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Classification of reaction kettle
Apr 07, 2020

1. According to the heating/cooling mode, it can be divided into electric heating, hot water heating, thermal oil circulating heating, far infrared heating, outer (inner) coil heating, jacket cooling and inner coil cooling. The choice of heating method mainly depends on the heating/cooling temperature required for the chemical reaction and the amount of heat required.


2, according to the kettle body material can be divided into carbon steel reactor, stainless steel reactor, lined glass reactor (enamel reactor) reactor, steel lining reactor.


2.1 carbon steel reaction kettle


Scope of application: environment without corrosive liquid, such as certain oil products processing.


2.2 stainless steel reaction kettle (KCFD series high-pressure reaction kettle)


Stainless steel reaction kettle


Stainless steel reaction kettle


1. Heating structure


Electric heating type, jacket type, outer half tube type, inner coil type, volume of 0.01m3 ~ 45m3


2, material


Carbon steel, stainless steel, high temperature resistant stainless steel, strong acid and alkali resistant stainless steel, enamel or PP material.


3. Mixing type


Slant type, anchor type, frame type, push type and single (double) screw type, and other types of blade can be designed and manufactured according to customer requirements [1].


Applicable scope: is suitable for the petroleum, chemical industry, medicine, metallurgy, scientific research, colleges and departments such as high temperature and high pressure chemical reaction experiment was carried out, and used to complete the hydrolysis, neutralization, crystallization, distillation, evaporation and storage, hydrogenated, alkylation, polymerization, condensation, heating mixed, thermostatic reaction process, such as the viscous and particles of the material can achieve high mixing effect.


2.3 glass lining reaction kettle


Applicable scope: widely used in petroleum, chemical, food, medicine, pesticide, scientific research and other industries.


2.4 steel lined PE reactor


Applicable scope: applicable to acids, bases, salts and most alcohols. Suitable for liquid food and medicine refining. It is an ideal replacement for rubber lining, FRP, stainless steel, titanium steel, enamel and plastic welded plate.


2.5 steel lined ETFE reactor


Scope of application: excellent anticorrosion performance, able to resist various concentrations of acid, alkali, salt, strong oxidants, organic compounds and all other highly corrosive chemical media.


3. According to the working internal pressure, it can be divided into atmospheric pressure reaction kettle, positive pressure reaction kettle and auxiliary pressure reaction kettle.


4. According to the mixing form, it can be divided into blade type, anchor type, frame type, spiral belt type, turbine type, dispersed disc type, combined type and so on.


5. According to the heat transfer structure, it can be divided into jacket type, outer half tube type, inner coil type and combined type.


Structure characteristics of reaction kettle


The reactor is composed of the body, lid, jacket, agitator, transmission device, shaft seal device and support. Mixing device in the high diameter is relatively large, the use of multi-layer mixing blade, can also be optional according to the user's requirements. A jacket is arranged outside the kettle wall, or a displacement heat surface is arranged inside the vessel. Heat exchange can also be carried out through an external cycle. The supporting seat has supporting type or ear type support. Gear reducer should be used when the speed exceeds 160. The number of holes, specification or other requirements can be designed and made according to the user's requirements.


1 usually in the atmospheric pressure or low pressure conditions with packing seal, the general use pressure is less than 2 kg.


2. Mechanical seals will be used in general medium pressure or vacuuming situations, the general pressure is negative pressure or 4 kg.


3. Under the condition of high pressure or high volatility of medium, magnetic seal will be used. The general pressure is more than 14 kg. In addition to the magnetic seal are water cooling, other seal forms more than 120 degrees above will increase the cooling water jacket.


Maintenance method of reaction kettle


(1) installation site: the reaction kettle should be installed in the high-voltage operation room that meets the explosion-proof requirements. When equipped with multiple reaction kettles, they should be placed separately. Each two of them should be separated by a safe explosion-proof wall.


(2) after opening the package, check whether there is any damage to the equipment. Install the equipment according to the model of the equipment according to the structure diagram, and check the equipped parts according to the packing list. Heating mode if the heat conduction oil heating, please according to use to purchase the corresponding models of heat conduction oil temperature (note: the heat conduction oil contains water) should never be allowed to join, join the jacketed refueling upper open clamp and the upper part of oil level in the mouth open, through to refuel refueling mouth flow of oil to oil level, oil level screw mouth to death after, not to screw die lest produce pressure filler.


