CN216191328U

CN216191328U - Small-sized carbonic acid solution adding system

Info

Publication number: CN216191328U
Application number: CN202122347201.7U
Authority: CN
Inventors: 林峡
Original assignee: Harvey Shanghai Environmental Technology Co ltd
Current assignee: Harvey Shanghai Environmental Technology Co ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2022-04-05
Anticipated expiration: 2031-09-27

Abstract

The utility model discloses a small-sized carbonic acid solution adding system. The device comprises a reaction tank, a diffuser, a carbon dioxide gas pipeline and a reaction water pipeline; a water mist nozzle and a carbon dioxide gas nozzle are arranged on the top of the reaction tank; a water pump is arranged on the reaction water pipeline; the outlet of the water pump is connected with the water inlet at the top of the reaction tank and the water spray nozzle through a water pipeline; a pressure regulating valve set is arranged on the carbon dioxide gas pipeline; the outlet of the pressure regulating valve group is connected with a carbon dioxide gas inlet and a carbon dioxide gas nozzle on the top of the reaction tank; the outlet at the bottom of the reaction tank is connected with the inlet of the diffuser; a control valve or a flow-limiting orifice plate or an orifice is arranged between the reaction tank and the diffuser; the diffuser can generate certain back pressure and make the supersaturated carbonic acid solution spray to the water to be treated with certain outlet pressure, and the outlet pressure of the diffuser and the water pressure to be treated have the pressure difference of more than 2 bar. The carbonic acid solution feeding system can accurately adjust the water quality, can greatly reduce the generation of bubbles and greatly improve the utilization rate of carbon dioxide gas.

Description

Small-sized carbonic acid solution adding system

Technical Field

The utility model belongs to the technical field of water treatment, and relates to a small-sized carbonic acid solution adding system for adjusting the pH value of water, remineralizing or lime softening and the like. The small-sized carbonic acid solution adding system is suitable for occasions with small water treatment capacity and no need of quickly generating a large amount of carbonic acid solution. Such as fishponds, shrimp ponds, swimming pools, vegetable greenhouses, flower planting, small-scale seawater desalination and the like.

Background

In surface water, reservoir water, wastewater and process water of manufacturing industry, pH is too high, which exceeds pH8.0 and even more than 9, and subsequent chemical treatment and product quality are seriously influenced by the too high and unstable pH of the water body. For example, the pH of the final effluent of the wastewater should be controlled to 6-9; in the process of coagulation and disinfection of a tap water plant, due to overhigh and unstable pH, chemical agents are excessively added, excessive chemical byproducts are generated, and the effluent water does not reach the relevant national standard; in the textile printing and dyeing industry, the pH of printing and dyeing process water is unstable, the color fastness of products is influenced, and the defective rate and the color fading of the products are caused; in natural water bodies such as rivers, lakes and the like, the pH is too high and changes in a waveform due to factors such as oxygen enrichment, algae outbreak and the like of the water bodies; in water bodies such as fish ponds, shrimp ponds, swimming pools and the like, the pH is overhigh due to the addition of bactericides and disinfectants; the vegetable greenhouse and the flower planting need extra carbon dioxide gas to strengthen photosynthesis, and the carbon dioxide content can be increased by using the carbonated water for irrigation, thereby being beneficial to the growth of crops; .., water is not in place and is closely related to life and production of people, and the accurate control of the pH of water is an important part in the water treatment process flow.

The pH, also known as hydrogen ion concentration index, pH, is a measure of the activity of hydrogen ions in a solution, i.e., a measure of the acid-base degree of a solution in the general sense. Neutral aqueous solutions have a pH of 7 for acidic aqueous solutions, pH < 7, with higher pH values indicating greater alkalinity. The pH value is an important physicochemical parameter of water and sewage, and the pH value is one of important indexes for field control of water treatment. Adjusting and controlling the pH may facilitate chemical reactions and produce specific physicochemical changes.

In order to adjust the pH of water, acidifying agents such as sulfuric acid, hydrochloric acid, and the like are mainly used to neutralize the pH of water; the acidulant belongs to strong acid, which has various safety problems such as storage, transportation and corrosion, and importantly, the strong acid is used for neutralizing the pH value, so that the pH value of the strong acid is difficult to be accurately adjusted, and more importantly, the strong acid can destroy alkaline substances in water in the acid-base neutralization reaction process, and the alkaline substances are indispensable in drinking water.

At present, under the guidance of relevant national policies, many petrochemical plants all over the country are equipped with carbon dioxide purification equipment in a large scale, and produce food-grade carbon dioxide gas, so that the price of the carbon dioxide gas is greatly reduced, and the carbon dioxide gas is convenient for users to purchase locally. Due to the fact that cost and gas resources are easy to obtain, the operation cost of the carbonic acid adding system is almost equal to the use cost of the chemical agent, and through case implementation, a user only needs to invest initial equipment cost, so that the method is economical and feasible by utilizing the pH value of the carbonic acid neutralizing water.

Carbonic acid is a weak acid, and when reacting with a basic substance, there is a buffer zone, so that the neutralization reaction with carbonic acid can accurately control or adjust the pH to a set value required by a customer. Moreover, most of carbon dioxide gas comes from petrochemical waste gas, and the carbon dioxide is not released into the atmosphere again by utilizing the process that the pH of the carbonic acid solution and the water are consumed and completely reacted, so that the greenhouse effect can be reduced, and the carbon neutralization is realized.

In the water treatment production process flow of a tap water plant, coagulation and disinfection are indispensable important links, and how to adjust the pH of raw water has important significance in reducing the use of chemical agents and reducing byproducts.

In the seawater desalination process, the permeated water after seawater is subjected to multistage filtration is acidic and corrosive due to the removal of mineral substances, people need to add lime to remineralize the water, then need to add carbonic acid to react with calcium carbonate which is insoluble in water to generate water-soluble calcium bicarbonate, and the water added with the mineral substances can be drunk by people.

In the sewage treatment, because the hardness of the wastewater is higher, people need to add lime to carry out lime softening treatment on hard water, and then need to add carbonic acid to combine with calcium ions in the wastewater to generate calcium bicarbonate, so that the hardness of the wastewater is reduced; the lime softening treatment is to add hydrated lime Ca (OH)2 into water to react with alkaline components in the water to generate indissolvable CaCO3, the hydrated lime is a strong alkaline substance, the pH of the water after the hydrated lime is added can reach more than 10, high pH water needs acid neutralization, the pH can be accurately adjusted to a value desired by a customer by using carbonic acid, meanwhile, the carbonic acid reacts with indissolvable CaCO3 generated in the reaction process of the hydrated lime and the water to generate calcium bicarbonate dissolved in the water, H2CO3+ CaCO3 ═ Ca (HCO3)2 does not cause the problems of pipeline blockage and the like due to the generation of precipitates, and the lime softening treatment is an application by using the carbonic acid.

The prior art also uses carbon dioxide gas to neutralize the ph of water. Carbon dioxide gas can be dissolved in water to produce carbonic acid. Solubility, defined as the amount of a particular substance that can be dissolved in a particular solvent (resulting in a saturated carbonated solution). The solubility (solubility) of carbon dioxide in water at normal temperature and pressure is limited. The carbon dioxide gas requires a long time to react with water to form carbonic acid, a process known as recarbonation. Because the process of dissolving carbon dioxide in water is a very slow chemical reaction process, when carbon dioxide gas molecules enter water, it reacts with water to form carbon dioxide (water soluble), carbonic acid, bicarbonate ions and hydrogen ions, as shown in the following formula:

CO2+H2O->CO2+H2CO3+HCO3(-)+H(+)；

why this is a very slow chemical reaction process, why this process is slow, because it must be done

It takes time to break the double bond between oxygen and carbon (see the following formula).

