CN113215601A

CN113215601A - Device that sodium hypochlorite generator is used for hydrogen to discharge and solution to carry

Info

Publication number: CN113215601A
Application number: CN202010057122.XA
Authority: CN
Inventors: 张毅
Original assignee: Beijing Qiqingshui Treatment Technology Co ltd
Current assignee: Beijing Qiqingshui Treatment Technology Co ltd
Priority date: 2020-01-19
Filing date: 2020-01-19
Publication date: 2021-08-06

Abstract

The invention relates to a device for discharging hydrogen and conveying sodium hypochlorite solution behind an electrolytic cell in a sodium hypochlorite generator by an electrolytic method, aiming at ensuring that the dilution and discharge process of the hydrogen is more reliable and the cost of a solution conveying mode is lower. Including storage tank (1) in the device, gas-liquid mixture body entry (2), drain pipe (3), exhaust pipe (4), discharge space (5) and one discharge valve (7) that receive liquid level control, when outlet pipe (3) export (8) department pressure is reliable when being higher than atmospheric pressure, the gas-liquid mixture body of higher pressure makes storage tank (1) be in the malleation state, discharge space (5) that have sufficient air flow and velocity of flow are discharged through exhaust pipe (4) to the hydrogen of jar interior malleation when discharge valve (7) are opened, and wherein quick dilution becomes harmless low concentration gas mixture back safe emission, the pressure differential of storage tank (1) and export (8) makes the device need not dedicated pump of throwing, just can carry the position that needs with solution low-cost through outlet pipe (3).

Description

Device that sodium hypochlorite generator is used for hydrogen to discharge and solution to carry

Technical Field

The invention relates to a device for discharging hydrogen and conveying sodium hypochlorite solution after an electrolytic cell of a sodium hypochlorite generator by an electrolytic method.

Background

The electrolytic sodium hypochlorite generator generates a sodium hypochlorite solution in an electrolytic cell by electrolyzing low-concentration saline water, a certain amount of hydrogen is generated during electrolysis, the sodium hypochlorite solution and the hydrogen are discharged from the electrolytic cell in a gas-liquid mixture state, a device is needed to separate the hydrogen from the sodium hypochlorite solution, the hydrogen with possibility of explosion is safely diluted and discharged, the hydrogen concentration in mixed gas is ensured to be out of an explosion limit range in the process, and the separated sodium hypochlorite solution is conveyed to a required position, such as a container for storing the sodium hypochlorite solution or a water body to be treated.

In the existing sodium hypochlorite generator, the partial function is completed by a device consisting of three main devices: the device comprises a normal pressure container, a fan and a feeding pump, which form the device with other pipelines and circuits. The hydrogen and sodium hypochlorite solution mixture discharged from the electrolytic cell is discharged into the normal pressure container through a pipeline, the hydrogen is gathered in the upper space of the container after escaping, and the sodium hypochlorite solution is positioned at the lower part of the container. There are two configurations for diluting and discharging hydrogen, the first: the normal pressure container is a sealing structure, the air outlet of the fan is connected to the upper part of the container, the blown air dilutes the hydrogen into mixed gas with the hydrogen concentration outside the explosion limit range, and the mixed gas is discharged into a safe space through an air pipe connected to the upper part of the container. And the second method comprises the following steps: the normal pressure container is provided with an opening communicated with an external space, an air inlet of the fan is connected to the upper part of the container, external air is sucked from the opening and mixed with hydrogen on the upper part of the container when the fan operates to form mixed gas with the hydrogen concentration outside the explosion limit range, and the fan blows the mixed gas into an air pipe connected to an air outlet of the fan to be discharged into a safe space. The two hydrogen dilution discharge structures have the common problems that: the hydrogen escape process and the air and hydrogen mixing process are carried out in the upper space of the normal pressure container, the position and the amount of the hydrogen escape are uncertain, the uncertainty is strengthened by the change of the liquid level in the normal pressure container, the flow and the flow speed of the mixed air flow at each position of the upper space are also uneven, the uneven mixing process enables the possibility that local hydrogen is not diluted effectively in time in the upper space of the container, the possibility that the hydrogen concentration in local mixed gas is in an explosion limit range, the possibility that the local mixed gas in the container is exploded by matching with certain ignition conditions, and the accident that the hydrogen in the normal pressure container is exploded to damage the solution outflow of the container in practical application has occurred. In addition, in the device in the prior art, a dosing pump is used for sucking out the sodium hypochlorite solution in the container through a pipeline and conveying the sodium hypochlorite solution to a required position, the solution conveying mode is reliable, and the cost of the device is high due to the use of the special dosing pump.

