CN1069227C - Resin processing system - Google Patents

Abstract

The present invention relates to a resin treatment method and provides a resin treatment system based on the method, which belongs to the technical field of water treatment. ) together to form a multiphase centrifugal flow rotating along the inner wall of the tank, combining the functions of multiphase centrifugal flow, appropriate screen tube and chemical agent to treat the depleted resin, with fast processing speed and low chemical agent consumption The advantages of small amount and uniform particles are especially suitable for treating the depleted resin produced by the condensate polishing system.

Description

Resin Handling System

The invention relates to a resin treatment (cleaning and regeneration) method and provides a resin treatment system based on the method, belonging to the technical field of water treatment.

The ion exchange resin used in the condensate polishing system, its exchange function will be exhausted due to surface contamination and/or it has absorbed a sufficient amount of solute ions, and can no longer filter out solutes in water. At this time, it is necessary to The resin is treated to restore its functionality. In the background art, the treatment of spent resin (cation resin or anion resin) is cleaning and regeneration. Cleaning refers to backwashing and air scrubbing, and regeneration refers to adding chemicals to continue cleaning after cleaning: the depleted resin is cation resin, and acid, such as sulfuric acid is added; the depleted resin is anion resin, and alkali, such as caustic soda, is added. The effluent quality and effluent cycle of the condensate polishing system in a thermal power plant are directly related to the cleanliness and regeneration of the resin used.

During the backwashing process, the resin particles roll and rub against each other under the action of the backwash water flow. Because the buoyancy of the resin particles in the water is slightly less than its own weight, the pressure between the particles is small, and the mutual friction can only scrape a small amount attached to the resin. The dirt residue on the surface of the particles, so the backwashing process takes a lot of time and the cleaning effect is poor. When the pollution is serious, such as the surface of the resin particles is covered with rust or gel-like silica gel, the backwashing process will take more time. In fact, in the resin treatment technology, the backwashing process is sometimes not used for cleaning purposes, but for the depleted mixed resin to be deposited and stratified into positive resin layer, mixed resin layer and negative resin layer under the action of backflushing water flow. In the process of air scrubbing, air is blown into the water for cleaning the resin, causing the resin particles to roll in the water and rub against each other. Due to the expansion of the air bubbles, the pressure between the particles is not large, and the friction can only scrape a small amount of particles attached to the surface of the resin particles. Dirt residue, plus the air bubble itself is extremely light in weight, the ability to scrape dirt residue is extremely limited, and resin particles cannot be cleaned, so the air scrubbing process takes a long time and the cleaning effect is also poor. In addition, backwashing and air scrubbing processes have the disadvantage of being difficult to sieve resin pellet fines, debris, and scum fines scraped from resin pellet surfaces.

The regeneration process is to flow the chemical agent (acid or lye) through the resin column (positive resin column or negative resin column) in a laminar flow. Since the resin particles are tightly pressed together, their surfaces cannot be completely in contact with the chemical agent, resulting in The reaction is slow, so the regeneration process takes a long time. In addition, a large amount of chemical agents are discharged out of the regeneration tank without complete reaction, resulting in waste of chemical agents and low regeneration efficiency. The regeneration efficiency refers to the ratio of the exchange capacity of the regenerated resin to the consumption of chemicals, which is generally only 33%, and can be as low as about 10%. Up to about 10 kg. Generally speaking, the time for resin treatment (cleaning and regeneration) needs at least 8 hours, and even, some methods, such as the whole regeneration process of ammoniated resin, need as long as 10 hours to meet the water quality required by power plant operation.

The object of the present invention is to provide a method for resin treatment (cleaning and regeneration) which does not have the disadvantages of the background art.

Another object of the present invention is to provide a resin treatment system operating on the basis of the above method.

The resin treatment method that the present invention relates to comprises following eight steps, belongs to four processes respectively:

(process 1, cleaning)

Step 1 The resin is processed in a cylindrical closed tank;

Step 2 Introduce the centrifugal water flow into the tank;

The third step is to introduce the exhausted resin (positive resin or negative resin) particles into the tank;

Step 4 The centrifugal water flow and the resin particles form a multiphase centrifugal flow rotating along the inner wall of the tank, resulting in:

(1) All the resin particles are close to the inner wall of the tank, the normal pressure between the particles is large, the centrifugal water flow makes the particles roll, and rub against each other in the tangential direction, the large normal pressure helps to adhere to the particles under scraping The dirt residue on the surface, the scraped dirt residue is fine debris;

