CN109876871B - Efficient resin unloading method for high-pressure ion exchange purification system - Google Patents
Efficient resin unloading method for high-pressure ion exchange purification system Download PDFInfo
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- CN109876871B CN109876871B CN201910245102.2A CN201910245102A CN109876871B CN 109876871 B CN109876871 B CN 109876871B CN 201910245102 A CN201910245102 A CN 201910245102A CN 109876871 B CN109876871 B CN 109876871B
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Abstract
The invention belongs to the technical field of reactor primary loop water treatment, and particularly relates to a high-efficiency resin unloading method for a high-pressure ion exchange purification system. The invention comprises the following steps: step 1, constructing a loop ion exchange purification system; step 2, replacing the boric acid in the ion exchange bed into a water tank of a boron recovery system; step 3, performing pressure air loosening on hardened resin in the ion exchange bed at different liquid levels; and 4, leading out the loosened resin in the ion exchange bed. The invention can ensure that the hardened resin in the high-pressure environment can be effectively and quickly led out from the ion exchange bed at one time in a high-efficiency and quick manner under the condition of controlling the yield of the radioactive waste.
Description
Technical Field
The invention belongs to the technical field of reactor primary loop water treatment, and particularly relates to a high-efficiency resin unloading method for a high-pressure ion exchange purification system.
Background
The primary circuit purification system of the VVER-1000/428 type unit comprises: an array of cation exchangers, also known as cation beds, in which H is loaded+Cation resin for removing cationic impurities dissolved in coolant in primary circuit, anion exchanger, also called anion bed, in which OH is loaded-The type anion resin is used for removing anion impurities dissolved in the primary loop coolant to jointly maintain the chemical working condition of the primary loop water; an array of cation and anion exchangers, also known as mixed beds, in which H is loaded+Cationic resin and OH-The anionic resin is used for removing ionic impurities dissolved in the primary loop coolant and maintaining the chemical working condition of the primary loop water. Work of machine setDuring high-rate operation, the operating pressure of an ion exchange bed of a primary circuit purification system is 15.7MPa, the operating temperature is 55 ℃, hardening phenomenon of resin often occurs after long-term operation, and during material changing overhaul, the situation that the resin cannot be completely unloaded often occurs according to a normal resin unloading flow, and resin unloading operation needs to be executed for multiple times. The repeated resin unloading operation wastes manpower and material resources, influences the construction period of unit maintenance, increases the generation of radioactive waste liquid, improves the operation cost and is not beneficial to the minimum control of the radioactive waste.
Operation practice proves that the method for efficiently unloading the resin for operating the resin exchanger in the high-pressure environment of the reactor is provided, and through replacement of boric acid solution in the ion exchange bed in advance, the ion exchange bed is subjected to effective air-compressing loosening for many times under the condition that liquid levels in the ion exchange bed are different, hardened resin is scattered, and effective export of the follow-up resin is facilitated.
Disclosure of Invention
The technical problems solved by the invention are as follows:
the invention provides a high-efficiency resin unloading method for a high-pressure ion exchange purification system, which can ensure that hardened resin in a high-pressure environment can be effectively led out from an ion exchange bed at one time, efficiently and quickly under the condition of controlling the yield of radioactive waste.
The technical scheme adopted by the invention is as follows:
a method for high efficiency resin unloading for a high pressure ion exchange purification system comprising the steps of:
step 1, constructing a loop ion exchange purification system; step 2, replacing the boric acid in the ion exchange bed into a water tank of a boron recovery system; step 3, performing pressure air loosening on hardened resin in the ion exchange bed at different liquid levels; and 4, leading out the loosened resin in the ion exchange bed.
In the step 1, the loop ion exchange purification system comprises a valve A, a valve B, a valve C, a valve D, a valve E, a valve F, a valve G, a valve H, a valve I and an ion exchange bed.
