IPC classes for russian patent Installation for preparation of desalinated water for synthesis-gas production. RU patent 2506233. (RU 2506233):
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FIELD: chemistry.
SUBSTANCE: invention relates to technologies of purification of water from natural springs for their further application as initial water for obtaining vapour in processes of steam or vapour-oxygen conversion of hydrocarbon gases (synthesis-gas production). Installation for preparation of desalinated water contains successively connected heat exchanger for heating initial water, unit of preliminary clarification, unit of ultrafiltration, unit of ultraviolet decontamination, unit of filters with filtration degree not more than 5 mcm and unit of two-step reverse osmosis.
EFFECT: invention ensures increase of service term of ultrafiltration and reverse osmosis membranes, water decontamination.
5 cl, 1 dwg
The invention refers to the technology of water purification natural sources for their further use as initial water for steam generation in the processes of vapor or steam-oxygen conversion of hydrocarbon gases (synthesis gas production).
In the technologies of the production of synthesis-gas feedstock is a mixture of hydrocarbon gases and water vapor. To produce steam, you must use water of a high degree of purification. There are many methods of water purification, but currently are the most effective methods are based on membrane technologies (ultrafiltration, reverse osmosis).
As a source of initial water use natural water, as a rule, the nearest river or groundwater. The qualitative and quantitative indicators of pollution inherent to considerable seasonal fluctuations. During periodic worsening of quality of natural water in flood periods may experience problems with the production of synthesis-gas desalted water. In this case, some cleaning technology with the use of membranes may not provide the proper quality, or the necessary amount, or will work on critical loads with a high consumption of filter elements, chemicals, reduction of the life of the membrane, and also increase of process effluent.
In addition it is worth noting that during the production of synthesis-gas from economic considerations, water treatment should be carried out directly in the installations for the production of synthesis gas and served by the personnel of these same facilities. When choosing a water treatment technology, it imposes additional requirements. First, there must be maximum compactness of the equipment, secondly, simplicity of exploitation and service without attraction of specialists of narrow profile of water treatment.
Known plant for the preparation of demineralized water (EN 78183 U), consisting of a sequence of modules included preliminary preparation of water, reverse osmosis module, decarbonization, hearth, module ion-exchange softening and EDI. Module decarbonization can be made, in particular, in the form of a system of membrane degassing.
Known membrane unit for the preparation of water (EN 56374 U), consisting of the module ultrafiltration, the module first stage reverse osmosis module of the second stage reverse osmosis module electrodeionization, control softener, pumps and systems membrane .
Known equipment for water (EN 62923 U), consisting of a block of preliminary preparation of water (installation of direct-flow coagulation with filtration at multilayer, granular downloading or installing UF), nanofiltration unit, block reverse osmosis unit softening nanofiltration unit, block adjustment of the pH.
The disadvantages of these schemes are:
- complex technological scheme, as a result, difficulties in maintenance and operation, large geometrical dimensions;
- high cost of treated water;
- high production costs due to water the rapid breakdown of expensive membranes, because there is no pre-clarification of water (for example, methods of coagulation and sedimentation) in front of the ultrafiltration unit;
- the use of certain types of flocculants leads to reduced service life of ultrafiltration membranes;
- low reliability of the technology, in the period of deterioration in the quality of source water;
Known water treatment system (EN 79096 U)containing pipelines from the water intake to the consumer on the flow of purified water, tank cumulative buffer, the capacity of the gas removal, block membrane flow-through filters reaction chamber ozonization, camera, the capacity of the chemical treatment of metal oxides, filter clarifying, second buffer tank, tank of clean water and block ultraviolet disinfection, between the second buffer tank and reservoir of pure water laid parallel pipeline on which consistently placed an additional block ultraviolet disinfection and block reverse osmosis membrane separation.
Disadvantages of the known installation are:
- the use of coagulants low concentration in the block clarifier, which leads to excess transportation costs;
- absence of effective scheme of separation of the flakes with coagulated particles in a block of lightening;
- absence of schemes of automatic regulation of pH environment in the block of preliminary clarification of water;
- absence block ultrafiltration, which leads to premature failure of the reverse osmosis unit.
