CN111807494A - Diffuser for adjusting pH value with carbon dioxide and method for adjusting the same - Google Patents

Abstract

The invention belongs to the technical field of water treatment, and particularly discloses a diffuser for adjusting pH value by using carbon dioxide and an adjusting method, wherein the diffuser comprises a diffuser main body, and the shape of the diffuser is a hollow cylindrical tube; the diffusion device is arranged facing the raw water flow direction. The equipment and the method of the invention feed the mixed carbonic acid solution into the raw water through the diffuser to react with the alkaline substances in the raw water, thereby reducing and stabilizing the pH value of the raw water, having high utilization rate of carbon dioxide and good equipment performance.

Description

Diffuser for adjusting pH value with carbon dioxide and method for adjusting the same

technical field

The invention relates to the technical field of water treatment, in particular to a diffuser and an adjustment method for adjusting pH value by using carbon dioxide.

Background technique

At present, most of the shallow pool-type reservoirs in China have eutrophication problems such as seasonal local algal growth. Since algae need a lot of carbon dioxide in the production process, the carbon dioxide in the carbonate in the water is consumed in large quantities to form calcium hydroxide, which increases the pH value of the water.

The water plant uses aluminum salt coagulants to treat the purification of drinking water, industrial wastewater and special water quality. Aluminum is an amphoteric substance and has a certain solubility in a weak alkaline environment. Therefore, when the pH value of the reservoir increases, there is a risk of aluminum exceeding the standard in the factory water, which affects the safety of drinking water. Excessive intake of aluminum in humans can cause Alzheimer's disease, renal dysfunction, and mutagenic effects on somatic and germ cells.

At the same time, in a neutral or alkaline environment, the chlorination process used in water plants is more likely to generate disinfection by-products—THMs. The disinfection by-products THMs are mutagenic, carcinogenic and teratogenic, and can cause liver, kidney and intestinal tumors.

Therefore, both aluminum and disinfection by-products (THMs) have potential hazards to human body and must be addressed to maintain human health. At present, in response to the problem of high pH value of raw water, there are mainly two methods adopted by water plants: one is to appropriately increase the dosage of coagulant, and use the properties of strong acid and weak alkali salt of coagulant to reduce the amount of water after sinking. However, this method has limited effect of reducing pH value, needs to consume more coagulant, and increases the cost of water production; another method is to add concentrated acid directly when the pH value of raw water is high, but this method requires The construction investment of a new acid addition system is relatively large; and the strong acid is corrosive and is a dangerous chemical, which has a safety risk.

Therefore, in the field of water treatment technology, there is a long-term technical problem that needs to be solved urgently, and the pH value can be adjusted safely and scientifically.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention proposes a diffuser for adjusting pH value using carbon dioxide and a method for adjusting the same. The device and method have significant technical effects, are safe and reliable, and are easy to operate.

In order to achieve the above purpose, the present invention provides a diffuser for adjusting pH value with carbon dioxide, which is characterized by comprising: a diffuser main body, which is in the shape of a hollow cylindrical tube;

Further, the above-mentioned diffuser utilizing carbon dioxide to adjust pH value, wherein, the diffusing device is unilaterally opening holes on the cylindrical tube wall of the main body of the diffuser, the small holes are evenly distributed, and the water flow of the carbonated solution at the outlet end of the small holes is opposite to the direction of the original water flow. .

Further, the above-mentioned diffuser using carbon dioxide to adjust pH value, wherein, the pore size of the opening is one-tenth of the pipe diameter, and the opening ratio is 0.02% to 0.03%, so that the pressure at the end of the diffuser is not lower than 0.4MPa.

Further, the above-mentioned diffuser utilizing carbon dioxide to adjust pH value, wherein, the diffuser is a double-sided opening on the cylindrical pipe wall of the main body of the diffuser, and the angle between the opening direction and the cross-section of the raw water pipe wall is an acute angle, and the small hole is an acute angle. Evenly distributed.

Further, the above-mentioned diffuser for adjusting pH value with carbon dioxide, wherein the included angle is 5 to 30 degrees.

Further, the above-mentioned diffuser for adjusting pH value with carbon dioxide, wherein the included angle is 15 degrees.

Further, the above-mentioned diffuser using carbon dioxide to adjust pH value, wherein, the pore size of the opening is one-tenth of the pipe diameter, and the opening ratio is 0.03% to 0.04%, so that the pressure at the end of the diffuser is not lower than 0.4MPa.

