A microwave drying device in a barrel for treating low-radioactive suspension

Abstract

The present invention belongs to the technical field of radioactive waste liquid treatment and disposal, and specifically relates to a microwave drying device in a barrel for treating low-radioactive suspension. A dilute acid pipeline is arranged at the inlet of the cyclone, a flow meter is arranged on the outlet pipeline at the bottom of the cyclone, a feed trough is connected at the outlet pipeline of the flow meter, a stirring paddle A is installed in the feed trough, driven by a stirring motor A, a liquid level meter A and a solid-liquid ratio measuring instrument are installed on the feed trough, a feed pump is connected to the outlet pipeline of the feed trough, the outlet of the feed pump is connected to a metering tank, a stirring paddle B is installed in the metering tank, driven by a stirring motor B, and a liquid level meter B is installed on the metering tank; a standard waste barrel enters a shielding box through a roller conveyor; a barrel clamping arm is arranged outside the standard waste barrel, and a lifting platform is arranged at the bottom of the standard waste barrel; the metering tank is connected to the metering pump. The present invention is of great significance for solving the bottleneck problems of low-level radioactive sludge, tank bottom mud, scale residue, etc. in the process of radioactive waste treatment and decommissioning.

Description

Technical Field

[0001] The invention belongs to the technical field of radioactive waste liquid treatment and disposal, and in particular relates to a microwave drying device in a barrel for treating low-radioactive suspension liquid. Background Art

[0002] During the trial operation of the low-level waste treatment facility, it was found that the evaporation concentrate contained a large amount of scale deposited at the bottom of the storage tank to form a suspension. The solid particles were mainly calcium carbonate, calcium sulfate, magnesium hydroxide, etc., and the liquid components were mainly supersaturated calcium carbonate and calcium sulfate solutions. Due to the presence of a large number of solid particles in the suspension, the process of waste liquid transportation, sampling, air level measurement, remote transportation, etc. often caused failures, and even caused shutdowns, seriously affecting the operation of the facility.

[0003] Normally, cement solidification technology can be used to treat suspensions. However, since cement solidification increases volume, it does not conform to the principle of minimizing radioactive waste, and the excessive calcium and magnesium ions in the suspension have a serious impact on the performance of the cement solidified body, so the formula needs to be redeveloped. Therefore, it is necessary to develop a drying treatment technology with a relatively high volume reduction coefficient to solve the above problems. The microwave drying technology in barrels is a high volume reduction treatment method with the advantages of small footprint, simple process, easy operation, and minimized waste treatment. Therefore, it has gradually received attention from the radioactive waste treatment industry. The basic principle of barrel drying is that the water molecules in the wet material in the waste barrel are converted into secondary steam and discharged under the action of microwave energy, while the dried radioactive solid waste remains in the barrel and is disposed of after detection. Summary of the invention

[0004] The purpose of the present invention is to provide a microwave drying device in a barrel for treating low-level radioactive suspension, which is used for solid-liquid separation of concentrated liquid (suspension) during the evaporation and concentration process of low-level treated radioactive waste liquid, and drying treatment of the radioactive suspension after separation, which is of great significance for solving the "bottleneck" problems of low-level radioactive sludge, tank bottom mud, scale residue, etc. in the process of radioactive waste treatment and decommissioning.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A microwave drying device in a barrel for treating low-radioactive suspension, wherein a dilute acid pipeline is arranged at the inlet of a cyclone, a flow meter is arranged on the outlet pipeline at the bottom of the cyclone, a feed trough is connected at the outlet pipeline of the flow meter, a stirring paddle A is installed in the feed trough, driven by a stirring motor A, a liquid level meter A and a solid-liquid ratio measuring instrument are installed on the feed trough, a feed pump is connected to the outlet pipeline of the feed trough, an outlet of the feed pump is connected to a metering trough, a stirring paddle B is installed in the metering trough, driven by a stirring motor B, and a liquid level meter B is installed on the metering trough; a standard waste barrel enters a shielding box through a roller conveyor; a barrel clamping arm is arranged outside the standard waste barrel, and the standard waste barrel is A lifting platform is arranged at the bottom of the barrel; the metering tank is connected to the metering pump, and the outlet pipe of the metering pump passes through the shielding box and is connected to the filling cover; the microwave generator passes through the shielding box through the waveguide and is connected to the filling cover, the waste steam outlet pipeline in the standard waste barrel is connected from the filling cover, passes through the shielding box, and is then connected to the purification tower, the pipeline on the upper part of the purification tower is connected to the inlet of the condenser cooler, the outlet of the condenser cooler is connected to the vapor-liquid separator, the waste liquid pipeline of the vapor-liquid separator is connected to the ion exchange column, and the outlet pipeline of the ion exchange column is connected to the condensate tank; the condensate tank is equipped with a sampling valve, the vapor-liquid separator is connected to the filter, and the filter is connected to the vacuum pump.

