RU2179759C2 - Method and installation for wet grinding of fuel pellets - Google Patents

Abstract

FIELD: nuclear engineering; production of nuclear fuel. SUBSTANCE: method includes use of centerless grinding machine for pellet treatment with lubricating and cooling fluid fed to grinding area where fuel pellets are loosely arranged. Distilled water used for the purpose is tangentially passed to grinding wheel between fuel pellet to be ground and grinding wheel in the form of finely dispersed spray. Speed of fuel pellet feed to grinding area and that of ground pellet extraction are coordinated. Then lubricating and cooling fluid is reconditioned and returned to process starting end for finishing and washing ground pellets. Grinding installation has centerless grinding machine with charging and discharging units, ground pellet washing unit, drying unit, fluid reconditioning system, and instrumentation inspection system. Grinding- machine charging unit is provided with automatic device for rolling over troughs holding sintered fuel pellets into bin incorporating vibrating duct for passing fuel pellets and shaking feeder. Unit for feeding fluid to grinding area is made in the form of sprayer whose axis is tangential to grinding wheel and to pellet being ground and perpendicular to their radii. Fluid reconditioning system is, essentially, closed loop including at least three settling bowls, pressure tank, and reconditioned-fluid return pumps communicating with sprayers for wetting the grinding wheel and washing the ground fuel pellets. All components of installation compose integrated process system for conveying, grinding, and inspecting fuel pellets capacities of all pieces of equipment incorporated in system being coordinated. EFFECT: enhanced quality of finished fuel pellets and increased yield. 7 cl, 3 dwg

Description

 The invention relates to the nuclear industry and may find application in enterprises manufacturing fuel tablets.

 An important characteristic of fuel pellets is their geometry, especially the diameter, surface of the pellets and their shape, since the large gap between the pellets and the shell dramatically affects the heat transfer between the fuel pellets and the shell, which leads to a significant increase in the temperature of the fuel pellets and, as a result, an increase in the number stored heat, which is especially dangerous in a nuclear reactor due to possible destruction of the shell and depressurization of the fuel element (TVEL). This becomes possible due to the ovality (ellipse) of the fuel pellets and because of the unpolished side surface of the fuel pellets (see Design, production and operation of fuel elements of power reactors. Book 1, F.G. Reshetnikov, Yu.K. Bibilashvili, I . S. Golovin et al. Edited by F. G. Reshetnikov, M., Energoatomizdat, 1995, pp. 88-89).

 The closest in technical essence and the achieved effect is the method of wet grinding of fuel pellets from uranium dioxide without hard fixing them with the base being treated surface of the fuel tablet on a centerless grinding machine with the supply of cutting fluid to the grinding zone, including the following operations: settings of the grinding machine, fuel supply tablets in the area of their grinding, wet grinding with the supply of cutting fluid in the grinding zone, the output of the fuel polished tablets from the grinding zone to the sink using cutting fluid, the supply of polished washed fuel pellets for drying (see Development, production and operation of fuel elements of power reactors. Book 1, F.G. Reshetnikov, Yu.K. Bibilashvili, I.S. Golovin et al., Edited by F.G. Reshetnikov. M., Energoatomizdat, 1995, pp. 101-102, 4.5).

 Water is used as a cutting fluid for wet grinding and for washing fuel pellets after grinding (see ibid. Book 1, p. 101).

 The disadvantages include the fact that water, as usual, contains impurities that can remain in the pores of the fuel pellet and cause the fuel pellet to be contaminated by impurities.

 Jet injection of cutting fluid - water into the grinding zone can change the position of the tablet in the grinding zone and cause it to become defective in shape.

 When wet grinding of fuel pellets, a large amount of liquid waste is formed containing suspensions of uranium dioxide, and their processing is required.

 The prevalence of the rate of injection of fuel pellets to grinding relative to the rate of withdrawal of fuel pellets after grinding can lead to uneven grinding of fuel pellets - marriage.