(2) The resin particles are divided into three layers from the inner wall of the tank according to the particle size: the large particles are close to the inner wall of the tank to form the outer layer, the medium particles are close to the outer layer to form the middle layer, and the resin fines and fragments are close to the middle layer. constitute the inner layer;

(3) Dirt slag fines and other impurity particles automatically enter the inner layer;

Step 5 Resin fines, debris, slag fines and other impurities are discharged out of the groove through a sieve tube with appropriate sieve hole size installed in the inner layer;

(process 2, regeneration)

Step 6: Introduce the chemical agent into the tank, and the stirring effect of the multiphase centrifugal flow makes the surface of each resin particle fully contact with the chemical agent and ensures that the chemical agent around each resin particle can be updated in time, resulting in a rapid reaction and a regeneration process Less time-consuming, less chemical consumption;

(process 3, then wash)

Step 7 Stop supplying chemicals to the tank and continue cleaning to wash away the chemicals adsorbed by the resin particles;

(Process 4, draining and draining resin)

Step 8 Drain the water first, and then discharge the treated (clean surface, uniform particles and ion exchange capacity) resin particles from the tank.

Accompanying drawing 1 is the structural representation of the resin processing system that the present invention relates to, and wherein 1 is a centrifugal outflow outlet, 2 is a centrifugal outflow water screen pipe, 3 is a tank, 4 is a resin outlet, 5 is a drainage network pipe, 6 is a water outlet, 7 is a water inlet pipe, 8 is a resin inlet, 9 is a water inlet pipe inlet, 10 is a chemical agent inlet, and 11 is a nozzle.

The resin processing device involved in the present invention is mainly composed of a centrifugal outlet 1, a centrifugal outlet water screen 2, a barrel tank 3, a resin outlet 4, a drainage network pipe 5, a water outlet 6, a water inlet pipe 7, a resin inlet 8, and a water inlet pipe inlet 9. The chemical agent inlet 10 and the nozzle 11 are composed. The tank 3 is a cylindrical closed tank, which can be placed upright or horizontally as a resin treatment tank, but it is more advantageous to place it upright in application. The centrifugal effluent screen pipe 2 is mainly composed of a hollow skeleton and a wedge-shaped winding wire uniformly coiled on the hollow skeleton. The distance between adjacent windings and the distance between adjacent lattice rods on the hollow skeleton depends on the treatment of resin particles. The size should be slightly smaller than the diameter of medium-sized resin particles, its lower end is closed, and its upper end is connected with the centrifugal outlet 1. The central axis of the centrifugal effluent screen 2 is parallel to the central axis of the tank 3 , in other words, the centrifugal effluent screen 2 is installed in the inner layer. The water inlet pipe 7 is located on the opposite side of the centrifugal effluent screen pipe 2, and it is on the same plane as the central axes of the centrifugal effluent water screen pipe 2 and the barrel tank 3, and is parallel to each other. The lower end of water inlet pipe 7 is closed, and nozzle 11 is arranged on the pipe wall near the lower end, and the central axis of nozzle 11 is perpendicular to above-mentioned plane, in other words, nozzle 11 can eject the centrifugal water flow perpendicular to this plane. The upper end of water inlet pipe 7 is connected with water inlet pipe inlet 9. The centrifugal outlet 1 is located on one side of the upper half of the barrel tank 3, and the water inlet pipe inlet 9 is located on the opposite side of the upper half of the barrel tank 3 to the centrifugal outlet 1. The chemical agent inlet 10 and the resin outlet 4 are respectively located at the top and the bottom of the tank. The resin inlet 8 and the water outlet 6 are respectively located at the middle upper part and the lower part of one side of the bucket tank 3 . The drainage network pipe 5 mainly includes two parts: the part connected with the lower end of the drain outlet 6 is a screen whose mesh size is smaller than the diameter of medium-sized resin particles, and the remaining part plays the role of supporting and fixing the lower end of the drain outlet 6. The size of the mesh hole is Much larger than the diameter of large resin particles.

