CN111960566A - Condensed water fine treatment system and method suitable for floating reactor - Google Patents
Condensed water fine treatment system and method suitable for floating reactor Download PDFInfo
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- CN111960566A CN111960566A CN202010659419.3A CN202010659419A CN111960566A CN 111960566 A CN111960566 A CN 111960566A CN 202010659419 A CN202010659419 A CN 202010659419A CN 111960566 A CN111960566 A CN 111960566A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/425—Treatment of water, waste water, or sewage by ion-exchange using cation exchangers
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
- C02F2103/023—Water in cooling circuits
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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Abstract
The invention relates to a condensed water fine treatment system and a method for a floating reactor, wherein the system comprises: the system comprises a condensate filter, a first condensate demineralizer, a second condensate demineralizer, a first resin catcher and a second resin catcher; the entry of congealing the water filter is connected with the pipeline upper reaches of water supply system congeals, the export respectively with the entry linkage of first congealing water demineralizer and second congealing water demineralizer, the export of first congealing water demineralizer and second congealing water demineralizer respectively with the entry linkage of first resin trapper and second resin trapper, the export of first resin trapper and second resin trapper respectively with congeal water supply system's pipeline low reaches and be connected. The system disclosed by the invention is simple in structure and convenient to use, realizes the function of purifying condensed water under multiple working conditions, ensures the quality of water supply, and can ensure the function maximization while minimizing the system configuration.
Description
Technical Field
The invention relates to condensed water treatment, in particular to a condensed water fine treatment system and a condensed water fine treatment method suitable for a floating reactor, belongs to the field of offshore floating nuclear reactor application, and particularly relates to the field of secondary side water quality control of a steam generator.
Background
The floating reactor takes seawater as a condenser hot trap, and a set of condensed water fine treatment system for desalting is required to be arranged according to the requirements of national standards, energy departments, electric power and other industry standards. The system is generally connected to a condensed water supply system in a bypass mode, and the system achieves the purpose of purifying condensed water by removing ionic and suspended impurities in the condensed water. In the unit starting stage, the input of the system can enable the condensed water to quickly reach the requirement of a recovery standard, so that the discharge amount of the condensed water is reduced, and the starting time of the unit is shortened; during normal operation of the unit, condensed water caused by leakage of the main condenser and other reasons can be purified to ensure the quality of water supply when the quality of the condensed water exceeds the standard, and when the unit needs to be shut down for a large leakage accident, the condensed water for pollution treatment provides relief time for emergency shutdown.
The secondary side water quality adjusting scheme of the steam generator directly influences the configuration of the condensate polishing demineralizer and the combination mode of anion and cation resin in the condensate polishing demineralizer. The secondary side parameters (the pressure is 3.7Mpa and the temperature is 245 ℃) of the floating reactor steam generator are much lower than those of the nuclear power station, the space of the floating reactor steam generator is relatively closed, and ammonia, hydrazine and the like which are used as hazardous chemical substances with full volatility have higher requirements on cabin isolation, so that the nuclear power station is not beneficial to occupational safety; in addition, the storage, transportation and use of hazardous chemicals are limited on the floating reactor.
The condensate polishing system of the power station treats a large amount of condensate, is divided into four modules of condensate polishing, resin regeneration, waste water discharge and chemical storage, and is provided with dozens of related devices. The fine treatment device is provided with a plurality of positive beds and mixed beds, a full-flow operation mode of 'multi-use one standby' is adopted, the operation steps of the system are various, more devices and valves are involved, the fine treatment device is connected with a unit condensation water supply system, the operation safety and stability of the unit are directly influenced, the system and a control program are large and complex, and the initial investment and the operation cost are high. The control system which feeds back the control system by taking fixed time as a step sequence according to the experience of a power station is not very good in investment generally, and especially the fixed time and flow control are not suitable for the hydraulic layering process, the forward washing process after regeneration and the backwashing mixing process of mixed bed resin, the flow rate is continuously adjusted according to the actual separation and mixing conditions, even repeatedly, otherwise, the problems of poor resin separation and mixing effect and the like are easily caused. In addition, the fault diagnosis and early warning mechanism in the program control system cannot cope with the complex and changeable emergency situation of the system, the automatic control and processing cannot be really realized, and the application of the program control system in a fine processing system is also limited.
The floating reactor has the characteristics of compact structure, flexible application, low nuclear safety risk, short construction period and the like, and one of the design ideas is to simplify the configuration on the basis of referring to onshore mature nuclear power so as to improve the economy. Due to the influence of factors such as self characteristics, space limitation and the like, the floating reactor can only collect and manage waste resin without considering the regeneration of the resin on the ship, but the necessity of simplifying the operation mode of the condensate fine treatment system is more remarkable.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a condensed water fine treatment system and a condensed water fine treatment method for a floating reactor.
