CN220811995U - Water supply disinfection system - Google Patents

Abstract

The utility model discloses a water supply disinfection system, including a chlorine dioxide disinfectant preparation unit and a water supply pipeline. The water supply pipeline is provided with a pressure sensor for detecting whether the water supply pipeline starts to supply water, a flow meter for detecting the water supply flow rate, and a disinfectant input port; the chlorine dioxide disinfectant preparation unit includes a sodium chlorite aqueous solution addition unit, a hydrochloric acid addition unit, a reactor, and a control device; the disinfectant output port is connected to the disinfectant input port through a pipeline, the pressure sensor, the flow meter, and the liquid level meter all transmit detection signals to the control device, and the control device controls the operation of the two metering pumps of the two addition units. The utility model realizes the on-site preparation and use of chlorine dioxide by allowing chlorine dioxide and reaction residual liquid to be added to the water supply in real time, and realizes real-time disinfection of the water supply.

Description

Water supply disinfection system

Technical Field

The utility model relates to a water supply disinfection system.

Background technique

Liquid chlorine was once widely used in water supply disinfection treatment processes, but chlorine disinfection produces trihalomethanes (THMs), haloacetic acids (HAAS) and other "three-causing" substances (carcinogenic, teratogenic and mutagenic), so people began to use chlorine dioxide to replace liquid chlorine for water supply disinfection. However, since chlorine dioxide is unstable and highly corrosive, it is not easy to store and transport. Therefore, the development of equipment that can be prepared and used on-site has become a prerequisite for using chlorine dioxide to disinfect water supply.

Utility Model Content

In view of the problems existing in the prior art, the purpose of the utility model is to provide a water supply disinfection system.

To achieve the above-mentioned purpose, the utility model provides a water supply disinfection system, comprising a chlorine dioxide disinfectant preparation unit and a water supply pipeline. The water supply pipeline is provided with a pressure sensor for detecting whether the water supply pipeline starts to supply water, a flow meter for detecting the water supply flow rate and a disinfectant inlet; the chlorine dioxide disinfectant preparation unit comprises a sodium chlorite aqueous solution addition unit, a hydrochloric acid addition unit, a reactor, and a control device. The sodium chlorite aqueous solution addition unit and the hydrochloric acid addition unit both comprise a raw material barrel, a connecting pipeline and a metering pump. The raw material barrel is a closed structure, on which a level gauge for real-time detection of the raw material liquid level in the raw material barrel and a one-way air inlet valve for balancing the internal and external pressures of the raw material barrel are provided. The two raw material barrels contain respectively The reactor is filled with sodium chlorite aqueous solution and hydrochloric acid. The reactor is a vertical structure, and the whole is a tube with end walls at both ends. The upper end wall is provided with a raw material input port, and the lower end wall is provided with a disinfectant output port. The inlet pipeline of the metering pump is inserted into the raw material barrel, and the outlet pipeline of the metering pump is connected with the raw material input port; the disinfectant output port is connected with the disinfectant input port through a pipeline. The pressure sensor, the flow meter and the liquid level meter as a feedback device for the actual output amount of the corresponding raw materials all transmit detection signals to the control device. The control device controls the operation of the two metering pumps of the two dosing units to add the sodium chlorite aqueous solution and the hydrochloric acid to the reactor.

Furthermore, a one-way valve is provided at the inlet of the inlet pipeline of the metering pump.

Furthermore, a back pressure valve is provided on the outlet pipeline of the metering pump.

Furthermore, the metering pump is a diaphragm metering pump, and the liquid level meter is an ultrasonic liquid level meter or a float liquid level meter.

Furthermore, the raw material input port of the reactor is externally connected to a T-shaped three-way joint, the middle interface of the three-way joint is directly or through a pipeline connected to the raw material input port, and the two interfaces of the three-way joint arranged in a straight line are respectively connected to the outlet pipelines of the two metering pumps.

Furthermore, the inner cavity of the reactor has a sufficient length to allow the two raw materials to complete the reaction before flowing to the disinfectant outlet at the lower end of the reactor.

Furthermore, the inner cavity of the reactor is cylindrical, with an inner cavity diameter of 20-80 mm and an inner cavity length of 200-600 mm.

Furthermore, the reactor is composed of a cylindrical tube body in the middle and end caps buckled at both ends thereof, the upper end cap is provided with the raw material input port, and the lower end cap is provided with the disinfectant output port.