One way of neutralizing the pH value of water by using carbon dioxide gas is to directly feed the carbon dioxide gas to neutralize the pH value of the water, the feeding system needs a large-scale reaction tank with a stirrer, the carbon dioxide gas generates small bubbles through a diffuser, and the small bubbles of CO2 react with alkaline substances in the water for a long time and a long distance to achieve the purpose of reducing the pH value. However, small bubbles of CO2 escape from water in the whole reaction process, the effective utilization rate of carbon dioxide gas is only between 30 and 60 percent, the low utilization rate of carbon dioxide gas means high use cost, and the pH can only be adjusted to 7, so that certain process requirements cannot be met.

Another way of neutralizing the ph of water using carbon dioxide gas is to mix the water to be treated with carbon dioxide gas through a venturi nozzle or a venturi static reaction tank and then feed the mixed solution into the water to be treated, which can be fed into shallow ponds and long distance pipelines, but also suffers from the problems of escape of small bubbles of CO2, low reaction efficiency and long reaction time.

The above two types of devices using the venturi principle both for feeding carbon dioxide gas and mixing with treated water to adjust pH are collectively referred to as a gas feeding system. The gas adding systems have the defects of easy escape of CO2 small bubbles, low reaction efficiency, low utilization rate of carbon dioxide gas and long reaction time.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provide a small-sized carbonic acid solution adding system which is used for adjusting the pH value, hardness or turbidity of water and can greatly improve the utilization rate of carbon dioxide gas.

The technical concept of the utility model is as follows: feeding gaseous carbon dioxide at a certain pressure and temperature and reaction water at a certain pressure (low-pH effluent or low-hardness effluent or low-turbidity effluent after being treated by a carbonation process) into a reaction tank, mixing the water and the gas in the tank according to a certain proportion, and generating a carbonated solution under the action of pressure in the tank; then a control valve is used for sealing the saturated carbonic acid solution between the reaction tank and the control valve, so that the saturated carbonic acid solution becomes a supersaturated carbonic acid solution; and finally, reversely injecting the supersaturated carbonic acid solution into the water to be treated through the diffuser, so that the carbonic acid solution and alkaline substances in the water are subjected to neutralization reaction, the purpose of adjusting the pH value of the water can be achieved (or the carbonic acid solution reacts with CaCO3 in the water, and the purpose of adjusting the hardness or turbidity of the water can be achieved), meanwhile, the generation of bubbles can be greatly reduced, and the utilization rate of the carbon dioxide gas is greatly improved.

The purpose of the utility model is realized by the following technical scheme:

the utility model relates to a small-sized carbonic acid solution adding system, which comprises a reaction tank, a diffuser, a carbon dioxide gas pipeline and a reaction water pipeline, wherein the reaction tank is connected with the diffuser through a pipeline; a water mist nozzle and a carbon dioxide gas nozzle are arranged on the top of the inner tank of the reaction tank; a water pump is arranged on the reaction water pipeline; the outlet of the water pump is connected with the water inlet and the water mist nozzle on the top of the reaction tank through a water pipeline; a pressure regulating valve set is arranged on the carbon dioxide gas pipeline; the outlet of the pressure regulating valve group is connected with a carbon dioxide gas inlet and a carbon dioxide gas nozzle on the top of the reaction tank; reacting carbon dioxide gas with reaction water in a reaction tank to generate carbonic acid solution; the outlet at the bottom of the reaction tank is connected with the inlet of the diffuser; a control valve or a flow-limiting orifice plate or an orifice (used for maintaining the pressure in the reaction tank) which can accurately control the flow and the pressure is arranged on a carbonic acid solution pipeline between an outlet at the bottom of the reaction tank and an inlet of the diffuser; the diffuser is arranged in the water to be treated; the diffuser is a hollow cylindrical object with one open end and the other closed end; the cylindrical side wall of the diffuser is provided with a passage for releasing carbonic acid solution; the channel for releasing the carbonic acid solution is a small hole or a narrow gap, or a combination of the small hole and the narrow gap; the channel for releasing the carbonic acid solution can generate certain back pressure and enables the supersaturated carbonic acid solution to be sprayed into the water to be treated at certain outlet pressure, so that the pressure difference of more than 2bar is ensured between the outlet pressure of the diffuser and the pressure of the water to be treated;

the diffuser is arranged in the raw water or water pipeline which flows by water and is to be treated, is positioned at the upstream of the water flow, and a passage for releasing carbonic acid solution is arranged on one half side wall of the diffuser; the channels for releasing carbonic acid solution are one or more, or one or more rows; the diffuser is inserted into the raw water or the water pipeline in a direction perpendicular to the water flow direction, one side of the diffuser, which is provided with a passage for releasing the carbonic acid solution, is right opposite to the upstream of the water flow, so that the carbonic acid solution in the diffuser can be ejected out from the passage for releasing the carbonic acid solution in a reverse direction opposite to the water flow, and when the carbonic acid solution is ejected out to be mixed and reacted with the water, a vortex can be generated to further enhance the mixing effect due to the low pressure at the other side;

alternatively, the diffuser is placed in a basin, pond or tank to be treated, where no water flows, and on both side walls or on the entire cylindrical side wall of the diffuser, there are opened a plurality of or a plurality of rows of channels for releasing carbonic acid solution (one or a plurality of circles of small holes and/or narrow slits can be made on the entire cylindrical side wall, so as to realize 360 ° dispensing).

Furthermore, the inlet of the reaction water pipeline is connected with the water outlet of the water to be treated after being treated by adding carbonic acid (namely, the water outlet treated by the carbonic acid adding system and the adding process is used as water for a water pump, namely reaction water), namely: the water outlet at the lower part of the water pipeline or the raw water flowing with water to be treated is connected with the inlet of the water pump through the reaction water pipeline; or the water outlet of the pool, the pond or the sewage tank to be treated, which has no water flow, is connected with the inlet of the water pump through the reaction water pipeline.

Furthermore, the small-sized carbonic acid solution adding system also comprises a liquid carbon dioxide storage tank, an electronic vaporizer or a fin heat exchanger and a gas heater which are connected in sequence; or the small-sized carbonic acid solution adding system also comprises a Dewar flask or a steel cylinder and a gas heater which are connected in sequence; the outlet of the gas heater is connected with the inlet of the carbon dioxide gas pipeline;

the carbon dioxide gas which is gasified and heated to have certain temperature and certain pressure (the temperature is more than 20 ℃ and the pressure is more than 6 bar) and the pressurized reaction water which is pressurized to have certain pressure (the pressure is more than 3bar) by a water pump form a gas-water mixture at the top of the reaction tank; the gas-water mixture gradually forms saturated carbonic acid solution in the reaction tank; saturated carbonic acid solution passes through a control valve or a flow-limiting orifice plate or an orifice hole which is arranged on a carbonic acid solution pipeline between the reaction tank and the diffuser and can accurately control the flow and the pressure to form supersaturated carbonic acid solution; the supersaturated carbonic acid solution is sprayed into the water upstream of the raw water stream or into the water in the water intake basin in a reverse direction through a channel for releasing the carbonic acid solution on the diffuser.

Furthermore, a water quality online detector (such as a pH probe or a water hardness online detector) is arranged at the downstream of the water flow in the raw water or water pipeline or at the water outlet of the pool, the pond or the sewage tank, the water quality online detector is connected with a signal receiver, and the signal receiver is connected with the input end of the PLC; the output end of the PLC is connected with the control valve; the water quality on-line detector transmits signals to the signal receiver in real time, and the signals received by the signal receiver are processed by the PLC and then control the opening size of the control valve so as to control the adding amount of the carbonic acid solution, thereby achieving the pH value or hardness or turbidity which is desired to be controlled by a user.

