CN111943318A - Special resin for generator inner cooling water and preparation method thereof - Google Patents
Special resin for generator inner cooling water and preparation method thereof Download PDFInfo
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- CN111943318A CN111943318A CN202010883535.3A CN202010883535A CN111943318A CN 111943318 A CN111943318 A CN 111943318A CN 202010883535 A CN202010883535 A CN 202010883535A CN 111943318 A CN111943318 A CN 111943318A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J49/00—Regeneration or reactivation of ion-exchangers; Apparatus therefor
- B01J49/60—Cleaning or rinsing ion-exchange beds
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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
- C02F2001/427—Treatment of water, waste water, or sewage by ion-exchange using mixed beds
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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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- Treatment Of Water By Ion Exchange (AREA)
Abstract
The invention relates to a special resin for cold water in a generator and a preparation method thereof. The resin is mixed according to a proportion and filled in an ion exchange column of a cold water system in the generator, the cold water in the generator is purified, and meanwhile, the characteristic of special resin is utilized to carry out ion exchange alkalization treatment, so that the pH value of the cold water in the generator is improved. The conductivity of a cold water system in the generator is controlled stably, the pH value is moderate, the copper ion content is the lowest, the insulativity of the generator set and the phase modulation unit is improved to the maximum extent, and the running period is long. The method has the advantages of simple process, convenient operation and low maintenance cost.
Description
The technical field is as follows:
the invention relates to a special resin for generator inner cooling water and a preparation method thereof.
Background art:
the water-cooled generator has the characteristics of large single-machine capacity, small volume, light weight and the like, so the water-cooled generator is widely applied to large-scale generator sets. In order to prevent accidents caused by poor quality of internal cooling water, a great deal of research is carried out on the internal cooling water quality and the corrosion mechanism and the corrosion prevention method of copper at home and abroad, and the conclusion is obtained: a. the lower the conductivity of the inner cooling water is, the better the electrical insulating property is, and the insulation faults such as electrical flashover and the like can not occur; b. the root cause of copper corrosion is the existence of dissolved oxygen and dissolved carbon dioxide in the cold water, and in addition, the divalent copper ions generated in the corrosion process have acceleration effect on corrosion; c. corrosion products enter internal cooling water and are blocked by a generator magnetic field in the stator bar to be deposited, so that the hollow lead can be gradually blocked by copper corrosion products or the flow area is reduced, and the temperature rise and even burning loss of a generator coil are caused.
The hollow conductor of the water-cooled generator is generally made of industrial pure copper. The corrosion rate of pure copper in oxygen-free water is very low, only 10-4g/(m2H) of the order of magnitude. The water is slightly acidic due to the carbon dioxide and dissolved oxygen contained in the cold water of the phase modifier, and the corrosion rate of copper is greatly increased in the presence of oxygen. This is because the free carbon dioxide in the water damages the protective film on the copper surface, and the amount of copper elution gradually increases as the unit operation time becomes longer. When the copper content of the internal cooling water system rises faster and higher, the internal cooling water system in the stator bar is proved to have serious electrochemical corrosion. The corroded copper pipe surface is exposed out of the color of the matrix copper alloy, but has no metallic luster, the surface is basically flat or slightly uneven, the pipe wall is bright and fresh and is thinned, and the shape of uniform corrosion is formed.
In addition, an important characteristic of electrochemical corrosion is that copper corrosion products are accumulated at a low potential, only a small amount of the corrosion products are attached to the surface of the pipe wall of a corrosion part, and most of the corrosion products fall off from the pipe wall and enter a cooling medium. The hollow lead wire is gradually blocked by copper oxide or the flow area is reduced due to the deposition in the stator bar by the magnetic field of the generator, so that the temperature of the stator coil is increased, particularly, some copper scale is stripped off during the starting and stopping of the unit and can block the flow part of the bar, and the blocked coil or the iron core is increased in temperature and even burnt. Its harm has two points: generally, the corrosion rate of copper increases rapidly with increasing temperature. Thus, the coil temperature increases, which can lead to accelerated corrosion of the copper. If the control is not performed as early as possible, the generator bar is damaged due to local overheating, and the serious condition is that insulation breakdown causes grounding accidents. Therefore, controlling the corrosion of copper and preventing the deposition of copper corrosion products is an important measure to ensure safe operation of the generator.
