CN105983347A - Backwashing system and method for ultrafiltration device of steelmaking desalted water station - Google Patents

Abstract

The invention provides a backwashing system and method for an ultrafiltration device of a steelmaking desalinated water station. The concentrated water tank is connected to the ultrafiltration backwash fine filter through a concentrated water pipe. Two electric valves and two electric valves are arranged on the concentrated water pipe. A concentrated water pump is installed between them, and the concentrated water pump and electric valve are connected with the control computer. The reverse osmosis concentrated water with the backwash medium conductivity of the ultrafiltration device is 600-700μs/cm; the backwashing program of the control computer is compiled, and the operation and backwashing cycle of the ultrafiltration device is set at 40-45 minutes per operation, and the backwashing is 2.5-3 minutes . The water quality of the present invention is stable, and the number of backwashing times per 24 hours of continuous operation of a single set of ultrafiltration device can be reduced from 39 times to 29 times, greatly reducing the power consumption of the backwashing pump, and reducing the consumption of fresh water by 500 tons per day The above, and effectively reduce the running time of the concentrated water pump, reduce maintenance costs, and ensure the stable operation of the ultrafiltration device.

Description

A backwashing system and method for an ultrafiltration device in a steelmaking desalination station

technical field

The invention belongs to the field of water treatment equipment, and in particular relates to a backwashing system and method for an ultrafiltration device of a steelmaking desalinated water station.

Background technique

At present, the ultrafiltration devices of domestic steelmaking desalination stations are equipped with automatic backwashing systems. The backwashing water is ultrafiltration water. The operation and backwashing cycle of the ultrafiltration device is set to run for 30 minutes and backwash for 3 minutes. The setting of the automatic backwashing system is as follows: the ultrafiltration water production tank is connected to the ultrafiltration backwashing fine filter through two parallel ultrafiltration water pumps and pipelines, and the outlet ports of the ultrafiltration backwashing fine filter are respectively connected to each ultrafiltration device. The problem is:

1. The backwash cycle of the ultrafiltration device is fixed, and it is difficult to adapt to the water quality change of the water source;

2. The backwash cycle is short, which is unfavorable for reducing the self-consumption water of the ultrafiltration device and the power consumption of the ultrafiltration water pump;

3. The operating state of the ultrafiltration device is 3 working and one standby, resulting in frequent start and stop of the ultrafiltration water pump, which affects the stable operation of the ultrafiltration device;

4. The maximum output of the ultrafiltration backwash pump is 220-240m ³ /h, and the capacity is insufficient, resulting in a short interval of chemical cleaning of the ultrafiltration device, only about 7 days.

Contents of the invention

The purpose of the present invention is to provide a steelmaking desalination station ultrafiltration device backwashing system that can replace ultrafiltration product water with reverse osmosis concentrated water, reduce self-consumption and fresh water in the backwashing process, and prolong the operating life of the ultrafiltration device and methods.

For this reason, the solution that the present invention takes is:

A backwashing system for an ultrafiltration device of a steelmaking desalination station, comprising a concentrated water tank and an ultrafiltration backwashing fine filter connected to the ultrafiltration device, characterized in that the concentrated water tank and the ultrafiltration backwashing fine filter are connected through a concentrated water pipe, There are two electric valves on the concentrated water pipe, and a concentrated water pump is installed between the two electric valves. Both the concentrated water pump and the electric valve are connected with the control computer.

The maximum output of the concentrated water pump is 330-340m ³ /h.

A method for backwashing an ultrafiltration device in a steelmaking desalinated water station, characterized in that:

(1) Concentrated reverse osmosis water with a backwash medium conductivity of 600-700 μs/cm in the ultrafiltration device;

(2) Compile the backwashing program of the control computer, set the operation and backwashing cycle of the ultrafiltration device as 40-45 minutes per operation, and 2.5-3 minutes for backwashing.