The work of the system involved in the present invention is based on the resin treatment method involved in the present invention:

(process 1, cleaning)

Step 1 Resin is processed in tank 3;

Step 2: Open the valve (not shown) on the inlet 9 of the water inlet, and the water will be sprayed from the nozzle 11 in the form of centrifugal water flow through the inlet 9 of the water inlet and the water inlet 7, and then enter the tank 3, in order to make the centrifugal water flow It has sufficient kinetic energy and can use the pressure generated by the natural water level of the water supply source. If the pressure is insufficient, a water pump should be used to pressurize;

The 3rd step Open the valve (not shown) on the resin inlet 8, the exhausted resin (positive resin or anion resin) and water flow into the barrel tank 3 through the resin inlet 8 together, and the amount of resin to be treated once is input, close the valve valve;

Step 4 The centrifugal water flow together with the resin particles forms a multiphase centrifugal flow rotating along the inner wall of the tank 3, resulting in:

(1) All the resin particles are close to the inner wall of the barrel tank 3, the normal pressure between the particles is large, the particles roll under the drive of the centrifugal water flow, and rub against each other in the tangential direction, the large normal pressure is helpful for scraping Wipe off the dirt and residue attached to the surface of the particles, and the scraped dirt and residue are fine debris;

(2) The resin particles are divided into three layers from the inner wall of the barrel tank 3 according to the particle size: the large particles are close to the inner wall of the barrel tank 3 to form the outer layer, the medium particles are close to the outer layer to form the middle layer, and the resin fines and debris Blocks cling to the middle layer to form the inner layer;

(3) Dirt slag fines and other impurity particles automatically enter the inner layer;

Step 5 The centrifugal effluent screen tube 2 with an appropriate sieve hole size is just installed in the inner layer. When the tank 3 is full, the water pressure in the tank 3 forces the water and various fines in the centrifugal outlet water screen 2 to be discharged out of the tank 3 through the centrifugal outlet 1;

(process 2, regeneration)

Step 6 Open the valve (not shown) on the chemical agent inlet 10, the chemical agent enters the tank 3 through the chemical agent inlet 10, and the multiphase centrifugal flow stirs the chemical agent evenly to ensure that the surface energy of each resin particle is consistent with the chemical agent Full contact and timely renewal of chemicals around each resin particle, resulting in fast response, less time-consuming regeneration process, and reduced chemical consumption;

(process 3, then wash)

Step 7 Close the valve on the chemical agent inlet 10, stop supplying the chemical agent to the tank 3, and continue cleaning to wash away the chemical agent adsorbed by the resin particles.

(Process 4, draining and draining resin)

Step 8 Open the valve (not shown) on the drain port 6, close the valve on the inlet 9 of the water inlet pipe, the centrifugal water flow stops flowing, and the resin particles that were originally close to the inner wall of the tank 3 are under the action of gravity , settle down to the bottom of the bucket tank 3 through the large screen hole of the drainage network pipe 5. The water in the barrel tank 3 is discharged through the drain port 6, and the small screen hole of the drainage network pipe 5 blocks the resin particles (both large and medium-sized), preventing them from being discharged with the water. When the water level of the water in the bucket tank 3 was the same as the height of the horizontal pipe of the drain port 6, the drainage ended. Open the valve (not shown) on the resin outlet 4, and the resin particles that have been processed (clean surface, uniform particle and ion exchange capacity) and the water remaining in the tank 3 are discharged outside the tank 3 through the resin outlet 4 together.

Every time the system involved in the present invention is used for a period of time, the screen holes of the centrifugal outflow water screen pipe 2 and the drainage network pipe 5 will be blocked by resin particles, and these resin particles need to be removed intermittently to keep the screen pipe unimpeded. Blow dry the resin particles clogged in the sieve holes, and the dried resin particles will shrink in volume and fall off from the sieve holes.

Compared with background technology, the present invention has following advantage and positive effect:

1. It takes at least 8 hours to process the resin with the background technology, but it can save a lot of time when the system of the present invention is used to process the resin.

2. Treat the resin with the background technology, and the chemical agent consumption is 3 to 10 times of the exhausted resin exchange capacity, and use the device related to the present invention to process the resin, and the chemical agent consumption will be reduced.

3. process resin with the system that the present invention relates to, can screen out fine chips and fragments of resin, the resin after processing, particle uniformity is good, can prolong the service life of resin, in addition, resin does not contain fine chips and debris in resin Fragments will not cause additional pressure drop, so that the effective energy of the water pump of the condensate polishing system can be mainly used for the outlet water of the suction system, which directly ensures the stable water output of the system and indirectly ensures the stability of the outlet water quality.

4. The method and equipment involved in the present invention do not contain an air scrubbing process and do not require fan equipment, which not only reduces equipment investment and operating costs, but also saves energy.