Disclosure of Invention

The main object of the present invention is to provide a device for hydrogen discharge and solution delivery in a hypochlorite generator which ensures that the mixing process of hydrogen and air is safe and reliable, and that the mixed gas has no possibility of local hydrogen concentration within the explosive limit. Another object of the invention is to make the device less costly than the prior art, given that it is also capable of performing the function of delivering a sodium hypochlorite solution.

The device provided by the invention comprises the following parts: the device comprises a storage tank with a sealed pressure-bearing structure, a gas-liquid mixture inlet on the storage tank, a liquid outlet pipeline led out from the storage tank, a gas exhaust pipeline led out from the storage tank and connected with a discharge space, and a gas exhaust valve arranged on the gas exhaust pipeline and controlled by liquid level. During operation, sodium hypochlorite solution flowing out of an electrolytic tank of a sodium hypochlorite generator and a gas-liquid mixture of hydrogen are discharged into a storage tank through a gas-liquid mixture inlet, the hydrogen and the solution are separated under the action of gravity, the hydrogen is gathered at the upper part of the storage tank, the solution is positioned at the lower part of the storage tank, the hydrogen at the upper part is discharged from an exhaust pipeline through an exhaust valve controlled by liquid level, the opening or closing of the exhaust valve is controlled by the liquid level in the storage tank so as to keep the liquid level in the tank basically stable within a certain range, prevent the solution with overhigh liquid level from entering the exhaust pipeline or the hydrogen with overlow liquid level from entering the liquid outlet pipeline, the exhaust valve is opened or enlarged when the liquid level is low, the exhaust valve is closed or reduced when the liquid level is high, the inlet position of the liquid outlet pipeline is lower than the liquid level in the tank, and external conditions or external conditions are adjusted so that the pressure at the outlet of the liquid outlet pipeline is higher than atmospheric pressure, like this along with when the gas-liquid mixture pours into the storage tank into under the effect of higher external pressure, the pressure of storage tank will rise to the state that is greater than liquid outlet pipe way exit pressure, and this pressure differential keeps the storage tank to be in a malleation state, and in outside air can not get into the storage tank, hydrogen only flowed to from inside to outside one of jar when discharge valve opened, and outside air can not flow back. The mixing of hydrogen and air only takes place near the exhaust pipe exit at the junction of exhaust pipe and exhaust space, so that pure hydrogen without explosion danger can be quickly diluted into mixed gas with hydrogen concentration lower than explosion limit as long as air with sufficient flow and flow velocity flows through the location, in addition, sodium hypochlorite solution at the lower part of the storage tank is injected into the liquid outlet pipe through the inlet of the liquid outlet pipe immersed under the liquid level by the pressure difference, and the solution is conveyed to the required location through the liquid outlet pipe and the outlet thereof.

The exhaust valve controlled by liquid level and installed on the exhaust pipeline of the invention can have various schemes, the preferred scheme is to adopt a float valve positioned at the inlet of the exhaust pipeline in the storage tank, when the liquid level in the tank is reduced, the float valve is opened or the opening is increased to increase the exhaust amount, when the liquid level in the tank is increased, the float ball is raised to decrease the opening or the valve is closed to reduce the exhaust amount or stop the exhaust, and the process maintains the basic stability of the liquid level in the tank. Another scheme is as follows: the controller keeps the position of the liquid level in the storage tank basically stable by controlling the opening and closing of an electric valve or an electromagnetic valve arranged on an exhaust pipeline, the controller opens or increases the opening of the valve to increase the exhaust gas volume when the liquid level in the tank is reduced, and the controller decreases the opening of the valve or closes the valve when the liquid level in the tank is increased.

According to the invention, the sodium hypochlorite solution is directly conveyed to a required position through a liquid outlet pipeline by utilizing the pressure of a gas-liquid mixture flowing out of an electrolytic tank and the pressure resistance of a storage tank, the position is called as a feeding point, when the feeding point is a pipeline or a container through which a water body to be treated flows, the device can directly complete the feeding of the sodium hypochlorite disinfectant, when the pressure of the feeding point is higher than the pressure of the gas-liquid mixture, the sodium hypochlorite solution cannot be conveyed out, but the pressure of the gas-liquid mixture is higher than the pressure of the feeding point in many cases, and in this case, the feeding function of the solution can be also completed without installing a special feeding pump. When the adding points are more than one or the adding point pressure is different, sodium hypochlorite solution can be simultaneously conveyed for a plurality of adding points by simply increasing the resistance of the liquid outlet pipeline corresponding to the low-pressure adding points with appropriate number of liquid outlet pipelines, in addition, a check valve can be arranged on the pipelines for preventing the liquid in the liquid outlet pipeline from flowing back, in the hydrogen discharging process, in order to ensure that the air with normal pressure in the external environment can not enter the storage tank to form mixed gas with explosion danger, the pressure in the tank is higher than the atmospheric pressure, the pressure in the storage tank is higher than 0.02MPa, the external air can not enter the tank under the condition that an exhaust valve is opened, the higher the pressure in the tank is, the air can not enter the storage tank, if the pressure in the storage tank is kept to be higher than 0.04MPa, the external air can not flow back, the adding points are connected with the storage tank through the liquid outlet pipeline, the pressure of the storage tank is slightly higher than the pressure of the feeding point, the pressure of the feeding point is ensured to be a sufficiently high positive pressure if the pressure of the storage tank is ensured to be more than 0.02MPa or 0.04MPa, when the pressure of the feeding point is possibly normal pressure or negative pressure, the position height of the feeding point is required to be increased to improve the pressure of the feeding point, or the resistance of the liquid outlet pipeline is required to improve the pressure in the storage tank, and the important condition for ensuring that the pressure in the storage tank is a reliable positive pressure is the operation condition of the device.