 There is also known a device for implementing the method - a centerless grinding machine containing a grinding wheel, a driving circle, upper and lower bearings, left and right cheeks for placing a fuel tablet between them before entering it into the grinding zone and the hydraulic system (see passport Semi-automatic circular grinding, universal ZU142MV ", manufactured by the company" Circle ", Ukraine, Kharkov).

 The well-known machine is a semiautomatic device and does not provide for automatic operation with a constant supply of fuel pellets with a certain speed to the grinding zone - the loading unit does not provide for this, the site for the regeneration of cutting fluid - water from suspensions of uranium dioxide powder is not provided, the loading vehicle is not provided polished tablets for washing tablets, washing and drying of tablets is not provided, adjustment of the left and right cheeks is not provided, which can lead to such defects, As receiving instead of a cylindrical surface of a polished fuel tablet pellets in the form of a "barrel", "waist", "stes", etc., there is no system for heating and maintaining the set oil temperature in the hydraulic system, which leads to a trend in the diameter of the tablets during the oil heating due to friction during rotation of the grinding wheel spindle. At the same time, the trend in tablet diameter is caused by thermal expansion of the grinding wheel spindle when the oil is heated. The machine does not have a turning system for the headstock of the driving circle in horizontal and vertical planes and a system for adjusting the turning angle, which does not exclude the rejection of tablets when grinding them.

 A device for implementing the method is known (see US Patent 416708 dated 09/11/1979, IPC B 24 V 005/22 and analogs of US patents: 2624985, 1953, 2720734, 1955, 2979869, 1961, 2990656, 1961, 3576189, 1971).

 Known devices partially eliminate the disadvantages of the machine ZU142MV.

 A well-known centerless grinding machine contains a grinding wheel, a driving wheel with a system for turning it, upper and lower supports, adjustable left and right cheeks to place a fuel tablet between them before entering it into the grinding zone, the loading and unloading unit, the hydraulic system and the instrument control system. It is known that fuel pellets after sintering in boats in a hydrogen furnace enter the grinding machine, respectively, in boats. The machine does not provide for the transfer of fuel pellets from boats to the unit feed to the grinder. Hence, the feed rate of fuel pellets for grinding relative to the output rate of grinding fuel pellets may not be maintained, and exceeding the feed rate can lead to slipping of fuel pellets above the upper support, and the excess of the output rate of fuel pellets over the feed rate of fuel pellets for grinding may result in rejection.

 There is no system for heating and maintaining the set oil temperature in the hydraulic system, which, like in the ZU142MB grinding machine, leads to a trend in the diameter of the fuel pellets during heating of the oil due to friction during rotation of the grinding wheel spindle. In this case, the trend of the diameter of the fuel pellet is caused by the thermal expansion of the grinding wheel spindle.

 The grinding machine provides for dry grinding of fuel pellets and there are no units for supplying cutting fluid to the grinding zone and there is no unit for washing fuel pellets. It is known that with dry grinding, fuel pellets are coated with a noticeable layer of dust; this dust absorbs up to 25% of the total moisture of the tablets, in addition, a large number of chips and cracks are formed on the fuel tablets, resulting in more rejects than when wet grinding (see Development, production and operation of fuel elements of energy reactors. Book 1, Ф .G. Reshetnikov, Yu.K. Bibilashvili, I.S. Golovnin and others, edited by F.G. Reshetnikov, M., Energoatomizdat, 1995, p. 101).

 The closest in technical essence and the achieved effect is the installation for implementing the method of wet grinding of fuel pellets, including a centerless grinding machine with a loading and unloading unit, grinding and driving wheels, upper and lower supports between the grinding and driving wheels, a lubricant-coolant supply unit a grinding zone, a vehicle for feeding polished tablets to a sink, a unit for washing tablets, a vehicle for feeding washed polished tablets to a dryer, a drying unit, a lubricant-cooling fluid purification system, and an instrument control system (see Development, production and operation of fuel elements of power reactors. Book 1, F.G. Reshetnikov, Yu.K. Bibilashvili, I.S. Golovnin, etc., edited by F.G. Reshetnikov, M., Energoatomizdat, 1995, pp. 101-102, 4.5).