The invention content is as follows:
the invention aims to provide a special resin for generator inner cooling water and a preparation method thereof, which are used for solving the problems of unqualified quality of the generator inner cooling water and corrosion of hollow copper wires at present, ensuring that a generator inner cooling water system is positioned in a passivation area to inhibit copper corrosion of the generator inner cooling water system, and ensuring safe and stable operation of a unit. The technical scheme of the invention is as follows:
the special resin for the cold water in the generator comprises the following components in percentage by mass:
hydrogen type resin: 32 percent of
Hydroxyl type resin: 60 percent of
Alkalizing resin: 8 percent of
The special resin for the cold water in the generator is prepared by the following steps:
1. and (3) saline solution treatment:
filling ion exchange resin into an ion regeneration column, filling 1/3-1/2 parts with the height of the whole height of the ion regeneration column, washing the resin layer at high speed by adopting a bottom water inlet mode, controlling the flow rate of a washing section at 10-60 m/h, loosening the resin layer, clearing mechanical impurities and finely-crushed resin powder in the resin, enabling the resin layer to be uniformly distributed without bubble inclusion and improving the regeneration effect, wherein the washing time is 40 minutes, adding a sodium chloride solution with the mass percentage concentration of 10% which is 2 times of the volume of the resin from the top of the ion exchange column for soaking, the soaking time is 1-2 hours, and feeding desalted water from the top of the ion regeneration column for washing until the discharged water is clear and not turbid;
2. pretreatment:
2.1 treating the cation exchange resin with salt solution, continuously adding sodium hydroxide solution with the mass percentage concentration of 2-4% from the top of the ion regeneration column, soaking the resin for 4-8 hours, then carrying out downstream flushing on the resin layer, and carrying out standby after the discharge conductivity of flushing is less than 500 mu s/cm;
2.2 treating the anion exchange resin with saline solution, continuously adding a hydrochloric acid solution with the mass percentage concentration of 5% from the top of the ion regeneration column, soaking the resin for 4-8 hours, then carrying out downstream washing on the resin layer, and carrying out standby after the discharge conductivity of washing is less than 500 mu s/cm;
3. resin regeneration:
3.1 regeneration of hydrogen resin: after the cation exchange resin is treated and pretreated by salt water, the hydrochloric acid solution with the mass percentage concentration of 3% -4% is continuously added for regeneration, and the regeneration reaction is as follows:
RNa+HCl→RH+NaCl
and (3) RNA: cation exchange resin
HCl: hydrochloric acid
RH: hydrogen form resin
NaCl: sodium chloride
Controlling the acid consumption to be 1.2 times, controlling the contact time of a hydrochloric acid solution and a resin to be 1-1.5 hours, controlling the flow rate of the hydrochloric acid solution passing through a resin layer to be 4-10 m/h, washing the hydrochloric acid solution with demineralized water, wherein the washing flow rate is 1/2 of the flow rate of the hydrochloric acid solution passing through the resin layer 20 minutes before washing, then increasing the flow rate to be 2 times of the regeneration flow rate for washing, finishing the regeneration operation when the conductivity of a washing outlet is less than 5 mu s/cm, regenerating and transforming the cation exchange resin into a hydrogen resin, discharging the hydrogen resin from an ion regeneration column, controlling water for 2-3 hours, and controlling the water content to be 55-57% for later use;
3.2 regeneration of oxyhydrogen type resin: the anion exchange resin is regenerated by adding sodium hydroxide solution with the mass percent concentration of 4-5% after the treatment and the pretreatment of salt solution, and the regeneration reaction is as follows:
RCl+NaOH→ROH+NaCl
and (3) RNA: anion exchange resin
NaOH: sodium hydroxide
ROH: oxyhydrogen type resin
NaCl: sodium chloride
Controlling the alkali consumption to be 1.2 times, controlling the contact time of the sodium hydroxide solution and the resin to be 1-1.5 hours, controlling the flow rate of the sodium hydroxide solution passing through the resin layer to be 4-10 m/h, washing the sodium hydroxide solution with desalted water, wherein the washing flow rate is 1/2 of the flow rate of the sodium hydroxide solution passing through the resin layer 20 minutes before washing, increasing the flow rate to be 2 times of the regeneration flow rate for washing, finishing the regeneration operation when the conductivity of a washing outlet is less than 5 mu s/cm, regenerating and transforming the anion exchange resin into hydroxide resin, discharging the hydroxide resin from the resin ion regeneration column, controlling the water for 2-3 hours, and controlling the moisture of the hydroxide resin to be 55-57% for later use;
