CN111320249A - Seawater desalination mineralization steam-water mixing device - Google Patents
Seawater desalination mineralization steam-water mixing device Download PDFInfo
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- CN111320249A CN111320249A CN202010144324.8A CN202010144324A CN111320249A CN 111320249 A CN111320249 A CN 111320249A CN 202010144324 A CN202010144324 A CN 202010144324A CN 111320249 A CN111320249 A CN 111320249A
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F1/68—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
- C02F1/685—Devices for dosing the additives
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/03—Pressure
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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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- Hydrology & Water Resources (AREA)
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- Environmental & Geological Engineering (AREA)
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Abstract
The invention discloses a seawater desalination mineralization steam-water mixing device which comprises a water inlet assembly, a steam-water mixer group, a blind plate clamp, a gas quality controller, an exhaust valve, a water outlet regulating valve and a power distribution cabinet, wherein the water inlet assembly is connected with the water inlet assembly; the gas quality controller is connected between an external gas source and the gas inlet ends of the two groups of steam-water mixer groups in a conduction manner through a gas inlet pipeline; the water outlet ends of the two groups of steam-water mixer groups are provided with water outlet regulating valves; the water inlet assemblies respectively comprise a main water inlet valve, a lifting pump, a pressure gauge and a water inlet regulating valve which are sequentially communicated. The device can fully dissolve carbon dioxide in water under different environments, is particularly suitable for a post-mineralization system of a seawater desalination system taking double-stage reverse osmosis as a main process, and has the characteristics of good treatment effect, stable dissolved carbon dioxide content, high automation degree and the like.
Description
Technical Field
The invention relates to the field of seawater desalination equipment, in particular to a seawater desalination mineralization steam-water mixing device.
Background
In the global water volume, 97% is seawater, the rest 3% of fresh water is mostly frozen in the ice and snow of polar regions and high mountains, and only about 0.007% of fresh water exists in rivers, lakes, reservoirs and shallow strata and can be enjoyed by human beings. Therefore, desalination of sea water is a necessary way for human beings to solve the lack of fresh water.
Since the 50 s of the 20 th century, the development of seawater desalination has been fast, and the technologies for reaching the industrial scale production application at present mainly comprise a distillation method, an electrodialysis method and a reverse osmosis method; the reverse osmosis method has wide adaptability, is suitable for large, medium and small scales and is also suitable for seawater or brackish water, and is the fastest seawater desalination technology developed in 20 years.
The reverse osmosis process uses a semi-permeable membrane that allows only fresh water to pass through but not salts. If the salt water and the fresh water are separated by the semipermeable membrane, the fresh water automatically permeates to the salt water without applying pressure; if a certain pressure is applied to the seawater, the fresh water in the seawater can permeate through the semipermeable membrane to the fresh water side, so the seawater is called reverse osmosis. The reverse osmosis method is a pressure-driven separation technology, has no phase change in the desalination process, is the most advanced and energy-saving and effective desalination technology in the world at present, and is the first choice for large and medium-sized seawater desalination plants in America, Europe and Asia, and has a considerable scale of application in the gulf countries.
The desalted water is usually weakly acidic, and the alkalinity and the hardness are lower, generally less than 10mg/L (as CaCO)3Meter), the phenomenon of "yellow water" often appears in the direct entering at municipal water supply network. To enable the desalinated water to enter the municipal water supply network, it must be subjected to corresponding post-treatment to improve chemical stability.
The ion content of the desalted water is increased by mineralization treatment, namely a certain method, and generally speaking, the hardness and alkalinity of the desalted water are mainly increased. Methods of mineralization fall broadly into three categories: firstly, a direct medicament adding method; secondly, mixing with other water sources; and thirdly, an ore dissolving method.
Dissolving the ore, i.e. blowing a certain amount of carbon dioxide gas into the desalinated water, and leading the acidified fresh water to pass through a mineralization tank or a mineralization pond filled with ore with the main component of calcium carbonate.
CaCO3+CO2+H2O→Ca(HCO3)2(1-1)。
The dissolution mechanism of calcium carbonate is as follows, and the total reaction formula (1-1) is decomposed into three reactions shown in (1-2). In bodies of water where strong acids and carbon dioxide are present simultaneously, the rate of dissolution of calcium carbonate is a function of pH and partial pressure of carbon dioxide.