Further, the above-mentioned diffuser using carbon dioxide to adjust pH value, wherein, the diffusing device is a convex aeration disc arranged at the end of the main body of the diffuser, the aeration disc is provided with a vortex track, and the vortex track has Several air diffusing ports make the pressure at the outlet end of the diffuser not lower than 0.4Mpa.

The present invention also provides a method for adjusting pH value by using carbon dioxide, which is characterized by comprising: mixing tap water and carbon dioxide gas in a mixer under high pressure to form a carbonic acid solution, and the carbonic acid solution is added to raw water through a diffuser to adjust The pH value of the raw water; the pressure at the end of the diffuser is not less than 0.4MPa; the shape of the main body of the diffuser is a hollow cylindrical tube; a diffuser is set on the main body of the diffuser facing the direction of the flow of the raw water; the diffuser is one of the following three:

Holes are opened on one side of the cylindrical tube wall of the main body of the diffuser, the small holes are evenly distributed, and the water flow of the carbonated solution at the outlet of the small holes is opposite to the water flow of the raw water; the pore size of the opening is one-tenth of the pipe diameter, and the opening rate is 0.02%~0.03%;

Double-sided openings are made on the cylindrical wall of the diffuser main body, the angle between the opening direction and the cross-section of the raw water pipe wall is an acute angle, and the small holes are evenly distributed; the diameter of the opening is one-tenth of the pipe diameter, and the opening The rate is 0.03%~0.04%;

A convex aeration disc is arranged at the end of the main body of the diffuser. The convex aeration disc is provided with a vortex track and has a number of air diffusing ports.

Description of drawings

Fig. 1 The working principle of carbon dioxide to adjust the pH value of raw water;

Fig. 2 is the schematic diagram of the embodiment 1 of the diffuser that utilizes carbon dioxide to adjust pH;

3 is a schematic diagram of Embodiment 2 of a diffuser utilizing carbon dioxide to adjust pH;

FIG. 4 is a schematic diagram of Embodiment 3 of a diffuser for adjusting pH value with carbon dioxide.

Detailed ways

The embodiments of the present invention will be described below through specific examples and in conjunction with the accompanying drawings, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific examples, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the spirit of the present invention.

Figure 1 is a schematic diagram of carbon dioxide regulating the pH value of raw water. The explanation of the principle is to facilitate the understanding of the diffuser setting. In the figure, tap water is pumped to mixer 01 through water pump 02, carbon dioxide gas and tap water are mixed in mixer 01 under high pressure to form carbonic acid solution, and the carbonic acid solution is added to raw water through a diffuser to adjust the pH value of raw water. The device and method of the present invention can improve the utilization rate of carbon dioxide, reduce its overflow rate, and maximize its ability to adjust pH value.

FIG. 2 is a schematic diagram of Embodiment 1 of the diffuser for adjusting pH value with carbon dioxide according to the present invention. The diffuser body 11 is made of 316L stainless steel or 304 stainless steel, which is durable and not easy to be damaged; the shape is a hollow cylindrical tube. Diffusion holes 13 are arranged facing the direction of raw water flow. The diffusion holes 13 are evenly distributed, and their pore size is one-tenth of the inner diameter of the diffuser body 11 , and the porosity is 0.02% to 0.03%. (The open porosity refers to the ratio of the area of the pores to the surface area of the entire cylinder.) Carbon dioxide gas and tap water are first mixed in the mixer, and then the raw water is added through the diffuser. The setting of the direction of the diffusion holes 13 ensures that the flow direction of the carbonic acid solution is opposite to the flow direction of the raw water, so it can react with the raw water in a timely and rapid manner and reduce the pH value of the raw water. The aperture and pressure settings can ensure that carbon dioxide gas will not escape throughout the carbon dioxide pipeline. The pressure of tap water is about 0.5Mpa, and the pressure drop of the gas-water mixer is lower than 0.1Mpa, so that the pressure at the outlet of the diffuser will not be lower than 0.4MPa, which ensures that the carbonic acid solution and the raw water are fully mixed and reacted promptly and quickly.

FIG. 3 is a schematic diagram of Embodiment 2 of the diffuser used in the water pH adjustment method of the present invention. The diffuser body is made of 316L stainless steel or 304 stainless steel, and the shape is hollow cylindrical. Diffusion holes are arranged at 15 angles to the cross section of the raw water pipeline, and the diffusion holes are evenly distributed, and the aperture is one-tenth of the pipe diameter, and the opening rate is 0.03%~0.04%. At the same time, ensure that the pressure at the outlet end of the diffuser is not lower than 0.4Mpa. The setting of the diffusion hole direction can make the carbonic acid solution collide with the inner wall of the raw water, further reduce the size of the bubbles, and increase the utilization rate of carbon dioxide. At the same time, the setting of opening rate and pressure can ensure that carbon dioxide gas will not overflow in the entire carbon dioxide pipeline.

