Economical nuclear power station nuclear island waste liquid treatment control method
阅读说明：本技术 一种更为经济的核电站核岛废液处理控制方法 (Economical nuclear power station nuclear island waste liquid treatment control method ) 是由 赖宏宇 蔡金平 吴忠良 郑梅芳 史慧梅 田民顺 陈勇 黄成� 刘祥亭 邓清泉 王 于 2020-04-07 设计创作，主要内容包括：提供一种能有效兼顾除盐及蒸发处理最佳经济性的核岛废液处理控制方法,在满足废物排放要求的条件下使经济效益最大化。包括以下步骤：S1：使用除盐处理费用估算：S2：使用蒸发处理费用估算：S3:除盐费用与蒸发费用对比的平衡点：S4:废液处理控制方法选择。(The method for treating and controlling the nuclear island waste liquid can effectively give consideration to the optimal economy of desalting and evaporation treatment, and can maximize the economic benefit under the condition of meeting the waste discharge requirement. The method comprises the following steps: s1: estimation of cost using a desalting treatment: s2: estimation of treatment cost using evaporation: s3 balance point for desalination cost versus evaporation cost: and S4, selecting a waste liquid treatment control method.)
1. A more economic nuclear power station nuclear island waste liquid treatment control method is characterized by comprising the following steps: the method comprises the following steps:
s1: estimation of cost using a desalting treatment:
setting the content of sodium ions in wastewater to be treated as X (mg/kg), the concentration of boron in wastewater to be treated as Y (mg/kg), and not considering the content of calcium ions; then a train of TEU001DE and TEU002DE together contain 1500+1500 × 0.3636 ═ 2015.4(L) cation resin, exchange 2015.4L × 1.90eq/L ═ 3886.26mol ═ 89384g sodium ions, and the volume of TEU process wastewater treated by a train of TEU001/002DE resin is reduced to(t)；
A column of TEU001DE and TEU002DE was purchased at a cost of 1500 x (80+150) to 345000 x resin; the cost of curing the row of TEU001DE and TEU002DE waste resin is 173280 yuan, and the cost of post-treating the row of TEU001DE and TEU002DE solid waste is 2400000 yuan;
therefore, a desalting treatment is used(t) the cost of nuclear island wastewater is 345000+173280+ 2400000-2918280 yuan;
s2: estimation of treatment cost using evaporation:
one pot of TEU001EV had a volume of 2.65m3Concentrating until the boron concentration is 40000mg/kg, and treating(t) the number of times the TEU process wastewater needs to be evaporated is:
the cost of curing one-pot TEU001EV is 80860 yuan, and the cost of post-treating one-pot TEU001EV solid waste is 1120000 yuan;
therefore, it uses evaporation to treat(t) cost of TEU process wastewater is estimated as:
s3 balance point for desalination cost versus evaporation cost:
by
(1) when the boron concentration is equal to 2.89 times of the sodium concentration, the desalting cost is equal to the evaporation cost;
(2) when the boron concentration is less than 2.89 times of the sodium concentration, the desalting cost is more than the evaporation cost;
(3) when the boron concentration is more than 2.89 times of the sodium concentration, the desalting cost is less than the evaporation cost;
similarly, if the calcium ion content in the wastewater to be treated is X' (mg/kg) and the boron concentration is Y (mg/kg), and the sodium ion content is not considered, the following can be calculated in the same manner: 3.33X ═ Y, i.e. when TEU is treating wastewater:
(1) when the boron concentration is equal to 3.33 times of the calcium concentration, the desalting cost is equal to the evaporation cost;
(2) when the boron concentration is less than 3.33 times of the calcium concentration, the desalting cost is more than the evaporation cost;
(3) when the boron concentration is more than 3.33 times of the calcium concentration, the desalting cost is less than the evaporation cost.
S4 selection of waste liquid treatment control method
The following method is adopted:
(1) when the total gamma specific activity is less than 1MBq/t, treating the nuclear island waste liquid of the nuclear power station by adopting a filtration method;
(2) when the specific activity of the total gamma is more than or equal to 1 MBq/t;
(2.1) when Na < + > is less than 10mg/kg and Ca2 < + > is less than 4mg/kg, treating the nuclear island waste liquid of the nuclear power plant by adopting a desalting method;
(2.2) when Na + is not less than 10mg/kg or Ca2+ is not less than 4mg/kg,
(2.2.1) if B is more than or equal to Na 2.89 and B is more than or equal to Ca 3.33, treating the nuclear island waste liquid of the nuclear power plant by a desalting method;
(2.2.2) if B is less than Na 2.89 or B is less than Ca 3.33, treating the nuclear island waste liquid of the nuclear power station by adopting an evaporation method.