(3) installation and sealing of kettle body and lid: Kettle body and kettle cover use gaskets or cone and circular arc line contact below, by mutual compression tighten the nuts to make them achieve good sealing effect, tighten the nut to be diagonal symmetrical gradually tighten the tension for many times, when the force uniform, do not allow the kettle lid tilted to one side, in order to achieve good sealing effect, when tighten the nut shall not exceed the prescribed tightening torque 40 ~ 120 n. M range, to prevent wear and sealing surface is crushed or overload sealing surface should be special to cherish, every time before you install the upper and lower sealing face with more soft paper or cloth to wipe clean, pay special attention to don't put the kettle body, kettle lid seal face with scars, If reasonable operation can be used for more than ten thousand times, after the sealing surface is damaged, it needs to be reprocessed and repaired to achieve good sealing performance. When removing the lid, the lid should be slowly lifted up and down to prevent the sealing surface between the body and the lid from colliding with each other. If the seal is gasket seal (ptfe, aluminum cushion, copper cushion, asbestos cushion, etc.), by tightening the main nut can achieve a good sealing effect.


(4) the installation of valve, pressure gauge and safety valve can achieve the sealing effect by tightening the positive and negative nuts. The arc sealing surface at both ends of the connection shall not rotate relatively. When assembling all the screw connection parts, it shall smear the graphite mixed with lubricant or oil to avoid death. Valve use: needle valve line seal, just gently turn the valve needle, pressure tight cover can achieve good sealing performance, do not force too much, so as not to damage the sealing surface.


(5) after the equipment is installed, enter a certain amount of nitrogen to keep pressure for 30 minutes to check whether there is any leakage. If there is any leakage, please use soap to find the leakage point of pipe and pipe mouth, and then release the gas and tighten it.


(6) when cooling, water can be used through the cooling coil for internal cooling, fast cooling is prohibited, to prevent excessive temperature difference stress, resulting in cooling coil, kettle body crack. When the temperature in the kettle exceeds 100℃, the water jacket between the magnetic agitator and the lid should be filled with cooling water to ensure that the water temperature is less than 35℃ to avoid demagnetization of magnetic steel.


(7) safety device: straight arch metal blasting disc, made of stainless steel, according to the national standard gb567-89 "arch metal blasting technical conditions" manufacturing, factory has been tested well, not to be adjusted at will. If the blasting has been carried out, it shall be replaced again. The time limit of replacement shall be determined by the using unit according to the actual situation of the unit. For those whose blasting pressure exceeds the nominal bursting pressure of the bursting disc but does not explode, it shall be replaced.


(8) after the reaction, first for cooling, and then the gas through the pipeline leakage within the kettle to outdoors, makes the pressure inside the kettle fell to atmospheric pressure, it is strictly prohibited to bring pressure to remove, then the main bolt, nut symmetrically to loosen, then carefully remove the kettle lid (or rising kettle lid) on the bracket, should pay special attention to in the process of unloading cover sealing surface protection.


(9) cleaning in the kettle: after each operation, clean the residue of the kettle body and sealing surface with cleaning fluid (use of the cleaning fluid should pay attention to avoid corrosion to the main material). Clean and keep clean, and do not allow cleaning with hard materials or rough surface items.


Principle of blade scraping machine


The working principle of the blade scraper is simple, is through the use of the blade scraper cutting surface, the object and material according to a point of proportion or width into a piece. For production or pharmaceutical or other purposes.


Different scraping machines also have different methods of slicing, for example, cells or tissues should be processed in the test, so that it is convenient to observe the experiment with a microscope. There are rotary and slide-out scraping machines for optical microscopes.


In the papermaking industry also need to use the blade scraper, suitable for the blade cutter, drum scraper, screw scraper, etc. The blade scraper is composed of a cutter disc, a housing, a feeding slot and a transmission device, etc. The working principle is to use a heavy cutter disc as a flywheel to stabilize slices.


Another is to cut polymer strips into particles. This requires a special blade scraper, which is composed of guide plate, feeding roller, pressure roller and rotary cutter. Working principle is: the use of the cutter plate by the stepless transmission transmission, feeding roller by the cutter plate through a group of transformation gear transmission, and the cutter plate according to the size of cutting a number of blades. Self - changing gear can change the cutting length and CVT can change the tape - in speed.


Use characteristics of scraper


(1) design compact independent control panel to effectively control all important operations.


(2) the control panel inside the body and the independent control panel are fully synchronized, and the LCD screen can prompt the total thickness of the slice and the total thickness of the slice, the thickness of the trim, the thickness of the slice, and the important operating status.


(3) five slicing modes: single, continuous, step, half blade, programming.


(4) the section speed is automatically adjusted according to the section thickness.


(5) repair function can be closed. In the automatic state, the parameters of the repair block are automatically adjusted, and in the manual state, the parameters of the repair block can be determined programmatically.


(6) slice thickness and trim thickness can be independently selected and stored.


(7) visual and audio signals indicate the limit of the advance and retreat and the remaining injection distance during injection.

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