Further, when the diffuser is arranged in raw water or a water pipeline which is to be treated and has flowing water, the diffuser is a hollow long cylindrical object with one half of the cross section being a polygon and the other half being an arc, and one end of the hollow long cylindrical object is closed, and a plurality of channels for releasing carbonic acid solution are arranged on the side wall of one half of one side of the polygon of the diffuser; the channel for releasing the carbonic acid solution is one or more rows of small holes, one or more rows of narrow gaps, or a combination of one or more rows of small holes and one or more rows of narrow gaps (namely a combination of small holes and narrow gaps); or may be one or more apertures, one or more narrow slits, or a combination of one or more apertures and one or more narrow slits (i.e., a combination of both apertures and narrow slits); the diffuser is inserted into the raw water perpendicularly to the water flow direction, and the side of the diffuser with the small holes and/or the narrow gaps is opposite to the upstream of the water flow, so that the carbonic acid solution in the diffuser can be sprayed out from the small holes and/or the narrow gaps in a reverse direction to the water flow.

When the diffuser is arranged in a pool, a pond or a sewage tank which is to be treated and does not flow water, the diffuser which can realize 360-degree throwing can be designed into a hollow cylinder shape, and can also be designed into a hollow square cylinder shape with a polygonal (such as square, hexagon and the like) section on the premise of ensuring back pressure.

Furthermore, the small holes and/or narrow slits in each row are located on the same vertical line and are uniformly arranged.

Furthermore, a plurality of channels for releasing carbonic acid solution on the same horizontal plane are uniformly arranged with a central included angle less than 180 degrees; two adjacent channels for releasing carbonic acid solution on the same horizontal plane are arranged in an acute central included angle manner so as to ensure that the carbonic acid solution is ejected towards the water flow direction to be mixed with the water to be treated at a certain outlet pressure (more than 3bar) and can generate a vortex reinforced mixing effect.

Further, the small holes are designed for small-diameter pipes below DN25, that is, when the long-distance pipe is a small-diameter pipe below DN25, the channel for releasing carbonic acid solution is one or more rows of small holes, or a combination of one or more rows of small holes and one or more rows of narrow slits; or one or more apertures, or a combination of one or more apertures and one or more narrow slits; the narrow gaps are more suitable for large-diameter pipes larger than DN25, that is, when the long-distance pipe is a large-diameter pipe larger than DN25, the channel for releasing carbonic acid solution is one or more rows of narrow gaps, or a combination of one or more rows of small holes and one or more rows of narrow gaps; or one or more narrow slits, or a combination of one or more apertures and one or more narrow slits.

Further, the volume ratio of the carbon dioxide gas having a temperature of 20 ℃ or more and a pressure of 6bar or more to the reaction water is not less than 1: 40.

further, the channel for releasing carbonic acid solution can generate back pressure of more than 3bar and make supersaturated carbonic acid solution be sprayed into the water to be treated at outlet pressure of more than 3 bar; the diffuser backpressure was greater than 3bar and maintained the pressure of the entire system at greater than 3 bar. The saturated carbonic acid solution can be further converted into the supersaturated carbonic acid solution only by keeping the system pressure to be more than 3bar, otherwise, the utilization rate of the carbon dioxide can be influenced by more than 97 percent. The concentration of the carbonic acid solution is more than 99% before the outlet of the diffuser, when the carbonic acid solution passes through a small hole and a narrow gap, a small amount of carbon dioxide overflows from the solution in the form of bubbles due to pressure drop, and therefore, the utilization rate of the whole carbon dioxide is more than 97%.

The working principle of the small-sized carbonic acid solution adding system is as follows: the high-pressure low-temperature liquid carbon dioxide is stored in a liquid carbon dioxide storage tank, the liquid carbon dioxide comes out from the bottom of the liquid carbon dioxide storage tank and is conveyed to an electronic vaporizer or a fin heat exchanger, and the liquid carbon dioxide is converted into carbon dioxide gas continuously and quantitatively; alternatively, the carbon dioxide gas is stored in a dewar or a cylinder from which the carbon dioxide gas is released; the carbon dioxide gas passes through a gas heater, the temperature of the carbon dioxide gas is kept above 20 ℃, and the pressure of the carbon dioxide gas is adjusted to be above 6bar through a pressure regulating valve bank; carbon dioxide gas having a temperature of 20 ℃ or higher and a pressure of 6bar or higher is fed from the top of the tank into the reaction tank through a gas pipe, and the air in the tank is discharged; meanwhile, the reaction water (low pH effluent or low hardness effluent or low turbidity effluent after the carbonic acid adding process) is pressurized to be more than 3bar through a water pump and then is sent into the reaction tank from the top of the tank in a high-pressure mist form through a water pipeline, and the pressure in the tank is kept to be more than 3 bar; in the reaction tank, carbon dioxide gas is mixed with pressurized reaction water to form a gas-liquid mixture with certain pressure; because the contact area of the water mist and the carbon dioxide gas is large, and the carbon dioxide gas is quickly dissolved in water and reacts to generate carbonic acid solution in a set pressure environment; the carbon dioxide gas is continuously fed in, or water mist with certain pressure continuously enters the tank, the pressure in the tank is raised to a set pressure, and when the pressure in the reaction tank reaches more than 6bar, the carbonic acid solution in the tank is converted into saturated carbonic acid solution; the saturated carbonic acid solution is pumped to a control valve or a flow-limiting orifice plate or an orifice hole which can accurately control the flow and the pressure through a pipeline at the bottom of the reaction tank, the saturated carbonic acid solution is sealed between the reaction tank and the control valve by the control valve or the flow-limiting orifice plate or the orifice hole, and the saturated carbonic acid solution becomes supersaturated carbonic acid solution due to the continuous pressure in the reaction tank and the dissolution of carbon dioxide gas; the supersaturated carbonic acid solution is conveyed to a diffuser through a pipeline through a valve core or a flow-limiting orifice plate or a throttling hole in an opened control valve; the supersaturated carbonic acid solution forms a mixed solution of a high-concentration carbonic acid solution and a small amount of carbon dioxide microbubbles through a channel (namely a small hole and/or a narrow gap) designed on the diffuser for releasing the carbonic acid solution, and the mixed solution is reversely sprayed into water, the carbonic acid solution meets alkaline substances in the water and starts to perform acid-base neutralization reaction, or the carbonic acid solution meets calcium ions or CaCO3 in the water and reacts, and the small amount of carbon dioxide microbubbles are absorbed by the water flow, so that the purposes of neutralizing acid and base, reducing the hardness of the water or reducing the turbidity of the water are achieved. The water quality on-line detector (pH probe or water hardness on-line detector) is arranged at the downstream of the raw water or water flow in the water pipeline or the water outlet of the water pool, the pond or the sewage tank, and transmits signals to the signal receiver on the control valve in real time, and the signals received by the signal receiver are processed by the PLC and then control the opening size of the control valve so as to control the adding amount of the carbonic acid solution, thereby achieving the pH value or hardness or turbidity which is desired to be controlled by a user.

A liquid level meter for outputting signals is arranged outside the tank body of the reaction tank, and the liquid level signals of the carbonic acid solution in the tank are switched on and off by controlling a water pump and injecting carbon dioxide gas through a PLC processor. When the liquid level drops, the PLC processor controls the water pump and the switch for injecting the carbon dioxide gas to be opened, so that the carbonic acid solution is generated, and the amount of the carbonic acid solution which is added into the water and consumed by neutralization is supplemented.

The carbon dioxide gas is gasified and heated to the temperature of more than 20 ℃ and the pressure of more than 6bar, the water is pressurized to the pressure of more than 3bar by a water pump, and the carbon dioxide gas and the water are mixed in a reaction tank and generate carbonic acid solution under the pressure condition. The saturated carbonic acid solution can be further converted into the supersaturated carbonic acid solution only by keeping the system pressure to be more than 3bar, otherwise, the utilization rate of the carbon dioxide can be influenced by more than 97 percent. The concentration of the carbonic acid solution is more than 99% before the outlet of the diffuser, when the carbonic acid solution passes through a small hole and a narrow gap, a small amount of carbon dioxide overflows from the solution in the form of bubbles due to pressure drop, and therefore, the utilization rate of the whole carbon dioxide is more than 97%.