2. The method for controlling the treatment of the nuclear island waste liquid in the nuclear power plant more economically according to claim 1, is characterized in that: in S4, B represents the boron concentration.
3. The method for controlling the treatment of the nuclear island waste liquid in the nuclear power plant more economically according to claim 1, is characterized in that: in the S1, the TEU001DE is a cation exchange resin bed.
4. The method for controlling the treatment of the nuclear island waste liquid in the nuclear power plant more economically according to claim 3, is characterized in that: the resin charged was a positive resin of Rohm and HaasiRN77 hydrogen form.
5. The method for controlling the treatment of the nuclear island waste liquid in the nuclear power plant more economically according to claim 4, is characterized in that: the loading capacity is 1500L.
6. The method for controlling the treatment of the nuclear island waste liquid in the nuclear power plant more economically according to claim 4, is characterized in that: the purchase price of the resin is 80 yuan/L.
7. The method for controlling the treatment of the nuclear island waste liquid in the nuclear power plant more economically according to claim 1, is characterized in that: in the S1, TEU002DE is a mixed ion exchange resin bed.
8. The method for controlling the treatment of the nuclear island waste liquid in the nuclear power plant more economically according to claim 7, is characterized in that: in the S1, the resin is Rohm and HaasiIRN 160 hydrogen type mixed resin.
9. The method for controlling the treatment of the nuclear island waste liquid in the nuclear power plant more economically according to claim 8, is characterized in that: in S1, the loading capacity is 1500L, and the purchase price is 150 Yuan/L.
10. The method for controlling the treatment of the nuclear island waste liquid in the nuclear power plant more economically according to claim 8, is characterized in that: in S1, TEU001DE accounts for 36.36%.
Technical Field
The technology relates to the technical field of nuclear power station chemistry, in particular to a more economical method for treating and controlling waste liquid of a nuclear island of a nuclear power station.
Background
The nuclear island waste liquid treatment system (hereinafter referred to as TEU) of the nuclear power station is used for receiving waste liquid from each system of the nuclear island, storing, monitoring and treating the waste liquid. The waste liquid is filtered, desalted or evaporated and monitored, and then is discharged to a nuclear island waste liquid discharge system (hereinafter referred to as TER), and concentrated liquid generated by evaporation is sent to a solid waste treatment system (hereinafter referred to as TES) for barreling and solidification.
According to the chemical impurity ion content and the radioactive moisture of the waste liquid, the treatment modes of filtering, desalting and evaporating are respectively adopted, and the common treatment modes of domestic M310 nuclear power units such as Fuqing nuclear power units No. 1-4 machines are as follows:
TABLE 1
For the waste liquid with the total gamma specific activity less than 1MBq/t, the radioactivity meets the discharge requirement, so the waste liquid can be discharged to a nuclear island waste liquid discharge System (SEL) through filtration treatment; for the waste liquid with the total gamma specific activity more than or equal to 1MBq/t, if the content of chemical impurity ions is low (Na)+< 10mg/kg and Ca2+Less than 4mg/kg), and desalting to obtain the product with high content of chemical impurity ions (Na)+Not less than 10mg/kg or Ca2+Not less than 4mg/kg) is treated by evaporation. Fuqing nuclear power 1-4 machine and other domestic M31A desalting loop of a nuclear island waste liquid treatment system of a 0 nuclear power unit generally adopts a mode of connecting a cation exchange resin bed and a mixed ion exchange resin bed in series, and the main purpose of limiting the contents of sodium and calcium at an inlet of the desalting bed is to protect the resin bed and prevent the desalting bed from premature failure due to high impurity ion content.
However, evaporation of the waste stream produces a concentrate that is sent to a solid waste disposal system (TES) for solidification in drums at a cost of about 2.65m per drum3The solidification cost of the concentrated solution of the evaporator (hereinafter abbreviated as TEU001EV) of the nuclear island waste liquid treatment system is about 8 ten thousand yuan, and the post-treatment cost is about 112 ten thousand yuan. Therefore, the method for treating and controlling the nuclear island waste liquid has great significance for exploring the optimal economy of desalting and evaporating treatment under the condition of meeting the waste discharge requirement.
Disclosure of Invention
The invention aims to: the method for treating and controlling the nuclear island waste liquid can effectively give consideration to the optimal economy of desalting and evaporation treatment, and can maximize the economic benefit under the condition of meeting the waste discharge requirement.