3.3 regeneration of the alkalized resin: after the treatment and pretreatment of the saline solution, the alkalized resin is continuously added with a hydrochloric acid solution with the mass percentage concentration of 3% -4% for regeneration, and the regeneration reaction is as follows:
RNa+HCl→RH+NaCl
and (3) RNA: alkalized resin
HCl: hydrochloric acid
RH: hydrogen form resin
NaCl: sodium chloride
Soaking the alkalized resin for 4-8 hours, then flushing the alkalized resin downstream, discharging the resin with the conductivity of less than 500 mu s/cm, and then adding a sodium hydroxide solution with the mass percent concentration of 4-5% for regeneration, wherein the regeneration reaction is as follows:
RH+NaOH→RNa+H2O
RH: hydrogen form resin
NaOH: sodium hydroxide
And (3) RNA: alkalized resin
H2O: water (W)
Controlling the alkali consumption to be 1.2 times, controlling the contact time of a sodium hydroxide solution and resin to be 1-1.5 hours, flushing the resin layer by adding desalted water into the sodium hydroxide solution, flushing the resin layer at the flow rate of 1/2 when the sodium hydroxide solution passes through the resin layer 20 minutes before flushing, then flushing at the flow rate which is 2 times of the regeneration flow rate, finishing the first stage of regeneration of the alkalized resin when the conductivity of a flushing outlet is less than 50 mu s/cm, controlling the flow rate of the sodium hydroxide solution passing through the resin layer to be 4-10 m/h, continuously flushing by using desalted water with the temperature of 50 ℃ after the first stage of regeneration of the alkalized resin is finished until the conductivity of the outlet is less than 5 mu s/cm, finishing the regeneration of the alkalized resin, discharging the alkalized resin from an ion regeneration column, controlling the water for 2-3 hours, and controlling the water content of the alkalized resin to;
3.4 the resins were mixed according to the following proportions:
according to the mass ratio, the hydrogen type resin: 32%, alkalinizing resin: 8%, mixing the hydrogen resin and the alkalizing resin to ensure uniform mixing, wherein the hydrogen-oxygen resin: and 60% of the components are separately packaged.
When the hydrogen type resin alkalization resin water-cooling system is used in a generator internal cooling water system, according to the operation mode of an ion exchange column of the generator internal cooling water system, a mixture of hydrogen type resin and alkalization resin is added to the front end of water inlet of an ion exchanger according to the water inlet direction of the ion exchanger, and then hydrogen-oxygen type resin is added.
When the generator cold water system runs, the hydrogen-type resin acidifies the generator cold water entering the resin layer and adsorbs adsorbable ionic impurities in the generator cold water. The alkalization resin continuously adsorbs copper compounds contained in the cold water in the generator, and alkaline substances are released into the cold water in the generator according to the principle of ion exchange.
The oxyhydrogen resin at the back half part of the bed layer can improve the pH value of the cold water in the generator through the auxiliary action, so that the pH value is more than 8.0 under the condition that the conductivity of the cold water in the generator is less than 1.5 mu s/cm, the cold water system in the generator is ensured to be in a passivation area to inhibit the copper corrosion of the cold water system in the generator, and the safe and stable operation of a unit is ensured.
The principle of the invention is as follows:
the invention purifies the cold water in the generator by the process of conductivity through deionization, and simultaneously converts the existing state of copper ions in the cold water system in the generator, so that the copper ions are easier to be adsorbed and removed. The special resin has the characteristics of strong binding capacity to metal ions and high adsorption capacity, and can inhibit copper corrosion by performing adsorption exchange on converted copper ions and releasing alkaline substances to adjust the pH value of a cold water system in a generator. Thereby achieving the purpose of ensuring the safe and stable operation of the unit due to the qualified water quality of the rotor internal cooling water system.
The anion, cation and alkalized resins are selected to carry out deep regeneration through a special process, the regeneration degree of the resins is ensured, the transformation rate of the resins is improved, and the exchange capacity of the resins is greatly improved. 3 kinds of resin are filled into an ion exchange unit according to a specific sequence, wherein the ion removal part can purify the water quality of cold water in the generator, the alkalization part can carry out alkalization treatment in an ion exchange mode, and meanwhile, the special resin can carry out targeted adsorption removal on copper ions in the cold water.