Furthermore, the concentration of the sodium chlorite aqueous solution is 8%, the concentration of the hydrochloric acid is 9%, and the sodium chlorite aqueous solution and the hydrochloric acid are added to the reactor in a volume ratio of 1:1.

The utility model enables the chlorine dioxide and the reaction residual liquid to be put into the water supply in real time, so that the chlorine dioxide is prepared on site and used on site, and the water supply is disinfected in real time.

The utility model uses a liquid level meter to feedback the actual output of the raw materials, so that the control device can control the flow of the metering pump in real time according to the actual output, ensuring that the two raw materials are added according to the set ratio and the set amount. A vertical tubular reactor is adopted, and the raw materials react while flowing, which not only ensures that the raw materials react quickly and fully. A pressure sensor is used to detect whether water supply has started in the water supply pipeline, which avoids the disinfectant being added when there is no water and corroding and damaging the water supply pipeline. By setting a flow meter, the chlorine dioxide disinfectant preparation unit can adjust the production of the disinfectant according to the water supply flow, which not only ensures the effective disinfection of the water body, but also avoids too much disinfectant being added to the water body.

A one-way valve is set at the inlet of the metering pump inlet pipeline to prevent the backflow of raw materials and avoid the increase of flow channel resistance or even blockage of the flow channel due to the crystallization of raw materials caused by the emptying of the metering pump and pipeline. A back pressure valve is set on the outlet pipeline of the metering pump, and the back pressure valve and the one-way valve are used to form a raw material holding structure, which not only prevents the backflow of raw materials, but also prevents the raw materials from flowing downstream from the outlet pipeline. At the same time, it also prevents the raw materials in the upstream pipeline of the back pressure valve, the metering pump and the raw material barrel from being sucked out when negative pressure appears in the pipeline on the outlet side of the back pressure valve. A T-shaped three-way joint is used at the raw material input port of the reactor to receive the two raw materials, and the two raw materials are forcibly mixed in advance, which accelerates the reaction of the raw materials and makes the two raw materials more fully mixed after entering the reactor. An 8% sodium chlorite aqueous solution and a 9% hydrochloric acid concentration are used as raw materials to ensure that the two raw materials react quickly and fully in the reactor and obtain a chlorine dioxide conversion rate of more than 95%.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic diagram of the structure of the utility model.

In the figure: 1 raw material barrel 1, 2 raw material barrel 2, 3 reactor, 3.1 reactor body, 3.2 reactor end, 3.3 connecting pipe, 3.4 T-shaped three-way joint, 4 metering pump 1, 5 metering pump 2, 6 float type liquid level gauge, 6.1 liquid level gauge rod, 6.2 liquid level gauge float, 7 one-way air inlet valve, 8 one-way valve, 9 back pressure valve, 10 raw material barrel cover, 11 pressure sensor, 12 flow meter.

Detailed ways

The present invention will be described below in conjunction with the embodiments.

FIG. 1 shows an example of a water supply disinfection system of the present invention.

As shown in the figure, the water supply disinfection system in this example includes a chlorine dioxide disinfectant preparation unit located at the upper part and a water supply pipeline located at the lower part, wherein a pressure sensor 11, a flow meter 12 and a disinfectant inlet are provided on the water supply pipeline, the pressure sensor 11 is used to detect whether the water supply pipeline starts to supply water, and the flow meter 12 is used to detect the water supply flow in the water supply pipeline, and the pressure sensor 11 and the flow meter 12 are electrically connected to the control device in the corresponding chlorine dioxide preparation unit and transmit the signal to the control device.