The technical scheme of the invention is as follows: a more economical nuclear power station nuclear island waste liquid treatment control method comprises the following steps:
s1: estimation of cost using a desalting treatment:
setting the content of sodium ions in wastewater to be treated as X (mg/kg), the concentration of boron in wastewater to be treated as Y (mg/kg), and not considering the content of calcium ions; then a train of TEU001DE and TEU002DE together contain 1500+1500 × 0.3636 ═ 2015.4(L) cation resin, exchange 2015.4L × 1.90eq/L ═ 3886.26mol ═ 89384g sodium ions, and the volume of TEU process wastewater treated by a train of TEU001/002DE resin is reduced to
The resin cost of purchasing a column of TEU001DE and TEU002DE was 1500 x (80+150) 345000 (yuan); the cost of curing the row of TEU001DE and TEU002DE waste resin is 173280 yuan, and the cost of post-treating the row of TEU001DE and TEU002DE solid waste is 2400000 yuan;
therefore, a desalting treatment is used
s2: estimation of treatment cost using evaporation:
one pot of TEU001EV had a volume of 2.65m3Concentrating until the boron concentration is 40000mg/kg, and treating(t) the number of times the TEU process wastewater needs to be evaporated is:
the cost of curing one-pot TEU001EV is 80860 yuan, and the cost of post-treating one-pot TEU001EV solid waste is 1120000 yuan;
therefore, it uses evaporation to treatThe cost of the TEU process wastewater was estimated as:
s3 balance point for desalination cost versus evaporation cost:
byThe following can be obtained: 2.89X ═ Y, i.e. when TEU is treating wastewater:
(1) when the boron concentration is equal to 2.89 times of the sodium concentration, the desalting cost is equal to the evaporation cost;
(2) when the boron concentration is less than 2.89 times of the sodium concentration, the desalting cost is more than the evaporation cost;
(3) when the boron concentration is more than 2.89 times of the sodium concentration, the desalting cost is less than the evaporation cost;
similarly, if the calcium ion content in the wastewater to be treated is X' (mg/kg) and the boron concentration is Y (mg/kg), and the sodium ion content is not considered, the following can be calculated in the same manner: 3.33X ═ Y, i.e. when TEU is treating wastewater:
(1) when the boron concentration is equal to 3.33 times of the calcium concentration, the desalting cost is equal to the evaporation cost;
(2) when the boron concentration is less than 3.33 times of the calcium concentration, the desalting cost is more than the evaporation cost;
(3) when the boron concentration is more than 3.33 times of the calcium concentration, the desalting cost is less than the evaporation cost.
S4 selection of waste liquid treatment control method
The following method is adopted:
(1) when the total gamma specific activity is less than 1MBq/t, treating the nuclear island waste liquid of the nuclear power station by adopting a filtration method;
(2) when the specific activity of the total gamma is more than or equal to 1 MBq/t;
(2.1) when Na < + > is less than 10mg/kg and Ca2 < + > is less than 4mg/kg, treating the nuclear island waste liquid of the nuclear power plant by adopting a desalting method;
(2.2) when Na + is not less than 10mg/kg or Ca2+ is not less than 4mg/kg,
(2.2.1) if B is more than or equal to Na 2.89 and B is more than or equal to Ca 3.33, treating the nuclear island waste liquid of the nuclear power plant by a desalting method;
(2.2.2) if B is less than Na 2.89 or B is less than Ca 3.33, treating the nuclear island waste liquid of the nuclear power station by adopting an evaporation method;
in S4, B represents the boron concentration.
In the S1, the TEU001DE is a cation exchange resin bed.
The resin contained is a positive resin of Rohm and HaasiRN77 hydrogen type,
the loading capacity is 1500L.
The purchase price of the resin is 80 yuan/L.
In the S1, TEU002DE is a mixed ion exchange resin bed.
In the S1, the resin is Rohm and HaasiIRN 160 hydrogen type mixed resin.
In S1, the loading is 1500L, and the purchase price is 150 Yuan/L
In S1, TEU001DE accounts for 36.36%.
The invention has the following remarkable effects: the method can effectively give consideration to the optimal economy of desalting and evaporation treatment of the nuclear island waste liquid treatment system, and can maximize the economic benefit under the condition of meeting the waste discharge requirement.
Drawings
FIG. 1 is a schematic diagram of the economy (sodium ion) of the current TEU waste liquid treatment mode of Fuqing nuclear power;
FIG. 2 is a schematic diagram showing the economy (calcium ion) of the current TEU waste liquid treatment mode of Fuqing nuclear power;
FIG. 3 is a schematic diagram showing the economy (sodium ion) of the TEU waste liquid treatment method of the present control method
FIG. 4 is a schematic diagram showing the economy (calcium ion) of the TEU waste liquid treatment method of the present control method
Detailed Description
The purification capacity, the evaporation and the desalination treatment economy of the desalination bed of the nuclear island waste liquid treatment system are calculated, compared and demonstrated, so that a more economical control method is provided.