 The installation for implementing the method of wet grinding of fuel pellets has the disadvantages of a known centerless grinding machine, i.e. in the installation, it does not provide for working with a constant feed rate for grinding fuel pellets and output of polished pellets, since it does not have a unit for converting the supply of fuel pellets from boats to the unit feed to the grinder, there is no system for heating and maintaining the set oil temperature in the hydraulic system, which leads to a trend in the diameter of the tablets during oil heating due to friction during rotation of the grinding wheel spindle.

 In addition, there is no system for adjusting the feed rate of fuel pellets from the loading unit to the grinding zone of fuel pellets and adjusting the output of polished pellets. The predominance of the input speed over the output speed of the fuel pellets leads to their slipping without grinding over the upper stop, and the predominance of the output speed over the input speed also leads to the marriage of tablets. The orientation of the cutting fluid supply unit to the grinding zone is also of great importance, since under the flow of cutting fluid - water, the position of the grinded fuel pellet may change and the latter can become defective. The quality of fuel pellets depends on the means of transporting polished tablets to the washing and drying unit.

 The quality of the polished tablets also depends on the lubricant-coolant supply system, since the absence of the latter transfers grinding to the category of dry grinding with a large number of chips and cracks (see ibid. Book 1, p. 101), and a high rate of fluid supply to the zone grinding leads to an increase in liquid waste, to a possible displacement of the fuel pellet in the grinding zone and to marriage.

 An object of the invention is to increase the yield of tablets and quality.

This technical problem is solved by the fact that in the method of wet grinding of fuel pellets without fixing them firmly with the base of the treated tablet pellet on a centerless grinding machine with the supply of cutting fluid to the grinding zone, which includes operations: adjusting the grinding machine, feeding the fuel pellets into their zone grinding, grinding, removing polished fuel pellets from the grinding zone to the sink using cutting fluid, feeding polished washed fuel tabs letok for drying, and cutting fluid for processing;
according to the invention, distilled water is used as a cutting fluid, which is introduced tangentially to the grinding wheel between the grinding fuel pellet and the grinding wheel in the form of a finely dispersed spray torch, the centerless grinding machine is set up using a fuel tablet simulator, the speed of feeding the fuel tablet into the grinding zone and the output rate of the polished tablet is consistent with each other; processing of the cutting fluid is carried out by at least three several times, and the clarified liquid phase of the cutting fluid is returned to the head of the process for grinding and washing fuel polished tablets.

This technical problem is solved in that in the installation for implementing the method of wet grinding of fuel pellets, including a centerless grinding machine with loading and unloading units, grinding and driving wheels, upper and lower supports between the grinding and driving wheels, adjustable left and right cheeks to accommodate the fuel tablets between them before entering it into the grinding zone, a unit for supplying cutting fluid to the grinding zone, a hydraulic system with oil, a vehicle for supplying polished fuel x tablet for washing, the washing assembly of ground fuel pellets, the vehicle fuel supply washed polished tablets in the drying unit, the drying unit polished fuel pellets purification system coolant and instrument control system;
according to the invention, the loading unit of the grinding machine is equipped with an automatic tilter of boats with sintered fuel pellets in a hopper with a vibrochannel for fuel pellets wiring, a vibratory feeder in communication with the vibrochannel and having a sensor for loading the vibrator feeder, a guiding channel for piecewise wiring of fuel pellets in the grinding zone and a discharge device from the beginning of the guide channel improperly oriented fuel pellets back to the vibrator,
the hydraulic system is equipped with a heating system and maintaining the set oil temperature in it, the lubricant-coolant supply unit to the grinding zone is made in the form of a nozzle, the axis of which is placed tangentially to the grinding wheel and to the grinding tablet perpendicular to their radii, the vehicle for transporting polished fuel tablets to the washing unit is made in the form of an inclined downward tray of piece-wiring of polished fuel pellets, the washing unit is made in the form of a nozzle-flushing device located above with a hole in the tray with the bottom drain, the vehicle for posting washed polished tablets after washing to the drying unit is made in the form of a conveyor belt running upward inclined elastic conveyor belt with cells for piece transportation of washed polished fuel tablets, placed inside the tray with the lower drain and the upper discharge into perforated boats and Rolling table for transporting boats with polished laundered fuel pellets to the drying unit, the cleaning system of the cutting fluid is made in the form of a closed of a clean circuit, including at least three sedimentation tanks, a pressure tank and pumps for returning cleaned cutting fluid to the irrigation nozzles of the grinding wheel and washing the fuel pellets after grinding, moreover, the automatic boat tilter, the vibro feed channel of the vibrator feeder with sintered fuel pellets, the piece feed vibrator sintered fuel pellets in the grinding zone of the machine, the supply and cleaning system of cutting fluid, the discharge unit of the grinding machine, the grinding unit fuel pellets, a vehicle for loading polished laundered fuel pellets into perforated drying boats and an instrument control system are made as a single technological complex for transporting, grinding and monitoring fuel pellets with the coordinated capacities of each piece of equipment.