(1) Under the condition that the pH is less than 4, the dissolution rate is independent of the partial pressure of the carbon dioxide and has a linear relationship with the pH of the water body in a negative correlation manner. The dissolution process of calcium carbonate at this time is shown as the first formula of the formula (1-2). The reaction rate in this region is very fast, H+Can replace calcium ions in calcite in a short time.
(2) In the case of pH > 7, the dissolution rate is independent of pH and is determined by the partial pressure of carbon dioxide. The dissolution process of calcium carbonate at this time is shown in the second formula of the formula (1-2). The reaction rate is in positive correlation with the partial pressure of carbon dioxide, and mass transfer of calcium carbonate from a solid phase to a liquid phase becomes a limiting factor in the dissolution process of the calcium carbonate.
(3) When the pH is in between, the dissolution rate is determined by the pH and the partial pressure of carbon dioxide. The dissolving process of calcium carbonate is shown as the formula (1-2). H+Can be consumed quickly, and the buffer capacity of the water can be used for reducing the consumed H due to the existence of a large amount of carbonic acid+Make-up is formed, and in fact most of the area is still carbon dioxide consumed.
Compared with other methods, the carbon dioxide dissolved calcium carbonate has wider and cheaper sources, and the property of the calcium carbonate is stable so as to be convenient for storage management. Compared with the sulfuric acid dissolved calcium carbonate, the carbon dioxide dissolved calcium carbonate can obtain better chemical stability, and the effluent does not contain other exogenous ions. Therefore, an automatic device capable of efficiently dissolving calcium carbonate is urgently needed at present.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a seawater desalination and mineralization steam-water mixing device, which is used for improving the dissolving effect of carbon dioxide, improving the instability after dissolving and improving the automation degree of equipment.
The invention provides a seawater desalination mineralization steam-water mixing device which comprises a water inlet assembly, a steam-water mixer group, a blind plate hoop, a gas quality controller, an exhaust valve, a water outlet regulating valve and a power distribution cabinet, wherein the water inlet assembly is connected with the water inlet assembly;
the gas quality controller is connected between an external gas source and the gas inlet ends of the two groups of steam-water mixer groups in a conduction manner through a gas inlet pipeline; the water outlet ends of the two groups of steam-water mixer groups are provided with water outlet regulating valves;
the water inlet assembly comprises a main water inlet valve, a lift pump, a pressure gauge and a water inlet adjusting valve which are sequentially communicated, and the power distribution cabinet is respectively in conductive connection with the lift pump, the pressure gauge, the water inlet adjusting valve, the gas quality controller, the exhaust valve and the water outlet adjusting valve.
The invention has the beneficial effects that:
the two groups of water inlet assemblies are provided with lifting pumps, the two lifting pumps are connected in parallel, and the filtering water pressure can be adjusted according to different conditions by adopting a variable frequency design; the two water inlet regulating valves are used for regulating the flow in front of the steam-water mixer group; the gas quality controller is capable of accurately metering the mass of gaseous carbon dioxide discharged from an external gas source. This equipment passes through the air input of switch board control inflow and carbon dioxide, and filtration water pressure is adjusted to the rethread elevator pump, and whole filtration process is accomplished according to the procedure of setting for by the switch board automatically, has improved degree of automation greatly. The equipment is specially used for dissolving carbon dioxide, has good dissolving effect and stable state after dissolution, and is favorable for smooth proceeding of subsequent procedures.
Preferably, the steam-water mixers each comprise a stainless steel shell and a stainless steel filter element arranged inside the stainless steel shell, the material of the stainless steel filter element is 316L, and the filtering precision is 50 μm.
Every vapour water mixer all carries out fixed connection through the blind plate clamp, and the stainless steel filter core uses the external pressure design, and the stainless steel external pressure filter core of filter fineness 50 mu m can make carbon dioxide and water reach intensive mixing when operation water pressure 3 ~ 5Bar, and pressure loss can be controlled at 0.5Bar, can ensure that the water pressure after the mixture gets into next link and still keeps certain pressure.
Preferably, the steam-water mixer further comprises a bracket, and the steam-water mixers are all mounted on the bracket through blind plate hoops.
Preferably, the air inlet line is provided with an exhaust valve.
Preferably, the inside of switch board is equipped with the PLC controller and the outside of switch board is equipped with the touch-sensitive screen.
