CN111056824A - Formula and preparation method of ready-to-use refractory mortar for electric power boiler - Google Patents
Formula and preparation method of ready-to-use refractory mortar for electric power boiler Download PDFInfo
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Abstract
The invention provides a ready-to-use refractory mortar formula for an electric power boiler and a preparation method thereof, wherein the ready-to-use refractory mortar formula comprises the following raw materials, by mass, 170-180 parts of calcined super-high bauxite 88 material, 7-9 parts of silica, 25-26 parts of phosphoric acid, 13-14 parts of bentonite, 6-7 parts of calcined α type alumina micropowder with the content of 99.8%, 2-2.5 parts of citric acid, 0.7-1 part of dye and 0.7-1 part of sodium pyrophosphate.
Description
Technical Field
The invention relates to refractory mortar, in particular to a ready-to-use refractory mortar formula for an electric power boiler and a preparation method thereof.
Background
In the thermal power generation production process, the coal-fired boiler is used for generating high-pressure steam to drive a steam turbine and even a generator to rotate to generate continuous electric energy, and meanwhile, the power plant boiler is also a main device for providing high-temperature high-pressure steam for industrial production and civil heating. In the construction process of the electric power boiler, the use of refractory materials (refractory castable) for furnace construction is an important link.
The pouring material is also called refractory pouring material, and is a mixture composed of refractory aggregate, binding agent and additive, and is mixed with water (or liquid binding agent) to form a pug which can be constructed by a pouring method. The refractory castable is different from other unshaped refractory materials in that the refractory castable has certain setting and hardening time after construction, so that the castable can be demoulded after certain time of curing after casting molding and can be put into baking for use after proper time of natural curing.
The castable is widely used for dense-phase regions of boiler hearths, material returning devices, hearth bottoms, superheaters, flues and other parts with excellent wear resistance, heat insulation and heat preservation performance. When the boiler operates, coal is burnt in a hearth to the highest degree, so that the high temperature of more than one thousand and five hundred degrees can be kept, the boiler operates under the long-time high-temperature working condition, the coal powder is continuously washed, and the boiler is frequently started and stopped under the stress influence, the boiler is seriously ablated and abraded on four pipes and a pouring material, the pouring material is abraded and falls off in different degrees, the exposed water wall pipe is seriously abraded, and even the pipe explosion can be caused, so that the equipment, the human body and the safe operation are greatly threatened, and the reason that the pouring material is required to be unfolded and maintained when the electric power boiler is stopped every time is also adopted.
The traditional repair construction method of the boiler castable is relatively complex and needs professional constructors to construct according to the construction process strictly. The specific methods are two types: the first method is to repair the materials by using the same castable, and the process is as follows: 1. firstly, supporting a firm template in a casting material falling area, 2, proportioning a plurality of refractory aggregates, powder, a bonding agent, a curing agent, water and the like according to a certain proportion, 3, fully stirring in a stirrer, 4, pouring the stirred slurry into the beaten template, fully compacting by using a vibrator, 5, naturally curing for one week, then removing the template, 6, and baking for two days according to a temperature rise coefficient until the casting material reaches a sintering state and the boiler is normally used. The second method is a plastic material repairing method, which is only used for the condition of small-area abrasion or falling off, and has the advantages that a template is not required to be supported, a furnace can be timely turned on after the repairing is finished, and various components forming the plastic material still need to be replaced; for example, aggregate, powder, curing agent, bonding agent and other raw materials of various specifications of refractory materials are fully mixed and stirred according to a certain proportion, and are used after being repeatedly kneaded for a certain time, the process is also extremely complex, any one of the raw materials is not easy to master, the using effect is greatly reduced, the problems of falling, cracking and the like are continuously generated, and the normal operation of the boiler is influenced, so that a professional manufacturer is generally required to maintain when the problems of castable occur in large, small and immediate maintenance of the boiler of a general power plant. Because the two materials have certain fluidity and poor plasticity, the materials are required to be quickly cured after construction, and 15-20% of refractory cement curing agent (which can be cured within one day generally) is added into the materials. The nature of power production is continuity, and if the repair time is too long, the enterprise benefit is seriously influenced.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provide a formula and a preparation method of ready-to-use refractory mortar for an electric power boiler, wherein the prepared product can be directly packaged into a finished product without sintering, can be stored for a long time without drying, and does not contain coagulants such as calcium aluminate cement, sodium hydroxide and the like.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a ready-to-use refractory mortar formula for an electric power boiler comprises, by mass, 180 parts of 170-180 parts of calcined super-high alumina bauxite, 7-9 parts of silica, 25-26 parts of phosphoric acid, 13-14 parts of bentonite (sodium bentonite), 6-7 parts of calcined α type alumina micropowder with the content of 99.8%, 2-2.5 parts of citric acid, 0.7-1 part of dye and 0.7-1 part of sodium pyrophosphate.