Other differences are that:
- the lower drain of the polished tablet washing tray and the lower drain of the conveyor tilt upward tray are in communication with a closed lubricant-coolant cleaning circuit;
- conveyor elastic tape made of rubber;
- the first sump is made of a vertical type with a sediment collector of fuel material;
- the second sump is made of a horizontal type;
- the third sump is made of a vertical type with an overflow of clarified liquid into a pressure tank in communication with a pump for supplying a cleaned cutting fluid for grinding and washing tablets;
- the collection of sediment of the fuel material is made removable.

 In the method of wet grinding, the use of distilled water instead of water, as a cutting fluid, eliminates the rejection of polished fuel tablets by impurities.

 Entering the cutting fluid into the grinding zone of the fuel pellets tangentially to the grinding wheel and to the grinded fuel pellet perpendicular to their radii in the form of a finely dispersed spray torch will eliminate undesirable displacement of the fuel pellet relative to a given position, which will exclude marriage - it will improve the quality of the grinded fuel pellet.

 Setting up a grinding machine using a simulator will allow grinding of fuel pellets without rejecting fuel pellets at the time of adjustment.

 The agreed speed of introducing fuel pellets to grinding and withdrawal of fuel pellets after grinding will exclude the breakthrough of fuel pellets without grinding above the upper stop and getting defective.

 Threefold sediment of the cutting fluid will allow the suspension of uranium dioxide to be returned to the process, which will increase the yield of suitable tablets by eliminating the loss of uranium dioxide and reducing the consumption of cutting fluid due to its repeated use when returning to the process head.

 In the installation for the implementation of the method, the implementation of all nodes as a single technological complex for transportation, grinding and control of tablets with the agreed productivity of each piece of equipment will increase the yield of tablets and their quality.

 The supply of the grinding machine loading unit with an automatic tilter of boats with sintered fuel pellets into the hopper with a vibrochannel for sending them to a vibratory feeder having a vibratory feeder loading rate sensor directing the channel for piecewise fuel pellets to the grinding zone with a device for dumping incorrectly oriented pellets from the channel beginning to the vibratory feeder allows speed synchronization feeding tablets with a grinding speed that ensures the stability of the diameter of the tablets, eliminates the wrong but oriented fuel pellets into the grinding zone, their jamming, destruction, which will increase the yield and quality of the tablets.

 Providing a hydraulic system with an oil heating system and maintaining a predetermined temperature will eliminate the diameter of the tablets (trend), which will increase the yield and quality of the tablets.

 Execution in the form of a nozzle of a lubricant-cooling fluid supply unit with an axis placed tangentially to the grinding wheel and to the grinding tablet perpendicular to their radii will eliminate rejects by eliminating the displacement of the tablet from a predetermined position and increase the yield and quality.

