Negative pressure suction device for tubular membrane produced water

Abstract

The utility model discloses a negative pressure suction device for tubular membrane produced water, which comprises a negative pressure tank body, a suction water pump and a negative pressure meter, the negative pressure meter is fixedly arranged at the upper end of the negative pressure tank body, the suction water pump is fixedly arranged between the negative pressure tank body and a produced water removal pool through a pipe body, and the suction water pump is a variable frequency suction water pump. In the operation process of the tubular membrane, a negative pressure state is formed at the top of the negative pressure tank body through the suction of the suction water pump, and only conventionally designed circulating flow needs to be provided in the process, so that a certain flow speed is ensured to prevent pollution and blockage, but the operation pressure can be greatly reduced, and the negative pressure state of a water production side forms a relatively large transmembrane pressure difference; the variable-frequency water pump is adopted as the suction water pump, the suction water pump can overcome some negative pressure states to operate normally, the suction water pump is started, the frequency of the suction water pump is adjusted according to the numerical value of the negative pressure meter, in this way, a continuous and stable negative pressure environment can be formed in the negative pressure tank body, and therefore the stability of the transmembrane pressure difference is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a negative pressure suction device for tubular membrane water production. Background Art

[0002] The application of tubular membrane separation technology is extremely extensive. At present, the only limitation or disadvantage is that the operation condition of large-flow cross-flow filtration of tubular membrane will cause a large amount of ineffective energy consumption. In the existing technology, most membrane components do not adopt negative pressure suction, mainly because most membranes cannot tolerate negative pressure. Therefore, negative pressure suction is only used on some membranes (immersed ultrafiltration). Therefore, a device is needed to solve the above-mentioned problems. The tubular membrane skid of this device is not on the same floor as the water production pool. When the water production pool is downstairs from the skid, due to the siphon negative pressure effect, the water production volume is significantly increased and the stability is better compared to when they are on the same floor. Compared with traditional designs, the system changes are very small and the operating conditions are basically unchanged. The only difference is that the head of the circulation pump is reduced and a suction pump is added. This can reduce the operating energy consumption by 35%. The advantage is very obvious. The operation process of the tubular membrane is a large-flow circulation cross-flow filtration. In order to ensure a certain trans-membrane pressure difference, the head of the traditional circulation pump is usually 35-40m. High head means high energy consumption. Since the energy consumption of the pump is closely related to the head, reducing the head can reduce energy consumption. However, in order to ensure the trans-membrane pressure difference, this device can ensure the operating conditions by pumping on the water production side. Utility Model Content

[0003] The purpose of the present invention is to provide a negative pressure suction device for tubular membrane water production to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a negative pressure suction device for tubular membrane water production, comprising a negative pressure tank body, a suction water pump and a negative pressure gauge, wherein the negative pressure gauge is fixedly mounted on the upper end of the negative pressure tank body, the suction water pump is fixedly arranged between the negative pressure tank body and the water production tank through a tube body, and the side end of the negative pressure tank body is connected to a magnetic flap level gauge and a drain valve.

[0005] Preferably, the suction water pump is a variable frequency suction water pump.

[0006] Preferably, the suction water pump is a 100zx100-40-18.5 horizontal self-priming pump.

[0007] Preferably, the suction water pump is a 125zw120-20-15 non-clogging horizontal centrifugal pump.

[0008] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0009] During the operation of the tubular membrane of the utility model, a negative pressure state is formed on the top of the negative pressure tank body by suction through the suction water pump. During this process, only the conventional designed circulation flow needs to be provided to ensure a certain flow rate to prevent fouling and clogging, but the operating pressure can be greatly reduced. The negative pressure state on the water production side has formed a large trans-membrane pressure difference. The suction water pump adopts a variable frequency water pump, and the suction water pump can overcome some negative pressure states and operate normally. The suction water pump is turned on and the frequency of the suction water pump is adjusted according to the value of the negative pressure gauge. In this way, a continuous and stable negative pressure environment will be formed in the negative pressure tank body, thereby ensuring the stability of the trans-membrane pressure difference. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the main structure of the utility model.