The chlorine dioxide disinfectant preparation unit includes a reactor 3, a sodium chlorite aqueous solution dosing unit located on the left side of the reactor 3, a hydrochloric acid dosing unit located on the right side of the reactor 3, and a control device; the sodium chlorite aqueous solution dosing unit includes a raw material barrel 1, a metering pump 4 and its upstream and downstream connecting pipelines, the inlet pipeline of the metering pump 4 is inserted into the raw material barrel 1, a one-way valve 8 is provided at the inlet of the inlet pipeline, and a back pressure valve 9 is provided on the outlet pipeline of the metering pump 4, the raw material barrel 1 is filled with sodium chlorite aqueous solution, The metering pump 4 sucks the sodium chlorite aqueous solution in the raw material barrel 1 and delivers it to the reactor 3 along the direction indicated by the arrow on the upper left side of the figure. The raw material barrel 1 is a closed structure, and a float type liquid level gauge 6 is installed on its top wall. The liquid level gauge float 6.2 floats on the liquid surface of the sodium chlorite aqueous solution and moves along the liquid level gauge rod 6.1 as the liquid level rises and falls. A one-way air inlet valve 7 and a raw material barrel cover 10 are also provided on the top wall of the raw material barrel 1. The liquid level gauge 6 is used to detect the liquid level of the sodium chlorite aqueous solution in the raw material barrel 1 in real time, and The detection signal is transmitted to the control device. When the liquid level of the sodium chlorite aqueous solution drops, the external air enters the raw material barrel 1 through the one-way air inlet valve 7 to keep the internal and external pressures of the raw material barrel 1 balanced; the hydrochloric acid dosing unit has the same structure as the sodium chlorite aqueous solution dosing unit. The metering pump 25 sucks the hydrochloric acid in the raw material barrel 2 and delivers it to the reactor 3 along the direction indicated by the arrow on the upper right side of the figure; the reactor 3 is a vertical structure, and its overall shape is a tube with end walls at both ends, and it consists of a cylindrical tube body 3.1 in the middle and buckles mounted at both ends. The reactor 3 is composed of an end head 3.2, a raw material input port is provided on the upper end head 3.2, a disinfectant output port is provided on the lower end head 3.2, the raw material input port is provided with a T-shaped three-way joint 3.4 through a connecting pipe 3.3, the middle interface of the three-way joint 3.4 is connected to the connecting pipe 3.3, and two interfaces of the three-way joint 3.4 arranged in a straight line are respectively connected to the outlet pipelines of the metering pump 1 4 and the metering pump 2 5, and the disinfectant output port on the lower end head 3.2 of the reactor 3 is connected to the disinfectant input port on the water supply pipeline through a pipeline.

The sodium chlorite aqueous solution is an 8% sodium chlorite aqueous solution, and the hydrochloric acid is a 9% hydrochloric acid, and the two are added in a volume ratio of 1:1.

By using an 8% sodium chlorite aqueous solution and a 9% hydrochloric acid solution and adding the two in a volume ratio of 1:1, the two raw materials can react quickly and fully and obtain a chlorine dioxide conversion rate of more than 95%.

The metering pump 1 4 and the metering pump 2 5 are diaphragm metering pumps, and the level meter 6 is a float level meter. Of course, various known applicable types of metering pumps can also be used, and the level meter can be an ultrasonic level meter or other applicable types of level meters.

Since the sodium chlorite aqueous solution and the hydrochloric acid react while flowing in the reactor 3, the inner cavity of the reactor 3 needs to have a sufficient length to ensure that the sodium chlorite aqueous solution and the hydrochloric acid entering the reactor 3 react completely and fully before flowing to the disinfectant outlet at the lower end of the reactor 3. At the same time, although the two raw materials are forced to be mixed in advance by using the three-way connector 3.4, in order to ensure that the two raw materials are mixed evenly and fully so as to react fully, the inner cavity diameter of the reactor 3 cannot be too large. The inner cavity diameter of the reactor 3 can be selected in the range of 20-80 mm, and the inner cavity length can be selected in the range of 200-600 mm.

When working, first, add 8% sodium chlorite aqueous solution to the raw material barrel 1, add the same volume of 9% hydrochloric acid to the raw material barrel 2, and set the corresponding working frequency of the two metering pumps according to the water supply flow, and then start the disinfection system. When the pressure sensor 11 detects that the water supply starts in the water supply pipeline, the control device starts the two metering pumps to start working, and controls the two metering pumps to add corresponding amounts of sodium chlorite aqueous solution and hydrochloric acid to the reactor 3 according to the water supply flow detected by the flow meter 12 at a volume ratio of 1:1. The sodium chlorite aqueous solution and hydrochloric acid enter the reactor 3 to react and produce a dose of chlorine dioxide corresponding to the water supply flow and form a disinfectant that is added to the water supply, thereby starting to continuously disinfect the water supply.

When the water supply flow rate changes, the control device controls the two metering pumps to change the working frequency, change the raw material dosage, and change the output of chlorine dioxide in the disinfectant, so that the chlorine dioxide dosage put into the water supply corresponds to the water supply flow rate.

As the two metering pumps work, the sodium chlorite aqueous solution and the hydrochloric acid are drawn out from their respective raw material barrels and enter the reactor 3 after being joined at the three-way joint 3.4. The two raw materials begin to react from the time of joining until they are fully reacted in the reactor 3 and in the process of flowing from top to bottom.

