CN103706256B - A kind of suction type membrane system automatic vent method and device thereof - Google Patents

Abstract

The invention relates to an automatic exhaust method and a device for a pumping membrane system, belonging to the technical field of membrane systems. In the present invention, during the normal operation of the membrane system, the gas escaping from the water caused by the negative pressure generated by the suction is collected and stored in the gas collecting tank placed at a high place through the outlet main pipe of the membrane system with a slope. ; When the membrane system is backwashed, the pressure of the backwash water is used to remove the gas collected in the gas collection tank through the automatic exhaust valve installed on its upper end, and at the same time, the gas that may exist in the pipeline when the backwash pump is started Excluded through the exhaust device. The present invention can not only solve the problem of membrane system performance degradation caused by air resistance and air pockets caused by the precipitated gas, but also solve the problems of decreased backwashing effect and membrane system damage caused by the presence of gas in the system during the backwashing process. question.

Description

A kind of automatic exhaust method and device of suction membrane system

technical field

The invention relates to an automatic exhaust method and a device for a suction membrane system, belonging to the technical field of membrane systems.

Background technique

At present, membrane technology is a brand-new practical technology. Membrane separation process is a physical separation process without phase change and low energy consumption. And other characteristics, now membrane technology has been widely used in many fields, is recognized as one of the most promising contemporary high-tech.

During the operation of the suction membrane system, its interior is in a negative pressure state. The gas dissolved in water under normal air pressure will precipitate due to the pressure reduction, and will continue to accumulate in the pipeline system to form air resistance, which increases the resistance of the membrane system and affects the water production capacity of the membrane system; in severe cases, it may even form air pockets. The membrane system loses its ability to produce water. In addition, since the inside of the suction membrane system is in a negative pressure state during the operation, when the pipeline connection is not tight, it will also suck in external air to form air resistance.

When the suction membrane system is backwashed, the gas in the pipeline will also form air resistance, which will affect the backwashing effect. In addition, the gas in the pipeline may be pressed into the membrane module along with the backwash water, which may cause damage to the membrane module. Therefore, timely discharge of the gas inside the suction membrane system is a necessary condition to ensure the normal operation of the membrane system.

Contents of the invention

The present invention aims at the deficiencies of the above-mentioned problems, and provides an automatic exhaust method and device for a suction membrane system, which can effectively remove the gas precipitated in the suction membrane system and solve the air resistance caused by the gas precipitation. , The problem of performance degradation of the membrane system caused by the air bag also solves the problem of the decrease of the backwash effect and the damage of the membrane system caused by the existence of gas in the system during the backwash process, so as to ensure the stable operation of the suction membrane system.

The technical solution proposed by the present invention to solve the above-mentioned technical problems is: a method for automatic exhausting of a suction membrane system. The resulting gas escaping from the water is collected and stored in a gas-collecting tank placed at a high place. The outlet main pipe of the membrane system has a slope of not less than 3‰ and the slope of the outlet main pipe of the membrane system points to the membrane system. The direction of the membrane pool; when the membrane system is backwashed, the pressure of the backwash water is used to remove the gas collected in the gas collection tank through the automatic exhaust valve installed on its upper end, and at the same time, the gas in the pipeline when the backwash pump is started The gas that may exist is removed through the exhaust device.

The present invention also provides a suction type membrane system automatic exhaust device, which is used for the automatic exhaust of the membrane system, including the membrane system water outlet main pipe, the gas collection tank, the membrane system backwash water pump and the membrane system water production pump; the membrane system One end of the water outlet main pipe is connected to the membrane tank of the membrane system, and the other end is connected to the gas collection tank. At the same time, the membrane system outlet water main pipe has a slope of not less than 3‰ and the slope of the membrane system water outlet main pipe points to the membrane system membrane pool The direction of the gas collection tank is located above the membrane pool of the membrane system, and an inspection valve is also provided between the water outlet main pipe of the membrane system and the gas collection tank; an automatic exhaust valve is provided above the gas collection tank , a first valve is arranged between the gas collection tank and the automatic exhaust valve; the membrane system backwash water pump and the membrane system water production pump are connected to the gas collection tank through the maintenance valve, and the membrane system backwash water pump is connected to the gas collection tank A membrane system backwash water inlet valve is set between the maintenance valves, and a membrane system water outlet valve is set between the membrane system production water pump and the maintenance valve; and the first valve is linked with the backwash water pump and the backwash water inlet valve , to achieve simultaneous opening and closing.

Preferably: the first valve is a solenoid valve or a pneumatic valve.

Preferably: the gradient of the water outlet main pipe of the membrane system is 3‰.

Preferably: both the automatic exhaust valve and the first exhaust valve are installed vertically on the gas collecting tank.