The valve A is an ion exchange bed exhaust valve and is positioned between the ion exchange bed and an exhaust system; the valve B is positioned between the ion exchange bed and the purifying medium inlet; the valve D is positioned between the ion exchange bed and the waste resin receiving system; the valve C is positioned between the valve B and the valve D; the valve E is a demineralized water supply valve and is positioned between the ion exchange bed and the demineralized water supply system; the valve F is a pressure air supply valve and is positioned in the ion exchange bed and the pressure air supply system; the valve G is positioned between the ion exchange bed and the purifying medium outlet; a valve H water tank valve is positioned between the ion exchange bed and the boron recovery system; the valve I is a drain valve of the ion exchange bed and is positioned between the ion exchange bed and the drainage system.
The initial state before resin unloading is: all valves are in a closed state, the ion exchange bed is filled with boric acid, and the pressure is atmospheric pressure.
The step 2 comprises the following steps:
step 2.1: opening the ion exchange bed and discharging to a boron recovery system valve H;
step 2.2: and opening a valve E, adjusting the flow rate of the boron recovery system water tank to be acceptable, and introducing the boric acid in the ion exchange bed into the boron recovery system water tank by using demineralized water.
The step 3 comprises the following steps:
step 3.1: opening a valve E, and filling the ion exchange bed to be full of water;
step 3.2: opening the valve A;
step 3.3: opening a valve I, draining water by adopting static pressure, and monitoring the drainage amount I;
step 3.4: closing the valve I, filling compressed air into the ion exchange bed to a micro positive pressure, slightly opening the valve I, monitoring the water discharge amount II, and closing the valve I when the sum of the water discharge amount I and the water discharge amount II can meet the requirement that water is discharged to the upper part of the resin loading line within the range of 10-15 cm;
step 3.5: opening a valve F to loosen the plate-knot resin for 30 minutes, fully opening and fully closing the valve F for a plurality of times when the resin loosening is finished, and impacting the plate-knot resin;
step 3.6: and repeating the step 3.1-3.5 twice, wherein the valve I is closed when the water discharge is increased to be within the range of 10-15cm below the resin loading line for the first time, and the valve I is closed when the water discharge is increased to be within the range of 30-35cm below the resin loading line for the second time.
The step 4 comprises the following steps:
step 4.1: opening a valve D;
step 4.2: and opening the valve E and the valve F to adjust the flow and pressure of the desalted water and the compressed air, and ensuring the loosened resin to be smoothly led out.
The invention has the beneficial effects that:
(1) according to the high-efficiency resin unloading method for the high-pressure ion exchange purification system, boric acid is recovered by replacing boric acid solution in the ion exchange bed, and the amount of radioactive solid waste generated by subsequent cement solidification is reduced;
(2) according to the efficient resin unloading method for the high-pressure ion exchange purification system, the hardened resin is scattered by performing compressed air loosening on three different liquid levels in the ion exchange bed, so that the subsequent resin can be effectively led out conveniently;
(3) according to the high-efficiency resin unloading method for the high-pressure ion exchange purification system, the ion exchange bed is pressurized through the air compression, so that the drainage time is saved, and the effective control of the liquid level in the resin window is facilitated;
(4) the efficient resin unloading method for the reactor primary circuit high-pressure resin purification system successfully solves the problem that hardened resin under high-pressure operation is effectively and quickly led out of an ion exchange bed under the condition of controlling the yield of radioactive waste in the operation process, reduces the yield of the radioactive waste, and improves economic benefits.
Drawings
FIG. 1 is a circuit ion exchange purification system
In the figure: 1-valve a; 2-valve B; 3-valve C; 4-valve D; 5-valve E; 6-valve F; 7-valve G; 8-valve H; 9-valve I; 10-ion exchange bed.
Detailed Description
The high-efficiency resin unloading method for high-pressure ion exchange purification system provided by the invention is further described in detail with reference to the accompanying drawings and specific examples.