According to the specific filling sequence, the copper compound contained in the generator cold water is converted and digested in the process of passing through the resin layer, so that copper ions contained in the generator cold water are more easily adsorbed by the special resin for the generator cold water.
The special resin for cold water in the generator can generate alkalified substances in the ion exchange process. The pH value of the cold water in the generator is adjusted simultaneously in the process of removing copper ions, so that the pH value is more than 8.0 under the condition that the conductivity of the cold water in the generator is less than 1.5 mu s/cm, the cold water system in the generator is ensured to be in a passivation area to inhibit the copper corrosion of the cold water system in the generator, and the safe and stable operation of the unit is ensured.
The invention has the technical effects that:
the special resin for the cold water in the generator consists of anion resin, cation resin and alkalization resin, and the three resins are mixed according to a certain proportion and are filled according to a specific sequence. The functionality is divided into two parts: one part is used for removing ions to reduce the conductivity to purify cold water in the generator. The other part is to release alkaline substances by using an ion exchange mode to improve the pH value of cold water in the generator.
The hydrogen resin and the alkalization resin in the special resin for the cold water in the generator are mixed according to the mass ratio of 32% to 8%, and the mixture of the hydrogen resin and the alkalization resin is added to the water inlet front end of the ion exchanger according to the water inlet direction of the ion exchanger and then added with the hydroxide resin with the mass ratio of 60% according to the operation mode of an ion exchange column of a cold water system in the generator.
The hydrogen-type resin acidifies cold water entering the generator in the resin layer and adsorbs ionic impurities which can be adsorbed in the cold water. The alkalization resin continuously adsorbs copper compounds contained in the cold water in the generator, and alkaline substances are released into the cold water in the generator according to the principle of ion exchange.
The oxyhydrogen resin at the back half part of the bed layer can improve the pH value of the cold water in the generator through the auxiliary action, so that the pH value is more than 8.0 under the condition that the conductivity of the cold water in the generator is less than 1.5 mu s/cm, the cold water system in the generator is ensured to be in a passivation area to inhibit the copper corrosion of the cold water system in the generator, and the safe and stable operation of a unit is ensured.
The resin preparation process comprises the steps of salt solution treatment, pretreatment and resin regeneration in sequence, and the resin is converted into different forms, so that the resin achieves the best use effect.
The salt solution treatment makes the resin fully swell to prevent the resin from cracking after sudden swelling, thereby reducing the mechanical strength of the resin.
And removing inorganic impurities and organic impurities in the resin in the pretreatment process.
In the regeneration process of the resin, the anion-cation exchange resin is respectively transformed into the required hydrogen type resin, oxyhydrogen type resin and alkalization resin. The resin can reach a complete regeneration state by controlling the consumption proportion of the regeneration liquid, and a higher exchange capacity is obtained. And in the regeneration process, the resin is made to accord with the on-site operation condition in a hot washing mode, and can be put into a cold water system in a generator to be operated and adjusted at the highest speed.
The specific implementation mode is as follows:
the special resin for the cold water in the generator comprises the following components in percentage by mass:
hydrogen type resin: 32 percent of
Hydroxyl type resin: 60 percent of
Alkalizing resin: 8 percent of
According to the mass ratio, the hydrogen type resin: 32%, alkalinizing resin: 8 percent, mixing the hydrogen resin and the alkalizing resin to ensure uniform mixing. Hydroxyl type resin: and 60% of the components are separately packaged.