FIG. 4 is a schematic diagram of the diffuser type 3 used in the water pH adjustment method of the present invention. The main body of the diffuser is made of 316L stainless steel or 304 stainless steel, the front section is hollow cylindrical, and the rear end is provided with a convex aeration disc. The aeration surface is provided with a vortex track, which is provided with a number of air diffusers, and the pressure at the outlet end of the diffuser is not less than 0.4Mpa. The setting of the aeration plate can increase the contact area between the carbonic acid solution and the raw water, which can better promote the reaction between the carbonic acid and the raw water in large pipelines, and effectively reduce the pH value.

The device and method of the invention add the mixed carbonic acid solution into the raw water through a diffuser, and react with the alkaline substances in the raw water, thereby reducing and stabilizing the pH value of the raw water, high carbon dioxide utilization rate, and good equipment performance.

The above-mentioned embodiments merely illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Any person skilled in the art can modify and change the above embodiments without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be as listed in the claims.

Claims (9)

1. A diffuser for adjusting pH using carbon dioxide, comprising: a diffuser body shaped as a hollow cylindrical tube; a diffuser is provided in the diffuser body facing the raw water flow direction.

2. The carbon dioxide-based pH adjusting diffuser according to claim 1, wherein the diffusing means comprises: the cylindrical pipe wall of the diffuser main body is provided with holes on one side, the small holes are uniformly distributed, and the flow direction of the carbonic acid solution at the outlet ends of the small holes is opposite to that of the raw water.

3. The carbon dioxide diffuser for adjusting pH according to claim 2, wherein the opening has a diameter of one tenth of the diameter of the pipe and an opening ratio of 0.02% to 0.03%, so that the pressure at the end of the diffuser is not lower than 0.4 MPa.

4. The carbon dioxide-based pH adjusting diffuser according to claim 1, wherein the diffusing means comprises: holes are formed in the two sides of the cylindrical pipe wall of the diffuser main body, the included angle between the hole forming direction and the cross section of the wall of the original water pipe is an acute angle, and the holes are uniformly distributed.

5. The carbon dioxide based pH adjusting diffuser according to claim 4, wherein the included angle is 5 to 30 degrees.

6. The carbon dioxide based pH adjusting diffuser according to claim 4, wherein the included angle is 15 degrees.

7. The carbon dioxide diffuser for adjusting pH according to claim 6, wherein the opening has a diameter of one tenth of the diameter of the pipe and an opening ratio of 0.03% to 0.04%, so that the pressure at the end of the diffuser is not lower than 0.4 MPa.

8. The carbon dioxide-based pH adjusting diffuser according to claim 1, wherein the diffusing means comprises: set up in the terminal convex surface aeration dish of this diffuser main part, be equipped with the vortex track on this convex surface aeration dish face, have a plurality of gas ports that disperse on this vortex track for this diffuser outlet end pressure is not less than 0.4 Mpa.

9. A method for adjusting pH by using carbon dioxide, comprising: mixing tap water and carbon dioxide gas in a mixer under high pressure to form a carbonic acid solution; adding the carbonic acid solution into raw water through a diffuser to adjust the pH value of the raw water; the pressure at the tail end of the diffuser is not lower than 0.4 MPa; the main body of the diffuser is in a hollow cylindrical tube shape; a diffuser is arranged on the diffuser body facing the raw water flow direction; the diffusion device is one of the following three parts:

the cylindrical pipe wall of the diffuser main body is provided with holes on one side, the small holes are uniformly distributed, and the flow direction of the carbonic acid solution at the outlet ends of the small holes is opposite to that of the raw water; the aperture of the opening is one tenth of the pipe diameter, and the opening rate is 0.02% -0.03%;

holes are formed in the cylindrical pipe wall of the diffuser main body at two sides, the included angle between the hole forming direction and the cross section of the original water pipe wall is an acute angle, and the small holes are uniformly distributed; the aperture of the opening is one tenth of the pipe diameter, and the opening rate is 0.03-0.04%;

set up in the terminal convex surface aeration dish of this diffuser main part, be equipped with the vortex track on this convex surface aeration dish face, have a plurality of gas outlets on this vortex track.

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