Standby pump system of multi-effect distillation seawater desalination device

Abstract

The utility model belongs to the field of seawater desalination, and discloses a standby pump system of a multi-effect distillation seawater desalination device, which comprises an evaporator, a one-use and one-standby water pump combination with an inlet communicated with the same mother pipe, a pump shell exhaust pipe for connecting the evaporator and a standby water pump in the one-use and one-standby water pump combination, a matched valve and a pipeline. The system can reduce the probability of exhaust faults when the standby water pump is started, and has the effects of reducing the equipment fault rate and improving the utilization rate in actual industrial production.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of standby pump systems of multi-effect distillation seawater desalination device, belong to seawater desalination technical field. BACKGROUND

[0002] Seawater desalination is one of the most important ways to solve the shortage of freshwater resources in coastal areas. The basic principle of seawater desalination is a technology for separating freshwater from seawater. According to the different forms of energy in the desalination process, seawater desalination technology is mainly divided into thermal method technology which consumes heat energy and membrane method technology which consumes electric energy.

[0003] Multi-effect distillation (MED) technology is the second generation of thermal method seawater desalination technology recognized by the industry and is the development direction of thermal method seawater desalination technology. The heat sources available for MED usually include steam turbine extraction steam, high back pressure steam turbine exhaust steam, and hot water. Depending on the different forms of heat sources, different system configurations are formed, such as MED-TVC, MED, and F-MED.

[0004] The multi-effect distillation process requires the device to operate under negative pressure, and the inlet of the supporting water pump is also under negative pressure. Using conventional design schemes may result in the inability to completely discharge the gas inside the pump body, and the standby pump cannot be normally put into operation within a short period of time, affecting production. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to discharge the gas inside the standby pump housing as much as possible under the condition that the water pump inlet is under negative pressure, in order to achieve the purpose of not affecting the operation and use of the pump.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a standby pump system of a multi-effect distillation seawater desalination device, comprising an evaporator, a one-use-one-backup water pump combination connected to the same mother pipe, a pump housing exhaust pipe connected to the standby water pump in the evaporator and the one-use-one-backup water pump combination, a supporting valve, and a pipeline.

[0007] According to the utility model, further, the evaporator is under negative pressure, the one-use-one-backup water pump combination includes a water pump put into operation and a standby water pump, and the standby water pump, the pipeline, and the evaporator are used in cooperation to realize the exhaust of the housing of the standby water pump under negative pressure.

[0008] According to the utility model, further, under the conditions of multi-effect distillation process, the air in the housing of the standby water pump enters the evaporator through the pump housing exhaust pipeline connected thereto, and the air in the housing of the standby water pump is exhausted. Thus, the standby pump can be normally started, and production activities can be maintained.

[0009] Compared with the prior art, the utility model discloses the beneficial effect is: through the combination application of pipeline, multiple effect distillation evaporator and standby water pump, the optimization system of standby pump starting is formed. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is standby pump system's schematic diagram of the multiple effect distillation seawater desalination device of the utility model;

[0011] Figure 2 It is standby pump system's schematic diagram of the multiple effect distillation seawater desalination device of the prior art.

[0012] In the drawing: 1-evaporator, 2-one use one spare water pump combination, 3-pump shell exhaust pipe, 4-matching valve. DETAILED DESCRIPTION

[0013] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings of the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0014] Please refer to Figure 1 It is standby pump system's schematic diagram of the multiple effect distillation seawater desalination device of the utility model;The standby pump system includes evaporator 1, one use one spare water pump combination 2, the pump shell exhaust pipe 3 of connecting evaporator 1 and spare water pump, the matching valve 4 of controlling pipeline on-off and pipeline. One use one spare water pump combination 2 includes a water pump and a spare water pump in operation.

[0015] In the embodiment of the application, when working normally, one water pump is put into operation, and the other water pump is standby, the outlet valve of the water pump in operation is opened, the outlet valve of the standby water pump is closed, and the inlet of the two water pumps comes from the same mother pipe, the mother pipe is connected with the evaporator 1 above, and the evaporator is negative pressure.

[0016] When the water pump in operation fails and needs to stop running, the standby water pump needs to be started to maintain production. When the standby water pump is started, a small amount of air is accumulated in the pump body of the standby water pump due to pipeline and valve leakage, and the air enters the evaporator 1 through the pump shell exhaust pipe 3 connected therewith, so that the standby water pump can operate normally.

[0017] Figure 2The schematic diagram of the standby pump system of the prior art is shown, and the difference between the utility model and the prior art is that the prior art does not have a pump shell exhaust pipe. The prior art is applicable to a positive pressure condition, and the internal gas can be discharged to the external air when the standby water pump is started. However, under the condition of the multi-effect distillation process, the pump inlet is under negative pressure, and the pressure in the pump body is lower than the external atmospheric pressure, so the air cannot be directly discharged. At this time, when the standby water pump is started, there is a high probability that the pump cannot normally operate due to the air in the pump body not being completely discharged. In the embodiment of the application, the pump shell exhaust pipe 3 is arranged in communication with the evaporator 1 and the standby water pump, so that the air in the standby water pump can be smoothly discharged under the condition of negative pressure, and the standby water pump can normally operate, the exhaust failure rate is reduced, and the production can be maintained in practice, and the utilization rate of the equipment is improved.

[0018] The above is only the preferred embodiment of the utility model, but the protection scope of the utility model is not limited to this. Any person skilled in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, and all of them should be covered in the protection scope of the utility model.

Claims

1. A backup pump system for a multi-effect distillation seawater desalination device, characterized in that: It includes an evaporator, a combination of one working and one standby water pump with its inlet connected to the same main pipe, a pump casing exhaust pipe connecting the evaporator and the standby water pump in the combination, and matching valves and pipes.

2. The backup pump system of a multi-effect distillation seawater desalination device according to claim 1, characterized in that, The evaporator is under negative pressure. The combination of one working and one standby water pump includes one pump in operation and one standby water pump. The standby water pump, pipeline and evaporator are used in conjunction to achieve the venting of the standby water pump casing under negative pressure.

3. The backup pump system of a multi-effect distillation seawater desalination device according to claim 2, characterized in that, Under multi-effect distillation process conditions, the air inside the housing of the standby water pump enters the evaporator through the pump housing exhaust pipe connected to it, thereby venting the air inside the housing of the standby water pump.

Images