[0007] During the preparation stage, the standard waste barrel passes through the roller conveyor and enters the shielding box. Under the action of the lifting platform and the barrel clamping arm, a sealed environment is formed inside the standard waste barrel. When in use, the radioactive concentrated liquid passes through the cyclone to complete solid-liquid separation. After separation, the clear liquid at the top outlet of the cyclone is de-cemented and solidified, and the suspended liquid at the bottom outlet of the cyclone flows into the feed tank. The flow rate of the suspended liquid at the bottom of the cyclone is read through the data of the flow meter. A dilute acid pipeline is set at the inlet of the cyclone for cleaning. During the process of receiving the concentrated liquid in the feed tank, the stirring paddle A is stirred under the drive of the stirring motor A, and the solid-liquid ratio measuring instrument is observed at the same time until the suspension is stirred evenly. Under the action of the feeding pump, the suspended liquid in the feed tank is transported to the metering tank in batches. Under the drive of the stirring motor B, the stirring paddle B stirs the transported concentrated liquid evenly, and at the same time, the liquid level of the metering tank is read by the liquid level meter B. Under the action of the metering pump, the concentrated liquid in the metering tank is added to the standard waste barrel in batches. The microwave energy of the microwave generator passes through the waveguide and then passes through the shielding The box and the filling cover are used to heat the concentrated liquid inside the standard waste barrel, so as to achieve the drying of the suspension; during the drying process of the concentrated liquid, the waste steam outlet pipeline in the standard waste barrel is connected from the filling cover, passes through the shielding box, and then connected to the purification tower to achieve the capture of droplets in the waste steam and return it to the standard waste barrel; the secondary steam condensate at the top of the purification tower is connected to the inlet of the condensation cooler to achieve the condensation of the secondary steam; the temperature of the vapor-liquid separator is controlled by circulating water; the waste liquid generated by the vapor-liquid separator enters the ion exchange column for purification, and then discharged to the condensate tank, and the waste liquid is discharged after being analyzed and tested to be qualified; the waste gas generated by the vapor-liquid separator is filtered by the gas filter under the action of the vacuum pump to achieve the discharge of tail gas; after the drying process is completed, the feeding is stopped, the microwave generator is turned off, the barrel clamping arm is loosened, the jacking platform is lowered, the shielding box is opened, the roller table is reversed, and the standard waste barrel is withdrawn; after sealing, the standard waste barrel is non-destructively measured, and then cemented and sent to the disposal site for disposal.

[0008] The beneficial effects achieved by the present invention are:

[0009] It can be widely used in the treatment of residues, scaling, precipitation and other sediments in low-level radioactive waste liquid during the temporary storage, transportation and treatment of radioactive waste liquid in the nuclear industry. It is of great significance to solve the bottleneck problems such as radioactive sludge, tank bottom mud, scaling and slag in the process of radioactive waste treatment and decommissioning.