As an improvement, the calcined special-grade bauxite 88 material comprises 40-42 parts of calcined special-grade bauxite 88 material with the particle size of 3-5mm, 50-54 parts of calcined special-grade bauxite 88 material with the particle size of 1-3mm, 24-27 parts of calcined special-grade bauxite with the particle size of 0-1mm, 20-25 parts of calcined special-grade bauxite 88 material with the particle size of 200 meshes and 35-40 parts of calcined special-grade bauxite 88 material with the particle size of 325 meshes.
As an improvement, the phosphoric acid with the content of 85 percent is selected and added with clear water to prepare a phosphoric acid solution with the content of 75 percent.
As an improvement, the dye is ferric oxide blue.
A preparation process of a ready-to-use refractory mortar formula for an electric power boiler comprises the following specific steps:
1) weighing the raw materials according to the mass ratio;
2) adding 88 calcined super-high bauxite and silica with different fineness into a forced stirrer, stirring for 5-8 minutes, uniformly adding 12-14 parts of 75% phosphoric acid, continuously stirring for 15-20 minutes, and after completion, filling into a woven bag, and standing in a cool place for ageing for more than 24 hours;
3) after the ageing is finished, starting the grinder, gradually adding the ageing material into the grinder, then uniformly adding bentonite, calcined α type alumina micropowder with the content of 99.8%, citric acid, dye, sodium pyrophosphate and residual phosphoric acid in turn, and continuously mixing for 10-15 minutes until the materials are fully mixed to form the plastic pug;
4) after the material is mixed and ground, the mixture is poured into a production mold for molding, the mold is placed on a vibration platform to vibrate and compact, the square plasticine material embryo is molded, the square plasticine material embryo is placed into a plastic bag and then is boxed, and the plastic bag is stored in a cool and humid place.
As an improvement, 1-1.5 parts of clear water is used for the citric acid, and then the clear water is added into a grinder.
The invention has the beneficial effects that:
the product of the invention uses phosphoric acid and is fully aged, the phosphoric acid can remove iron in the refractory material, the stone is acidic in high-temperature environment, the proper proportion of the phosphoric acid added in the refractory material can play a role in preventing acidic medium corrosion, and has good resistance to S corrosion in fire coal, besides, the high-temperature expansion performance of the phosphoric acid can also partially resist the high-temperature shrinkage performance of the refractory material, citric acid is the best retarder in the refractory material, and can ensure that the product can keep plasticity for a long time, so that the quality guarantee time of the product is effectively prolonged, calcined α type alumina micropowder with the content of 99.8 percent has high-temperature stability, high hardness and alkali corrosion resistance, sodium bentonite not only plays a role of a bonding agent, but also is a plasticizer, and has great influence on the plasticity, the storage life, the construction performance and the high-temperature refractory performance of the refractory material, and sodium has the functions of a water reducing agent and a dispersing agent pyrophosphate.
The product is made by compacting and vibrating through a mould, is directly packaged into a finished product without sintering, is stored for a long time without drying, and has a longer storage period compared with other related refractory materials without adding coagulants such as calcium aluminate cement, sodium hydroxide and the like. The coloring agent (ferric oxide blue) improves the resolution of the product and the grade of the product on the premise of not influencing the product performance.