The special resin for the cold water in the generator is prepared by the following steps:
1. and (3) saline solution treatment:
filling ion exchange resin into an ion regeneration column, filling 1/3-1/2 parts with the height of the whole height of the ion regeneration column, washing the resin layer at high speed by adopting a bottom water inlet mode, controlling the flow rate of a washing section at 10-60 m/h, loosening the resin layer, clearing mechanical impurities and finely-crushed resin powder in the resin, enabling the resin layer to be uniformly distributed without bubble inclusion and improving the regeneration effect, wherein the washing time is 40 minutes, adding a sodium chloride solution with the mass percentage concentration of 10% which is 2 times of the volume of the resin from the top of the ion exchange column for soaking, the soaking time is 1-2 hours, and feeding desalted water from the top of the ion regeneration column for washing until the discharged water is clear and not turbid;
2, pretreatment:
2.1 treating the cation exchange resin with salt solution, continuously adding sodium hydroxide solution with the mass percentage concentration of 2-4% from the top of the ion regeneration column, soaking the resin for 4-8 hours, then carrying out downstream flushing on the resin layer, and carrying out standby after the discharge conductivity of flushing is less than 500 mu s/cm;
2.2 treating the anion exchange resin with saline solution, continuously adding a hydrochloric acid solution with the mass percentage concentration of 5% from the top of the ion regeneration column, soaking the resin for 4-8 hours, then carrying out downstream washing on the resin layer, and carrying out standby after the discharge conductivity of washing is less than 500 mu s/cm;
3. resin regeneration:
3.1 regeneration of hydrogen resin: after the cation exchange resin is treated and pretreated by salt water, the hydrochloric acid solution with the mass percentage concentration of 3% -4% is continuously added for regeneration, and the regeneration reaction is as follows:
RNa+HCl→RH+NaCl
and (3) RNA: cation exchange resin
HCl: hydrochloric acid
RH: hydrogen form resin
NaCl: sodium chloride
Controlling the acid consumption to be 1.2 times, controlling the contact time of a hydrochloric acid solution and a resin to be 1-1.5 hours, controlling the flow rate of the hydrochloric acid solution passing through a resin layer to be 4-10 m/h, washing the hydrochloric acid solution with demineralized water, wherein the washing flow rate is 1/2 of the flow rate of the hydrochloric acid solution passing through the resin layer 20 minutes before washing, then increasing the flow rate to be 2 times of the regeneration flow rate for washing, finishing the regeneration operation when the conductivity of a washing outlet is less than 5 mu s/cm, regenerating and transforming the cation exchange resin into a hydrogen resin, discharging the hydrogen resin from an ion regeneration column, controlling water for 2-3 hours, and controlling the water content to be 55-57% for later use;
3.2 regeneration of oxyhydrogen type resin: the anion exchange resin is regenerated by adding sodium hydroxide solution with the mass percent concentration of 4-5% after the treatment and the pretreatment of salt solution, and the regeneration reaction is as follows:
RCl+NaOH→ROH+NaCl
and (3) RNA: anion exchange resin
NaOH: sodium hydroxide
ROH: oxyhydrogen type resin
NaCl: sodium chloride
Controlling the alkali consumption to be 1.2 times, controlling the contact time of the sodium hydroxide solution and the resin to be 1-1.5 hours, controlling the flow rate of the sodium hydroxide solution passing through the resin layer to be 4-10 m/h, washing the sodium hydroxide solution with desalted water, wherein the washing flow rate is 1/2 of the flow rate of the sodium hydroxide solution passing through the resin layer 20 minutes before washing, increasing the flow rate to be 2 times of the regeneration flow rate for washing, finishing the regeneration operation when the conductivity of a washing outlet is less than 5 mu s/cm, regenerating and transforming the anion exchange resin into hydroxide resin, discharging the hydroxide resin from the resin ion regeneration column, controlling the water for 2-3 hours, and controlling the moisture of the hydroxide resin to be 55-57% for later use;
3.3 regeneration of the alkalized resin: after the treatment and pretreatment of the saline solution, the alkalized resin is continuously added with a hydrochloric acid solution with the mass percentage concentration of 3% -4% for regeneration, and the regeneration reaction is as follows:
RNa+HCl→RH+NaCl
and (3) RNA: alkalized resin
HCl: hydrochloric acid
RH: hydrogen form resin
NaCl: sodium chloride
Soaking the alkalized resin for 4-8 hours, then flushing the alkalized resin downstream, discharging the resin with the conductivity of less than 500 mu s/cm, and then adding a sodium hydroxide solution with the mass percent concentration of 4-5% for regeneration, wherein the regeneration reaction is as follows:
RH+NaOH→RNa+H2O
RH: hydrogen form resin
NaOH: sodium hydroxide
And (3) RNA: alkalized resin
H2O: water (W)
Controlling the alkali consumption to be 1.2 times, controlling the contact time of a sodium hydroxide solution and resin to be 1-1.5 hours, flushing the resin layer by adding desalted water into the sodium hydroxide solution, flushing the resin layer at the flow rate of 1/2 when the sodium hydroxide solution passes through the resin layer 20 minutes before flushing, then flushing at the flow rate which is 2 times of the regeneration flow rate, finishing the first stage of regeneration of the alkalized resin when the conductivity of a flushing outlet is less than 50 mu s/cm, controlling the flow rate of the sodium hydroxide solution passing through the resin layer to be 4-10 m/h, continuously flushing by using desalted water with the temperature of 50 ℃ after the first stage of regeneration of the alkalized resin is finished until the conductivity of the outlet is less than 5 mu s/cm, finishing the regeneration of the alkalized resin, discharging the alkalized resin from an ion regeneration column, controlling the water for 2-3 hours, and controlling the water content of the alkalized resin to;
3.4 the resins were mixed according to the following proportions:
according to the mass ratio, the hydrogen type resin: 32%, alkalinizing resin: 8%, mixing the hydrogen resin and the alkalizing resin to ensure uniform mixing, wherein the hydrogen-oxygen resin: and 60% of the components are separately packaged.