As shown in FIG. 1, the present invention provides a high-efficiency resin unloading method for a high-pressure ion exchange purification system, which comprises the following steps:
step 1, constructing a loop ion exchange purification system
Comprises a valve A1, a valve B2, a valve C3, a valve D4, a valve E5, a valve F6, a valve G7, a valve H8, a valve I9 and an ion exchange bed 10; wherein, the valve A1 is an ion exchange bed exhaust valve and is positioned between the ion exchange bed 10 and the exhaust system; valve B2 is located between the ion exchange bed 10 and the purification media inlet; valve D4 is located between the ion exchange bed 10 and the waste resin receiving system; valve C3 is located between valve B2 and valve D4; the valve E5 is a demineralized water supply valve located between the ion exchange bed 10 and the demineralized water supply system; the valve F6 is a pressure air supply valve, and is located between the ion exchange bed 10 and the pressure air supply system; valve G7 is located between the ion exchange bed 10 and the purification media outlet; a valve H8 water tank valve located between the ion exchange bed 10 and the boron recovery system; valve I9 is an ion exchange bed drain valve, located between the ion exchange bed 10 and the drainage system, and the initial state before resin unloading is: all valves are in a closed state, and the ion exchange bed 10 is filled with boric acid under atmospheric pressure.
Step 2, replacing the boric acid in the ion exchange bed to a water tank of a boron recovery system
Step 2.1: opening the ion exchange bed and discharging to a boron recovery system valve H8;
step 2.2: and opening a valve E5, adjusting the flow rate of the water tank of the boron recovery system to be acceptable, and introducing the boric acid in the ion exchange bed into the water tank of the boron recovery system by using demineralized water.
Step 3, performing pressure air loosening on hardened resin in the ion exchange bed at different liquid levels
Step 3.1: opening valve E5, filling ion exchange bed 10 to full water;
step 3.2: opening valve a 1;
step 3.3: opening a valve I9, draining water by adopting static pressure, and monitoring the drainage amount I;
step 3.4: closing a valve I9, filling compressed air into the ion exchange bed 10 to slight positive pressure, slightly opening a valve I9, monitoring the water discharge amount II, and closing a valve I9 when the sum of the water discharge amount I and the water discharge amount II can meet the requirement that water is discharged to the upper part of the resin loading line within the range of 10-15 cm;
step 3.5: opening a valve F6 to loosen the plate-knot resin for 30 minutes, and fully opening a fully-closed valve F6 for several times to impact the plate-knot resin when the resin is loosened;
step 3.6: repeating the steps 3.1-3.5 twice, wherein the valve I9 is closed when the water discharge amount is increased to be within the range of 10-15cm below the resin loading line for the first time, and the valve I9 is closed when the water discharge amount is increased to be within the range of 30-35cm below the resin loading line for the second time.
Step 4, leading out the loosened resin in the ion exchange bed
Step 4.1: opening valve D4;
step 4.2: and opening a valve E5 and a valve F6 to adjust the flow and pressure of the desalted water and the compressed air so as to ensure the smooth discharge of the loosened resin.