The touch screen is used for setting working parameters such as water pressure and flow, the PLC is used for controlling the automatic operation of the equipment according to the set parameters, the PLC works stably, the control mode is simple, and the efficiency is high.
Preferably, each steam-water mixer group comprises four steam-water mixers, and the four steam-water mixers form a serial connection and conduction structure through a throttle valve.
Preferably, each steam-water mixer group comprises four steam-water mixers, and the four steam-water mixers form a structure which is communicated in parallel through a throttle valve.
Preferably, each steam-water mixer group comprises four steam-water mixers, and the four steam-water mixers form a mixed connection and conduction structure through a throttle valve.
Preferably, two steam-water mixers in each steam-water mixer group are conducted in parallel and then conducted in series with the other two steam-water mixers conducted in parallel, so as to form the mixed and conducted structure.
The equipment is used for different systems, and correspondingly adopts a structure of serial conduction, parallel conduction or mixed conduction according to parameters of water quantity, environment, pressure, temperature, pH value and the like of different systems so as to maximize the mixing efficiency.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a flowchart illustrating the operation of the present embodiment;
FIG. 2 is a schematic structural diagram of the present embodiment;
FIG. 3 is a top view of FIG. 2;
fig. 4 is a parallel connection and conduction structure of four steam-water mixers of each steam-water mixer group in this embodiment;
fig. 5 is a serial connection structure of four steam-water mixers of each steam-water mixer group in this embodiment;
fig. 6 is a mixing and communicating structure of four steam-water mixers of each steam-water mixer group in this embodiment.
In the attached drawing, a main water inlet valve 1, a lifting pump 2, a pressure gauge 3, a water inlet adjusting valve 4, a vaporizer shell 5, a blind plate hoop 6, a gas quality controller 7, an exhaust valve 8, a water outlet adjusting valve 9, a stainless steel filter element 10, a power distribution cabinet 11, a steam-water mixer 12, a support 13 and an air inlet pipeline 14.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
As shown in fig. 1 to fig. 3, the embodiment provides a seawater desalination and mineralization steam-water mixing device, which includes a water inlet assembly, a steam-water mixer group 12, a blind plate hoop 6, a gas quality controller 7, an exhaust valve 8, a water outlet regulating valve 9 and a power distribution cabinet 11. And the water inlet assemblies and the steam-water mixer groups 12 are respectively provided with two groups, and the two groups of water inlet assemblies are communicated in parallel and then communicated in series with the water inlet ends of the two groups of steam-water mixer groups 12 communicated in parallel.
Wherein the concrete structure of assembly of intaking is as follows:
the water inlet assemblies respectively comprise a main water inlet valve 1, a lifting pump 2, a pressure gauge 3 and a water inlet regulating valve 4 which are sequentially communicated, the two groups of water inlet assemblies are respectively provided with the lifting pumps 2, the two lifting pumps 2 are connected in parallel, and the filtering water pressure can be regulated according to different conditions by adopting a variable frequency design; and the two water inlet regulating valves 4 are used for regulating the flow rate in front of the steam-water mixer group 12. 10-20% of the secondary reverse osmosis produced water of the seawater desalination system is mixed with carbon dioxide gas, and the rest 80-90% of the water is mixed with acidified water filled with carbon dioxide gas through a bypass pipeline. The main water inlet valve 11 is used for controlling the adjustment of the flow of the seawater desalination double-stage reverse osmosis inlet water.
The specific structure of the steam-water mixer group 12 is as follows:
as shown in fig. 4 to 6, each steam-water mixer group 12 includes four steam-water mixers 12, and the four steam-water mixers 12 are connected in series, in parallel, or in a mixed manner through a throttle valve. The specific connection mode of the mixed connection conduction is as follows: two of the steam-water mixers 12 of each steam-water mixer group 12 are conducted in parallel and then conducted in series with the other two steam-water mixers 12 conducted in parallel, thereby forming the mixed and conducted structure. The equipment is used for different systems, and correspondingly adopts a structure of serial conduction, parallel conduction or mixed conduction according to parameters of water quantity, environment, pressure, temperature, pH value and the like of different systems so as to maximize the mixing efficiency. The embodiment also comprises a bracket 13, and the steam-water mixers 12 are all arranged on the bracket 13 through blind plate hoops 6.