[0010] It can effectively solve the key problem of separation and drying of scaling materials in the concentrated liquid of a certain facility, which is of great significance for ensuring the normal operation of the facility production line; the radioactive concentrated liquid is subjected to solid-liquid separation by a cyclone, and the clear liquid after separation is temporarily stored and then cement solidified, while the radioactive suspension characterized by a mud-water mixture is subjected to microwave drying in a barrel, which not only solves the bottleneck problem affecting the production line, but also meets the principle of minimizing waste in the suspension treatment process; the whole set of equipment occupies a small area, is easy to operate, safe and reliable, and has a high degree of automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Schematic diagram of a microwave drying device in a barrel for treating low-radioactive suspension;

[0012] In the figure: 1-cyclone; 2-flow meter; 3-feeding tank; 4-stirring paddle A; 5-stirring motor A; 6-liquid level meter A; 7-solid-liquid ratio measuring instrument; 8-feeding pump; 9-metering tank; 10-stirring motor B; 11-stirring paddle B; 12-liquid level meter B; 13-metering pump; 14-microwave generator; 15-shielding box; 16-standard waste barrel; 17-barrel clamping arm; 18-filling cover; 19-lifting platform; 20-waveguide; 21-roller; 22-purification tower; 23-condensation cooler; 24-vapor-liquid separator; 25-ion exchange column; 26-condensate tank; 27-sampling valve; 28-gas filter; 29-vacuum pump. DETAILED DESCRIPTION

[0013] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0014] like Figure 1 As shown, the present invention includes a cyclone 1; a flow meter 2; a feed tank 3; a stirring paddle A4; a stirring motor A5; a liquid level meter A6; a solid-liquid ratio measuring instrument 7; a feed pump 8; a metering tank 9; a stirring motor B10; a stirring paddle B11; a liquid level meter B12; a metering pump 13; a microwave generator 14; a shielding box 15; a standard waste barrel 16; a barrel clamping arm 17; a filling cover 18; a lifting platform 19; a waveguide 20; a roller table 21; a purification tower 22; a condenser cooler 23; a vapor-liquid separator 24; an ion exchange column 25; a condensate tank 26; a sampling valve 27; a gas filter 28; and a vacuum pump 29.

[0015] The cyclone 1 is used to separate the radioactive concentrated liquid into solid and liquid. After separation, the clear liquid at the top outlet of the cyclone is de-cemented and solidified, and the suspension at the bottom outlet of the cyclone is dried by a subsequent microwave drying device in a barrel. A dilute acid pipeline is set at the inlet of the cyclone 1 for cleaning the equipment. A flow meter 2 is set on the bottom outlet pipeline of the cyclone 1 to measure the flow rate of the suspension. A feed tank 3 is connected to the outlet pipeline of the flow meter 2 to receive the suspension. A stirring paddle A4 is installed in the feed tank 3, which is driven by a stirring motor A5 to stir the suspension in the feed tank. A liquid level meter A6 and a solid-liquid ratio measuring instrument 7 are installed on the feed tank 3. Among them, the liquid level meter 6 is used to measure the liquid level of the feed tank, and the solid-liquid ratio measuring instrument 7 is used to measure the solid-liquid ratio of the suspension. A feed pump 8 is connected to the outlet pipeline of the feed tank 3, and the outlet of the feed pump 8 is connected to a metering tank 9. Under the action of the feed pump 8, the suspension in the feed tank 3 is transported to the metering tank 9 in batches. A stirring paddle B11 is installed in the metering tank 9, which is driven by a stirring motor B10 and is used to stir the suspension in the metering tank 9. A liquid level meter B12 is installed on the metering tank 9 and is used to measure the liquid level in the metering tank 9.