The technical scheme adopted for realizing the aim of the invention is a condensate fine treatment system for a floating reactor, which comprises: the system comprises a condensate filter, a first condensate demineralizer, a second condensate demineralizer, a first resin catcher and a second resin catcher; the entry of congealing the water filter is connected with the pipeline upper reaches of water supply system congeals, the export respectively with the entry linkage of first congealing water demineralizer and second congealing water demineralizer, the export of first congealing water demineralizer and second congealing water demineralizer respectively with the entry linkage of first resin trapper and second resin trapper, the export of first resin trapper and second resin trapper respectively with congeal water supply system's pipeline low reaches and be connected.
Further, a water fine treatment system congeals for floating heap still includes first net condensate pump and second net condensate pump, first net condensate pump and second net condensate pump are connected respectively between first resin trapper and second resin trapper and the pipeline low reaches of condensing water supply system, and the entry of first net condensate pump and second net condensate pump passes through the bridge pipe and connects.
In the technical scheme, an inlet isolating valve is arranged between the inlet of the condensate filter and the upstream of the pipeline of the condensate water supply system, and outlet isolating valves are arranged between the first and second pure condensate pumps and the downstream of the pipeline of the condensate water supply system.
Further, the condensed water fine treatment system for the floating reactor further comprises a waste resin receiving tank and a resin adding hopper, wherein the resin adding hopper, the waste resin receiving tank and the condensed water desalter are fixedly connected or detachably connected.
In the technical scheme, the condensed water filter is a duplex filter and consists of two vertical single-cylinder filters connected in parallel.
In the technical scheme, the condensed water desalter is internally provided with a water condensate desalter, wherein the volume ratio of the water condensate desalter to the water condensate is 1: 2, a male resin and a female resin.
Furthermore, the present invention provides a method for refining condensed water by the above system, which comprises:
when the condensate fine treatment system runs, an inlet and outlet electric isolation valve is firstly opened, then a clean condensate pump is started, and a condensate filter and a condensate demineralizer are used; when the load of the unit is more than 50% of power, or after the system is put into operation during normal operation and the water quality of the supplied water is judged to be not up to the standard, another pure condensate pump is started, another desalter is put into operation to purify the condensate at the full flow, and the system is restored to the standby state when the water quality of the condensate at the outlet of the main condensate pump reaches the standard;
the condensate to be purified firstly passes through a condensate filter to remove corrosion products and suspended solids, then passes through a condensate demineralizer to remove dissolved salt impurities, then passes through a resin catcher to intercept broken resin leaking into the condensate, and the purified condensate is boosted by a condensate purifying pump and then sent back to a main condensate pipeline.
Furthermore, after one condensate demineralizer fails to work, the condensate demineralizer is switched to another condensate demineralizer in the running process of the condensate fine treatment system, and the failed condensate demineralizer rapidly enters resin replacement operation to reach a standby state.
Furthermore, after the resin in the condensate demineralizer is invalid, a water source is provided by a water making system and discharged to a waste resin receiving tank, then the waste resin receiving tank is transferred to a standard container and then is transferred to a resin storage room, and the waste resin is periodically transferred to a transport bank for treatment.
Further, the filling of new resin in the condensate demineralizer is provided with a water source by a water making system, the mixed resin adopts a resin adding hopper to form a negative pressure chamber through the action of high-speed water flow of an internal ejector so as to enter the condensate demineralizer, and water used in the resin loading process is discharged to the water making system for recycling.
Compared with the prior art, the invention has the following characteristics:
1. the condensate fine treatment system for the floating reactor does not consider regeneration on a resin ship and equipment redundancy, has simpler operation, compact structure and strong operability, can be put into operation only when the water quality is abnormal, can meet the requirement of purifying condensate under different working conditions, at least ensures the capacity of half-flow purification, and can adjust the purification flow according to the water quality condition when necessary. The system has the advantages of small waste resin discharge amount, no consumption of chemicals, no increase of waste water discharge, small initial investment and operation cost of equipment and high economical efficiency.
2. The invention preferentially adopts a half-flow operation mode, preferentially starts one clean condensate pump and a corresponding condensate demineralizer, because the design capacities of two mixing beds are completely the same, the operation end points of two rows of condensate demineralizers which are started successively are pulled open, and after the standby condensate demineralizer is started, the invalid demineralizer can be withdrawn from operation and then resin replacement operation is carried out, so that the demineralizers can reach a standby state as soon as possible.
