted to obtain composite microspheres, the composite microspheres are taken as one of raw materials of an ash removal and deslagging agent, when sprayed on a coke layer, the composite microspheres penetrate into gaps of the coke layer and are subjected to the high-temperature effect in a boiler, the composite microspheres are heated and expanded to play the role of increasing the distance between the coke layer and the boiler wall, the bonding strength between the coke layer and the boiler wall is reduced, so that the coke layer is easy to fall off under the expansion of the composite microspheres, meanwhile, the composite hollow fiber in the nuclear body takes the hollow fiber as a carrier, the paraffin is loaded in the hollow fiber, under the high-temperature effect of the boiler, the paraffin is heated and melted into liquid paraffin, and the liquid paraffin is gasified into paraffin vapor along with the rising of the temperature, and is continuously generated along with the continuous generation of the paraffin vapor, the internal pressure of the composite microspheres is gradually increased, the ash and the ash is easy to fall off under the condition that the bearing capacity of the composite microsphere shell, and the ash removal effect is more caused by the coke layer is generated, and the ash removal effect is more loose, and the ash removal effect is achieved; meanwhile, the composite hollow fiber is intertwined and crosslinked in the nuclear body to form a reticular structure, the skeleton supporting structure is constructed and formed, the skeleton supporting structure is penetrated in the nuclear body, the strength of the nuclear body in the composite microsphere is improved, a certain blocking effect is played on the expansion of the nuclear body, the expansion speed of the nuclear body is slowed down, sufficient time is provided for the composite microsphere to infiltrate into gaps of a coke layer, and the expansion is started after most of the composite microsphere infiltrates into the coke layer, so that the reduction of the bonding strength between the coke layer and the boiler wall is facilitated, and the falling rate of the coke layer is further improved.
In order to improve the bearing capacity of the composite microsphere shell, the composite microsphere is processed, tetraethoxysilane and 3-glycidoxypropyl trimethoxysilane are used as organic precursors of silicon, triethylene tetramine is used as a cross-linking agent, phytic acid is used as a hydrolysis catalyst to prepare treatment fluid, a protective film formed by silane nano self-assembly is formed on the surface of the composite microsphere by a method of infiltration and high-temperature treatment, the pretreated composite microsphere is obtained, the formed protective film is wrapped on the composite microsphere, the effect of enhancing the shell strength is achieved, the bearing capacity of the shell is improved, more paraffin steam can be gathered in the composite microsphere, so that the composite microsphere can generate stronger shock waves when burst, and the falling of a coke layer and ash slag is facilitated; meanwhile, in order to improve the permeability of the composite microsphere in the coke layer, the pretreated composite microsphere is used as a matrix, the nano-sheet layer is deposited on the surface of the pretreated composite microsphere through a hydrothermal method to obtain the embedded composite microsphere, the formed nano-sheet layer can play a role in lubrication and antifriction, friction resistance when the embedded composite microsphere is permeated into the coke layer is effectively reduced, the permeability of the embedded composite microsphere is improved, the abrasion of a shell when the embedded composite microsphere is permeated is reduced, the influence of friction loss on the strength of the shell is avoided, the embedded composite microsphere permeated into the coke layer has a complete structure, the formed nano-sheet layer can play a role in enhancing the strength of the shell, the bearing capacity of the shell is further improved, and the nano-sheet deposited on the surface layer is scattered and splashed due to the impact effect when the embedded composite microsphere is burst, and the coke layer is collided, so that the falling of the coke layer is accelerated, and the ash removal and slag removal effects are further improved.