[0016] In the preparation stage, the standard waste barrel 16 passes through the roller conveyor 21 and enters the shielding box 15. A barrel clamping arm 17 is arranged outside the standard waste barrel 16, and a lifting platform 19 is arranged at the bottom of the standard waste barrel 16. Under the action of the lifting platform 19 and the barrel clamping arm 17, a sealed environment is formed inside the waste barrel. The metering tank 9 is connected to the metering pump 13, and the outlet pipe of the metering pump 13 passes through the shielding box 15 and is connected to the filling cover 18, and the suspension is added to the standard waste barrel 16 in batches. Among them, the shielding box 15 is used to shield the radioactive rays in the standard waste barrel 16. The microwave generator 14 passes through the shielding box 15 through the waveguide 20 and is connected to the filling cover 18, and microwave energy is fed back to the inside of the standard waste barrel 16 to achieve the drying of the suspension. The waste steam outlet pipeline in the standard waste barrel 16 is connected from the filling cover 18, passes through the shielding box 15, and is then connected to the purification tower 22 to capture the droplets in the waste steam and return it to the standard waste barrel 16. The pipeline at the top of the purification tower 22 is connected to the inlet of the condenser cooler 23 to realize the condensation of the secondary steam. Among them, the temperature of the vapor-liquid separator 24 is controlled by circulating water. The outlet of the condenser cooler 23 is connected to the vapor-liquid separator 24, and then connected to the vacuum pump 29. Under the action of the vacuum pump 29, the waste gas is treated. The waste liquid pipeline of the vapor-liquid separator 24 is connected to the ion exchange column 25 to realize the treatment of the waste liquid. The outlet pipeline of the ion exchange column 25 is connected to the condensate tank 26. The condensate tank 26 is equipped with a sampling valve 27 for sampling, thereby realizing the trough discharge function. The vapor-liquid separator 24 is connected to the filter 28, and the filter 28 is connected to the vacuum pump 29.

[0017] In the preparation stage, the standard waste barrel 16 passes through the roller conveyor 21 and enters the shielding box 15. Under the action of the lifting platform 19 and the barrel clamping arm 17, a sealed environment is formed inside the waste barrel.

[0018] When in use, the radioactive concentrated liquid passes through the cyclone 1 to complete solid-liquid separation. After separation, the clear liquid at the top outlet of the cyclone is de-cemented and solidified, and the suspension at the bottom outlet of the cyclone flows into the feed tank 3. The flow rate of the suspension at the bottom of the cyclone 1 can be read through the data of the flow meter 2. A dilute acid pipeline is set at the inlet of the cyclone 1 for cleaning. In the process of receiving the concentrated liquid in the feed tank 3, the stirring paddle A4 is stirred under the drive of the stirring motor A5, and the solid-liquid ratio measuring instrument 7 is observed at the same time until the suspension is stirred evenly.

[0019] Under the action of the feed pump 8, the suspension in the feed tank 3 is transported to the metering tank 9 in batches. Driven by the stirring motor B10, the stirring paddle B11 stirs the transported concentrated liquid evenly, and at the same time, the liquid level of the metering tank 9 is read by the liquid level meter B12. Under the action of the metering pump 13, the concentrated liquid in the metering tank 9 is added to the standard waste barrel 16 in batches. The microwave energy of the microwave generator 14 passes through the waveguide 20, and then passes through the shielding box 15 and the filling cover 18 to heat the concentrated liquid inside the standard waste barrel 16, thereby achieving the drying of the suspension.

[0020] During the drying process of the concentrated liquid, the waste steam outlet pipeline in the standard waste barrel 16 is connected from the filling cover 18, passes through the shielding box 15, and then connected to the purification tower 22 to capture the droplets in the waste steam and return it to the standard waste barrel 16. The secondary steam condensate at the top of the purification tower 22 is connected to the inlet of the condensation cooler 23 to condense the secondary steam. Among them, the temperature of the vapor-liquid separator 24 is controlled by circulating water.

[0021] The waste liquid generated by the gas-liquid separator 24 enters the ion exchange column 25 for purification, and then is discharged to the condensate tank 26. The waste liquid is discharged after being analyzed and tested. Among them, the sampling valve 27 is used for sampling. The waste gas generated by the gas-liquid separator 24 is filtered by the gas filter 28 under the action of the vacuum pump 29 to achieve the discharge of the tail gas system.

[0022] After the drying process is finished, the front end stops feeding, the microwave generator 14 is turned off, the barrel clamping arm 17 is loosened, the lifting platform 19 is lowered, the shielding box 15 is opened, the roller table 21 is reversed, and the standard waste barrel 16 is withdrawn. After the cover is sealed, the waste barrel is non-destructively measured, and then cemented and sent to the disposal site for disposal.