[0011] In the figure: 1. Negative pressure tank; 2. Suction pump; 3. Negative pressure gauge; 4. Magnetic flap level gauge; 5. Drain valve. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0013] See also Figure 1 The utility model provides an embodiment: a negative pressure suction device for tubular membrane water production, comprising a negative pressure tank body 1, a suction water pump 2 and a negative pressure gauge 3, the negative pressure gauge 3 is fixedly mounted on the upper end of the negative pressure tank body 1, the suction water pump 2 is fixedly arranged between the negative pressure tank body 1 and the water production pool through a tube body, the side end of the negative pressure tank body 1 is connected to a magnetic flap level gauge 4 and a drain valve 5, the magnetic flap level gauge 4 is mainly used to monitor the liquid level in the negative pressure tank body 1 to prevent the water pump from idling, and the main purpose of the drain valve 5 is to completely drain the liquid in the negative pressure tank body 1.

[0014] The suction water pump 2 is a variable frequency suction water pump.

[0015] The suction water pump 2 is a 100zx100-40-18.5 horizontal self-priming pump.

[0016] The suction water pump 2 is a 125zw120-20-15 non-clogging horizontal centrifugal pump.

[0017] Working principle: During normal operation, the system starts the water production program, the suction water pump 2 is turned on, and the frequency of the suction water pump 2 is adjusted by the value of the negative pressure gauge 3. In this way, a continuous and stable negative pressure environment will be formed in the negative pressure tank 1, thereby ensuring the stability of the transmembrane pressure difference. The negative pressure tank 1 has two functions. One is to provide a continuous and stable negative pressure environment, and the second is to ensure that the suction water pump 2 will not suck air due to the mismatch of the front and rear water production. During the operation of the tubular membrane, the suction water pump 2 sucks at the top of the negative pressure tank 1 to form a negative pressure state. In this process, only the conventional designed circulation flow needs to be provided to ensure a certain flow rate to prevent fouling and blockage, but the operating pressure can be greatly reduced. The negative pressure state on the water production side has formed a large transmembrane pressure difference. The suction water pump 2 adopts a variable frequency water pump, and the suction water pump 2 can overcome some negative pressure conditions and operate normally. The magnetic flap level gauge 4 is mainly used to monitor the liquid level in the negative pressure tank 1 to prevent the water pump from idling. The main purpose of the drain valve 5 is to completely drain the liquid in the negative pressure tank 1.

[0018] Conventional design: circulation flow 120m 3 / h, lift 40m, power is generally 22kw.h, the improved design: circulation flow 120m 3 / h, lift 20m, power generally 11kw.h, suction pump flow 30m 3 / h, lift 20m, power is generally 3kw.h. The total energy consumption of the two is compared. The conventional design is 22kw.h, and the improved design is 14kw.h, which effectively reduces energy consumption by more than 35%;

[0019] The negative pressure device is a supplementary device for saving energy. The negative pressure device is a combination of a tank and a water pump. The original connection method between the negative pressure device and the tubular membrane is that the water produced by the tubular membrane goes directly to the tubular membrane water production pool through the water production pipe outlet. The improved process adds a negative pressure suction device to the water production pipeline to reduce the energy consumption caused by large-flow cross-flow through low-flow suction.

[0020] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A negative pressure suction device for tubular membrane water production, comprising a negative pressure tank (1), a suction water pump (2) and a negative pressure gauge (3), characterized in that: The negative pressure gauge (3) is fixedly mounted on the upper end of the negative pressure tank body (1); the suction water pump (2) is fixedly arranged between the negative pressure tank body (1) and the dewatering pool via a pipe body; and the side end of the negative pressure tank body (1) is connected to a magnetic flap level gauge (4) and a drain valve (5).

2. A negative pressure suction device for tubular membrane water production according to claim 1, characterized in that: The suction water pump (2) is a variable frequency suction water pump.

3. The negative pressure suction device for tubular membrane water production according to claim 2, characterized in that: The suction water pump (2) is a 100zx100-40-18.5 horizontal self-priming pump.

4. A negative pressure suction device for tubular membrane water production according to claim 2, characterized in that: The suction water pump (2) is a 125zw120-20-15 non-clogging horizontal centrifugal pump.

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