The finished product is several square plasticine blanks, and the unpacking usefulness is used, and the construction need not the support template, only need with the rubber hammer ramming can, use very simply, ordinary boiler overhaul workman (need not the refractory producer and send technical staff) can accomplish general repair, and the repair is accomplished, immediately plays the stove operation to for saving repair time greatly, improved power plant economic benefits. 2. The performances of abrasion resistance, corrosion resistance, thermal shock resistance, plasticity and the like of the finished product are greatly improved compared with those of the common refractory repair material. 3. Because the product is a plasticine-like block finished product, but not the fluidity of common casting materials, the plasticity and the convenience of the product are incomparable with those of common casting materials and plastic materials. 4. The product can be stored in a cool and humid place and can be normally used within half a year to one year (the castable and the plastic can be solidified within 24 hours). 5. The anti-abrasion beam can be constructed on the circulating fluidized bed boiler, so that the abrasion of the water wall pipe is effectively protected, and the service life can be up to 4 years.
Detailed Description
The invention is illustrated below by means of specific examples, without being restricted thereto.
Example one
The ready-to-use refractory mortar for electric power boiler consists of calcined super-high alumina powder 170 weight portions, silica 7 weight portions, phosphoric acid 25 weight portions, bentonite 13 weight portions, calcined α -type alumina powder 6 weight portions with content of 99.8%, citric acid 2 weight portions, dye 0.7 weight portions and sodium pyrophosphate 0.7 weight portions.
The calcined super-high bauxite 88 material comprises 40 parts of 3mm calcined super-high bauxite 88 material, 51 parts of 1mm calcined super-high bauxite 88 material, 24 parts of 0.5mm calcined super-high bauxite, 21 parts of 200-mesh calcined super-high bauxite 88 material and 34 parts of 325-mesh calcined super-high bauxite 88 material.
The phosphoric acid is 85% phosphoric acid and clear water is added to prepare 75% phosphoric acid solution.
The dye is iron oxide blue.
A preparation process of a ready-to-use refractory mortar formula for an electric power boiler comprises the following specific steps:
1) weighing the raw materials according to the mass ratio;
2) adding the calcined super-high bauxite 88 material with different fineness and silica into a forced stirrer, stirring for 5-8 minutes, uniformly adding 12 parts of 75% phosphoric acid, continuously stirring for 15 minutes, and after the stirring is finished, filling the mixture into a woven bag, and placing the woven bag in a shady and cool place for ageing materials in an air circulation place for more than 24 hours (properly prolonging in winter);
3) after the ageing is finished, starting the grinder, gradually adding the ageing material into the grinder, then uniformly adding bentonite, calcined α type alumina micropowder with the content of 99.8%, citric acid, dye, sodium pyrophosphate and residual phosphoric acid in sequence, and continuously grinding for 10 minutes until the materials are fully mixed to form the plastic pug, wherein the pug is kept at higher humidity so as to be convenient for long-term storage of the finished product material;
4) after the material is mixed and ejected, the mixed material is poured into a production mold for molding, the mold is placed on a vibration platform for vibration and compaction to complete molding into a square plasticine material embryo, and the square plasticine material embryo is loaded into a plastic bag and then is boxed.
The citric acid is dissolved by using 1 part of clear water and then added to a grinder.
Example two
The ready-to-use refractory mortar for electric power boiler consists of calcined super-high alumina 88 material 180 weight portions, silica-9 weight portions, phosphoric acid 26 weight portions, bentonite 14 weight portions, calcined α -type alumina powder with content of 99.8%, citric acid 2.5 weight portions, dye 1 weight portion and sodium pyrophosphate 1 weight portion.
The calcined special-grade high-alumina bauxite 88 material comprises 42 parts of 5mm calcined special-grade high-alumina bauxite 88 material, 53 parts of 3mm calcined special-grade high-alumina bauxite 88 material, 26 parts of 1mm calcined special-grade high-alumina bauxite, 23 parts of 200-mesh calcined special-grade high-alumina bauxite 88 material and 36 parts of 325-mesh calcined special-grade high-alumina bauxite 88 material.
