Shandong used enamel reactor is containing high silica glass; lining the inner surface of the steel container; high temperature burning and firmly close the Shandong used enamel reactor to the metal surface
On becoming composite products. Therefore, it has stability and strength of glass metal double advantage, it is an excellent corrosion-resistant equipment. Has been widely used in chemical, petroleum, pharmaceutical, pesticide, food and other industries. In order to ensure Boring Glass normal use of equipment, now its main performance and installation, use precautions as follows:
. Glass-lined reactor is widely used in chemical, petroleum, pharmaceutical, pesticide, food and other industries in order to ensure the normal use of glass-lined equipment, now its main performance and installation, use Notes as follows:
1, the use of pressure: 0.2-0.4Mpa 2, acid resistance: a variety of organic acids, inorganic acids, organic solvents have good corrosion resistance, such as the glass-lined sample I plant is placed in a solution of 20% HCI boil 48h, the corrosion rate of 0.9lg / m2 d (Excellence in goods index was 1.0g / m2 d.) 3, alkali resistance: glass lined alkaline solution acid solution corrosion resistance is poor but my factory. . glass-lined sample is placed in 1N sodium hydroxide solution corrosion, test temperature is 80 ℃ time 48h corrosion rate of 6.76g / m2 d (Excellence in goods index was 7.0g / m2 d.) 4, operating temperature: glass-lined equipment When the heating and cooling should be slow I use glass-lined equipment manufacturing plant temperature 0-200 ℃, anxious denaturation temperature ≥200 ℃ 5, the porcelain layer thickness: thickness of the glass ceramic layer devices 0.8-2.0mm, sugar porcelain layer thickness of the glass equipment attachments 0.6-1.8mm 6, voltage electricity: glass lined with good insulation, when the thickness of the glass-lined within the prescribed high frequency spark examination 20KV porcelain layer, high-frequency electric spark can not hit ceramic wear layer 7, the impact resistance: The smaller the internal stress of the glass layer, the better, the larger the elastic hardness, the higher the flexural compressive strength, the better the impact resistance of the glass factory within a predetermined layer thickness. , with a diameter of 30mm, weight 112g ball at impact, the impact energy at 282 * 10-3J (Excellence in goods index is 260 * 10-3J).
Shandong used enamel reactor damage cause analysis
Enamel kettle is a high silicon content enamel is sprayed onto the surface of low carbon steel tire; after about 900 ℃ high temperature firing; make enamel steel tire adhesion to the metal surface and form; due to mechanical and physical properties of these two materials vary the same; therefore the damage causes the enamel kettle is also diverse; generally have the following reasons: (a) mechanical damage enamel is very poor impact resistance, any metal, hard object impact will be damaged and therefore cause enamel enamel kettle use. in to prevent any metal, hard object fall into the kettle, in case of blocking material, you must use plastic rods dredge, cover the lid overhaul to prevent melting slag pits or porcelain surface appear chipping. (b) thermal stress damage to the enamel kettle calcination at 900 ℃, cooled enamel and the steel sheet are bonded together. Because of the linear expansion coefficient of the enamel and elongation of less than steel, and therefore the amount of deformation after cooling is less than the amount of deformation of the glass-lined steel, enameled steel sheet produced by the constrained pressure stress after autoclave made of enamel, glass-lined i.e. its pre-compression stress exists, and there is pretensioned steel stress due to prestressing and associated with the linear expansion coefficient of elongation, coefficient of linear expansion and elongation closely related with the temperature, So enamel kettle temperature stress affect a large enamel pot. If the result of temperature changes leaving the enamel production exceeds its use stress, enamel will be destroyed. Therefore enamel layer enamel kettle cold, hot blast, easily burst Porcelain enamel kettle therefore have temperature limitations: temperature 200 ℃, temperature CML: cold shock (110 ℃, thermal shock (120 ℃ when the temperature of the feed material and autoclave when the temperature difference is too large and too Meng steam heating, cooling too fast. It can also lead to chipping. Therefore liter enamel kettle in use, cooling slowly and evenly, grading cooling. (c) Processing stress damage in the kettle process, due to the roll, stamping, welding a large amount of internal stress, these stress before enamel should be thoroughly eliminated, such as not completely eliminate lead to enamel chipping. Such damage often occurs in the first three months after it is put. so the embryo heat treatment or aging treatment to prevent chipping. (iv) stir the liquid, suspension and strong enamel friction with suspended solids within the static puncture enamel kettle, while the suspension itself create friction, thus creating a lot of static charge, high electrostatic charge on the enamel puncture a strong role, thus cause enamel pitting, thus stirring speed is not too fast (v) analysis of hydrogen corrosion