When the hydrogen type resin alkalization resin water-cooling system is used in a generator internal cooling water system, according to the operation mode of an ion exchange column of the generator internal cooling water system, a mixture of hydrogen type resin and alkalization resin is added to the front end of water inlet of an ion exchanger according to the water inlet direction of the ion exchanger, and then hydrogen-oxygen type resin is added.
When the generator cold water system runs, the hydrogen-type resin acidifies the generator cold water entering the resin layer and adsorbs adsorbable ionic impurities in the generator cold water. The alkalization resin continuously adsorbs copper compounds contained in the cold water in the generator, and alkaline substances are released into the cold water in the generator according to the principle of ion exchange.
The oxyhydrogen resin at the back half part of the bed layer can improve the pH value of the cold water in the generator through the auxiliary action, so that the pH value is more than 8.0 under the condition that the conductivity of the cold water in the generator is less than 1.5 mu s/cm, the cold water system in the generator is ensured to be in a passivation area to inhibit the copper corrosion of the cold water system in the generator, and the safe and stable operation of a unit is ensured.
Claims (2)
1. The special resin for the generator inner cooling water is characterized in that: comprises the following components in percentage by mass:
hydrogen type resin: 32 percent of
Hydroxyl type resin: 60 percent of
Alkalizing resin: 8 percent.
2. The preparation method of the special resin for the cold water in the generator is characterized by comprising the following steps of:
1. and (3) saline solution treatment:
filling ion exchange resin into an ion regeneration column, filling 1/3-1/2 parts with the height of the whole height of the ion regeneration column, washing the resin layer at high speed by adopting a bottom water inlet mode, controlling the flow rate of a washing section at 10-60 m/h, loosening the resin layer, clearing mechanical impurities and finely-crushed resin powder in the resin, enabling the resin layer to be uniformly distributed without bubble inclusion and improving the regeneration effect, wherein the washing time is 40 minutes, adding a sodium chloride solution with the mass percentage concentration of 10% which is 2 times of the volume of the resin from the top of the ion exchange column for soaking, the soaking time is 1-2 hours, and feeding desalted water from the top of the ion regeneration column for washing until the discharged water is clear and not turbid;
2. pretreatment:
2.1 treating the cation exchange resin with salt solution, continuously adding sodium hydroxide solution with the mass percentage concentration of 2-4% from the top of the ion regeneration column, soaking the resin for 4-8 hours, then carrying out downstream flushing on the resin layer, and carrying out standby after the discharge conductivity of flushing is less than 500 mu s/cm;
2.2 treating the anion exchange resin with saline solution, continuously adding a hydrochloric acid solution with the mass percentage concentration of 5% from the top of the ion regeneration column, soaking the resin for 4-8 hours, then carrying out downstream washing on the resin layer, and carrying out standby after the discharge conductivity of washing is less than 500 mu s/cm;
3. resin regeneration:
3.1 regeneration of hydrogen resin: after the cation exchange resin is treated and pretreated by salt water, the hydrochloric acid solution with the mass percentage concentration of 3% -4% is continuously added for regeneration, and the regeneration reaction is as follows:
RNa+HCl→RH+NaCl
and (3) RNA: cation exchange resin
HCl: hydrochloric acid
RH: hydrogen form resin
NaCl: sodium chloride
Controlling the acid consumption to be 1.2 times, controlling the contact time of a hydrochloric acid solution and a resin to be 1-1.5 hours, controlling the flow rate of the hydrochloric acid solution passing through a resin layer to be 4-10 m/h, washing the hydrochloric acid solution with demineralized water, wherein the washing flow rate is 1/2 of the flow rate of the hydrochloric acid solution passing through the resin layer 20 minutes before washing, then increasing the flow rate to be 2 times of the regeneration flow rate for washing, finishing the regeneration operation when the conductivity of a washing outlet is less than 5 mu s/cm, regenerating and transforming the cation exchange resin into a hydrogen resin, discharging the hydrogen resin from an ion regeneration column, controlling water for 2-3 hours, and controlling the water content to be 55-57% for later use;