3. The resin loading and unloading operation of the invention adopts a semi-automatic mode, and the resin loading and unloading operation is completed by combining manual judgment with self-starting equipment, valve accessories and other modes, the equipment configuration is simple, the efficiency is higher, and the system control program is simple and has strong flexibility.
4. The waste water discharged by filling the resin can be recycled by the water making system, the produced water of the newly loaded resin can be circularly purified, and meanwhile, the water making system can also receive unqualified water which is periodically tested and operated by the condensate fine treatment system and then is purified and reused.
The invention is particularly suitable for the field of secondary side water quality control of the steam generator, and can ensure the quality of feed water by purifying a condensate water fine treatment system, thereby achieving the purposes of maintaining the safe operation of the steam generator and prolonging the service life of the steam generator.
Drawings
Fig. 1 is a schematic structural view of a condensate polishing system for a floating pile according to the present invention.
Reference numbers in the figures: 1.1-condensate filter, 1.2-first condensate demineralizer, 1.3-second condensate demineralizer, 1.4-first resin catcher, 1.5-second resin catcher, 1.6-first condensate pump, 1.7-second condensate pump, 1.8-inlet isolating valve, 1.9-outlet isolating valve, 2.1-resin adding hopper and 2.2-waste resin receiving tank.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
As shown in fig. 1, the condensate polishing system for a floating pile of the present invention comprises: condensate filter 1.1, first condensate demineralizer 1.2, second condensate demineralizer 1.3, first resin trapper 1.4, second resin trapper 1.5, first clear condensate pump 1.6 and second clear condensate pump 1.7, the relation of connection of above-mentioned each part is as follows:
the inlet of the condensate filter 1.1 is connected with the upstream of a pipeline (a mother pipe) of a condensate water supply system, the outlet of the condensate filter is respectively connected with the inlets of a first condensate demineralizer 1.2 and a second condensate demineralizer 1.3, the outlets of the first condensate demineralizer 1.2 and the second condensate demineralizer 1.3 are respectively connected with the inlets of a first resin catcher 1.4 and a second resin catcher 1.5, and the outlets of the first resin catcher 1.4 and the second resin catcher 1.5 are respectively connected with the downstream of the pipeline (the mother pipe) of the condensate water supply system.
In order to compensate the pressure loss of the condensed water after passing through the condensed water filter 1.1 and the condensed water desalinization devices (1.2, 1.3) and return the condensed water to the condensed water supply system, a first purified water pump 1.6 and a second purified water pump 1.7 are respectively connected between the first resin catcher 1.4 and the second resin catcher 1.5 and the downstream of the condensed water supply system. The inlets of the first water purifying and condensing pump 1.6 and the second water purifying and condensing pump 1.7 are connected through a bridge pipe, and when the water purifying and condensing pump of the operation single-row fine processing device fails, the operation can be switched to another pump.
An inlet isolating valve 1.8 is arranged between an inlet of the condensate filter 1.1 and the upstream of a pipeline of the condensate water supply system, outlets of the first and second condensate water pumps 1.6 and 1.7 are connected in series and converged and then connected with the downstream of the pipeline of the condensate water supply system, and an outlet isolating valve 1.9 is arranged at a position close to the pipeline of the condensate water supply system.
The structure and the function of each part in the condensed water fine treatment system for the floating reactor are as follows:
the water condensing filter 1.1 is a duplex filter and consists of two vertical single-cylinder filters connected in parallel, the circulation capacity of the single-cylinder filters is full-flow water condensing, when one of the single-cylinder filters fails, the single-cylinder filters can be switched to the other single-cylinder filter, the standby single-cylinder filters are guaranteed by replacing filter elements of a failure sequence, and the two single-cylinder filters can be switched to each other to operate so as to improve the reliability of equipment. The duplex filter is arranged at the upstream of the bypass main pipe.
The condensate demineralizer (1.2, 1.3) is internally provided with a condensate demineralizer, wherein the volume ratio of the condensate demineralizer to the condensate demineralizer is 1: 2, the cation resin and the anion resin can ensure 50 percent of condensed water treatment capacity (rated working condition), and ionic impurities in the condensed water are removed in an ion exchange mode. For a floating reactor, the quality of the secondary loop water can be adjusted by adopting 'deoxidization before sodium sulfite water supply and phosphate adjustment furnace water pH', the defect that the sodium sulfite in a nuclear power station is possibly decomposed at high temperature is avoided, and therefore, a condensate demineralizer of the condensate fine treatment system directly adopts a combined mixed bed of hydrogen type cation resin and oxyhydrogen type anion resin.