A suction membrane system automatic exhaust method and its device of the present invention, compared with the prior art, has the following beneficial effects: 1. During the normal operation of the membrane system, through the pipeline with a gradient The escaping gas generated by the negative pressure is collected and stored in the gas collection tank placed at a high place, so as to solve the problem that the gas precipitated by the suction membrane system due to the negative pressure accumulates in the pipeline to form an air bag during the operation. The problem of water capacity.

2. When the membrane system is backwashed, the pressure of the backwash water is used to remove the gas collected in the gas collection tank through the automatic exhaust valve installed on its upper end, and at the same time, the gas that may exist in the pipeline when the backwash pump is started is also removed. The gas is discharged through the exhaust device, so as to solve the problem that the gas enters the membrane filament during backwashing of the membrane system and causes damage to the membrane system, and the problem of forming air resistance and affecting the effect of backwashing is solved.

In summary, the present invention can effectively eliminate the gas precipitated in the pumping membrane system, solve the problem of performance degradation of the membrane system caused by gas resistance and air pockets caused by the precipitated gas, and also solve the problems caused by the system during backwashing. The problem of the decrease of the backwashing effect and the damage of the membrane system caused by the presence of gas in the water can ensure the stable operation of the suction membrane system.

Description of drawings

Fig. 1 is the composition schematic diagram of the suction type membrane system automatic exhaust device of the present invention;

Among them, 1 is the main water outlet of the membrane system; 2 is the maintenance valve; 3 is the gas collection tank; 4 is the solenoid valve or pneumatic valve; 5 is the automatic exhaust valve; 6 is the membrane system backwash pump; 7 is the membrane system backwash water inlet Valve; 8 is the water production pump of the membrane system; 9 is the water outlet valve of the membrane system; 10 is the membrane tank.

detailed description

The accompanying drawing discloses a schematic structural view of a preferred embodiment of the present invention without limitation, and the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

Example

A method for automatic exhaust of a suction membrane system in this embodiment, as shown in Figure 1, during the normal operation of the membrane system, through the membrane system outlet main pipe with a slope, the negative pressure caused by the suction will be eliminated. The gas escaping from the water is collected and stored in a gas collecting tank placed at a high place. The outlet main pipe of the membrane system has a slope of not less than 3‰ and the slope of the outlet main pipe of the membrane system points to the membrane tank of the membrane system. Direction; when the membrane system is backwashed, the pressure of the backwash water is used to remove the gas collected in the gas collection tank through the automatic exhaust valve installed on its upper end, and at the same time, the gas that may exist in the pipeline when the backwash pump is started The gas is removed through the exhaust device.

A suction-type membrane system automatic exhaust device, as shown in Figure 1, is used for the automatic exhaust of the membrane system, including the membrane system water outlet main pipe, the gas collection tank, the membrane system backwash water pump and the membrane system water production pump; One end of the outlet main pipe of the membrane system is connected to the membrane pool of the membrane system, and the other end is connected to the gas collection tank. At the same time, the outlet main pipe of the membrane system has a slope of not less than 3‰ and the slope of the outlet main pipe of the membrane system points to the membrane system. The direction of the membrane pool; and the gas collection tank is located above the membrane system membrane pool, and an inspection valve is also set between the membrane system water outlet main pipe and the gas collection tank; an automatic exhaust valve is installed above the gas collection tank Air valve, a first valve is set between the gas collection tank and the automatic exhaust valve; the membrane system backwash water pump and the membrane system production water pump are connected to the gas collection tank through the maintenance valve, and the membrane system backwash A membrane system backwash water inlet valve is set between the water pump and the maintenance valve, and a membrane system water outlet valve is set between the membrane system production water pump and the maintenance valve; and the first valve is connected with the backwash water pump and the backwash water inlet The valves are linked to realize simultaneous opening and closing.

The first valve is an electromagnetic valve or a pneumatic valve.

The slope of the outlet main pipe of the membrane system is 3‰.

Both the automatic exhaust valve and the first exhaust valve are installed vertically on the gas collecting tank.

Specifically: the device of this embodiment includes:

A membrane system outlet main pipe with a certain slope. The membrane system outlet main pipe is sloped to the direction of the membrane module with a slope of not less than 3‰, which is used to collect the precipitated gas during the normal operation of the suction membrane system and the leakage caused by the pipeline system. The gas inhaled by the gas is transported into the gas collection tank, and the automatic exhaust device of the suction membrane system is installed at the highest point of the outlet pipe.

An inspection valve, one end is installed at the highest point of the membrane system water outlet main pipe, and the other end is installed at the bottom of the gas collection tank, which is used to isolate the membrane system during maintenance of the automatic exhaust device of the suction membrane system.