3.2 regeneration of oxyhydrogen type resin: the anion exchange resin is regenerated by adding sodium hydroxide solution with the mass percent concentration of 4-5% after the treatment and the pretreatment of salt solution, and the regeneration reaction is as follows:
RCl+NaOH→ROH+NaCl
and (3) RNA: anion exchange resin
NaOH: sodium hydroxide
ROH: oxyhydrogen type resin
NaCl: sodium chloride
Controlling the alkali consumption to be 1.2 times, controlling the contact time of the sodium hydroxide solution and the resin to be 1-1.5 hours, controlling the flow rate of the sodium hydroxide solution passing through the resin layer to be 4-10 m/h, washing the sodium hydroxide solution with desalted water, wherein the washing flow rate is 1/2 of the flow rate of the sodium hydroxide solution passing through the resin layer 20 minutes before washing, increasing the flow rate to be 2 times of the regeneration flow rate for washing, finishing the regeneration operation when the conductivity of a washing outlet is less than 5 mu s/cm, regenerating and transforming the anion exchange resin into hydroxide resin, discharging the hydroxide resin from the resin ion regeneration column, controlling the water for 2-3 hours, and controlling the moisture of the hydroxide resin to be 55-57% for later use;
3.3 regeneration of the alkalized resin: after the treatment and pretreatment of the saline solution, the alkalized resin is continuously added with a hydrochloric acid solution with the mass percentage concentration of 3% -4% for regeneration, and the regeneration reaction is as follows:
RNa+HCl→RH+NaCl
and (3) RNA: alkalized resin
HCl: hydrochloric acid
RH: hydrogen form resin
NaCl: sodium chloride
Soaking the alkalized resin for 4-8 hours, then flushing the alkalized resin downstream, discharging the resin with the conductivity of less than 500 mu s/cm, and then adding a sodium hydroxide solution with the mass percent concentration of 4-5% for regeneration, wherein the regeneration reaction is as follows:
RH+NaOH→RNa+H2O
RH: hydrogen form resin
NaOH: sodium hydroxide
And (3) RNA: alkalized resin
H2O: water (W)
Controlling the alkali consumption to be 1.2 times, controlling the contact time of a sodium hydroxide solution and resin to be 1-1.5 hours, flushing the resin layer by adding desalted water into the sodium hydroxide solution, flushing the resin layer at the flow rate of 1/2 when the sodium hydroxide solution passes through the resin layer 20 minutes before flushing, then flushing at the flow rate which is 2 times of the regeneration flow rate, finishing the first stage of regeneration of the alkalized resin when the conductivity of a flushing outlet is less than 50 mu s/cm, controlling the flow rate of the sodium hydroxide solution passing through the resin layer to be 4-10 m/h, continuously flushing by using desalted water with the temperature of 50 ℃ after the first stage of regeneration of the alkalized resin is finished until the conductivity of the outlet is less than 5 mu s/cm, finishing the regeneration of the alkalized resin, discharging the alkalized resin from an ion regeneration column, controlling the water for 2-3 hours, and controlling the water content of the alkalized resin to;
3.4 the resins were mixed according to the following proportions:
according to the mass ratio, the hydrogen type resin: 32%, alkalinizing resin: 8%, mixing the hydrogen resin and the alkalizing resin to ensure uniform mixing, wherein the hydrogen-oxygen resin: and 60% of the components are separately packaged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010883535.3A CN111943318A (en) | 2020-08-28 | 2020-08-28 | Special resin for generator inner cooling water and preparation method thereof |
Applications Claiming Priority (1)
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Cited By (1)
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| CN112851835A (en) * | 2021-03-10 | 2021-05-28 | 上海核工程研究设计院有限公司 | Device for preparing strong acid sodium type resin |
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