The discharge space in the invention refers to a space through which air with sufficient flow rate and flow velocity flows, the air with sufficient flow rate and flow velocity enables the hydrogen discharged by the exhaust pipeline to be quickly diluted into low-concentration mixed gas which can not be ignited, and the hydrogen concentration in a certain volume of mixed gas in the process of mixing the hydrogen and the air is in an explosion limit range, however, if the process is fast enough, the volume of the mixed gas in the explosion limit range is small, and explosion is impossible, and the mixed gas in the explosion limit range is ensured in the safety view.

The device provided by the invention avoids the possibility that external air enters the tank to form combustible and explosive mixed gas by utilizing the positive pressure state of the storage tank, the hydrogen is discharged into the discharge space in a controllable manner through the exhaust valve, and the hydrogen is safely diluted and discharged by utilizing the air with sufficient flow and flow velocity in the discharge space, so that the safety of the hydrogen discharge process is ensured. According to the device provided by the invention, under the condition that the pressure of the gas-liquid mixture is greater than the pressure of the adding point, the sodium hypochlorite solution can be conveyed to a required position only by using the liquid outlet pipeline, and compared with the scheme of using the adding pump in the prior art, the system is simplified, and the cost is reduced.

Drawings

FIG. 1 is a structural diagram of the device in the case that an exhaust valve is a float valve in a storage tank according to the present invention.

FIG. 2 is a block diagram of an apparatus of the present invention in which the exhaust valve is an electric needle valve under the control of a controller.

FIG. 3 is a structural diagram of an apparatus in which an exhaust valve is an electromagnetic valve under the control of a controller according to the present invention.

Detailed Description

Referring to fig. 1, a storage tank 1 is a container with a sealed pressure-bearing structure made of corrosion-resistant plastic materials, and can be obtained by a method of bonding, welding or mechanical connection with a sealed structure, a gas-liquid mixture 11 flowing out of an electrolytic tank of a sodium hypochlorite generator flows into the storage tank through a gas-liquid mixture inlet 2 on the storage tank, hydrogen is separated and gathered at the upper part of the storage tank under the action of gravity, a sodium hypochlorite solution is positioned at the lower part of the storage tank, a fan 13 blows air to the outside through an air pipe, the space in the air pipe with enough air volume and air speed is a discharge space 5, the air outlet of an exhaust pipeline 4 is positioned in the air pipe, and the air inlet at the other end of the exhaust pipeline is positioned in the storage tank 1. In this embodiment, the exhaust valve 7 controlled by the liquid level is a ball float valve installed on the air inlet of the exhaust pipe 4, the liquid outlet pipe 3 is provided with a check valve 10, the inlet of the check valve is positioned below the liquid level in the storage tank, the outlet 8 at the other end of the check valve is connected to a pipeline 12 through which a water body to be treated flows, the pressure in the pipeline 12 is 0.02-0.2MPa, and the pressure of tap water for supplying water to the electrolytic tank of the sodium hypochlorite generator is greater than 0.2 MPa. The gas-liquid mixture pours into storage tank 1 into under the effect of running water pressure into, and the pressure in the storage tank can rise gradually to the state that is higher than 12 internal pressures of pipeline, and sodium hypochlorite solution is the water disinfection through drain pipe 3, check valve 10 and 8 injection pipe 12 of export under the effect of pressure differential, and the tuber pipe is discharged through exhaust pipe 4 to the hydrogen of the interior malleation of storage tank 1 when the ball-cock assembly is opened, because the interior pressure of storage tank 1 is for being greater than 0.02 MPa's malleation, does not have the backward flow of air. The hydrogen in the exhaust pipeline 4 and the space in the storage tank 1 is high-concentration hydrogen which can not be ignited, and the discharged hydrogen is quickly blown into harmless low-concentration mixed gas by the air with sufficient flow and wind speed in the air pipe, so that the safe discharge of the hydrogen is realized.