The ash-removing and coke-removing slag-removing agent comprises the embedded composite microsphere, wherein the shell of the embedded composite microsphere has high-strength bearing capacity, so that more paraffin steam can be gathered in the embedded composite microsphere, and the embedded composite microsphere can generate stronger shock waves when burst, thereby being more beneficial to the falling-off of a coke layer and ash slag; meanwhile, the embedded composite microsphere can be efficiently permeated into the coke layer, the impact generated by bursting of the embedded composite microsphere is used for impacting the coke layer from the inside, so that the loosening of the coke layer structure is facilitated, the nano sheets deposited on the surface layer of the embedded composite microsphere are scattered and splashed along with bursting of the embedded composite microsphere, and the coke layer is collided, thereby being beneficial to accelerating the falling of the coke layer and further improving the effects of ash removal, coke removal and slag removal.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The ash and coke removing slag remover for the boiler specifically comprises the following preparation steps:
1) Sequentially adding 2g of tetraethoxysilane and 1g of 3-glycidoxypropyl trimethoxysilane into 300mL of deionized water, fully stirring, dropwise adding 13mL of phytic acid aqueous solution with the concentration of 0.02mol/L, stirring and mixing for 5h at 120r/min, adding 0.5g of triethylene tetramine, and continuously stirring for 5h to obtain a treatment solution for later use;
2) The mass volume ratio is 1g:15mL, immersing the composite microsphere into a treatment solution, taking out after immersing for 1min, draining, carrying out heat preservation treatment for 5h at 135 ℃ to obtain a pretreated composite microsphere, weighing 1.5g of cadmium chloride and 1.2g of sublimed sulfur, sequentially adding into a reaction kettle, adding 24mL of diethylenetriamine and 12mL of deionized water, and fully stirring to obtain a reaction solution, wherein the mass volume ratio is 1g: adding 25mL of the pretreated composite microsphere into the reaction solution, fully dispersing, sealing, reacting for 20min at 138 ℃, naturally cooling to room temperature, repeatedly washing the product with deionized water, and freeze-drying to obtain the embedded composite microsphere;
3) Weighing 30 parts of nitrate mixture, 12 parts of sulfate mixture, 0.3 part of boric acid, 15 parts of embedded composite microsphere, 1 part of dispersing agent and 25 parts of water according to the weight fraction, sequentially adding the nitrate mixture and the sulfate mixture into a container, fully stirring and uniformly mixing, sequentially adding boric acid and water under 70r/min stirring, stirring for 10min, adding the embedded composite microsphere and the dispersing agent, stirring for 20min at 200r/min, and standing for 1h to obtain the required ash-removing and tar-removing slag-removing agent;
wherein, the nitrate mixture is prepared from copper nitrate and potassium nitrate according to the mass ratio of 1: 27;
the sulfate mixture comprises magnesium sulfate and ammonium sulfate according to the mass ratio of 1:5, composing;
the dispersant is selected from maleic acid-acrylic acid copolymer.
The preparation method of the composite microsphere comprises the following steps:
1) Sequentially adding 7g of nano silicon dioxide, 45g of sodium chloride, 0.1g of polyvinylpyrrolidone, 0.03g of sodium nitrite, 0.06g of absolute ethyl alcohol and 150g of deionized water into a container, homogenizing for 3min at 10000rpm by using an emulsifying machine, regulating the pH value to 2.5 by using concentrated hydrochloric acid to obtain a water phase, adding 15g of acrylonitrile, 4.3g of methacrylic acid, 2.3g of N, N-dimethylacrylamide, 0.09g of ethylene glycol dimethacrylate, 1.1g of butyl acrylate, 8g of n-pentane and 0.1g of azobisisobutyronitrile into the container, and stirring for 5min at 600r/min to obtain an oil phase for later use;
2) Placing the hollow fiber in a container, uniformly spreading excessive paraffin on the hollow fiber, moving to a vacuum drying oven at 60 ℃, vacuumizing, continuously preserving heat for 20min after the paraffin is completely melted, taking out the container, stirring for 10min at 100r/min, then moving to an oven again, repeating vacuumizing-heat preservation-stirring operation for 5 times, taking out the product, and then placing the product in the drying oven at 72 ℃ for repeated drying until the paraffin is not overflowed, thus obtaining the composite hollow fiber;
3) Dispersing 5g of composite hollow fiber in 120mL of water phase to obtain a composite water phase, and stirring at 800r/min according to the mass ratio of the composite water phase to the oil phase of 100:20, slowly injecting the oil phase into the composite water phase, stirring for 30min to obtain emulsion, injecting the emulsion into a reaction kettle, introducing nitrogen to exhaust air, increasing the pressure in the reaction kettle to 0.5MPa by using nitrogen, performing constant-temperature reaction for 23h at 60 ℃ and 200r/min, naturally cooling to room temperature, repeatedly washing the product with deionized water, drying, crushing, and sieving with a 400-mesh sieve to obtain the composite microspheres.