Claims (2)
1. A method for efficient resin unloading for a high pressure ion exchange purification system, comprising: the method comprises the following steps:
step 1, constructing a loop ion exchange purification system; step 2, replacing the boric acid in the ion exchange bed into a water tank of a boron recovery system; step 3, performing pressure air loosening on hardened resin in the ion exchange bed at different liquid levels; step 4, leading out the loosened resin in the ion exchange bed;
in the step 1, the loop ion exchange purification system comprises a valve A, a valve B, a valve C, a valve D, a valve E, a valve F, a valve G, a valve H, a valve I and an ion exchange bed;
the valve A is an ion exchange bed exhaust valve and is positioned between the ion exchange bed and an exhaust system; the valve B is positioned between the ion exchange bed and the purifying medium inlet; the valve D is positioned between the ion exchange bed and the waste resin receiving system; the valve C is positioned between the valve B and the valve D; the valve E is a demineralized water supply valve and is positioned between the ion exchange bed and the demineralized water supply system; the valve F is a pressure air supply valve and is positioned in the ion exchange bed and the pressure air supply system; the valve G is positioned between the ion exchange bed and the purifying medium outlet; a valve H water tank valve is positioned between the ion exchange bed and the boron recovery system; the valve I is a drain valve of the ion exchange bed and is positioned between the ion exchange bed and the drainage system;
the step 2 comprises the following steps:
step 2.1: opening the ion exchange bed and discharging to a boron recovery system valve H;
step 2.2: opening a valve E, adjusting the flow rate of the boron recovery system water tank, and introducing the boric acid in the ion exchange bed into the boron recovery system water tank by using demineralized water;
the step 3 comprises the following steps:
step 3.1: opening a valve E, and filling the ion exchange bed to be full of water;
step 3.2: opening the valve A;
step 3.3: opening a valve I, draining water by adopting static pressure, and monitoring the drainage amount I;
step 3.4: closing the valve I, filling compressed air into the ion exchange bed to slight positive pressure, slightly opening the valve I, monitoring the water discharge amount II, and closing the valve I when the sum of the water discharge amount I and the water discharge amount II meets the requirement that the water is discharged to the upper part of the resin loading line within the range of 10-15 cm;
step 3.5: opening a valve F to loosen the plate-knot resin for 30 minutes, fully opening and fully closing the valve F for a plurality of times when the resin loosening is finished, and impacting the plate-knot resin;
step 3.6: repeating the step 3.1-3.5 twice, wherein the valve I is closed when the water discharge is increased to a range of 10-15cm below a resin loading line for the first time, and the valve I is closed when the water discharge is increased to a range of 30-35cm below the resin loading line for the second time;
the step 4 comprises the following steps:
step 4.1: opening a valve D;
step 4.2: and opening the valve E and the valve F to adjust the flow and pressure of the desalted water and the compressed air, and ensuring the loosened resin to be smoothly led out.
2. A method of high efficiency resin unloading for a high pressure ion exchange purification system as claimed in claim 1 wherein: the initial state before resin unloading is: all valves are in a closed state, the ion exchange bed is filled with boric acid, and the pressure is atmospheric pressure.
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| CN113277599A (en) * | 2021-07-01 | 2021-08-20 | 冯殿伟 | Agent unloading system of ion exchanger in process water treatment process and use method |
| CN115193490B (en) * | 2022-06-30 | 2023-08-15 | 江苏核电有限公司 | One-loop purification system of VVER unit and use method |
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| CN103177781B (en) * | 2011-12-23 | 2015-08-26 | 江苏核电有限公司 | A kind of pressurized-water reactor nuclear power plant unit primary Ioops sulfate concentration control method |
| CN103801411B (en) * | 2014-02-19 | 2015-11-18 | 内蒙古包钢钢联股份有限公司 | DW system demineralized water system mixed bed renovation process |
| CN104575647B (en) * | 2015-01-04 | 2017-01-18 | 上海核工程研究设计院 | Radioactive waste resin shielding transfer method and device |
| CN106391147A (en) * | 2016-03-23 | 2017-02-15 | 江苏核电有限公司 | Resin regeneration and post-flushing method of steam generator drainage sewage purification system in nuclear power station |
| CN107527666B (en) * | 2016-06-20 | 2019-07-12 | 江苏核电有限公司 | A kind of quantization control method of one loop of nuclear power station purification system boric acid saturation |
| CN106373628B (en) * | 2016-10-11 | 2018-05-29 | 中广核工程有限公司 | The processing system and method for radioactivity resin |
| CN107293343B (en) * | 2017-06-12 | 2019-04-12 | 航天晨光股份有限公司 | The loading and unloading transfer device and its conveyer method of nuclear power station spent resin |
| CN107170505A (en) * | 2017-06-29 | 2017-09-15 | 江苏金环环保设备有限公司 | The composite processing system and method for a kind of nuclear power plant's boron-containing radioactive waste liquid |
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