Fig. 2 shows an apparatus of another construction, which differs from the apparatus of fig. 1 in that: firstly, the exhaust valve 7 controlled by the liquid level is an electric needle valve arranged on an exhaust pipeline 4 outside the storage tank 1, the controller 9 receives signals of the liquid level sensor 6 and controls the opening and closing of the electric needle valve and the opening degree according to the height of the liquid level so as to keep the liquid level in the storage tank 1 basically stable, and the liquid level sensor 6 is an ultrasonic liquid level sensor in the embodiment; the second is that the discharge space 5 is the space enclosed by the air exhaust duct 14 in the building ventilation system, and the air with enough flow and wind speed in the air exhaust duct 14 leads to the outside; thirdly, the liquid outlet pipeline 3 is not provided with other valves, a liquid outlet of the liquid outlet pipeline is arranged at the bottom of the high-level water tank 15 which is 5 meters away from the upper part of the storage tank 1, when the device works, as long as the pressure of tap water for supplying water to an electrolytic tank of the sodium hypochlorite generator is greater than the static pressure corresponding to the height of the liquid level in the high-level water tank 15, the solution in the tank can be injected into the high-level water tank 15 through the liquid outlet pipeline 3 and the outlet 8, a short solution backflow state can be generated in the process, but the total effect of the solution injected into the water body is not influenced, the static pressure of the high-level water tank 15 enables the storage tank to be in a reliable positive pressure state, and when the electric needle valve is opened, hydrogen is discharged into the discharge space 5 in a backflow-free state and is rapidly diluted into mixed gas with the hydrogen concentration lower than the explosion limit.

FIG. 3 shows a device for use with a small sodium hypochlorite generator cell, which differs from the device shown in FIG. 1: firstly, the exhaust valve 7 controlled by the liquid level is an electromagnetic valve arranged on an exhaust pipeline 4 outside the storage tank 1, the controller 9 receives signals of the liquid level sensor 6 and controls the opening and closing of the electromagnetic valve according to the height of the liquid level so as to keep the liquid level in the storage tank 1 basically stable, and the liquid level sensor 6 is a float switch with high and low liquid level indication in the example; secondly, the discharge space 5 is only an open space; thirdly, the position to be transported by the sodium hypochlorite solution is a normal pressure plastic barrel 17 placed on the ground, at this time, in order to ensure that the storage tank 1 works in a positive pressure state, the rear half section of the liquid outlet pipeline 3 is lifted to keep the highest point 16 thereof higher than the position of the storage tank 1 by more than 3 meters, thus, the head static pressure caused by the peak 16 ensures that the pressure in the storage tank 1 is more than 0.02MPa, and the device can convey sodium hypochlorite solution into the plastic barrel 17 through the liquid outlet pipeline 3, the check valve 10 and the peak 16 as long as the pressure of tap water for supplying water to an electrolytic tank of the sodium hypochlorite generator is high enough during the work, the hydrogen at the upper part of the storage tank 1 can be conveyed to an open space serving as a discharge space 5 when the electromagnetic valve is opened, and the convection disturbance intensity of the air in the open space is enough to quickly dilute the discharged small amount of hydrogen into mixed gas with the concentration lower than the explosion limit because the amount of the hydrogen generated by the electrolytic tank of the small sodium hypochlorite generator is small.

Claims

1. The utility model provides a device that sodium hypochlorite generator is used for hydrogen to discharge and solution to carry, it includes a storage tank (1), gas-liquid mixture body entry (2) on the storage tank, drain pipe (3), exhaust pipe (4), discharge space (5), characterized by: the storage tank (1) is of a sealed pressure-bearing structure, the pressure during working is greater than 0.02MPa, and the exhaust pipeline (4) is provided with an exhaust valve (7) controlled by the liquid level.

2. The apparatus of claim 1, wherein: the exhaust valve (7) is a ball float valve positioned in the storage tank (1).

3. The apparatus of claim 1, wherein: the exhaust valve (7) is an electric needle valve which is connected with a liquid level sensor (6) and is controlled by a controller (9).

4. The apparatus of claim 3, wherein: the exhaust valve (7) is an electromagnetic valve which is connected with a liquid level sensor (6) and is controlled by a controller (9).

5. The apparatus of claim 1, 2, 3 or 4, wherein: the pressure of the storage tank (1) is more than 0.04MPa when the device works.

6. The apparatus of claim 1, 2, 3 or 4, wherein: the outlet (8) of the liquid outlet pipeline (3) is connected with a pipeline or a container through which the water body to be treated flows.

7. The apparatus of claim 5, wherein: the outlet (8) of the liquid outlet pipeline (3) is connected with a pipeline or a container through which the water body to be treated flows.

8. The apparatus of claim 7, wherein: a check valve (10) is arranged on the liquid outlet pipeline (3).