Example 2
The ash and coke removing slag remover for the boiler specifically comprises the following preparation steps:
1) Sequentially adding 3g of tetraethoxysilane and 1.5g of 3-glycidoxypropyl trimethoxysilane into 400mL of deionized water, fully stirring, dropwise adding 15mL of phytic acid aqueous solution with the concentration of 0.04mol/L, stirring and mixing for 7h at 180r/min, adding 0.6g of triethylene tetramine, and continuously stirring for 7h to obtain a treatment solution for later use;
2) The mass volume ratio is 1g:25mL, immersing the composite microsphere into a treatment solution, taking out after immersing for 2min, draining, carrying out heat preservation treatment for 7h at 137 ℃ to obtain a pretreated composite microsphere, weighing 1.8g of cadmium chloride and 1.3g of sublimed sulfur, sequentially adding into a reaction kettle, adding 26mL of diethylenetriamine and 15mL of deionized water, and fully stirring to obtain a reaction solution, wherein the mass volume ratio is 1g: adding 40mL of pretreated composite microspheres into a reaction solution, fully dispersing, sealing, reacting for 30min at 140 ℃, naturally cooling to room temperature, repeatedly washing the product with deionized water, and freeze-drying to obtain embedded composite microspheres;
3) Weighing 50 parts of nitrate mixture, 17 parts of sulfate mixture, 0.5 part of boric acid, 20 parts of embedded composite microsphere, 2 parts of dispersing agent and 35 parts of water according to weight fraction, sequentially adding the nitrate mixture and the sulfate mixture into a container, fully stirring and uniformly mixing, sequentially adding boric acid and water under 80r/min stirring, stirring for 20min, adding the embedded composite microsphere and the dispersing agent, stirring for 40min at 260r/min, and standing for 2h to obtain the required ash-removing and tar-removing slag-removing agent;
wherein, the nitrate mixture is prepared from copper nitrate and potassium nitrate according to the mass ratio of 1: 30;
the sulfate mixture comprises magnesium sulfate and ammonium sulfate according to the mass ratio of 1:6, composition;
the dispersant is selected from maleic acid-acrylic acid copolymer.
The preparation method of the composite microsphere comprises the following steps:
1) Sequentially adding 8g of nano silicon dioxide, 50g of sodium chloride, 0.2g of polyvinylpyrrolidone, 0.04g of sodium nitrite, 0.08g of absolute ethyl alcohol and 185g of deionized water into a container, homogenizing for 4min at 20000rpm by using an emulsifying machine, regulating the pH value to 3 by using concentrated hydrochloric acid to obtain a water phase, adding 16g of acrylonitrile, 4.5g of methacrylic acid, 2.4N, N-dimethylacrylamide, 0.01g of ethylene glycol dimethacrylate, 1.2g of butyl acrylate, 9g of n-pentane and 0.2g of azobisisobutyronitrile into the container, and stirring for 8min at 700r/min to obtain an oil phase for later use;
2) Placing the hollow fiber in a container, uniformly spreading excessive paraffin on the hollow fiber, moving to a 65 ℃ vacuum drying oven, vacuumizing, continuously preserving heat for 25min after the paraffin is completely melted, taking out the container, stirring for 20min at 160r/min, then moving to an oven again, repeating vacuumizing-heat preservation-stirring operation for 8 times, taking out the product, and then placing the product in the 75 ℃ drying oven for repeated drying until the paraffin is not overflowed, thus obtaining the composite hollow fiber;
3) 8g of the composite hollow fiber is dispersed in 160mL of water phase to obtain a composite water phase, and the mass ratio of the composite water phase to the oil phase is 100 under the stirring of 900 r/min: 25, slowly injecting the oil phase into the composite water phase, stirring for 35min to obtain emulsion, injecting the emulsion into a reaction kettle, introducing nitrogen to exhaust air, increasing the pressure in the reaction kettle to 0.6MPa by using nitrogen, performing constant-temperature reaction for 25h at 62 ℃ and 230r/min, naturally cooling to room temperature, repeatedly washing the product with deionized water, drying, crushing, and sieving with a 500-mesh sieve to obtain the composite microspheres.