enamel kettle jacket in use for some time scaling and rust; If you use an acidic cleaner to remove dirt or coolant jacket bias Suanxing; hydrogen evolution will lead to the occurrence of corrosion of metal (Fe + 2HCI = FeC12 + H2O part of the H atoms diffuse into the metal cavity; combined into a} b; 这些 H: Because of outward diffusion of dense enamel can no longer, so when Hz accumulation to a certain extent, the formation of a given power, the enamel will rupture. Therefore, when cleaning fouling pickling, must be added to the buffer, if enamel kettle of higher value or not easily replaced or even perforation corrosion, it must Corrosion rate use high-quality cleaning agents, to avoid the serious consequences caused by improper cleaning operations, such as Fu World Tektronix cleaning agents can achieve extremely low corrosion under scale cleaning. (vi) substrate material failure to reduce costs, some manufacturers Replacement embryo adoption of Q235, a direct result of carbon steel, sugar burning sulfur in the gasification process, so that between the enamel layer and the substrate, forming a large number of bubbles inside the enamel layer, leading to enamel bond strength is reduced. In case of hot and cold enamel layer CML, pole explosive porcelain so enamel kettle choose carbonaceous, low sulfur steels do physical embryos prevent chipping. (vii) Boring burn some poor quality enamel kettle manufacturer production environment shabby, rust dust not up to standard, so that the bottom Glaze and substrate is not good. Some of reducing the number of passes to burn sugar, increased thickness of each layer, so that internal force is too large, the impact of enamel kettle life. Therefore, in strict accordance with the manufacturing procedures to ensure manufacturing quality enamel kettle.
Enamel kettle large enamel damage, we need to send the device to re-enamel factory, newly purchased cost about 1/4 of the small size of damage localized patches in the field. On-site fast repair, do not dismantle the device, simply open manhole to fix, 24 hours after the repair can be put into use. scene Putty epoxy, PTFE resin, high performance enamel Putty, etc., and are currently used polymer composites enamel Putty High molecular composite enamel scene Putty is made polymers, wear-resistant alloy powder or a ceramic powder as a base and with a two-component composite curing agent. Compared with ordinary resin type Putty, polymer composite the material on their own more detailed molecular structure, so that the material itself has a stronger adhesive force and excellent corrosion resistance, corrosion resistance, and even be able to penetrate the polymer to the metal inside, forming a tighter protection polymer composites layer polymer composite enamel scene Putty has a high chemical stability and good mechanical properties. use of polymer composites repair chemical enamel equipment, not only to save non-ferrous metals, and repair process is simple, low cost, short repair time , corrosion resistant, very discussion and promotion of value. Repair surface cleaning process ethanol cleaning rust → → → → Tu Tu bottom surface Putty Putty → curing → use.
Edit this paragraph common faults and maintenance program
Shandong used enamel reactor by shock and vibration and other composite impact force during operation, the metal component will generate 'hard-on-hard' relationship with time, some of the impact deformed into a permanent deformation, recovery stress decrease, a gap is formed, the final resulting in a relatively low hardness is worn parts, such as the most common: transmission part (bearing housing) wear, surface local damage, the reactor inlet wear, under wear spout reactor, the reactor inner wall of local damage, into the reactor hole damaged, broken connections and other parts of contemporary maintenance method for the failure latest multi-application polymer composite material having superior adhesion, excellent compressive strength and other comprehensive performance, free removal, free machining. relative to traditional method, the application of polymer materials is neither repair welding thermal stress on the repair thickness is not limited, while products with metallic materials do not have a concession, it can absorb the impact of vibration equipment, to avoid wear again at home against Shandong used enamel reactor failure of maintenance, gradually replacing the traditional approach. polymer composite repair Shandong used enamel reactor inner wall of the local damage