The gas quality controller 7 in this embodiment is connected between an external gas source and the gas inlet ends of the two groups of steam-water mixer groups 12 in a conducting manner through a gas inlet pipeline 14, and the water outlet ends of the two groups of steam-water mixer groups 12 are provided with water outlet regulating valves 9. The specific structure of the steam-water mixer 12 is as follows: the steam-water mixers 12 each include a stainless steel housing and a stainless steel filter element 10 installed inside the stainless steel housing, the material of the stainless steel filter element 10 is 316L and the filtering accuracy is 50 μm. Each steam-water mixer 12 is fixedly connected through a blind plate hoop 6, the stainless steel filter element 10 adopts an external pressure design, the stainless steel external pressure filter element with the filtering precision of 50 microns can enable carbon dioxide and water to be fully mixed when the water pressure is 3-5 Bar, the pressure loss can be controlled at 0.5Bar, and the mixed water pressure can be ensured to enter the next link and still keep a certain pressure.
Wherein air inlet pipeline 14 is equipped with two discharge valves 8 and a manometer 3, the inside of switch board 11 is equipped with the PLC controller and the outside of switch board 11 is equipped with the touch-sensitive screen. The power distribution cabinet 11, namely a PLC controller, is respectively in conductive connection with the lifting pump 2, the pressure gauge 3, the water inlet regulating valve 4, the gas quality controller 7, the throttle valve, the exhaust valve 8 and the water outlet regulating valve 9. The touch screen is used for setting working parameters such as water pressure and flow, the PLC is used for controlling the automatic operation of the equipment according to the set parameters, the PLC works stably, the control mode is simple, and the efficiency is high. The equipment can be randomly provided with a plurality of steam-water mixers 12 according to different water amounts, pressures, temperatures and pH values of incoming water, so that carbon dioxide can be fully dissolved in the water under different environments, the equipment is particularly suitable for a post-mineralization system of a seawater desalination system taking double-stage reverse osmosis as a main process, and has the characteristics of good treatment effect, stable dissolved carbon dioxide content, high automation degree and the like.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (9)
1. A sea water desalination mineralization steam-water mixing arrangement which characterized in that: the device comprises a water inlet assembly, a steam-water mixer group, a blind plate hoop, a gas quality controller, an exhaust valve, a water outlet regulating valve and a power distribution cabinet;
the gas quality controller is connected between an external gas source and the gas inlet ends of the two groups of steam-water mixer groups in a conduction manner through a gas inlet pipeline; the water outlet ends of the two groups of steam-water mixer groups are provided with water outlet regulating valves;
the water inlet assembly comprises a main water inlet valve, a lift pump, a pressure gauge and a water inlet adjusting valve which are sequentially communicated, and the power distribution cabinet is respectively in conductive connection with the lift pump, the pressure gauge, the water inlet adjusting valve, the gas quality controller, the exhaust valve and the water outlet adjusting valve.
2. The seawater desalination mineralization steam-water mixing device of claim 1, wherein: the steam-water mixers respectively comprise a stainless steel shell and a stainless steel filter element arranged inside the stainless steel shell, wherein the stainless steel filter element is made of 316L materials, and the filtering precision is 50 mu m.
3. The seawater desalination mineralization steam-water mixing device of claim 1, wherein: the steam-water mixer is mounted on the support through blind plate hoops.
4. The seawater desalination mineralization steam-water mixing device of claim 1, wherein: the air inlet pipeline is provided with an exhaust valve.
5. The seawater desalination mineralization steam-water mixing device of claim 1, wherein: the inside of switch board is equipped with the PLC controller and the outside of switch board is equipped with the touch-sensitive screen.
6. The seawater desalination mineralization steam-water mixing device according to any one of claims 1 to 5, wherein: each group of steam-water mixer group comprises four steam-water mixers which form a structure of serial connection and conduction through a throttle valve.
7. The seawater desalination mineralization steam-water mixing device according to any one of claims 1 to 5, wherein: each group of steam-water mixer group comprises four steam-water mixers which form a structure communicated in parallel through a throttle valve.
8. The seawater desalination mineralization steam-water mixing device according to any one of claims 1 to 5, wherein: each group of steam-water mixer group comprises four steam-water mixers, and the four steam-water mixers form a mixed connection and conduction structure through a throttle valve.
9. The seawater desalination mineralization steam-water mixing device of claim 8, wherein: and two steam-water mixers of each steam-water mixer group are communicated in parallel and then communicated in series with the other two steam-water mixers communicated in parallel, so that the mixed-connected and communicated structure is formed.
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