Resin contained in a cation exchange resin bed (hereinafter, referred to as TEU001DE) of a nuclear island waste liquid treatment system of Fuqing nuclear power unit No. 1-4 is Rohm and HaasIRN77 hydrogen type cation resin, the loading amount is 1500L, the purchase price of the resin is 80 yuan/L, and the exchange capacity of the cation resin is 1.90 eq/L; the mixed ion exchange resin bed (hereinafter referred to as TEU002DE) contains Rohm and HaasIRN160 hydrogen type mixed resin with loading amount of 1500L and purchase price of 150 yuan/L, wherein the cation resin accounts for 36.36% and the cation resin exchange capacity is 1.90 eq/L. The content of sodium ions in the wastewater to be treated is set as X (mg/kg), the concentration of boron is set as Y (mg/kg), the content of calcium ions is not considered, and the calculation is simplified
A more economical nuclear power station nuclear island waste liquid treatment control method comprises the following steps:
s1: estimation of cost using a desalting treatment:
the TEU001DE and TEU002DE in one row contain 1500+1500 × 0.3636 ═ 2015.4(L) cation resin, which can exchange 2015.4L × 1.90eq/L ═ 3886.26mol ═ 89384g sodium ion, and the volume of TEU process waste water which can be treated in one row of TEU001/002DE resin is equal to that
The resin cost of purchasing a column of TEU001DE and TEU002DE was 1500 x (80+150) 345000 (yuan); according to engineering practice, the cost of curing a train of TEU001DE and TEU002DE waste resins is 173280 yuan, and the cost of post-treating a train of TEU001DE and TEU002DE solid wastes is 2400000 yuan;
therefore, a desalting treatment is usedThe cost of the nuclear island wastewater is about 345000+173280+ 2400000-2918280 yuan.
S2: estimation of treatment cost using evaporation:
one pot of TEU001EV had a volume of 2.65m3Concentrating until the boron concentration is 40000mg/kg, and treating(t) the number of times the TEU process wastewater needs to be evaporated is:
TEU001EV uses steam heating of a conventional island auxiliary steam distribution system (hereinafter referred to as SVA) for evaporation, and steam of SVA mainly comes from dead steam of a unit main steam system (hereinafter referred to as VVP), so that the cost for heating TEU001EV is neglected; according to engineering practice, the cost of curing one-pot TEU001EV is 80860 dollars, and the cost of post-treating one-pot TEU001EV solid waste is 1120000 dollars.
Therefore, it uses evaporation to treatThe cost of the TEU process wastewater was estimated as:
s3 balance point for desalination cost versus evaporation cost:
byThe following can be obtained: 2.89X ═ Y, i.e. when TEU is treating wastewater:
(1) when the boron concentration is equal to 2.89 times of the sodium concentration, the desalting cost is equal to the evaporation cost;
(2) when the boron concentration is less than 2.89 times of the sodium concentration, the desalting cost is more than the evaporation cost;
(3) when the boron concentration is more than 2.89 times of the sodium concentration, the desalting cost is less than the evaporation cost.
In the same way, the calcium ion content in the wastewater to be treated is X' (mg/kg), the boron concentration is Y (mg/kg), the sodium ion content is not considered, the calculation is simplified, and the following can be calculated in the same way: 3.33X ═ Y, i.e. when TEU is treating wastewater:
(1) when the boron concentration is equal to 3.33 times of the calcium concentration, the desalting cost is equal to the evaporation cost;
(2) when the boron concentration is less than 3.33 times of the calcium concentration, the desalting cost is more than the evaporation cost;
(3) when the boron concentration is more than 3.33 times of the calcium concentration, the desalting cost is less than the evaporation cost.
S4 New method selection
The treatment method of the current nuclear island waste liquid of the domestic M310 nuclear power unit comprises the following steps: sodium is less than 10mg/kg and calcium is less than 4mg/kg for desalination, sodium is greater than 10mg/kg or calcium is greater than 4mg/kg for evaporation, the economics are shown in FIGS. 3 and 4, which can be summarized as the following table
TABLE 2
Therefore, the following method is adopted:
(1) when the total gamma specific activity is less than 1MBq/t, the nuclear island waste liquid of the nuclear power station is treated by adopting a filtration method
(2) When the specific activity of the total gamma is more than or equal to 1MBq/t,
(2.1) when Na+< 10mg/kg and Ca2+Less than 4mg/kg, and treating the nuclear island waste liquid of the nuclear power station by a desalting method;
(2.2) when Na+Not less than 10mg/kg or Ca2+When the content is more than or equal to 4mg/kg,
(2.2.1) if B is more than or equal to Na 2.89 and B is more than or equal to Ca 3.33, treating the nuclear island waste liquid of the nuclear power plant by a desalting method;
(2.2.2) if B is less than Na 2.89 or B is less than Ca 3.33, treating the nuclear island waste liquid of the nuclear power station by adopting an evaporation method;
wherein B represents the boron concentration.