The solubility of carbon dioxide gas is temperature, pressure dependent: under the same pressure condition, the lower the temperature is, the higher the solubility is; under the same temperature condition, the higher the pressure is, the higher the solubility is; therefore, the generation of carbonic acid can be enhanced or accelerated by lowering the water temperature and increasing the pressure in the tank. The parameters of the water pump and the amount of carbon dioxide gas can be selected according to the conditions of each usage scenario, such as water temperature, water pressure, water quality parameters of raw water (water to be treated), stable pH value or hardness or turbidity desired by a user, and the position of a carbonation dispensing point.

By using an electronic vaporizer or a finned heat exchanger, cryogenic liquid carbon dioxide can be vaporized to gaseous carbon dioxide using electrical heating or air heat exchange principles. The carbon dioxide in the liquid carbon dioxide storage tank is below 0 ℃ and the pressure is about 17-22bar, the temperature of the gaseous carbon dioxide passing through the electronic vaporizer or the fin heat exchanger is 0-10 ℃, the pressure can be adjusted to 5-10bar, the gaseous carbon dioxide is filled into the reaction tank through the gas heater and the gas pipeline to meet the water mist of the reaction water, and the carbon dioxide enters the reaction tank in the pressure reduction process, so that the carbon dioxide can generate dry ice in the pressure reduction process to influence the dissolution and equipment efficiency of the carbon dioxide, therefore, a gas heater needs to be additionally arranged behind the electronic vaporizer or the fin heat exchanger, the temperature of the carbon dioxide is increased to be above 20 ℃ through the gas heater, and the dry ice is prevented from being generated when the carbon dioxide is filled.

The method of lowering the water temperature and raising the pressure in the tank can enhance or accelerate the generation of carbonic acid, for example, the water cooling system … added in the system can be provided with a cooling liquid coil in the reaction tank, or a supplementary cooling water pipe is provided at the middle lower part of the reaction tank.

The liquid carbon dioxide is gasified and warmed to prevent the generation of dry ice. In a high-temperature environment, the generation of dry ice can be prevented without these heating devices. The method of mixing gas and water by using the venturi is not limited to the venturi form in the text.

Control valves capable of controlling flow and pressure, other forms of similar control methods readily contemplated using this principle, such as restriction orifices, and the like.

The water is mixed with the carbon dioxide gas in a mist form in order to increase the contact area and accelerate the mixing to generate the carbonic acid solution, and the size of the low-pH water mist and the mist mixture, such as a nanometer grade, is reduced by utilizing the principle. Therefore, the water mist nozzle at the top of the reaction tank can adopt an industrial acoustic nano-scale atomizer.

The utility model has the beneficial effects that:

the utility model provides a whole set of small-sized carbonic acid solution adding system, wherein gaseous carbon dioxide and reaction water are fed into a reaction tank to be prepared into supersaturated carbonic acid solution in advance, and then the supersaturated carbonic acid solution is added into water through a diffuser, so that the pH value, the hardness or the turbidity of the water is adjusted.

Compared with the prior art, the small-sized carbonic acid solution adding system has the following advantages:

1) in the utility model, gaseous carbon dioxide with certain pressure and temperature and reaction water with certain pressure are fed into a reaction tank and are premixed into a gas-liquid mixture at the top of the tank according to a certain proportion, and then the pressure in the tank is utilized to generate a carbonic acid solution; then a control valve is used for sealing the saturated carbonic acid solution between the reaction tank and the control valve, so that the saturated carbonic acid solution becomes a supersaturated carbonic acid solution; and finally, reversely injecting the supersaturated carbonic acid solution into the water to be treated through the diffuser, so that the carbonic acid solution and alkaline substances in the water are subjected to neutralization reaction, the purpose of adjusting the pH or hardness or turbidity of the water can be achieved, the pH or hardness or turbidity of the water can be accurately adjusted, the generation of bubbles can be greatly reduced, and the utilization rate of carbon dioxide gas can be greatly improved.

2) The supersaturated carbonic acid solution is fed into the water through a diffuser, which is designed to stabilize the system pressure, maintain the system back pressure and inject the carbonic acid solution into the water being treated, in order to avoid large amounts of carbon dioxide bubbles in the mixed liquor escaping in pressure drop due to the low pressure of the water. The supersaturated carbonic acid solution is sprayed out through the small holes of the diffuser and is subjected to acid-base neutralization reaction with alkaline substances in water instantly. Because of the pressure drop, a small amount of carbon dioxide bubbles escape from the carbonic acid solution, so the small amount of carbon dioxide bubbles and the high-concentration carbonic acid solution are ejected together to generate strong vortex with water, the reaction speed is accelerated, and the reaction time is shortened. Application test cases prove that the gas-water mixture or the mixed solution is converted into a supersaturated carbonic acid solution (the concentration of carbonic acid reaches more than 99 percent, and the effective utilization rate of carbon dioxide gas reaches more than 97 percent), the reaction of the carbonic acid solution and water is a liquid-liquid reaction, the neutralization reaction is completed within 20-30 seconds, the minimum pH can reach 5, and the pH fluctuation can be accurately and stably controlled. Compared with a carbon dioxide gas adding mode, the method has the advantages that an additional reaction tank is not needed, the utilization rate of the carbon dioxide gas is high, and the use cost of a user is greatly reduced.

3) In the prior art, a carbon dioxide gas adding mode is used, a Venturi nozzle or a Venturi static reaction tank is a component for projecting gas into water, and the gas and the water are mixed at a contraction section or a throat of the Venturi nozzle and then are ejected through an expansion section. The injection speed of the solution is increased, the pressure is rapidly reduced, a large amount of carbon dioxide gas is precipitated from the solution to form large bubbles, and only a small amount of carbon dioxide gas reacts with water to generate carbonic acid. Due to different pressures at different heights in the water, carbon dioxide bubbles escape from the water in open environments such as shallow pools, water pools and the like; carbon dioxide bubbles can collapse in the tubing, causing vibration and cavitation, and affecting the accuracy of the pH.

The diffuser has the main functions of stabilizing the pressure of the whole system to be more than 3bar by utilizing the small holes and/or the narrow gaps, always sealing carbon dioxide gas in supersaturated carbonic acid solution, and generating stable carbonic acid solution and a small amount of carbon dioxide bubbles when the pressure is released. A passage for releasing carbonic acid solution is arranged on one half side wall of the diffuser, and the passage for releasing the carbonic acid solution is one or more rows of small holes, one or more rows of narrow gaps, or the combination of the small holes and/or the narrow gaps; a plurality of channels for releasing carbonic acid solution on the same horizontal plane are uniformly arranged at a central included angle of less than 180 degrees; two adjacent channels for releasing the carbonic acid solution on the same horizontal plane are arranged in an acute central included angle to ensure that the outlet pressure of the carbonic acid solution is more than 3bar to jet out and mix with the water to be treated. The inlet pressure and outlet pressure (ideal) of the pressurized mixture are made to coincide through the small holes and/or narrow slits and are injected into the water at a very rapid rate. The pressure drop causes partial carbon dioxide gas to escape from the solution in the form of micro-bubbles, so that the mixed solution of carbonic acid solution and micro-bubbles is sprayed together to mix with water, meanwhile, because the small holes and/or narrow slits in each row are positioned on the same vertical line and are uniformly arranged, the pressure difference between the side with holes and the side without holes of the diffuser, the pressure mixed solution forms vortex in the water, and the acid-base neutralization reaction is further accelerated.