Closest to the proposed a unit for the desalination of water, carrying out coagulation/flocculation with the settlement of colloidal particles and impurities, pre-filtering, ultrafiltration and processing of reverse osmosis. The installation includes a series-connected capacity for coagulation and sedimentation, pre-filter, ultrafiltration unit, office of the reverse osmosis (CN 101973655, pub. 16.02.2011).
Disadvantages of the known installation are:
- the use of certain types of flocculants leads to reduced service life of ultrafiltration membranes;
- inefficient mode of coagulation and sedimentation of colloidal particles in the block of preliminary clarification of water due to the lack of aeration of the water and the effective scheme of separation of the flakes with coagulated particles in a block of lightening;
- absence of schemes of automatic regulation of pH environment in the block of preliminary clarification of water;
- lack of stage disinfection of water;
- lack of filters in front of the entrance of water in block reverse osmosis (possible «overshoot» colloidal particles)
The technical result of the proposed group of inventions is increase of term of service of ultrafiltration and reverse osmosis membranes; provision of water disinfection.
The technical result is achieved by the installation for preparation of desalinated water contains a series-connected system of preliminary clarification and block ultrafiltration and reverse osmosis unit, wherein is equipped with a heat exchanger for heating water source connected with the entrance of the block of preliminary clarification, connected in a block ultraviolet disinfection and block filters with filtration level no more than 5 mkm established between the block of ultrafiltration and reverse osmosis unit, which is a unit of the two-stage reverse osmosis.
Also, the yield to concentrate first stage unit for two-stage reverse osmosis connected to the backwashing membranes, United with actuator ultrafiltration that line filing of the leaching water is connected to the input of the block of preliminary clarification.
Also, the yield to concentrate second stage unit for two-stage reverse osmosis is connected between the unit ultrafiltration and block ultraviolet disinfection.
In addition, the block of preliminary clarification includes serially connected aeration tank, a tank of coagulation and Dodge.
Moreover Dodge preferably made in the form of capacity with tapered bottom and separation device in the upper part, has through channels with an inclination to the horizon 40 to 70 degrees.
Figure 1 shows a diagram of the installation for preparation of desalinated water.
Installation for preparation of desalinated water contains consistently connected plate-type heat exchanger 1 for heating water source with regulating valve 2, the block of preliminary clarification, which includes serially connected tank 3 aeration tank 4 coagulation and Dodge 5 with slime pump 6, hereinafter reception tank, 7, 8 pumps, block 9 of ultrafiltration, intermediate tank 10, pumps 11 block ultraviolet disinfection (UV sterilizer 12), block 13 roll filters with filtration level 5 microns (not more), unit 14-stage reverse osmosis, tank 15 for desalinated water pumps and 16.
Output of the first stage unit 14-stage reverse osmosis to concentrate connected with the module backwashing membranes (washing capacity of 18), United with actuator 9 ultrafiltration that line filing of leaching water is connected via a tank 17 to the entrance of the block of preliminary clarification.
Output to concentrate second stage in block 14 of the two-stage reverse osmosis is connected to intermediate tank 10 between the block 9 of ultrafiltration and block 13 roll filters.
Installation works as follows.
Source water, passing the plate-type heat exchanger 1, heated to a temperature of 20-25°C heating water from the packaging machine circuit. Temperature of initial water is maintained constant with the help of automatic control valve 2, installed on the by-pass of the plate heat exchanger line 1 of the district heating water. Keeping a constant temperature in a given interval is a necessary condition for the coagulation process. In the line of source water consistently dosed coagulant solution (for example, aluminium oxychloride mark «Aqua-Aurat 30») and a solution of alkali, such as sodium hydroxide. The number of coagulant selected experimentally, on the basis of laboratory studies. One of the main conditions of the coagulation process is to maintain a specific pH-values. Dosage of sodium hydroxide is necessary to adjust the pH of the water and is in automatic mode for given values of pH in the range of 5,5-7,5.