Compared with prior art, the beneficial effect of the present invention is:

1. The cleaning cycle and operation cycle of the ultrafiltration device are significantly extended, the utilization rate is improved, and the water quality of the operating water is stable;

2. The present invention can reduce the number of backwash times from 39 times to 29 times per 24 hours of continuous operation of a single set of ultrafiltration devices, thereby greatly reducing the power consumption of the backwash pump;

3. Using concentrated reverse osmosis water instead of ultrafiltration product water as the backwash medium can reduce the consumption of new water by more than 500 tons per day;

4. It can effectively reduce the running time of the concentrated water pump, extend the service life of the concentrated water pump, reduce maintenance costs, and ensure the stable operation of the ultrafiltration device.

Description of drawings

Figure 1 is a schematic diagram of the backwashing system of an ultrafiltration device.

In the figure: concentrated water tank 1, concentrated water pipe 2, electric valve 3, concentrated water pump 4, ultrafiltration backwash fine filter 5, ultrafiltration device 6.

detailed description

It can be seen from Fig. 1 that the backwashing system of the ultrafiltration device of the steelmaking desalinated water station of the present invention is composed of a concentrated water tank 1, a concentrated water pipe 2, a concentrated water pump 4, an ultrafiltration backwash fine filter 5, an ultrafiltration device 6 and 3 electric valves Composed of 3. Concentrated water tank 1 is connected to ultrafiltration backwash fine filter 5 through concentrated water pipe 2. Two electric valves 3 are installed on concentrated water pipe 2. The concentrated water pipe 2 between the two electric valves 2 is equipped with a maximum output of 330-340m ³ /h Concentrated water pump 4, ultrafiltration backwash fine filter 5 are connected with ultrafiltration device 6 through another electric valve 3 and connecting pipe, concentrated water pump 4 and three electric valves 3 are all connected with external control computer.

The method for backwashing the ultrafiltration device of the steelmaking desalinated water station of the present invention, one is to change the backwash water, and replace the original ultrafiltration product water with the reverse osmosis concentrated water with a conductivity of 600-700 μs/cm, as the backwash of the ultrafiltration device Wash medium.

The second is to compile the control computer backwashing program, and change the operation and backwashing cycle of the ultrafiltration device from the original setting of 30 minutes for each operation and 3 minutes for backwashing to 40 to 45 minutes for each operation and 2.5 to 3 minutes for backwashing.

The backwashing system of the ultrafiltration device of the present invention can be applied not only to newly-built desalinated water stations, but also to the transformation of existing steelmaking desalted water stations. It only needs to add a concentrated water pipe 2, an electric valve 3 and a concentrated water pump 4, and connect the concentrated water tank 1 and The ultrafiltration backwash fine filter 5 can be connected, and the original ultrafiltration water production tank, ultrafiltration water pump and pipeline can be kept as an emergency backup system.

Claims (3)

1. a steel-making desalted water station ultrafiltration apparatus backwashing system, including dense water tank and connect the super of ultrafiltration apparatus Filter backwash fine filter, it is characterised in that be connected by dense water pipe between dense water tank with hyperfiltration reverse-rinsing fine filter, Dense water pipe is provided with two electrodynamic valves, equipped with dense water pump between two electrodynamic valves, dense water pump and electrodynamic valve all with Control computer to be connected.

Steel-making desalted water station ultrafiltration apparatus backwashing system the most according to claim 1, it is characterised in that Described dense water pump EIAJ is 330～340m³/h。

3. applying a method for steel-making desalted water station ultrafiltration apparatus backwashing system described in claim 1, it is special Levy and be:

(1) reverse osmosis concentrated water that ultrafiltration apparatus backwash medium uses electrical conductivity to be 600～700 μ s/cm；

(2) establishment controls computer backwash procedure, runs with backwash cycle set ultrafiltration apparatus for often to run 40～45min, backwash 2.5～3min.