Example 3
The ash and coke removing slag remover for the boiler specifically comprises the following preparation steps:
1) Sequentially adding 5g of tetraethoxysilane and 3g of 3-glycidoxypropyl trimethoxysilane into 500mL of deionized water, fully stirring, dropwise adding 18mL of phytic acid aqueous solution with the concentration of 0.05mol/L, stirring and mixing for 8 hours at 200r/min, adding 0.9g of triethylene tetramine, and continuously stirring for 8 hours to obtain a treatment solution for later use;
2) The mass volume ratio is 1g:30mL, immersing the composite microsphere into a treatment solution, taking out after immersing for 3min, draining, carrying out heat preservation treatment for 8h at 140 ℃ to obtain a pretreated composite microsphere, weighing 2g of cadmium chloride and 1.5g of sublimed sulfur, sequentially adding into a reaction kettle, adding 30mL of diethylenetriamine and 18mL of deionized water, and fully stirring to obtain a reaction solution, wherein the mass volume ratio is 1g:45mL, adding the pretreated composite microspheres into the reaction solution, fully dispersing, sealing, reacting for 40min at 142 ℃, naturally cooling to room temperature, repeatedly washing the product with deionized water, and freeze-drying to obtain embedded composite microspheres;
3) Weighing 60 parts of nitrate mixture, 18 parts of sulfate mixture, 0.6 part of boric acid, 30 parts of embedded composite microsphere, 3 parts of dispersing agent and 40 parts of water according to weight fraction, sequentially adding the nitrate mixture and the sulfate mixture into a container, fully stirring and uniformly mixing, sequentially adding boric acid and water under 90r/min stirring, stirring for 30min, adding the embedded composite microsphere and the dispersing agent, stirring for 50min at 300r/min, and standing for 3h to obtain the required ash-removing and tar-removing slag-removing agent;
wherein, the nitrate mixture is prepared from copper nitrate and potassium nitrate according to the mass ratio of 1: 32;
the sulfate mixture comprises magnesium sulfate and ammonium sulfate according to the mass ratio of 1:7, forming;
the dispersant is selected from acrylic acid-acrylamide copolymer.
The preparation method of the composite microsphere comprises the following steps:
1) Sequentially adding 10g of nano silicon dioxide, 53g of sodium chloride, 0.3g of polyvinylpyrrolidone, 0.05g of sodium nitrite, 0.09g of absolute ethyl alcohol and 200g of deionized water into a container, homogenizing at 20000rpm for 5min by using an emulsifying machine, regulating the pH value to 3.5 by using concentrated hydrochloric acid to obtain a water phase, adding 20g of acrylonitrile, 4.9g of methacrylic acid, 2.6g of N, N-dimethylacrylamide, 0.12g of ethylene glycol dimethacrylate, 1.3g of butyl acrylate, 10g of n-pentane and 0.2g of azobisisobutyronitrile into the container, stirring for 10min at 800r/min to obtain an oil phase for later use;
2) Placing the hollow fiber in a container, uniformly spreading excessive paraffin on the hollow fiber, moving to a vacuum drying oven at 70 ℃, vacuumizing, continuously preserving heat for 30min after the paraffin is completely melted, taking out the container, stirring for 30min at 180r/min, then moving to an oven again, repeating vacuumizing-heat preservation-stirring operation for 10 times, taking out the product, and then placing the product in the drying oven at 76 ℃ for repeated drying until the paraffin is not overflowed, thus obtaining the composite hollow fiber;
3) 10g of composite hollow fiber is dispersed in 180mL of water phase to obtain composite water phase, and the mass ratio of the composite water phase to the oil phase is 100 under the stirring of 1000 r/min: 30, slowly injecting the oil phase into the composite water phase, stirring for 40min to obtain emulsion, injecting the emulsion into a reaction kettle, introducing nitrogen to exhaust air, increasing the pressure in the reaction kettle to 0.8MPa by using nitrogen, performing constant-temperature reaction for 27h at 65 ℃ and 260r/min, naturally cooling to room temperature, repeatedly washing the product with deionized water, drying, crushing, and sieving with a 600-mesh sieve to obtain the composite microspheres.