 The implementation of the vehicle for posting the tablets after grinding to the sink in the form of an inclined tray with a nozzle for supplying distilled water will eliminate the damage to the tablets, since the latter were transported along the tray together with water and each tablet was washed separately, which would eliminate rejects and qualitatively wash every pill.

 The implementation of the vehicle for transporting the tablets for drying in the form of an upward inclined tray with a continuous conveyor belt inside with cells for each tablet will eliminate the marriage during transportation, remove water, moisture from the tablets by draining it down and apply the tablets for drying in high quality condition. Implementation of a system for cleaning the cutting fluid from suspensions of uranium dioxide by sedimentation tanks and the return of sediment to the process will reduce losses and increase the yield of tablets.

The drawings show a method for wet grinding of fuel tablets and an installation for its implementation, where
figure 1 - General view of the installation;
figure 2 - grinding wheel with a leading wheel (end view);
figure 3 - grinding wheel with a leading wheel (side view).

 Installation for implementing the method of wet grinding of fuel pellets includes a centerless grinder 1 with loading units 2 and unloading 3, grinding 4 and leading 5 circles, adjustable left 6 and right 7 cheeks, upper 8 and lower 9 supports for placing the fuel tablet 10 before entering it into the grinding zone 11, the lubricant-coolant supply unit 12 to the grinding zone 11, the hydraulic system 13 with oil, the vehicle 14 for feeding the fuel polished tablets 10 to the sink, the washing unit 15, the vehicle 16 for feeding were washed polished fuel pellets 10 in the drying unit, the drying unit 17, the grinding of fuel pellets 10, the system 18 clean coolant and instrument control system (not shown).

 The loading unit 2 of the grinding machine 1 is equipped with an automatic tilter 19 of the boats 20 with sintered fuel pellets 10 into the hopper 21 with a vibrochannel 22 of the fuel pellet wiring 10, a vibratory feeder 23 in communication with the vibrochannel 22 and having a sensor 24 of the degree of loading of the vibratory feeder 23, a directing channel 25 of the piece wiring of fuel pellets tablets 10 into the grinding zone 11 and the device 26 of the discharge from the beginning of the guide channel 25 of incorrectly oriented fuel tablets 10 back to the vibratory feeder 23. The hydraulic system 13 is equipped with a heating system 27 and holding 28 preset oil temperature. The unit 12 for supplying the cutting fluid to the grinding zone 11 is made in the form of a nozzle, the axis of which is placed tangentially to the grinding wheel 4 and to the grinding surface of the fuel tablet 10 perpendicular to their radii R and S, vehicle 14 for transporting polished fuel tablets 10 to the assembly 15 washing is made in the form of an inclined downward tray of piece wiring of fuel polished tablets, and the washing unit 15 is in the form of a shower nozzle device located above the hole in the tray 14 with a lower drain 29, the vehicle Your 16 postings of washed polished fuel pellets 10 after washing to the drying unit 17 are made in the form of an upward inclined transport elastic belt of conveyor with cells 30 for the piece transportation of washed polished fuel pellets 10 placed inside a tray 31 with a bottom drain 32 and top discharge into perforated boats 33, conveyor 34 transportation to the node 17 drying.

 The system for cleaning the cutting fluid is made in the form of a closed circuit, which includes at least three sedimentation tanks 35, 36, 37, a pressure tank 38 and an intermediate pump 39 and a pump 40 for returning the cleaned cutting fluid to the grinding wheel irrigation nozzles 12, 15 4 and washing the fuel pellets 10 after grinding.

 Automatic tilter of 19 boats 20, vibrochannel 22 of the hopper 21 of the vibrator feeder 23 loading with sintered fuel pellets 10, the vibratory feeder 23 of the piece feed of sintered fuel pellets 10 to the grinding zone of the machine 1, the lubricant-coolant supply and cleaning system, the grinding machine loading unit 2, the grinding machine 1, the assembly 15 sinks of polished fuel pellets 10, a vehicle 16 for supplying washed polished fuel pellets 10 to the perforated drying boats and the instrument control system are made as a single technological set The transportation, grinding and fuel control pill with the agreed production capacities of each piece of equipment.