The phosphoric acid is 85% phosphoric acid and clear water is added to prepare 75% phosphoric acid solution.
The dye is iron oxide blue.
A preparation process of a ready-to-use refractory mortar formula for an electric power boiler comprises the following specific steps:
1) weighing the raw materials according to the mass ratio;
2) adding the calcined super-high bauxite 88 material with different fineness and silica into a forced stirrer, stirring for-8 minutes, uniformly adding-14 parts of 75% phosphoric acid, continuously stirring for 20 minutes, and after the stirring is finished, filling the mixture into a woven bag, and placing the woven bag in a shady and cool place for ageing at an air circulation place for more than 24 hours (properly prolonging in winter);
3) after the ageing is finished, starting the grinder, gradually adding the ageing material into the grinder, then uniformly adding bentonite, calcined α -type alumina micropowder with the content of 99.8%, citric acid, dye, sodium pyrophosphate and residual phosphoric acid in sequence, and continuously mixing for 15 minutes until the materials are fully mixed to form a plastic pug, wherein the pug is kept at a higher humidity so as to be convenient for long-term storage of the finished product material;
4) after the material is mixed and ejected, the mixed material is poured into a production mold for molding, the mold is placed on a vibration platform for vibration and compaction to complete molding into a square plasticine material embryo, and the square plasticine material embryo is loaded into a plastic bag and then is boxed.
The citric acid is dissolved by using 1.5 parts of clear water and then added to a grinder.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. The ready-to-use refractory mortar formula for the electric power boiler is characterized by comprising, by mass, 180 parts of 170-180 parts of calcined super-high bauxite 88 material, 7-9 parts of silica, 25-26 parts of phosphoric acid, 13-14 parts of bentonite, 6-7 parts of calcined α type alumina micropowder with the content of 99.8%, 2-2.5 parts of citric acid, 0.7-1 part of dye and 0.7-1 part of sodium pyrophosphate.
2. The ready-to-use refractory mortar formulation for electric boilers as recited in claim 1, wherein the calcined super-high bauxite 88 material comprises 40-42 parts of calcined super-high bauxite 88 material of 3-5mm, 50-54 parts of calcined super-high bauxite 88 material of 1-3mm, 24-27 parts of calcined super-high bauxite of 0-1mm, 20-25 parts of calcined super-high bauxite 88 material of 200 mesh and 35-40 parts of calcined super-high bauxite 88 material of 325 mesh.
3. The ready-to-use refractory mortar formula for electric boilers as claimed in claim 1, wherein the phosphoric acid is 85% phosphoric acid and is added with clear water to prepare a 75% phosphoric acid solution.
4. The ready-to-use refractory mortar formulation for electric boilers according to claim 1, wherein the dye is iron oxide blue.
5. A preparation process of a ready-to-use refractory mortar formula for an electric power boiler is characterized by comprising the following specific steps of:
1) weighing the raw materials according to the mass ratio;
2) adding 88 calcined super-high bauxite and silica with different fineness into a forced stirrer, stirring for 5-8 minutes, uniformly adding 12-14 parts of 75% phosphoric acid, continuously stirring for 15-20 minutes, and after completion, filling into a woven bag, and standing in a cool place for ageing for more than 24 hours;
3) after the ageing is finished, starting the grinder, gradually adding the ageing material into the grinder, then uniformly adding bentonite, calcined α type alumina micropowder with the content of 99.8%, citric acid, dye, sodium pyrophosphate and residual phosphoric acid in turn, and continuously mixing for 10-15 minutes until the materials are fully mixed to form the plastic pug;
4) after the material is mixed and ejected, the mixed material is poured into a production mold for molding, the mold is placed on a vibration platform for vibration and compaction to complete molding into a square plasticine material embryo, and the square plasticine material embryo is loaded into a plastic bag and then is boxed.
6. The preparation process of the ready-to-use refractory mortar formula for the electric power boiler according to claim 5, wherein the citric acid is vitrified by using 1-1.5 parts of clear water and then added to a grinder.
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