Comparative example 1: this comparative example is substantially the same as example 1 except that the embedded composite microsphere is not contained.
Comparative example 2: this comparative example is substantially the same as example 1, except that the composite microspheres were not pretreated.
Comparative example 3: this comparative example is substantially the same as example 1 except that composite microspheres are used instead of embedded composite microspheres.
Comparative example 4: this comparative example is substantially the same as example 1 except that the pretreated composite microspheres are used instead of the embedded composite microspheres.
Comparative example 5: this comparative example is substantially the same as example 1 except that a porous carbon support was used instead of the hollow fiber in the preparation of the composite microsphere.
Test:
using the samples of the ash and coke removal deslagging agents provided in examples 1-3 and comparative examples 1-5, 400kg was added weekly, and 3 times added to the furnace of a 600MW power plant supercritical boiler (using 8 kg/cm) 2 The decoking agent was sprayed into the furnace chamber), after 3 months of use of the decoking agent, the slag condition was observed, and the average decrease in the exhaust gas temperature after correction in each load zone and the decrease in the secondary temperature-reducing water amount were recorded, and the results are shown in table 1.
TABLE 1
As can be seen from the table, the ash-removing and coke-removing slag-removing agent provided by the invention has the advantages that coking and Gao Wenji ash on the heating surface of the boiler are efficiently removed, and the heat transfer of the boiler is enhanced, so that the flue gas temperature of the boiler is reduced, the heat exchange efficiency is improved, the secondary temperature-reducing water quantity is obviously reduced, and the safety and the economical efficiency of a unit are improved to a certain extent.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (9)
1. The ash and coke removing slag remover for the boiler is characterized by comprising the following preparation steps:
1) Sequentially adding tetraethoxysilane and 3-glycidoxypropyl trimethoxysilane into deionized water, fully stirring, then dropwise adding an aqueous solution of phytic acid, uniformly mixing, and then adding triethylene tetramine to obtain a treatment solution for later use;
2) Immersing the composite microsphere into a treatment liquid, taking out, draining and carrying out heat preservation treatment for 5-8 hours to obtain a pretreated composite microsphere, adding cadmium chloride and sublimed sulfur into a reaction kettle, adding diethylenetriamine and deionized water, fully stirring to obtain a reaction liquid, adding the pretreated composite microsphere into the reaction liquid, sealing, reacting for 20-40 minutes, washing, and freeze-drying to obtain an embedded composite microsphere;
3) Sequentially adding the nitrate mixture and the sulfate mixture into a container, uniformly mixing, sequentially adding boric acid and water under stirring, adding embedded composite microspheres and a dispersing agent, fully stirring, and standing for 1-3h to obtain the required ash-removing and tar-removing slag-removing agent;
the preparation method of the composite microsphere comprises the following steps:
1) Mixing nano silicon dioxide, sodium chloride, polyvinylpyrrolidone, sodium nitrite, absolute ethyl alcohol and deionized water, homogenizing for 3-5min, regulating the pH value to 2.5-3.5 by using concentrated hydrochloric acid to obtain a water phase, and fully mixing acrylonitrile, methacrylic acid, N-dimethylacrylamide, ethylene glycol dimethacrylate, butyl acrylate, N-pentane and azodiisobutyronitrile to obtain an oil phase for later use;
2) Placing the hollow fiber in a container, uniformly spreading excessive paraffin on the hollow fiber, moving into a vacuum drying oven, vacuumizing and heating, preserving heat for 20-30min after the paraffin is completely melted, taking out the container, fully stirring, moving into an oven again, repeating vacuumizing-preserving heat-stirring operation for 5-10 times, taking out the product, and then placing into the drying oven for repeated drying until the paraffin is no longer overflowed, thus obtaining the composite hollow fiber;
3) Dispersing the composite hollow fiber in a water phase to obtain a composite water phase, slowly injecting an oil phase into the composite water phase under stirring to obtain emulsion, injecting the emulsion into a reaction kettle, introducing nitrogen to exhaust air and pressurizing to 0.5-0.8MPa, reacting at constant temperature for 23-27h, naturally cooling to room temperature, repeatedly washing the product with deionized water, drying, crushing and sieving to obtain the composite microsphere.