 The lower drain 29 of the tray 14 washing polished fuel tablets 10 and the lower drain 32 of the tray 31 of the vehicle 16 are in communication with a closed loop for cleaning the cutting fluid. The conveyor elastic band of the vehicle 16 is made of rubber.

 The first sump 35 is made of a vertical type with a sediment collector 41 of the fuel material.

 The second sump 36 is made of a horizontal type.

 The third sump 37 is made of a vertical type with an overflow of clarified liquid into the pressure tank 38, in communication with the pump 40 return to grinding and washing the fuel polished tablets.

 Collection 41 sediment made removable.

 The method of wet grinding of fuel tablets is as follows.

 Previously, before starting work, the centerless grinding machine 1 is set up according to the fuel pellet simulator 10, for which the left and right cheeks 6, 7 are adjusted using the simulator, they are fixed, the upper and lower supports 8, 9 are fixed and fixed, and the turn in horizontal and vertical planes of the driving circle 5. Turning in the vertical plane gives translational movement to the tablets, and turning in the horizontal plane allows grinding of tablets with an allowance of up to 0.25 in diameter mm

 The heating system 27 of the oil in the hydraulic system 13 is turned on, the set temperature of the oil in the hydraulic system 13 is maintained using the system 28. The nozzle 12 for supplying the cutting fluid is adjusted and fixed so that the spray of the finely dispersed torch is placed along the nozzle axis tangent to the grinding wheel 4 and to a fuel tablet 10. As a cutting fluid, distilled water purified from impurities is used.

 The loading unit 2 is adjusted so that the feed rate of the fuel pellets 10 to the grinding zone 11 does not exceed the output rate of the polished tablets 10 from the unloading unit 3. When setting up the loading unit 2, the feed rate in the boats 20 of the sintered tablets 10, the tipping speed of the automatic tilter 19 of the boats into the hopper 21, the feed rate of the fuel pellets 10 through the vibration channel 22 to the vibratory feeder and from the vibratory feeder 23 along the guide channel 25 to the grinding zone 11 are adjusted. If the level of the fuel pellets 10 in the vibratory feeder 23 is exceeded, the sensor 24 will turn off the vibratory feeder 23. If the incorrectly oriented pellet arrives at the beginning of the channel 25, for example, its vertical position, then when the fuel pellet 10 moves and touches the reset device 26, the fuel pellet 10 from the stream vibratory feeder 23 will fall to its bottom and, thus, the introduction of incorrectly oriented fuel pellets into the guide channel is excluded.

 After grinding, the fuel tablet 10 enters the vehicle - a downwardly inclined tray 14, where it is washed with distilled water from the nozzle 15 and rolls down with the water down the tray. Through the bottom drain 29, the washed fuel polished tablets 10 enter the cell 30 of the vehicle in the form of an conveyor elastic conveyor belt inclined upwardly located inside the tray 31. Through the bottom drain 32, distilled water flows for cleaning, and the tablets 10 are individually transported and discharged into the cells 30 to perforated boats 33, which are sent along the rolling table 34 to the drying unit 17, where they are dried in a nitrogen medium, and the cutting fluid - distilled water after grinding and washing enters the system 18 o'clock sewage, where it is sedimented in a vertical settling tank, the sediment is collected in a removable collector 41 and discharged from the system, and clarified liquid enters the horizontal settling tank 36, clarified liquid from the settling tank 36 with a pump 39 enters the vertical settling tank 37, from where the clarified liquid through the pressure tank 38 pump 40 returns to grinding and washing fuel pellets.

 Tests of the method of wet grinding of fuel pellets and installation for its implementation have confirmed their positive effect.