A gas collection tank with a certain volume is installed at the highest point of the outlet main pipe of the membrane system through the maintenance valve, and is used to store the gas delivered by the main outlet water pipe of the membrane system.

A solenoid valve or pneumatic valve installed at the highest point of the gas collection tank is used to isolate the negative pressure in the system from the external atmospheric pressure when the suction membrane system is in normal operation, so as to prevent the automatic exhaust valve from being sucked by the negative pressure inside the gas collection tank Air; and the solenoid valve or pneumatic valve is opened when the membrane system is backwashed, so that the automatic exhaust valve can discharge the gas.

In order to realize that the solenoid valve or pneumatic valve is closed when the membrane system is running and opened when the membrane system is backwashed, the valve is linked with the backwash water pump or backwash valve of the membrane system to open and close at the same time.

An automatic exhaust valve installed on the upper part of the solenoid valve or pneumatic valve is used to automatically remove the gas stored in the gas collection tank by the pressure of the backwash water when the suction membrane system is backwashed;

The outlet main pipe of the membrane system has a slope of not less than 3‰ towards the direction of the membrane module, and an automatic exhaust device is installed at its highest point. When the suction membrane system is running, the inside of the membrane system is under negative pressure, and the gas dissolved in the water under the atmospheric pressure gradually precipitates and forms bubbles, which are driven by the buoyancy and the outlet water flow of the membrane system to move to a high place along the outlet main pipe of the membrane system; At this time, the gas inhaled due to the air leakage of the pipeline system also moves to a high place in the outlet main pipe of the membrane system.

The maintenance valve is installed at the highest point of the outlet main pipe of the membrane system, and the upper end is connected with the gas collection tank. The gas collected from the outlet main pipe of the membrane system enters the gas collecting tank through the inspection valve. The inspection valve is normally open. When the exhaust device needs to be repaired, the inspection valve can be closed to isolate the exhaust device from the membrane system, so as to facilitate the maintenance of the exhaust device.

The gas collecting tank is connected with the outlet main pipe of the membrane system through the maintenance valve. When the suction membrane system is in normal operation, the gas entering through the maintenance valve is temporarily stored in the gas collection tank, and when the membrane system is backwashed, the pressure of the backwash water is used to discharge it through the automatic exhaust valve.

The solenoid valve or pneumatic valve is installed at the highest point of the gas collecting tank, and its upper end is connected with the automatic exhaust valve. The solenoid valve or pneumatic valve is linked with the backwash water pump or the backwash water inlet valve to realize simultaneous opening and closing. When the suction membrane system is running, that is, when the backwash pump is stopped or the backwash inlet valve is closed, the solenoid valve or pneumatic valve is also closed to separate the negative pressure in the automatic exhaust device from the external atmospheric pressure and prevent external gas from passing through. Automatic vent valves into the system. When the suction membrane system is backwashing, that is, when the backwashing water pump is turned on or the backwashing water inlet valve is turned on, the solenoid valve or pneumatic valve is also turned on. The valve or air valve enters the automatic air vent and exits the system.

The automatic exhaust valve is vertically installed on the upper part of the electromagnetic valve or pneumatic valve and connected with the gas collection tank through it. When the suction membrane system is in normal operation, the automatic exhaust valve is separated from the gas collection tank by a solenoid valve or a pneumatic valve so that it is in a closed state. When the suction membrane system is backwashed, the solenoid valve or pneumatic valve is opened to connect the automatic exhaust valve with the gas collection tank; at this time, the backwash water under positive pressure enters the gas collection tank through the maintenance valve, thereby Make the gas collecting tank in a positive pressure state, at this time the automatic exhaust valve is automatically opened, the gas in the gas collecting tank is discharged from the system through the solenoid valve or pneumatic valve and the automatic exhaust valve, and at the same time the water level in the gas collecting tank gradually rises. When the water level in the gas collection tank reaches the height of the automatic exhaust valve, the automatic exhaust valve will automatically close.

A description of how the automatic air vent operates. The operation of the automatic exhaust device is divided into four states: gas collection, exhaust, standby and maintenance. The following are respectively explained:

Gas collection status of the auto-vent. When the suction membrane system is in normal operation, the automatic exhaust device is in the state of gas collection. At this time, the maintenance valve is in the open state, the solenoid valve or pneumatic valve is in the closed state due to linkage with the backwash water pump or the backwash water inlet valve, and the automatic exhaust valve remains in the closed state at the end of the previous cycle. When the suction membrane system is in operation, due to the negative pressure inside the system, the gas precipitated from the water and the gas inhaled due to the leakage of the pipeline system are driven by the buoyancy and the water flow of the membrane system along the water collection pipe and maintenance valve of the membrane system. It enters the gas collecting tank, and the water temporarily stored in the gas collecting tank due to the exhaust gas in the previous cycle enters the membrane system water outlet main pipe and the membrane system produces water and flows out of the system together.