Claims

1. A microwave drying device in a barrel for treating low-radioactive suspension, characterized in that: A dilute acid pipeline is arranged at the inlet of the cyclone, a flow meter is arranged on the outlet pipeline at the bottom of the cyclone, a feed trough is connected to the outlet pipeline of the flow meter, a stirring paddle A is installed in the feed trough, driven by a stirring motor A, a level meter A and a solid-liquid ratio measuring instrument are installed on the feed trough, a feed pump is connected to the outlet pipeline of the feed trough, an outlet of the feed pump is connected to a metering trough, a stirring paddle B is installed in the metering trough, driven by a stirring motor B, a level meter B is installed on the metering trough; a standard waste barrel enters the shielding box through a roller conveyor; a barrel clamping arm is arranged outside the standard waste barrel, and a lifting platform is arranged at the bottom of the standard waste barrel; the metering trough is connected to the metering pump, and the outlet pipeline of the metering pump passes through the shielding box and is connected to the filling cover; a microwave generator passes through the shielding box through a waveguide and is connected to the Filling cover, the waste steam outlet pipeline in the standard waste barrel is connected from the filling cover, passes through the shielding box, and then connected to the purification tower. The pipeline on the top of the purification tower is connected to the inlet of the condenser cooler, the outlet of the condenser cooler is connected to the vapor-liquid separator, the waste liquid pipeline of the vapor-liquid separator is connected to the ion exchange column, and the outlet pipeline of the ion exchange column is connected to the condensate tank; the condensate tank is equipped with a sampling valve, the vapor-liquid separator is connected to the filter, and the filter is connected to the vacuum pump; in the preparation stage, the standard waste barrel enters the shielding box through a roller conveyor, and a sealed environment is formed inside the standard waste barrel under the action of the lifting platform and the barrel clamping arm; when in use, the radioactive concentrate is separated into solid and liquid through the cyclone, and the clear liquid at the top outlet of the cyclone after separation is de-cemented and solidified, and the cyclone The suspension at the bottom outlet of the cyclone flows into the feed tank; the flow rate of the suspension at the bottom of the cyclone is read through the data of the flow meter; a dilute acid pipeline is set at the inlet of the cyclone for cleaning; in the process of receiving the concentrated liquid in the feed tank, the stirring paddle A is stirred under the drive of the stirring motor A, and the solid-liquid ratio measuring instrument is observed at the same time until the suspension is stirred evenly; under the action of the feed pump, the suspension in the feed tank is transported to the metering tank in batches; under the drive of the stirring motor B, the stirring paddle B stirs the transported concentrated liquid evenly, and at the same time, the liquid level of the metering tank is read by the liquid level meter B; under the action of the metering pump, the concentrated liquid in the metering tank is added to the standard waste barrel in batches; the microwave energy of the microwave generator passes through the waveguide, and then passes through the shielding box and the adding The filling cover heats the concentrated liquid inside the standard waste barrel to achieve the drying of the suspension; during the drying process of the concentrated liquid, the waste steam outlet pipeline in the standard waste barrel is connected from the filling cover, passes through the shielding box, and then connected to the purification tower to capture the droplets in the waste steam and return it to the standard waste barrel; the secondary steam condensate at the top of the purification tower is connected to the inlet of the condensation cooler to achieve the condensation of the secondary steam; the temperature of the vapor-liquid separator is controlled by circulating water; the waste liquid generated by the vapor-liquid separator enters the ion exchange column for purification, and then discharged to the condensate tank, and the waste liquid is discharged after being analyzed and tested; the waste gas generated by the vapor-liquid separator is filtered by the gas filter under the action of the vacuum pump to achieve the discharge of tail gas; After the drying process is completed, the feeding is stopped, the microwave generator is turned off, the barrel clamping arm is released, the lifting platform is lowered, the shielding box is opened, the roller table is reversed, and the standard waste barrel is withdrawn; After sealing, the standard waste barrel is then non-destructively measured and then fixed with cement before being sent to a disposal site for disposal.

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