The main function of the resin catcher (1.4, 1.5) is to catch broken resin which may leak in after the condensate demineralizers (1.2, 1.3) and to be arranged as an accessory after each condensate demineralizer.
The quantity of the clean condensate water pumps is two, each clean condensate water pump can guarantee 50% of flow condensate water (rated working condition), the clean condensate water pumps are respectively connected in series at the downstream of each condensate demineralizer, and the condensate water is returned to a condensate water supply system through pressure loss of the condensate water after passing through the condensate filter and the condensate demineralizer. Two net condensing water pump export converge the female pipe of assembly precision processing system, establish ties in the female pipe of filter export, and two net condensing water pump entrys pass through the bridge pipe and connect, when the net condensing water pump of the single fine processing apparatus of operation became invalid, changeable to another pump.
The resin adding hopper 2.1 is internally provided with an ejector, and a negative pressure chamber is formed under the action of high-speed water flow of the ejector, so that new resin above the negative pressure chamber is sucked into the ejector and mixed with the sprayed water flow to enter the condensate demineralizer, and the function of filling the new resin is realized. The waste resin receiving tank 2.2 can be designed into a funnel-shaped storage tank with a cover for receiving waste resin in the condensate demineralizer, and the loading volume of the waste resin receiving tank is larger than the resin loading volume in a single condensate demineralizer.
Resin adds fill 2.1 and useless resin receiving tank 2.2 can be connected with the demineralizer of congealing water through cutting ferrule or other connecting pieces, can direct fixed connection and keep apart through the valve, also can be for the dismantlement formula to connect, when needs use the installation can, can dismantle when need not the use and place.
The condensate fine treatment system is put into use when the quality of condensate water at the outlet of the main condensate pump is abnormal in the starting process of the unit and during the normal operation period, and the condensate water is purified by adopting half flow preferentially when the system is put into use.
The process for realizing the condensate polishing of the condensate polishing system for the floating reactor comprises the following steps:
1) and (3) condensate refining treatment:
the condensate fine treatment system is connected into the condensate water supply system in a bypass mode, the system is not put into use when the two-loop water quality index is normal, the condensate fine treatment system is put into use when the condensate water quality of the outlet of the main condensate water pump is abnormal in the starting process of the unit and during the normal operation, and the system preferentially adopts half-flow purification condensate water when put into use. At this time, after an inlet isolating valve 1.8 and an outlet isolating valve 1.9 of an inlet and an outlet of the system are opened, a net condensate pump 1.6 (or 1.7) is started, and a condensate filter 1.1 and a condensate demineralizer 1.2 (or 1.3) are put into use. When the load of the unit is more than 50% of power or after the system is put into operation at half flow rate for purifying the condensed water during normal operation, if the water quality of the supplied water is judged to not reach the standard, the other water purifying and condensing pump 1.7 (or 1.6) is started, and the other desalter 1.3 (or 1.2) is put into operation for purifying the condensed water at full flow rate. And when the quality of the condensed water at the outlet of the main condensed water pump reaches the standard, the system is restored to the standby state.
The condensate to be purified firstly passes through a condensate filter 1.1 to remove corrosion products and suspended solids, and then passes through a condensate demineralizer 1.2 (or 1.3) to remove dissolved salt impurities. In order to prevent broken resin from leaking into condensate, a resin catcher is arranged behind the mixing bed, and purified condensate is sent back to the main condensate pipeline after being boosted by a condensate purifying pump.
2) Unloading waste resin:
when the resin is unloaded, the exhaust valve of the condensate demineralizer 1.2 (or 1.3) is opened to introduce compressed air to loosen the resin, then the exhaust valve is closed, a water making lightering pump of a water making system is used for taking water from the demineralized water tank, water is fed from the bottom of the condensate demineralizer 1.2 (or 1.3) to drive the invalid resin to be discharged to the waste resin receiving tank 2.2, and the pump and all valves at the bottom are closed until no resin exists in a resin discharge port. At the moment, residual resin exists at the bottom of the desalter, compressed air is introduced into the bottom of the desalter to stir stored water in the tank, the resin discharge valve is closed and air inlet is stopped after the water level in the tank is completely emptied, then the exhaust valve at the top of the desalter is opened to release the pressure, the water inlet valve at the bottom of the desalter is opened and the water making lightering pump is started, the exhaust valve is closed after water is discharged, the pump is continuously operated to convey water, the valve of the resin discharge pipe is opened, the steps are repeated to convey the residual resin to the waste resin receiving tank, finally, the resin is discharged to a transfer bag through a hopper at the bottom of the tank and stored in a resin storage room, the waste resin is periodically transferred to the shore through a transfer ship, and waste water generated during resin unloading is.