Enamel device with excellent performance acid and alkali resistance, impact resistance and temperature variations, etc., in the chemical, pharmaceutical, light industry equipment enamel has been widely used for many years, mainly in the industrial enamel reaction tank equipment and storage tanks dominated the last decade, with the development of ceramic industry, the structure of enamel products have some changes, there has been enamel tube heat exchangers, ceramic thin film evaporator and filters, etc. Because enamel equipment long period of high temperature, high pressure , corrosive media, as well as by rapid cooling during operation, rapid thermal effects, Shandong used enamel reactor equipment is easy enamel chipping phenomenon. parts of chipping is exposed after the metal substrate, due to aggressive media, the metal matrix corrosion, the continuity of production are carried out in many large chemical companies, and the application of large reactors, one reactor chipping phenomenon occurs, even if the area is very small, it may affect product quality and normal production of the whole plant, So to fix the problem and other crushing equipment enamel equipment aroused widespread attention. If we can find a simple, economical and reliable repair method, which has good economic for businesses. chipping can be divided into two forms, one is the so-called fishscale phenomenon caused by the hydrogen, another is chipping from the mechanical stress causes. These two chipping phenomenon may occur simultaneously, may also occur in isolation. fishscale caused by many factors, and including surface and internal quality billet, composition and uniformity of enamel and enamel firing process, such as skim concentration of sulfuric acid, the pickling time, enamel firing temperature and time. In addition fishscale phenomenon very strongly affected by seasonal effects. fishscale of formed mainly by absorbing hydrogen steel, diffusion, aggregation and overflow caused to the determination of a foreign country, when fishscale, pressure from the metal substrate precipitated gaseous hydrogen can be up to 11MPa. In the firing enamel equipment metal matrix, steel in austenitic state, great solubility of hydrogen, which can absorb a large amount of hydrogen produced in the firing process. steel during cooling will produce austenite to ferrite phase transformation, a metal matrix dissolved hydrogen a significant decline in the ability to precipitate hydrogen from steel billet and gathered on the junction of the enamel layer and internal defects of steel parts, with time, more and more high concentration of hydrogen, increasing pressure, when the pressure exceeds the mechanical strength of the ceramic layer, the ceramic layer will produce fishscale, From fishscale process analysis, organizational status enameled porcelain plate is to determine whether the explosion occurred in the internal and external factors only play a role in promoting internal change, These organizations macroscopic tissue, such as bubbles, shrinkage, cracks, etc., there microstructure, such as grain size, cementite shape, size, distribution, etc. enamel etching equipment damage, mostly due to the weld surface the enamel layer with different degrees of fishscale off porcelain caused because the weld metal microstructure of ferrite and pearlite. welding bubbles, shrinkage, cracks and other defects, hydrogen has a strong absorption. it should try to avoid body thermal processing. In addition, to prevent the generation of fishscale must also reduce the source of hydrogen, or hydrogen to provide a gathering space. When the temperature 800 ~ 900 ℃ burn sugar, water enamel inside The following reaction occurs with the metal Fe: Fe + H2O → FeO + 2H great influence on the hydrogen content of this billet, steel plate hydrogen evolution which is the most serious factor, therefore, when the product is fired, we must minimize enamel moisture content and the billet surface moisture adsorption, and firing moisture in the environment, thereby reducing the generation of hydrogen. stress chipping mainly due to huge differences in the thermal expansion coefficient of porcelain layer and metal body caused. In most case, the thermal expansion coefficient of the metal body porcelain layer is greater than the coefficient of thermal expansion, which means that at room temperature the porcelain layer there is always residual stress residual stress difference in thermal expansion coefficient, temperature, thickness of the glaze layer, the base material thickness, etc. Influencing Factors. glass-lined equipment thermal residual stress theoretical calculation. compressive stress porcelain layer is large enough, the ceramic layer will be peeled off. So in the design of the enamel, should make the thermal expansion coefficient of the enamel as close to the thermal expansion coefficient of the matrix, At the same time efforts to improve the adhesion matrix and ceramic layers, enamel and enamel adhesion ability is directly related to the wetting of metal. enamel glaze melt and the wettability of stronger metals, more conducive to painting and firing interface attract each other, to accelerate the chemical reaction to form a chemical bond, to enhance adhesion. Also the porcelain layer is usually uneven, generally containing inclusions, which is characterized in enamelling process, since the glaze frit and a mill addition was mixed with sugar added, etc. Cheng, and the final baking time constraints by, which hinder the vitreous completely homogenized. In general, these additional particles and bubbles is the cause of stress, and it is a pioneer in the porcelain layer cracks, even though the strength of the enamel is reduced, will leads to various defects. enamel (glass-lined reactor) surface is hard and brittle, low mechanical strength, surface hardness is relatively large, the effect of impact forces i.e. broken line. In the transport apparatus, during installation, removal often results in the surface enamel porcelain phenomenon, resulting tank corrosion can not be used.