In the utility model, the diffuser used for spraying the carbonic acid solution, the narrow gap and the small hole are used in combination or independently, and the small hole or the combination of the narrow gap and the small hole is designed for a small-diameter pipeline below DN 25; the narrow gap or the combination of the narrow gap and the small hole is more suitable for a large-caliber pipeline which is larger than DN 25; the solution ejected through the narrow gap has a larger contact surface with water than if only small holes were used; depending on the use scenario, a combination of small holes and/or narrow slits may also be used. The liquid flows through the small holes and is a contraction and re-diffusion process, the liquid state is turbulent flow, great pressure loss is generated, and more carbon dioxide gas is separated out due to too many small holes. The state when the liquid passes through a narrow gap and the pressure is below 10bar is laminar, in contrast to small pores, where the evolution of carbon dioxide is much less than small pores. However, in some cases, a combination of small holes and narrow gaps is required, so that a small amount of carbon dioxide gas is lost, a certain turbulent flow is formed, and the mixing effect with raw water is enhanced.

Compared with a Venturi nozzle or a Venturi static reaction tank in the prior art, the carbonic acid solution diffuser solves the problems of low utilization rate (dissolution rate) of carbon dioxide gas, noise, vibration, cavitation and the like; meanwhile, the application scene range of the carbonic acid solution adding is wider, and the method can be applied to natural lakes, shallow channels, shallow pools, pipelines, liquid storage tanks and the like.

4) The utility model solves the problem that carbon dioxide gas is easy to separate out from liquid when gas and water with different pressures are mixed; the conversion of the gas-water mixture into a supersaturated carbonic acid solution requires pressure and time, and the design of the reaction tank solves these problems, and the carbonic acid solution is kept stable in a closed pressure environment.

Drawings

FIG. 1 is a schematic view showing the overall construction of a small-sized carbonic acid solution adding system of the present invention (a diffuser 6 is provided in a water pipe through which water to be treated flows);

FIG. 2 is a schematic diagram showing the overall construction of a small carbonated solution dosing system of the present invention (diffuser 6 is placed in the basin to be treated, where no water flows);

FIG. 3 is a sectional top view of the diffuser 6 of the present invention;

FIG. 4 is a front view of the diffuser 6 according to the present invention;

fig. 5 is a side view of the diffuser 6 according to the present invention.

In the figure: 1. liquid carbon dioxide storage tank 2, electronic vaporizer 3, gas heater 4, water pump 5, reaction tank 6, diffuser 7, pH probe 8, narrow gap 9, aperture 10, pressure regulating valve group 11, reaction water pipeline 12, carbon dioxide gas pipeline 13, carbon dioxide gas injection switch 14, control valve 15, carbonic acid solution pipeline A, central included angle B, central included angle

Detailed Description

The utility model is further described below with reference to the following figures and examples.

Example 1

As shown in fig. 1, the small-sized carbonic acid solution adding system for adjusting pH of water in the embodiment comprises a liquid carbon dioxide storage tank 1, an electronic vaporizer 2, a gas heater 3, a reaction tank 5 and a diffuser 6 which are connected in sequence, and further comprises a water pump 4, a reaction water pipeline 11 and a carbon dioxide gas pipeline 12; a water spray nozzle (connected with a reaction water pipeline 11) and a carbon dioxide gas nozzle (connected with a carbon dioxide gas pipeline 12) are arranged on the top of the inner tank of the reaction tank 5; the water pump 4 is arranged on the reaction water pipeline 11; an outlet of the water pump 4 is connected with a water inlet and a water mist nozzle on the top of the reaction tank 5 through a reaction water pipeline 11; the outlet of the gas heater 3 is connected with a carbon dioxide gas inlet and a carbon dioxide gas nozzle on the top of the reaction tank 5 through a carbon dioxide gas pipeline 12; a pressure regulating valve group 10 is arranged on the carbon dioxide gas pipeline 12; the outlet of the pressure regulating valve group 10 is connected with a carbon dioxide gas inlet and a carbon dioxide gas nozzle on the top of the reaction tank 5 through a carbon dioxide gas pipeline 12; the carbon dioxide gas and the reaction water react in the reaction tank 5 to generate carbonic acid solution; the reaction water pipeline 11 and the carbon dioxide gas pipeline 12 are respectively provided with a small section which extends into the reaction tank 5; the outlet at the bottom of the reaction tank 5 is connected with the inlet of the diffuser 6; a control valve 14 capable of accurately controlling the flow and the pressure is arranged on a carbonic acid solution pipeline between the outlet at the bottom of the reaction tank 5 and the inlet of the diffuser 6. The diffuser 6 is arranged in the water pipe through which water flows to be treated, is positioned upstream of the water flow, and is inserted into the water pipe perpendicularly to the water flow direction; a plurality of channels for releasing carbonic acid solution are formed on the half side wall of the diffuser 6, the channels for releasing carbonic acid solution can generate back pressure of more than 3bar and enable supersaturated carbonic acid solution to be sprayed into water to be treated (reversely sprayed into the water at the upstream of the water flow) at the outlet pressure of more than 3bar, and the pressure difference between the outlet pressure of the diffuser and the pressure of the water to be treated is ensured to be more than 2 bar; the downstream water outlet of the water pipeline through which water flows to be treated is connected with the inlet of the water pump 4 through a reaction water pipeline 11 (the low-pH outlet water treated by the carbonic acid adding system and the adding process is used as the water used by the water pump 4, namely reaction water); a pH probe 7 is arranged at the downstream of water flow in the water pipeline, the pH probe 7 is connected with a signal receiver, and the signal receiver is connected with the input end of the PLC; the output end of the PLC is connected with the control valve 14; the pH probe 7 transmits a signal to the signal receiver in real time, and the signal received by the signal receiver is processed by the PLC and then controls the opening size of the control valve 14 so as to control the adding amount of the carbonic acid solution, thereby achieving the pH value which a user wants to control.

As shown in fig. 3-5, the diffuser 6 is a hollow long cylindrical object with one half of a polygon and the other half of a circular arc in cross section and one closed end, and a plurality of channels for releasing carbonic acid solution are formed on one half of the side wall of the polygon of the diffuser 6; the channel for releasing the carbonic acid solution is a combination of a small hole and a narrow gap, the middle of the channel is provided with a row of small holes 9, and the two sides of the channel are respectively provided with a row of narrow gaps 8; two adjacent channels (small holes 9 and/or narrow slits 8) for releasing carbonic acid solution on the same horizontal plane are arranged at an acute central included angle (that is, the central included angle formed by the connecting line of the two adjacent channels for releasing carbonic acid solution and the central point is an acute angle, for example, two central included angles A, B in fig. 2 are acute angles), so as to ensure that the carbonic acid solution is ejected against the water flow direction at an outlet pressure of more than 3bar to be mixed with the water to be treated, and a vortex reinforced mixing effect can be generated.

As shown in fig. 1, 5, a diffuser 6 is provided in the water pipe through which water flows to be treated, upstream of the water flow; the diffuser 6 is inserted into the water pipeline in a direction perpendicular to the water flow, one side of the diffuser 6 with the small holes 9 and the narrow gaps 8 is opposite to the upstream of the water flow, so that the carbonic acid solution in the diffuser 6 can be ejected out from the small holes 9 and the narrow gaps 8 in a reverse direction opposite to the water flow, and the carbonic acid solution is ejected out to react with the water in a mixing way, and simultaneously, the vortex can be generated to further enhance the mixing effect due to the low pressure of the other side.

The small holes 9 and narrow slits 8 in the diffuser 6 enable a back pressure of above 3bar to be generated and the supersaturated carbonic acid solution to be injected into the water to be treated in the water conduit at an outlet pressure of greater than 3bar (back-injected into the water upstream of the water flow), ensuring a pressure differential of above 2bar between the outlet pressure of the diffuser 6 and the pressure of the water to be treated.