2. The boiler ash and coke removal deslagging agent according to claim 1, wherein the dosage ratio of tetraethoxysilane, 3-glycidoxypropyl trimethoxysilane, deionized water, phytic acid aqueous solution and triethylene tetramine in the treatment solution is (2-5) g: (1-3) g: (300-500) mL: (13-18) mL: (0.5-0.9) g;
the concentration of the phytic acid aqueous solution is 0.02-0.05mol/L.
3. The ash and coke removing slag remover for boilers as claimed in claim 1, wherein the mass-volume ratio of the composite microsphere to the treatment fluid is 1g: (15-30) mL;
the dipping time of the composite microsphere is 1-3min;
the temperature of the heat preservation treatment is 135-140 ℃.
4. The ash and coke removal deslagging agent for a boiler according to claim 1, wherein the dosage ratio of cadmium chloride, sublimed sulfur, diethylenetriamine and deionized water in the reaction solution is (1.5-2.0) g: (1.2-1.5) g: (24-30) mL: (12-18) mL;
the mass volume ratio of the pretreated composite microsphere to the reaction liquid is 1g: (25-45) mL;
the reaction temperature is 138-142 ℃.
5. The agent according to claim 1, wherein the nitrate mixture, sulfate mixture, boric acid, embedded composite microsphere, dispersant and water are 30-60 parts, 12-18 parts, 0.3-0.6 part, 15-30 parts, 1-3 parts and 25-40 parts by weight, respectively.
6. The ash and coke removal deslagging agent for a boiler according to claim 1, wherein the nitrate mixture comprises copper nitrate and potassium nitrate in a mass ratio of 1: (27-32);
the sulfate mixture is prepared from magnesium sulfate and ammonium sulfate according to a mass ratio of 1: (5-7);
the dispersing agent is at least one of maleic acid-acrylic acid copolymer and acrylic acid-acrylamide copolymer.
7. The ash and coke removal deslagging agent for a boiler according to claim 1, wherein the mass ratio of nano silicon dioxide, sodium chloride, polyvinylpyrrolidone, sodium nitrite, absolute ethyl alcohol and deionized water in the water phase is (7-10): (45-53): (0.1-0.3): (0.03-0.05): (0.06-0.09): (150-200);
in the oil phase, the mass ratio of acrylonitrile, methacrylic acid, N-dimethylacrylamide, ethylene glycol dimethacrylate, butyl acrylate, N-pentane and azodiisobutyronitrile is (15-20): (4.3-4.9): (2.3-2.6): (0.09-0.12): (1.1-1.3): (8-10): (0.1-0.2).
8. The ash and coke removal deslagging agent for a boiler according to claim 1, wherein the temperature of the vacuum drying oven is 60-70 ℃;
the temperature of the drying oven is 72-76 ℃.