The present invention is because of having above-mentioned advantages, so be particularly suitable for being used for the condensed water polishing treatment system of thermal power or nuclear power plant to handle exhausted resin (positive resin or negative resin) or clean (cancel the 6th step of the method that the present invention relates to) Exhausted mixed resins can also be used in any technical field to clean particles of solid matter whose surfaces are physically contaminated. It is a promising new technology for processing resins.

Claims (4)

1. plastic resin treatment method, it is characterized in that: it comprises eight steps, belongs to four processes respectively:

Process one is cleaned

The 1st step resin is handled in columnar closed vat groove;

The 2nd step was introduced the bucket groove to centrifugal current;

The 3rd step was introduced the bucket groove to depleted resin particle;

Centrifugal current of the 4th step form along the heterogeneous centrifugal stream of bucket groove inwall rotation with resin particle, cause:

(1) all resin particles are close to a barrel groove inwall, intergranular normal pressure is big, and particle rolls under the driving of centrifugal current, and rubs mutually on tangential direction, normal pressure helps scraping down attached to the lip-deep dirty slag of a grain greatly, and the dirty slag that scrapes is a fines;

(2) resin particle is divided into three layers by granular size inward from bucket groove inwall: macrobead is close to a barrel groove inwall, constitutes skin, and middle particle is close to skin, constitutes the middle level, and fines, the fragment of resin are close to the middle level, constitutes internal layer;

(3) dirty slag fines and other impurity grains bits enter internal layer automatically;

The 5th step resin fines, fragment, dirty slag fines and the suitable screen casing of the screen size of other impurity grains bits in being installed in internal layer are discharged outside the bucket groove;

Process two, regeneration

The 6th step was introduced the bucket groove to chemical agent, heterogeneous centrifugal stream stirs chemical agent, guaranteeing that every grainy resin particulate surface energy and chemical agent contact fully with the circumgranular chemical agent of every grainy resin can upgrade in time, cause speed of response fast, regenerative process few and chemical agent consumption minimizing consuming time;

Process three is cleaned again

The 7th step stopped to bucket groove supplying chemical medicament, continued to clean, with the chemical agent of flush away resin particle absorption.

Process four, draining and row's resin

The 8th first draining of step is discharged the resin particle that disposes then from the bucket groove.

2. plastic resin treatment method according to claim 1 is characterized in that, has enough kinetic energy for making centrifugal current, can utilize the pressure of the natural water level generation of water-supply source, as insufficient pressure, should adopt the water pump pressurization.

3. a job is based on the resin processing system of the described method of claim 1, mainly by centrifugal spout (1), centrifugal outflow water sieve pipe (2), bucket groove (3), resin outlet (4), Drain pipe network (5), water port (6), water inlet pipe (7), resin inlet (8), water inlet pipe import (9), chemical agent import (10) and nozzle (11) are formed, it is characterized in that, bucket groove (3) is a columnar closed vat groove, centrifugal outflow water sieve pipe (2) mainly is made up of hollow skeleton and the wedge shape wrapping wire that evenly is coiled on the bar that spreads out of hollow skeleton, adjacent distance of spreading out between bar on distance between adjacent turn and the hollow skeleton should be slightly less than the diameter of median size resin particle, the lower end closed of this screen casing, the upper end of this screen casing is connected with centrifugal spout (1), this screen casing axis is parallel with the axis of bucket groove (3), promptly this screen casing is installed among the internal layer, water inlet pipe (7) is positioned at the opposite of centrifugal outflow water sieve pipe (2), this pipe and centrifugal outflow water sieve pipe (2), bucket groove (3) three's axis is on same plane, and be parallel to each other, the lower end closed of this pipe, on the tube wall of nearly lower end, nozzle (11) is arranged, the axis of nozzle (11) is vertical with above-mentioned plane, the upper end of this pipe is connected with water inlet pipe import (9), centrifugal spout (1) is positioned at a side of a barrel groove (3) first half, water inlet pipe import (9) is positioned at a barrel groove (3) first half and the relative opposite side of centrifugal spout (1), chemical agent import (10) exports top and the bottom that (4) lay respectively at a barrel groove (3) with resin, resin inlet (8) and water port (6) lay respectively at the upper middle and the part on the lower side of a side of a barrel groove (3), Drain pipe network (5) mainly comprises two parts: with water shoot (6) connection portion, lower end be screen cloth, the size of its sieve aperture is less than the diameter of median size resin particle, all the other play a part to support and fixedly the size of the sieve aperture of the part of water port (6) lower end much larger than the diameter of macrobead resin particle.

4. resin processing system according to claim 3 is characterized in that, bucket groove (3) can be uprightly or the accumbency mode place.