The working principle of the small-sized carbonic acid solution adding system of the embodiment is as follows: the high-pressure low-temperature liquid carbon dioxide is stored in a liquid carbon dioxide storage tank 1; the liquid carbon dioxide comes out from the bottom of the liquid carbon dioxide storage tank 1 and is conveyed to the electronic vaporizer 2, and the liquid carbon dioxide is converted into carbon dioxide gas continuously and quantitatively; the carbon dioxide gas passes through a gas heater 3, the temperature of the carbon dioxide gas is kept above 20 ℃, and the pressure of the carbon dioxide gas is adjusted to be above 6bar through a pressure regulating valve group 10; carbon dioxide gas having a temperature of 20 ℃ or higher and a pressure of 6bar or higher is fed into the reaction tank 5 from the tank top (ejected from the carbon dioxide gas nozzle) through the gas pipe 12, and the air in the tank is discharged; meanwhile, low-pH water (low-pH effluent water treated by a carbonation process) is pressurized to more than 3bar through a water pump 4 and then is sent into a reaction tank 5 in a high-pressure fog form from the tank top (entering from a water inlet of the tank top and sprayed out from a water fog nozzle of the tank top) through a water pipeline 11, and the pressure in the tank is kept to be more than 3 bar; in the reaction tank 5, the carbon dioxide gas is mixed with the pressurized reaction water mist to form a gas-liquid mixture with a certain pressure; because the contact area of the water mist and the carbon dioxide gas is large, and the carbon dioxide gas is quickly dissolved in water and reacts to generate carbonic acid solution in a set pressure environment; with the continuous feeding of carbon dioxide gas, when the pressure in the reaction tank reaches more than 6bar, the carbonic acid solution in the tank is converted into saturated carbonic acid solution; the saturated carbonic acid solution is pumped to a control valve 14 capable of accurately controlling flow and pressure through a pipeline at the bottom of the reaction tank 5, the control valve 14 seals the saturated carbonic acid solution between the reaction tank 5 and the control valve 14, and the saturated carbonic acid solution becomes supersaturated carbonic acid solution due to the continuous pressure in the reaction tank 5; the control valve 14 is opened, the supersaturated carbonic acid solution passes through a valve core in the control valve 14, the supersaturated carbonic acid solution is conveyed to the diffuser 6 through a pipeline, a mixed solution of a high-concentration carbonic acid solution and a small amount of carbon dioxide microbubbles is formed through a channel which is designed on the diffuser 6 and used for releasing the carbonic acid solution, namely the small holes 9 and the narrow slits 8, and is reversely sprayed into water, the carbonic acid solution meets alkaline substances in the water and starts to carry out acid-base neutralization reaction, and the small amount of carbon dioxide microbubbles are absorbed by water flow so as to achieve the purpose of neutralizing acid-base. The pH probe 7 is arranged at the downstream of the water flow in the water pipeline and transmits a pH signal to the signal receiver on the control valve 14 in real time, and the signal received by the signal receiver is processed by the PLC and then controls the opening size of the control valve 14 so as to control the adding amount of the carbonic acid solution, thereby achieving the pH value which a user wants to control.

A liquid level meter (not marked in the figure) for outputting signals is arranged outside the tank body of the reaction tank 5, and the liquid level signals of the carbonic acid solution in the tank control the water pump 4 and the switch 13 for injecting the carbon dioxide gas through the PLC processor. When the liquid level drops, the PLC processor controls the water pump 4 and the switch 13 for injecting the carbon dioxide gas to be opened, so that the carbonic acid solution is generated, and the amount of the carbonic acid solution which is put into the water and is consumed by neutralization is supplemented.

The pH values of raw water and water to be treated are unstable and fluctuate between 8 and 12, after the carbonic acid adding process is adopted for adding carbonic acid for treatment, the pH can be reduced and stabilized at the low pH required by a client, and the low pH effluent which is treated by the carbonic acid adding process and stabilized at the low pH required by the client is used as water for a water pump. Such as: the pH of raw water of a tap water plant fluctuates between 8 and 9, the pH required by a client is 7, and the low-pH effluent which is treated by the carbonic acid adding process and is stabilized at the pH of 7 is used as water (reaction water) for a water pump 4. The pH value of the printing and dyeing wastewater fluctuates between 9 and 12, the pH value required by a client is 8.5, the pH value of the effluent treated by the carbonic acid adding process can be stabilized at 8.5, and the effluent with low pH value stabilized at 8.5 and treated by the carbonic acid adding process is used as water (reaction water) for a water pump 4. The pH value of the water to be treated is unstable, the pH value is stable after the water to be treated is treated by adding carbonic acid, and the water with the stable pH value contains carbon dioxide after the water to be treated is added by the carbonic acid, so that the adding amount of the carbon dioxide in the treatment process of the next batch of water to be treated can be reduced if the carbon dioxide is contained in the water. The method is a process of recycling carbon dioxide, ensures the pH of effluent to be stable, and uses as little carbon dioxide gas as possible.

The carbon dioxide gas with certain pressure and heating is mixed with the pressurized reaction water to form a gas-liquid mixture with certain pressure, and the gas-water mixture is converted into a saturated carbonic acid solution in the reaction tank 5; the saturated carbonic acid solution is sealed between the reaction tank 5 and the control valve 14 to form a supersaturated carbonic acid solution; the supersaturated carbonic acid solution is put into water through a diffuser 6 (shown in fig. 2-4) (the supersaturated carbonic acid solution is more capable of reducing the generation of bubbles than the saturated carbonic acid solution); since the water pressure is at a low pressure, in order to avoid substantial escape of carbon dioxide bubbles in the mixed liquor during the pressure drop, the present invention designs this diffuser 6 (shown in fig. 2-4), the function of this diffuser 6 being to stabilize the system pressure, maintain the system back pressure and inject the carbonated solution into the water being treated. The supersaturated carbonic acid solution is sprayed through the small holes 9 and the narrow slits 8 on the diffuser 6, and is subjected to acid-base neutralization reaction with the alkaline substance in the water instantly. Because of the pressure drop, a small amount of carbon dioxide bubbles escape from the carbonic acid solution, so the small amount of carbon dioxide bubbles and the carbonic acid solution are ejected together to generate strong vortex with water, the reaction speed is accelerated, and the reaction time is shortened. Application test cases prove that the gas-water mixture or the mixed solution is converted into a supersaturated carbonic acid solution (the concentration of carbonic acid reaches more than 99 percent, and the effective utilization rate of carbon dioxide gas reaches more than 97 percent), the acid-base neutralization reaction of the carbonic acid solution and alkaline substances in water is liquid-liquid reaction, the neutralization reaction is completed within 20-30 seconds, the minimum pH can reach 5, and the pH fluctuation can be accurately and stably controlled. Compared with a carbon dioxide gas adding mode, the method has the advantages that an additional reaction tank is not needed, the utilization rate of the carbon dioxide gas is high, and the use cost of a user is greatly reduced.

The diffuser 6 is a hollow polygonal long cylindrical body with one closed end, and is inserted perpendicular to the water flow direction, the side of the diffuser 6 with the small holes 9 and the narrow slits 8 faces the upstream of the water flow (see fig. 5), the top end of the diffuser 6 is open (the non-closed end) and can allow the supersaturated carbonic acid solution to enter, and the supersaturated carbonic acid solution is sprayed out from the small holes 9 and the narrow slits 8 in the opposite direction to the water flow and then mixed with the water. The process of the solution entering the water is a depressurization process, in the process of pressure balance, the carbonic acid pressure solution and a small amount of carbon dioxide bubbles form vortex with the upstream of the water flow and the downstream of the water flow at the moment of spraying through the small holes 9 and the narrow gaps 8, the small bubbles are absorbed by the water flow, the carbonic acid solution reacts with the water, and the whole process is a process of intensified mixing and rapid neutralization reaction.