The exhaust status of the automatic exhaust device. When the suction membrane system enters the backwash state and starts to discharge the gas in the gas collection tank, the automatic exhaust device is in the exhaust state. At this time, the maintenance valve is in the open state, and the solenoid valve or pneumatic valve is in the open state due to the linkage with the backwash water pump or the backwash water inlet valve. Under the action of this pressure, the automatic exhaust valve opens to remove the air stored in the gas tank from the system. As the gas in the gas collection tank is continuously discharged, the water level in the tank gradually rises. When the water level in the tank reaches the automatic exhaust valve, the automatic exhaust valve will automatically close and enter the standby state.

Standby for automatic exhaust. After the exhaust of the automatic exhaust device is completed, the maintenance valve is opened; the solenoid valve or pneumatic valve remains open because the backwashing process of the membrane system has not yet ended; the water level of the gas collection tank reaches the position of the automatic exhaust valve, and the The automatic air vent valve is closed. When the membrane system completes the backwashing process, the backwashing water pump and the backwashing water inlet valve are closed, and the solenoid valve or pneumatic valve is closed due to the linkage with the backwashing water pump and the backwashing water inlet valve. Enter the gas collection state of the new round.

Service status of automatic air vents. When the automatic exhaust state needs maintenance, the maintenance valve is closed, and the automatic exhaust device is disconnected from the membrane system at this time, which can facilitate the maintenance of the automatic exhaust device without affecting the operation of the membrane system.

Adopt the effect that the present invention can achieve. Adopting the automatic exhaust method and device of the suction membrane system described in the present invention can effectively solve the problem that the water flow capacity and the membrane system are affected by the accumulation of the escaped gas in the pipeline to form air pockets during the operation of the suction membrane system. During backwashing, the gas enters the membrane filament to cause damage to the membrane system and the formation of air resistance affects the backwashing effect, thereby ensuring the efficient and stable operation of the suction membrane system

The preferred specific embodiments of the present invention described above in conjunction with the accompanying drawings are only used to illustrate the implementation of the present invention, rather than as a limitation to the foregoing invention purpose and the content and scope of the appended claims. Any simple modifications, equivalent changes and modifications made in the embodiments still belong to the technical and rights protection scope of the present invention.

Claims (5)

1. a suction type membrane system automatic vent method, it is characterized in that: in membranous system normal course of operation, by the acclive membranous system outfall sewer of tool by due to swabbing action produce negative pressure and the escaping gas in water that causes collects and is stored in the air collector being placed in eminence, this membranous system outfall sewer has slope aspect and is not less than the gradient of 3 ‰ and the slope aspect of described membranous system outfall sewer points to the direction of membranous system membrane cisterna; When membranous system carries out backwash, utilize the pressure of backwashing water to be got rid of by the automatic exhaust steam valve being mounted thereon end by the gas collected in air collector, the gas that may exist in pipeline when simultaneously also being started by backwashing pump is got rid of through exhaust apparatus.

2. a suction type membrane system automatic exhaust device, for the automatic vent of membranous system, is characterized in that: comprise membranous system outfall sewer, air collector, membranous system backwash pump and membranous system and produce water pump; Described membranous system outfall sewer one end is connected with the membrane cisterna of membranous system, and the other end is connected with air collector, and simultaneously described membranous system outfall sewer has slope aspect and is not less than the gradient of 3 ‰ and the slope aspect of described membranous system outfall sewer points to the direction of membranous system membrane cisterna; And described air collector is positioned at the top of membranous system membrane cisterna, be also provided with maintenance valve between described membranous system outfall sewer and air collector simultaneously; The top of described air collector is provided with automatic exhaust steam valve, is provided with the first valve between described air collector and automatic exhaust steam valve; Described membranous system backwash pump and membranous system are produced water pump and are all connected with air collector by maintenance valve, and being provided with membranous system backwash water intaking valve between described membranous system backwash pump and maintenance valve, described membranous system produces between water pump and maintenance valve and is provided with membranous system outlet valve; And described first valve all links with backwash pump, backwash water intaking valve, realize opening and closing simultaneously.

3. suction type membrane system automatic exhaust device according to claim 2, is characterized in that: described first valve is magnetic valve or pneumatic operated valve.

4. suction type membrane system automatic exhaust device according to claim 2, is characterized in that: the gradient of described membranous system outfall sewer is 3 ‰.

5. suction type membrane system automatic exhaust device according to claim 2, is characterized in that: described automatic exhaust steam valve, the first valve are all installed vertically on air collector.