As the sodium chlorite aqueous solution in the raw material barrel 1 is continuously drawn out, the liquid level of the sodium chlorite aqueous solution drops, and the external air enters the barrel through the one-way air inlet valve 7 to balance the internal and external pressures of the raw material barrel 1. At the same time, the liquid level meter 6 on the raw material barrel 1 detects the liquid level value of the sodium chlorite aqueous solution in real time, and transmits the liquid level value signal to the control device in real time. The control device adjusts the working frequency of the metering pump 14 according to the actual output of the sodium chlorite aqueous solution reflected by the change in the liquid level value, so that the actual output of the sodium chlorite aqueous solution is the same as the required output, ensuring that the sodium chlorite aqueous solution is added to the reactor 3 according to the set amount. While the metering pump 14 adds the sodium chlorite aqueous solution, the control device controls the metering pump 25 in the same way to add the same volume of hydrochloric acid as the sodium chlorite aqueous solution to the reactor 3, so that the two raw materials are added to the reactor 3 at a volume ratio of 1:1.

It should be pointed out that the technical solution protected by the present utility model may also have many other specific implementations that can be made by those skilled in the art, and the above embodiments are only for illustration and do not limit the protection scope of the present utility model.

Claims (9)

1. The water supply disinfection system is characterized by comprising a chlorine dioxide disinfectant preparation unit and a water supply pipeline, wherein the water supply pipeline is provided with a pressure sensor for detecting whether the water supply pipeline starts to supply water, a flowmeter for detecting water supply flow and a disinfectant inlet; the chlorine dioxide disinfectant preparation unit comprises a sodium chlorite aqueous solution adding unit, a hydrochloric acid adding unit, a reaction kettle and a control device, wherein the sodium chlorite aqueous solution adding unit and the hydrochloric acid adding unit both comprise a raw material barrel, a connecting pipeline and a metering pump, the raw material barrel is of a closed structure, a liquid level meter for detecting the liquid level of raw materials in the raw material barrel in real time and a one-way air inlet valve for balancing the internal pressure and the external pressure of the raw material barrel are arranged on the raw material barrel, the two raw material barrels are respectively filled with sodium chlorite aqueous solution and hydrochloric acid, the reaction kettle is of a vertical structure, the whole reaction kettle is in a tubular shape with end walls at two ends, the upper end wall is provided with a raw material input port, the lower end wall is provided with a disinfectant output port, an inlet pipeline of the metering pump is inserted into the raw material barrel, and an outlet pipeline of the metering pump is connected with the raw material input port; the disinfectant delivery outlet is connected with the disinfectant feeding port through a pipeline, the pressure sensor, the flowmeter and the liquid level meter serving as a feedback device of the corresponding raw material actual output quantity are used for transmitting detection signals to the control device, and the control device controls the two metering pumps of the two feeding units to work so as to feed the sodium chlorite aqueous solution and the hydrochloric acid to the reaction kettle.

2. A water supply disinfection system as claimed in claim 1, wherein the inlet of the metering pump inlet line is provided with a one-way valve.

3. A water supply disinfection system as claimed in claim 2, wherein a back pressure valve is provided on the outlet line of said metering pump.

4. The water supply disinfection system of claim 1, wherein said metering pump is a diaphragm metering pump, said level gauge being an ultrasonic level gauge or a float gauge.

5. The water supply disinfection system of claim 1, wherein said raw material input port of said reaction kettle is externally connected with a T-shaped three-way joint, the middle interface of said three-way joint is directly or through a pipeline connected with said raw material input port, and two interfaces arranged on a straight line of said three-way joint are respectively connected with the outlet pipelines of two said metering pumps.

6. The water supply disinfection system of claim 1, wherein the interior cavity of said reaction vessel is of sufficient length to allow said aqueous sodium chlorite solution and said hydrochloric acid to react prior to flowing to said disinfectant delivery outlet at the lower end of the reaction vessel.

7. The water supply disinfection system of claim 6, wherein the reactor has a cylindrical cavity with a diameter of 20-80mm and a length of 200-600mm.

8. The water supply disinfection system of claim 7, wherein said reaction vessel comprises a central cylindrical tube body and ends fastened at both ends thereof, said raw material inlet being provided on an upper end and said disinfectant outlet being provided on a lower end.

9. The water supply disinfection system of claim 1, wherein the aqueous sodium chlorite solution is an aqueous sodium chlorite solution with a concentration of 8%, the hydrochloric acid is hydrochloric acid with a concentration of 9%, and the aqueous sodium chlorite solution and the hydrochloric acid are added to the reaction kettle in a volume ratio of 1:1.