The function of the diffuser 6: in addition to injecting the carbonic acid solution into the water, at the same time, the pressure of the whole system is maintained, preventing carbon dioxide gas from escaping from the carbonic acid solution. The small holes 9 and the narrow gaps 8 on the diffuser 6 keep the system back pressure more than 3bar, the supersaturated carbonic acid solution is reversely sprayed into the water to be treated through the small holes 9 and the narrow gaps 8 on the diffuser 6, and the carbonic acid solution can quickly react with alkaline substances in the water while carbon dioxide bubbles are absorbed by water vortex, so that the purpose of neutralizing the pH value is achieved. This system back pressure will maintain the overall conversion process and line pressure, preventing carbon dioxide bubbles from escaping from the carbonated solution due to pressure drop, and preventing the carbonated solution from returning to the gas-water mixture.

In conclusion, the utility model provides a set of complete small-sized carbonic acid solution feeding system, wherein gas carbon dioxide and low-pH water are acted by pressure in a tank to generate supersaturated carbonic acid solution, and the supersaturated carbonic acid solution is fed into the water through a diffuser so as to adjust the pH value of the water.

In the prior art, a carbon dioxide gas feeding mode is used, a venturi nozzle is a component for projecting gas into water, and the gas and the water are mixed at a contraction section or a throat of the venturi nozzle and then are ejected through an expansion section. The injection speed of the solution is increased, the pressure is rapidly reduced, a large amount of carbon dioxide gas is precipitated from the solution to form large bubbles, and only a small amount of carbon dioxide gas reacts with water to generate carbonic acid. Due to different pressures at different heights in the water, carbon dioxide bubbles escape from the water in open environments such as shallow pools, water pools and the like; carbon dioxide bubbles can collapse in the tubing, causing vibration and cavitation, and affecting the accuracy of pH control.

The main function of the diffuser 6 in the present invention is to stabilize the pressure of the whole system above 3bar by means of the small holes 9 and narrow slits 8 shown in fig. 3-5, to always seal the carbon dioxide gas in the supersaturated carbonic acid solution and to generate a stable carbonic acid solution and a small amount of carbon dioxide bubbles when the pressure is released. As shown in fig. 3-5, a passage for releasing carbonic acid solution is formed on one half of the side wall of the diffuser 6, and the passage for releasing carbonic acid solution is a combination of a row of small holes 9 and a plurality of rows of narrow slits 8 (a combination of small holes and narrow slits); a plurality of channels for releasing carbonic acid solution on the same horizontal plane are uniformly arranged at a central included angle of less than 180 degrees; two adjacent channels for releasing the carbonic acid solution on the same horizontal plane are arranged in an acute central included angle to ensure that the outlet pressure of the carbonic acid solution is more than 3bar to jet out and mix with the water to be treated. Through the small hole 9 and the narrow slit 8, the pressure-mixed liquid (mixed liquid of carbonic acid solution and microbubbles having a certain pressure) has an inlet pressure and an outlet pressure (ideal state) that are the same, and is injected into the water at a very fast speed. Because the pressure drops, the pressure difference can cause part of the carbon dioxide gas to escape from the solution in the form of micro bubbles, the mixed solution of the carbonic acid solution and the micro bubbles is sprayed together to be mixed with the water, meanwhile, because the small holes 9 or the narrow slits 8 on each row are positioned on the same vertical line and are uniformly arranged, the pressure difference exists between the side with holes and the side without holes of the diffuser 6, the pressure mixed solution forms vortex in the water, and the acid-base neutralization reaction is further accelerated.

Compared with a Venturi nozzle in the prior art, the carbonic acid solution diffuser solves the problems of low utilization rate (dissolution rate) of carbon dioxide gas, noise, vibration, cavitation and the like; meanwhile, the application scene range of the carbonic acid solution adding is wider, and the method can be applied to natural lakes, shallow channels, shallow pools, pipelines, liquid storage tanks and the like.

Example 2

As shown in fig. 2, the method for adding carbonic acid by using the small-sized carbonic acid solution adding system in the embodiment is basically the same as the method for adding carbonic acid by using the small-sized carbonic acid solution adding system in the embodiment 1; the difference lies in that: the diffuser 6 is arranged in a water pool to be treated without flowing water, and a plurality of channels for releasing carbonic acid solution are formed on the side walls of two sides of the diffuser 6; the passage for releasing carbonic acid solution is a combination of small hole and narrow gap.

As shown in fig. 2, the diffuser 6 is arranged in a pool to be treated, which has no water flow, and a plurality of circles of small holes and narrow gaps (a row of small holes 9 and a row of narrow gaps 8 are staggered) are formed on the whole cylindrical side wall of the diffuser 6, so that 360-degree throwing is realized.

The channels (small holes 9 and narrow slits 8) for releasing the carbonic acid solution can generate a back pressure of more than 3bar and enable the supersaturated carbonic acid solution to be sprayed into the water to be treated in the water tank at an outlet pressure of more than 3bar, and a pressure difference of more than 2bar is ensured between the outlet pressure of the diffuser and the pressure of the water to be treated.

The water outlet of the pool to be treated, which has no water flow, is connected with the inlet of the water pump 4 through a reaction water pipeline 11 (the low-pH outlet water treated by the carbonic acid adding system and the adding process of the utility model is used as the water used by the water pump 4, namely the reaction water).

The working principle of the small-sized carbonic acid solution adding system of the embodiment is as follows: the carbon dioxide gas gasified and heated to have the temperature of more than 20 ℃ and the pressure of more than 6bar and the pressurized reaction water pressurized to the pressure of more than 3bar by the water pump 4 form a gas-water mixture at the top of the reaction tank 5; the gas-water mixture gradually forms saturated carbonic acid solution in the reaction tank 5; the saturated carbonic acid solution passes through a control valve 14 which is arranged on a carbonic acid solution pipeline 15 between the reaction tank 5 and the diffuser 6 and can accurately control the flow and the pressure to form a supersaturated carbonic acid solution; the supersaturated carbonic acid solution is sprayed into the water in the water pool through the passages (small holes 9 and narrow slits 8) on the diffuser 6 for releasing the carbonic acid solution; a pH probe 7 is arranged at a water outlet of the water pool, the pH probe 7 is connected with a signal receiver, and the signal receiver is connected with the input end of the PLC; the output end of the PLC is connected with the control valve 14; the pH probe transmits a signal to the signal receiver in real time, and the signal received by the signal receiver is processed by the PLC and then controls the opening size of the control valve 14 so as to control the adding amount of the carbonic acid solution, thereby achieving the pH value which a user wants to control.

Example 3

The small-sized carbonic acid solution adding system in the embodiment is basically the same as the small-sized carbonic acid solution adding system in the embodiment 1; the difference lies in that: the carbonic acid solution pipeline 15 is a large-diameter pipeline larger than DN25, the channel for releasing the carbonic acid solution is a narrow gap, the middle of the channel is provided with a row of narrow gaps 8, and two sides of the channel are respectively provided with a row of narrow gaps 8.

Example 4

The small-sized carbonic acid solution adding system in the embodiment is basically the same as the small-sized carbonic acid solution adding system in the embodiment 1; the difference lies in that: the electronic vaporizer 2 is replaced by a fin heat exchanger, and carbon dioxide gas is heated to have a temperature of more than 20 ℃ by the fin heat exchanger; the carbonic acid solution pipeline 15 is a small-diameter pipeline of DN25, the channel for releasing the carbonic acid solution is a combination of small holes and narrow slits, the middle of the channel is provided with a row of narrow slits 8, and two sides of the channel are respectively provided with a row of small holes 9.