3) Filling of new resin:
after the waste resin in the condensate demineralizer is unloaded, a resin addition hopper (including an ejector) 2.1 is adopted for carrying out new resin filling operation. Make water lightering pump and follow demineralized water tank water intaking and fill 2.1 through the resin, the high-speed rivers effect through inside sprayer forms the negative pressure cavity in adding the fill, and the mixed resin that loads in the fill because negative pressure effect and demineralized water mix and get into the condensate demineralizer, loads resin process water and discharges back to and make water storage tank recycle. And (3) after the mixed resin enters a condensate demineralizer, adding demineralized water until the water level is higher than the resin layer, and introducing compressed air to fluidize and fully mix the resin.
Claims (10)
1. A condensate polishing system for a floating reactor, comprising: the system comprises a condensate filter, a first condensate demineralizer, a second condensate demineralizer, a first resin catcher and a second resin catcher; the entry of congealing the water filter is connected with the pipeline upper reaches of water supply system congeals, the export respectively with the entry linkage of first congealing water demineralizer and second congealing water demineralizer, the export of first congealing water demineralizer and second congealing water demineralizer respectively with the entry linkage of first resin trapper and second resin trapper, the export of first resin trapper and second resin trapper respectively with congeal water supply system's pipeline low reaches and be connected.
2. A condensate polishing system for a floating stack according to claim 1, wherein: still include first clear condensate pump and second clear condensate pump, first clear condensate pump and second clear condensate pump are connected respectively between first resin trapper and second resin trapper and the pipeline low reaches of condensing water supply system, and the entry of first clear condensate pump and second clear condensate pump passes through the bridge pipe and connects.
3. A condensate polishing system for a floating stack according to claim 2, wherein: an inlet isolating valve is arranged between the inlet of the condensate filter and the upstream of the pipeline of the condensate water supply system, and an outlet isolating valve is arranged between the first and second water purifying and condensing pumps and the downstream of the pipeline of the condensate water supply system.
4. A condensate polishing system for a floating stack according to claim 3, wherein: still include useless resin receiving tank and resin and add the fill, resin adds between fill and the useless resin receiving tank and the condensate demineralizer fixed connection or detachable connection.
5. A condensate polishing system for a floating stack according to any one of claims 1 to 4, wherein: the condensed water filter is a duplex filter and consists of two vertical single-cylinder filters connected in parallel.
6. A condensate polishing system for a floating stack according to any one of claims 1 to 4, wherein: the condensed water demineralizer is internally provided with a water condensate demineralizer, wherein the volume ratio of the water condensate demineralizer to the water condensate demineralizer is 1: 2, a male resin and a female resin.
7. A method for refining condensed water by the system of claim 1, wherein:
when the condensate fine treatment system runs, an inlet and outlet electric isolation valve is firstly opened, then a clean condensate pump is started, and a condensate filter and a condensate demineralizer are used; when the load of the unit is more than 50% of power, or after the system is put into operation during normal operation and the water quality of the supplied water is judged to be not up to the standard, another pure condensate pump is started, another desalter is put into operation to purify the condensate at the full flow, and the system is restored to the standby state when the water quality of the condensate at the outlet of the main condensate pump reaches the standard;
the condensate to be purified firstly passes through a condensate filter to remove corrosion products and suspended solids, then passes through a condensate demineralizer to remove dissolved salt impurities, then passes through a resin catcher to intercept broken resin leaking into the condensate, and the purified condensate is boosted by a condensate purifying pump and then sent back to a main condensate pipeline.
8. The method for realizing condensate polishing as claimed in claim 6, wherein:
after one condensate demineralizer resin became invalid in the condensate fine treatment system operation process, switch to another condensate demineralizer, the condensate demineralizer that became invalid gets into resin rapidly and changes the operation in order to reach standby state.
9. The method for realizing condensate polishing as claimed in claim 7, wherein:
after the resin in the condensate demineralizer is invalid, a water source is provided by a water making system and is discharged to a waste resin receiving tank, then the waste resin receiving tank is transferred to a standard container and then is transferred to a resin storage room, and the waste resin is transferred to a transport bank for treatment at regular intervals.
10. The method for realizing condensate polishing as claimed in claim 8, wherein:
new resin fills in the demineralizer of congealing and is provided the water source by making the water system, and mixed resin adopts the resin to add the high-speed rivers effect that fill through inside sprayer and form the negative pressure cavity and get into the demineralizer of congealing, and the loading resin process water is arranged to making water system recycle.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115215459A (en) * | 2022-07-31 | 2022-10-21 | 中国船舶重工集团公司第七一九研究所 | Condensate water purification system and ship |
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