Claims (7)

 1. The method of wet grinding of fuel pellets without rigidly fixing them with the base to be treated surface of the fuel pellet on a centerless grinding machine with the supply of cutting fluid to the grinding zone, including operations for setting up the grinding machine, feeding fuel pellets to the grinding zone, withdrawing polished fuel pellets from the zone grinding for washing with the use of cutting fluid, supply of polished washed fuel tablets for drying, and cutting fluid for the break Work, characterized in that distilled water is used as a cutting fluid, which is introduced tangentially to the grinding wheel between the grinding fuel tablet and the grinding wheel in the form of a finely dispersed spray torch, the grinding machine is set up according to the fuel tablet simulator, the fuel tablet feed speed is the grinding zone and the speed of withdrawal of the polished fuel pellets from the grinding zone are coordinated with each other, I process the cutting fluid At least threefold sludge and clarified metalworking fluid recycled to the head of the process for grinding and cleaning fuel polished tablets.  2. Installation for implementing the method of wet grinding of fuel pellets, including a centerless grinder with loading and unloading units, a grinding and driving wheels, upper and lower supports between the grinding and driving wheels, adjustable by the left and right cheeks to place the fuel tablet between them before entering it to the grinding zone, by the lubricant-coolant supply unit to the grinding zone, by a hydraulic system with oil, a vehicle for supplying fuel polished tablets to the sink, the washing unit is polished fuel tablets, a vehicle for feeding washed polished fuel tablets to a drying unit, a drying unit for polished washed fuel tablets, a lubricant-coolant cleaning system and an instrument control system, characterized in that the grinding machine loading unit is equipped with an automatic boat tilter with sintered fuel tablets in hopper with a vibrochannel for fuel pellets wiring, a vibratory feeder in communication with a vibrochannel and having a vibratory feeder loading degree sensor, a channel guide m piece-by-piece wiring of fuel pellets to the grinding zone with a device for dumping incorrectly oriented fuel pellets from the beginning of the guide channel back to the vibrating feeder, the hydraulic system is equipped with a heating system and maintaining the set oil temperature in it, the lubricant-coolant supply unit to the grinding zone is made in the form of a nozzle, axis which is placed tangentially to the grinding wheel and to the grinding tablet perpendicular to their radii, a vehicle for transporting polished fuel tablets to the washing unit is made in the form of an inclined downward tray of piece-wiring of polished fuel pellets, and the washing unit is in the form of a nozzle-flushing device located above the hole in the tray with the lower drain, the vehicle for sending washed polished fuel tablets after washing to the drying unit is made in in the form of an upward inclined conveyor continuous elastic conveyor belt with unit cells for washing washed polished fuel pellets placed inside a tray with a lower discharge and an upper discharge in perforated boats and the conveyor table for transporting boats with polished laundered fuel pellets to the drying unit, the lubricant-coolant cleaning system is made in the form of a closed circuit, which includes at least three sedimentation tanks, a pressure tank and pumps for returning the purified lubricant-coolant to the grinding irrigation nozzles circle and washing fuel pellets after grinding, with automatic boat tilter, vibro feed hopper vibro feeder sintered fuel pellets, vibropi a unit for supplying sintered fuel pellets by piece to the grinding zone of the machine, a lubricant-coolant supply and purification system, a grinder unloading unit, a polished fuel pellets washing unit, a vehicle for loading polished washed fuel pellets into perforated drying boats and an instrument control system technological complex for transportation, grinding and control of fuel pellets with the agreed performance of each piece of equipment.  3. Installation according to claim 2, characterized in that the lower drain of the polished fuel pellets sink and the lower drain of the conveyor tilt upward are connected with a closed lubricant-coolant cleaning circuit.  4. Installation according to claim 2, characterized in that the first settler is made of a vertical type with a sediment collector of fuel material.  5. Installation according to claim 2, characterized in that the second sump is made of a horizontal type.  6. Installation according to claim 2, characterized in that the third sump is of a vertical type with overflow of clarified liquid into a pressure tank in communication with a pump for supplying cleaned cutting fluid for grinding and washing tablets.  7. Installation according to claim 2, characterized in that the conveyor elastic tape is made of rubber.

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