Example 5

The small-sized carbonic acid solution adding system in the embodiment is basically the same as the carbonic acid solution adding system in the embodiment 1; the difference lies in that: the liquid carbon dioxide storage tank 1 and the electronic vaporizer 2 are not arranged, and are replaced by a dewar tank or a steel cylinder. The carbon dioxide gas is discharged from a Dewar flask or a steel cylinder, heated to the temperature of more than 20 ℃ by a gas heater 3, and then regulated to the pressure of more than 6bar by a pressure regulating valve group 10; carbon dioxide gas having a temperature of 20 ℃ or higher and a pressure of 6bar or higher is fed into the reaction tank 5 from the tank top through the gas pipe 12, and the air in the tank is discharged; meanwhile, low pH water (low pH effluent water treated by a carbonic acid adding process) is pressurized to be more than 3bar through a water pump 4 and then is sent into a reaction tank 5 in a high-pressure mist form from the top of the tank through a water pipeline 11, and the pressure in the tank is kept to be more than 3 bar; in the reaction tank 5, the carbon dioxide gas is mixed with the pressurized reaction water mist to form a gas-liquid mixture with a certain pressure; because the contact area of the water mist and the carbon dioxide gas is large, and the carbon dioxide gas is quickly dissolved in water and reacts to generate carbonic acid solution in a set pressure environment; with the continuous feeding of carbon dioxide gas, when the pressure in the reaction tank reaches more than 6bar, the carbonic acid solution in the tank is converted into saturated carbonic acid solution; the saturated carbonic acid solution is pumped to a control valve 14 capable of accurately controlling flow and pressure through a pipeline at the bottom of the reaction tank 5, the control valve 14 seals the saturated carbonic acid solution between the reaction tank 5 and the control valve 14, and the saturated carbonic acid solution becomes supersaturated carbonic acid solution due to the continuous pressure in the reaction tank 5; opening the control valve 14, the supersaturated carbonic acid solution passing through the valve cartridge in the control valve 14, the supersaturated carbonic acid solution being delivered to the diffuser 6 through the pipe; the supersaturated carbonic acid solution forms a mixed solution of a high-concentration carbonic acid solution and a small amount of carbon dioxide microbubbles through small holes and/or narrow gaps in the diffuser 6, the mixed solution is reversely sprayed into water, the carbonic acid solution meets alkaline substances in the water and starts to perform acid-base neutralization reaction, and the small amount of carbon dioxide microbubbles are absorbed by the water flow.

Claims

1. A small-sized carbonic acid solution adding system is characterized by comprising a reaction tank, a diffuser, a carbon dioxide gas pipeline and a reaction water pipeline; a water mist nozzle and a carbon dioxide gas nozzle are arranged on the top of the inner tank of the reaction tank; a water pump is arranged on the reaction water pipeline; the outlet of the water pump is connected with the water inlet and the water mist nozzle on the top of the reaction tank through a water pipeline; a pressure regulating valve set is arranged on the carbon dioxide gas pipeline; the outlet of the pressure regulating valve group is connected with a carbon dioxide gas inlet and a carbon dioxide gas nozzle on the top of the reaction tank; the outlet at the bottom of the reaction tank is connected with the inlet of the diffuser; a control valve or a flow-limiting orifice plate or a throttling hole which can accurately control the flow and the pressure is arranged on a carbonic acid solution pipeline between an outlet at the bottom of the reaction tank and an inlet of the diffuser; the diffuser is arranged in the water to be treated; the diffuser is a hollow cylindrical object with one open end and the other closed end; a passage for releasing carbonic acid solution is arranged on the cylindrical side wall of the diffuser; the channel for releasing the carbonic acid solution is a small hole or a narrow gap, or a combination of the small hole and the narrow gap; the channel for releasing the carbonic acid solution can generate certain back pressure and enables the supersaturated carbonic acid solution to be sprayed into the water to be treated at certain outlet pressure, so that the pressure difference of more than 2bar is ensured between the outlet pressure of the diffuser and the pressure of the water to be treated;

the diffuser is arranged in the raw water or water pipeline which flows by water and is to be treated, is positioned at the upstream of the water flow, and a passage for releasing carbonic acid solution is arranged on one half side wall of the diffuser; the channels for releasing carbonic acid solution are one or more, or one or more rows; the diffuser is inserted into the raw water or the water pipeline in a direction perpendicular to the water flow direction, one side of the diffuser, which is provided with a passage for releasing the carbonic acid solution, is right opposite to the upstream of the water flow, so that the carbonic acid solution in the diffuser can be reversely sprayed out from the passage for releasing the carbonic acid solution opposite to the water flow and a vortex reinforced mixing effect can be generated;

alternatively, the diffuser is placed in a basin, pond or tank to be treated, where no water flows, and on both side walls or on the entire cylindrical side wall of the diffuser, there are opened a plurality or more rows of channels for releasing the carbonic acid solution.

2. The small carbonated solution dosing system of claim 1, wherein said channel for releasing carbonated solution is capable of creating a back pressure of 3bar or more and injecting supersaturated carbonated solution into the water to be treated at an outlet pressure of greater than 3 bar; the diffuser backpressure was greater than 3bar and maintained the pressure of the entire system at greater than 3 bar.

3. The small carbonated solution dosing system of claim 1 or 2, wherein the inlet of the reaction water pipeline is connected to the outlet of the water to be treated after the carbonated treatment is dosed.

4. The small-sized carbonic acid solution adding system as claimed in claim 1 or 2, further comprising a liquid carbon dioxide storage tank, an electronic vaporizer or a finned heat exchanger, and a gas heater, which are connected in sequence; or the small-sized carbonic acid solution adding system also comprises a Dewar flask or a steel cylinder and a gas heater which are connected in sequence; the outlet of the gas heater is connected with the inlet of the carbon dioxide gas pipeline.

5. The small-sized carbonic acid solution dosing system according to claim 1 or 2, wherein a water quality on-line detector is arranged at the downstream of the water flow in the raw water or water pipeline or at the water outlet of the pool, the pond or the sewage tank, and the water quality on-line detector is a pH probe or a water hardness on-line detector or a turbidity on-line detector; the water quality on-line detector is connected with the signal receiver, and the signal receiver is connected with the input end of the PLC; the output end of the PLC is connected with the control valve.

6. The small carbonated solution dosing system of claim 1 or 2, wherein the diffuser is a hollow long cylindrical object with one half of the cross section being a polygon and the other half being an arc, and one end of the hollow long cylindrical object is closed, and a passage for releasing the carbonated solution is formed on one half of the side wall of the polygon of the diffuser; the channel for releasing the carbonic acid solution is one or more rows of small holes, one or more rows of narrow gaps, or a combination of one or more rows of small holes and one or more rows of narrow gaps; or one or more apertures, one or more narrow slits, or a combination of one or more apertures and one or more narrow slits; the diffuser is inserted into the raw water perpendicularly to the water flow direction, and the side of the diffuser with the small holes and/or the narrow gaps is opposite to the upstream of the water flow, so that the carbonic acid solution in the diffuser can be sprayed out from the small holes and/or the narrow gaps in a reverse direction to the water flow.

7. The compact carbonation dosing system according to claim 6, wherein said apertures and/or slots in each row are positioned in a vertical line and are evenly spaced.

8. The small carbonated solution dosing system of claim 1 or 2, wherein a plurality of channels releasing carbonated solution on the same horizontal plane are uniformly arranged with a central included angle of less than 180 °; two adjacent channels for releasing carbonic acid solution on the same horizontal plane are arranged at an acute central included angle.

9. The small carbonated solution dosing system of claim 1 or 2, wherein a coolant coil is provided in the reaction tank, or a supplementary cooling water pipe for supplementing cooling water is provided in the lower middle portion of the reaction tank.

10. The small carbonated solution dosing system of claim 1 or 2, wherein the water mist nozzle at the top of the reaction tank is an industrial sonic nano-scale atomizer.