Then the heated water is mixed with clean water block 9 of ultrafiltration (from the tank 17) and sent to the block of preliminary clarification, which consists of a tank 3 aeration tank 4 coagulation and clarifier 5. Initial water enters the bottom point of the aeration tank 3 (agitator), which served process air of network for the removal of dissolved gases, oxidation of dissolved iron and improve the mixing of reagents with water. In the same tank 3 is the initial coagulation (consolidation particles coagulant and pollution). Then the water flows under gravity in the bottom point of the tank 4 coagulation (agitator), where the degassing of water and the final coagulation. water from the upper point of the tank 4 coagulation two parallel flows by gravity comes from opposite sides in the bottom of the clarifier 5, which is designed for deposition and removal of the resulting sludge (major connections coagulant and pollution in the form of flakes). Water upward flow rises from below upward. At the top of the clarifier 5 established the thin-layer separation unit, consisting of profiled plates, forming a cross section of channels in the form of a honeycomb. The slope of the plates is 40-70 degrees to the horizon. Separation of suspended particles occurs due to changes in the direction of the water flow in the channel of the device. In the middle part of the clarifier 5 formed a weighted layer of coagulated particles in the form of flakes, which is a contact medium, when the water passes through the layer of pollution are deposited. The presence of the fluidized flakes significantly speeds up the deposition process and make it more effective. When the rate of sedimentation in the form of flakes becomes higher than the velocity of water flow, they are deposited in the bottom of the clarifier 5 pyramidal form and with the periodicity of 8-12 hours deleted slime pump 6.
Effective water clarification in the block of preliminary clarification protects the membrane block 9 of the ultrafiltration from early failure.
The clarified water is collected in the receiving chute at the top of the clarifier 5 and gravity is served in the reception tank 7 block 9 of the ultrafiltration. From the receiving tank 7 8 pumps, one business and one reserve) water is served in the apparatus block 9 of ultrafiltration, one business and one reserve), where there is a clearing of suspended solids, colloid and organic impurities. In block 9 of ultrafiltration is also integrated module backwashing membranes with the washing capacity of 18. The clarified water is collected in the intermediate tank 10, where pumps 11, one business and one reserve) is served on the processing in ultra-violet sterilizer 12 for disinfection, then passes the unit 13 roll filters with filtration level 5 microns (one working and one reserve), which retained colloidal particles, «» through the block 9 of ultrafiltration, which can lead to early failure of membranes in block 14 of the reverse osmosis.
Then disinfected, and free from suspended matter, water enters the stage of two-stage osmosis unit 14, membrane units I and II levels which are connected in series by filtrate. Filtrate the first stage is input stage II for purification and concentrate stage I sent a capacity of 18 for leaching block 9 of the ultrafiltration. Concentrate grade II returned to the intermediate tank 10 for re-treatment.
For pH correction and removal of carbonic acid at the entrance of the second stage unit 14 is dosing of sodium hydroxide solution. Membrane units I and II levels assembled on one frame in the form of a monoblock and have a common module of leaching.
After cleaning on the reverse osmosis membranes desalted water is collected in a tank 15, where pumps 16, one business and one reserve) is fed to the production of synthesis-gas.
In the case of routine maintenance or flush on all stages of reverse osmosis remaining in the work of the stage continues to produce water and supplying it synthesis gas production.
Advantages of the proposed invention are:
- the most optimal conditions of the coagulation process, as the temperature and pH of water are held constant at the expense of automatic control;
- large deposition efficiency of colloidal particles thanks to the use of aeration of the water and the separation devices in a block of lightening;
- extended lifetime of ultrafiltration and reverse osmosis membranes;
- presence of stages of water disinfection.
1. Installation for preparation of desalinated water containing consistently United system of preliminary clarification and block ultrafiltration and reverse osmosis unit, wherein is equipped with a heat exchanger for heating water source connected with the entrance of the block of preliminary clarification, connected in a block ultraviolet disinfection block of filters with filtration level no more than 5 mkm established between the block of ultrafiltration and reverse osmosis unit, which is a unit of the two-stage reverse osmosis.
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