9. The ash and coke removal deslagging agent for boiler according to claim 1, wherein the amount ratio of the composite hollow fiber to the water phase in the composite water phase is (5-10) g: (120-180) mL;
in the emulsion, the mass ratio of the composite water phase to the oil phase is 100: (20-30);
the constant temperature reaction is carried out at 60-65 ℃ and 200-260 r/min;
the particle size of the composite microsphere is 400-600 meshes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211403692.5A CN115651731B (en) | 2022-11-10 | 2022-11-10 | Ash and coke removing slag remover for boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211403692.5A CN115651731B (en) | 2022-11-10 | 2022-11-10 | Ash and coke removing slag remover for boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115651731A CN115651731A (en) | 2023-01-31 |
| CN115651731B true CN115651731B (en) | 2023-06-16 |
Family
ID=85021645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211403692.5A Active CN115651731B (en) | 2022-11-10 | 2022-11-10 | Ash and coke removing slag remover for boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115651731B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7658838B2 (en) * | 2003-05-16 | 2010-02-09 | Exxonmobil Research And Engineering Company | Delayed coking process for producing free-flowing coke using polymeric additives |
| CN106987298A (en) * | 2017-04-21 | 2017-07-28 | 常州思宇环保材料科技有限公司 | A kind of preparation method of environmental protection coal-fired boiler coke-removing agent |
| CN108047480B (en) * | 2017-12-05 | 2020-11-27 | 山东瑞丰高分子材料股份有限公司 | High-temperature expanded polymer microsphere and preparation method thereof |
| CN113430030B (en) * | 2021-07-23 | 2022-08-30 | 北京科林佰德环保有限公司 | Decoking agent for boiler |
-
2022
- 2022-11-10 CN CN202211403692.5A patent/CN115651731B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN115651731A (en) | 2023-01-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103588595B (en) | Steel fiber toughen and intensify TNT base castexplosive and preparation method thereof | |
| CN109956844B (en) | Preparation method of fluoropolymer/metal composite energetic material | |
| CN115651731B (en) | Ash and coke removing slag remover for boiler | |
| CN110204403B (en) | Low-sensitivity high-strength HMX-based composite material and preparation method thereof | |
| CN110343020A (en) | A kind of preparation method of Nanometallization explosive | |
| CN103724564A (en) | Kapok fiber-based three-dimensional network oil absorption material | |
| CN107892272A (en) | AlH3/ functionalization graphene composite and its preparation method and application | |
| CN115819161A (en) | Preparation method of boron-based active material energetic micro-pill | |
| CN111040231A (en) | PVA-based flame-retardant composite aerogel and preparation method and application thereof | |
| CN113698266B (en) | Acidic inhibition type NTO-based mixed explosive molding powder and preparation method thereof | |
| CA1315993C (en) | System and method for efficiently generating power in a solid fuel gas turbine | |
| CN107400436A (en) | A kind of water-based double microcapsules suppression weather-proof expansion steel-structure fireproofing coatings of cigarette and preparation method thereof | |
| CN101619253B (en) | Moulded coal fuel composition and preparation method thereof | |
| CN110453226B (en) | Corrosion inhibitor for improving ablation resistance of metal and preparation method thereof | |
| CN107056562A (en) | A kind of aluminium base trielement composite material and preparation method thereof | |
| CN111349251A (en) | Cellulose acrylic acid bentonite hydrogel with controllable mechanical property and preparation method thereof | |
| CN113430030B (en) | Decoking agent for boiler | |
| CN113816814A (en) | Preparation method of high-energy insensitive aluminum-containing explosive | |
| CN108695477B (en) | High-temperature-resistant large-aperture volcanic ash storage battery separator | |
| CN108218642B (en) | Heat-resistant anti-caking superfine ammonium nitrate and preparation method thereof | |
| CN115651267B (en) | Circulating water scale inhibitor | |
| CN116332709B (en) | Al/polyborane energetic composite material, preparation method and application | |
| CN113684077B (en) | Coal treatment method for reducing sulfur content in flue gas | |
| CN109184954B (en) | Auxiliary agent for reducing slow-speed roasting and burning response degree of solid engine | |
| CN110724349A (en) | Preparation method of ablation-resistant and scouring-resistant ethylene propylene diene monomer rubber heat-insulating material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |