Silicon carbide ceramic membrane filtering device for saline water purification

Abstract

The utility model relates to a silicon carbide ceramic membrane filtering device for purifying saline water. The silicon carbide ceramic membrane filtering device comprises a stock solution pool for accommodating a stock solution to be treated, a feeding pump, a silicon carbide ceramic membrane component, a back-flushing pump and a water storage tank, the silicon carbide ceramic membrane assembly comprises a shell, a silicon carbide ceramic membrane is arranged in the shell, a water inlet is formed in the top of the shell in a communicating manner, and a purified water outlet is formed in the side wall of the shell in a connecting manner; the upper part of the stock solution pool is communicated with a drain outlet, the lower part of the stock solution pool is communicated with a feeding pump, an outlet of the feeding pump is connected with a water inlet, and a purified water outlet is respectively communicated with a backwashing pneumatic valve and a water storage tank; and a backwashing pump is also communicated between the backwashing pneumatic valve and the water storage tank. The device is high in purification efficiency and suitable for large-scale production and use.

Description

Technical Field

[0001] The utility model relates to the technical field of filtration, in particular to a silicon carbide ceramic membrane filtration device for brine purification. Background Technique

[0002] In the salt-making industry, brine contains a large amount of Ca 2+ , Mg 2+ inorganic salts, as well as natural organic matters and particulate impurities. These impurities will be brought into the brine system during salt-making. If not removed, they will reduce the quality of salt and even increase the energy consumption of the evaporation process. Therefore, sodium hydroxide and sodium carbonate are generally added to the brine to react with Ca 2+ , Mg 2+ in the raw brine to form insoluble substances CaCO 3 and Mg(OH) 2 . After 16 - 20 hours of precipitation, the supernatant is the refined brine. This process is simple and easy to operate, but the precipitation time is long, a sufficient buffer tank is required, the floor area is large, and the organic matters and particulate matters in the brine are not fully filtered, resulting in low brine quality and difficulty in meeting the requirements for producing high-quality products.

[0003] Therefore, it is necessary to develop a filtration brine purification equipment to improve the working efficiency and product quality of refined brine. Content of the Utility Model

[0004] The purpose of the utility model is to provide a silicon carbide ceramic membrane filtration device for brine purification, which can remove impurities in brine on a large scale and efficiently, and improve the brine quality.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A silicon carbide ceramic membrane filtration device for brine purification, comprising a raw liquid tank for containing the raw liquid to be treated, a feed pump, a silicon carbide ceramic membrane module, a backwash pump and a water storage tank; the silicon carbide ceramic membrane module includes a housing, and a silicon carbide ceramic membrane is arranged inside the housing. An inlet is communicated and arranged at the top of the housing, a purified water outlet is connected and arranged on the side wall of the housing, and a sewage outlet is arranged at the bottom of the housing; the sewage outlet is communicated above the raw liquid tank, the raw liquid tank is communicated with the feed pump below, the outlet of the feed pump is connected to the inlet, and an inlet regulating valve, an inlet pneumatic valve and an inlet pressure gauge are sequentially communicated between the silicon carbide ceramic membrane module and the feed pump; a concentrated water pneumatic valve, a concentrated water flowmeter and a concentrated water regulating valve are arranged between the sewage outlet and the pipeline communicating with the raw liquid tank; the purified water outlet is respectively communicated with a backwash pneumatic valve and the water storage tank; a water filling pneumatic valve and a water filling pressure gauge are communicated between the pipeline connecting the purified water outlet and the water storage tank; a water outlet is arranged on the right side wall of the water storage tank and communicated with the product water outlet, and a product water pneumatic valve, a product water flowmeter and a product water regulating valve are sequentially communicated between the pipeline connecting the water storage tank and the product water outlet; a backwash pump is also communicated between the backwash pneumatic valve and the water storage tank.

[0007] In the above-mentioned silicon carbide ceramic membrane filtration device for brine purification, the silicon carbide ceramic membrane module includes a first silicon carbide ceramic membrane module and a second silicon carbide ceramic membrane module; the backwash pneumatic valve includes a first backwash pneumatic valve and a second backwash pneumatic valve; the sewage discharge port of the first silicon carbide ceramic membrane module is communicated above the raw liquid tank; the outlet end of the feed pump is connected to the inlet at the top of the first silicon carbide ceramic membrane module, the outlet of the first silicon carbide ceramic membrane module is communicated with the inlet of the second silicon carbide ceramic membrane module, a middle water pressure gauge and a middle water pneumatic valve are sequentially communicated between the outlet of the first silicon carbide ceramic membrane module and the second silicon carbide ceramic membrane module, and the bottom inlet of the water storage tank is communicated with the second silicon carbide ceramic membrane module; the sewage outlet of the second silicon carbide ceramic membrane module is sequentially communicated with a sewage pneumatic valve and a sewage discharge port; the water pumping ports on the left side wall of the water storage tank are communicated with the outlets of the first silicon carbide ceramic membrane module and the second silicon carbide ceramic membrane module; a first backwash pneumatic valve and a second backwash pneumatic valve are respectively arranged between the water storage tank and the first silicon carbide ceramic membrane module and the second silicon carbide ceramic membrane module.

[0008] In the above-mentioned silicon carbide ceramic membrane filtration device for brine purification, an inlet thermometer is further arranged between the inlet pneumatic valve and the inlet pressure gauge, and the inlet thermometer is used for measuring and displaying the inlet temperature.

[0009] In the above-mentioned silicon carbide ceramic membrane filtration device for brine purification, a fixing frame is installed outside the housing, and the fixing frame includes a clamp and a support seat. The clamp is fixedly sleeved on the outer peripheral side of the housing, and the support seat is fixedly arranged at the bottom of the clamp.

[0010] In the above-mentioned silicon carbide ceramic membrane filtration device for brine purification, the water storage tank is provided with a liquid level gauge for observing the water storage volume; an installation bracket is fixedly arranged at the bottom of the water storage tank.

[0011] In the above-mentioned silicon carbide ceramic membrane filtration device for brine purification, the head of the feed pump is 10 - 40 m, and the constant water production flow rate of the water production regulating valve is 100 m 3 / h.

[0012] In the above-mentioned silicon carbide ceramic membrane filtration device for brine purification, the pore diameters of the silicon carbide ceramic membranes are all 100 nm, and the total area of the silicon carbide ceramic membranes is all 300 ㎡.

[0013] In the above-mentioned silicon carbide ceramic membrane filtration device for brine purification, the pressure of the first silicon carbide ceramic membrane module is 0.2 - 2 bar. When the pressure difference between the inlet water pressure gauge and the intermediate water pressure gauge is greater than 1 bar, the first silicon carbide ceramic membrane module needs to be backwashed; when the pressure difference between the intermediate water pressure gauge and the water production pressure gauge is greater than 1 bar, the second silicon carbide ceramic membrane module needs to be backwashed.

[0014] The beneficial effects of the present utility model are:

[0015] The present utility model combines cross-flow filtration and dead-end filtration. Cross-flow filtration is adopted at the front end, mainly to remove organic matter and colloid in the brine, which can avoid excessive blockage of the membrane pores by organic matter and colloid in the brine. Dead-end filtration is adopted at the back end to further rapidly purify the brine. A structure of upper inlet, side outlet and bottom sewage discharge is formed on the outer shell of the silicon carbide ceramic membrane module. The present utility model has high purification efficiency and is suitable for large-scale production use. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the on-line brine purification equipment provided by the embodiment of the present application;

[0017] Figure 2 is a schematic structural diagram of the raw liquid tank provided by the embodiment of the present application;

[0018] Figure 3 is a schematic structural diagram of the water storage tank provided by the embodiment of the present application.

[0019] In the figure: 1 - stock solution tank; 2 - feed pump; 3 - inlet water regulating valve; 4 - inlet water pneumatic valve; 5 - inlet water thermometer; 6 - inlet water pressure gauge; 701 - first backwash pneumatic valve; 702 - second backwash pneumatic valve; 801 - first silicon carbide ceramic membrane module; 802 - second silicon carbide ceramic membrane module; 811 - water inlet; 812 - clean water outlet; 813 - sewage outlet; 82 - fixing rack; 821 - clamp; 822 - support seat; 9 - concentrated water pneumatic valve; 10 - concentrated water flowmeter; 11 - concentrated water regulating valve; 12 - intermediate water pressure gauge; 13 - intermediate water pneumatic valve; 14 - sewage pneumatic valve; 15 - sewage discharge port; 16 - filling water pressure gauge; 17 - filling water pneumatic valve; 18 - backwash pump; 19 - water storage tank; 191 - liquid level gauge; 192 - mounting bracket; 20 - product water pneumatic valve; 21 - product water flowmeter; 22 - product water regulating valve; 23 - product water outlet. Detailed implementation mode

[0020] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0021] Reference Figures 1 to 3, a silicon carbide ceramic membrane filtration device for brine purification according to the present utility model, includes a raw liquid tank 1; a feed pump 2; a silicon carbide ceramic membrane module; a water storage tank 19. The inlet end of the feed pump is connected to the raw liquid tank 1, and the outlet end of the feed pump 2 is connected to the top of the first silicon carbide ceramic membrane module 801. An inlet regulating valve 3, an inlet pneumatic valve 4, an inlet temperature gauge 5, an inlet pressure gauge 6 and a first backwashing pneumatic valve 701 are sequentially installed between the communication pipeline of the first silicon carbide ceramic membrane module 801 and the feed pump 2. Optionally, the head of the feed pump 2 is 10 - 40m, and the pressure of the raw water after being pressurized by the feed pump 2 entering the first silicon carbide ceramic membrane module 801 is 0.2 - 2 bar, and the pressure is displayed by the inlet pressure gauge 6. The water outlet on the side wall of the first silicon carbide ceramic membrane module 801 is connected to the water inlet at the top of the second silicon carbide ceramic membrane module 802. Specifically, both the first silicon carbide ceramic membrane module 801 and the second silicon carbide ceramic membrane module 802 are provided with ten groups, and the pore diameter of the used silicon carbide ceramic membranes is 100 nm, and the total area of the silicon carbide ceramic membranes is 300 ㎡. An intermediate water pressure gauge 12 and an intermediate water pneumatic valve 13 are sequentially arranged between the water outlet of the first silicon carbide ceramic membrane module 801 and the pipeline connecting to the second silicon carbide ceramic membrane module 802. The water outlet end on the side wall of the second silicon carbide ceramic membrane module 802 is connected to the inlet end of the water storage tank 19. A water filling pneumatic valve 17 and a water filling pressure gauge 16 are installed between the communication pipeline of the second silicon carbide ceramic membrane module 802 and the water storage tank 19. A sewage discharge port is connected to the bottom of the second silicon carbide ceramic membrane module 802. A sewage pneumatic valve 14 is arranged between the communication pipeline of the second silicon carbide ceramic membrane module 802 and the sewage discharge port 15. The sewage discharge port at the bottom of the first silicon carbide ceramic membrane module 801 is connected to the raw liquid tank 1. A concentrated water pneumatic valve 9, a concentrated water flowmeter 10 and a concentrated water regulating valve 11 are arranged between the communication pipeline of the first silicon carbide ceramic membrane module 801 and the raw liquid tank 1. The raw liquid to be treated flows from the raw liquid tank 1 into the feed pump 2 and is pressurized and then enters the first silicon carbide ceramic membrane module 801 and the second silicon carbide ceramic membrane module 802 in sequence. The raw liquid is filtered and purified by the silicon carbide ceramic membrane module, and the filtered and purified coolant is output through the water production port 23. The water production flow rate is kept constant at 100m 3 / h, and the flow rate is displayed by the water production flowmeter 21.

[0022] In this embodiment, the inlet end of the water storage tank 19 is connected to the water outlet end on the side wall of the second silicon carbide ceramic membrane module 802, and a water filling pneumatic valve 17 and a water filling pressure gauge 16 are installed between the communication pipeline of the water storage tank 19 and the second silicon carbide ceramic membrane module 802. During the water production process, the intermediate water pneumatic valve 13 and the water filling pneumatic valve 17 are opened, and the purified water flows into the water storage tank 19 through the communication pipeline.

[0023] Working principle of the utility model: First, check that all valves in the system are in the closed state. Open the inlet regulating valve 3, inlet pneumatic valve 4, intermediate water pneumatic valve 13, water filling pneumatic valve 17, product water pneumatic valve 20, product water regulating valve 22, concentrated water pneumatic valve 9 and concentrated water regulating valve 11. The raw liquid to be treated flows through the outlet of the raw liquid tank 1 into the feeding pump 2, and after the pressure is increased, it enters the first silicon carbide ceramic membrane module 801 and the second silicon carbide ceramic membrane module 802 in sequence. The raw liquid is filtered and purified by the silicon carbide ceramic membrane module. The filtered and purified brine is output through the product water outlet 23, and the system product water pressure is adjusted by the product water regulating valve 22. After the silicon carbide ceramic membrane is contaminated, the operating frequency of the feeding pump 2 is increased to increase the membrane pressure, so as to stabilize the product water pressure and flow rate in sequence. When the pollutants accumulate to a certain amount on the filtration surface of the silicon carbide ceramic membrane and the pressure difference between the inlet water pressure gauge 6 and the intermediate water pressure gauge 12 is greater than 1 bar, the first silicon carbide ceramic membrane module 801 needs to be backwashed. At this time, the feeding pump 2 and all pneumatic valves are closed, the backwashing pump 18 and the first backwashing pneumatic valve 701 are opened, and the concentrated water pneumatic valve 9 is opened. The backwashing pump operates to pump out the backwashing water stored in the liquid storage tank 19 and increase the pressure, and then inject it into the first silicon carbide ceramic membrane module 801 to backwash the membrane. The generated sewage is discharged through the concentrated water pneumatic valve. When the pressure difference between the intermediate water pressure gauge and the product water pressure gauge is greater than 1 bar, the second silicon carbide ceramic membrane module 802 needs to be backwashed. At this time, the feeding pump 2 and all pneumatic valves are closed, the backwashing pump 18, the second backwashing pneumatic valve 702 and the sewage pneumatic valve 14 are opened. The backwashing pump operates to pump out the backwashing water stored in the liquid storage tank 19 and increase the pressure, and then inject it into the second silicon carbide ceramic membrane module 802 to backwash the membrane. The generated sewage is discharged through the sewage pneumatic valve.

[0024] In specific settings, the silicon carbide ceramic membrane module includes a housing 81 and a silicon carbide ceramic membrane inside the housing 81. The top of the housing 81 is connected and provided with a water inlet 811, the side wall of the housing 81 is connected and provided with a purified water outlet, and the bottom of the housing 81 is connected and provided with a sewage outlet 813. Thus, a structure of upper inlet, side product and bottom sewage discharge is formed on the housing 81 of the silicon carbide ceramic membrane module. A fixing frame 82 is installed outside the housing 81. The fixing frame 82 includes a clamp 821 and a support seat 822. The clamp 821 is fixedly sleeved on the outer peripheral side of the housing 81, and the support seat 822 is fixedly arranged at the bottom of the clamp 821. The housing 81 is installed and fixed through the clamp 821 and the support seat 822, so that the silicon carbide ceramic membrane module operates stably.

[0025] In this embodiment, a liquid level gauge 191 is embedded on the outer peripheral wall of the front of the water storage tank 19. The position of the liquid level gauge is convenient for observing the water volume in the water storage tank 19, so as to replenish water in time. An installation bracket 192 is fixedly arranged at the bottom of the water storage tank.

[0026] In some specific embodiments, a water inlet thermometer 5 is further installed between the communication pipeline of the water inlet pneumatic valve 4 and the water inlet pressure gauge 6, and the water inlet thermometer 5 is used to measure and display the water inlet temperature.

[0027] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A silicon carbide ceramic membrane filtration device for salt water purification, characterized in that: The invention comprises a raw liquid pool (1) for containing raw liquid to be treated, a feed pump (2), a silicon carbide ceramic membrane assembly, a backwash pump (18) and a water storage tank (19); the silicon carbide ceramic membrane assembly comprises a shell (81), a silicon carbide ceramic membrane is arranged inside the shell (81), a water inlet (811) is connected to the top of the shell (81), a clean water outlet (812) is connected to the side wall of the shell, and a sewage outlet (813) is arranged at the bottom of the shell; the raw liquid pool (1) is connected to the sewage outlet (813) at the top, the raw liquid pool (1) is connected to the feed pump (2) at the bottom, the outlet of the feed pump (2) is connected to the water inlet (811), and a water inlet regulating valve (3), a water inlet pneumatic valve (4) and a water inlet regulating valve (5) are connected in sequence between the silicon carbide ceramic membrane assembly and the feed pump (2). A water inlet pressure gauge (6); a concentrated water pneumatic valve (9), a concentrated water flow meter (10) and a concentrated water regulating valve (11) are arranged between the sewage outlet (813) and the raw liquid pool (1); the clean water outlet (812) is respectively connected to a backwashing pneumatic valve and a water storage tank (19); a water filling pneumatic valve (17) and a water filling pressure gauge (16) are connected between the clean water outlet (812) and the water storage tank (19) connecting pipeline; a water outlet is arranged on the right side wall of the water storage tank (19) and is connected to a produced water outlet (23); a produced water pneumatic valve (20), a produced water flow meter (21) and a produced water regulating valve (22) are sequentially connected between the water storage tank (19) and the produced water outlet (23) connecting pipeline; a backwashing pump (18) is also connected between the backwashing pneumatic valve and the water storage tank (19).

2. The silicon carbide ceramic membrane filtration device for salt water purification according to claim 1, characterized in that: The silicon carbide ceramic membrane assembly comprises a first silicon carbide ceramic membrane assembly (801) and a second silicon carbide ceramic membrane assembly (802); the backwashing pneumatic valve comprises a first backwashing pneumatic valve (701) and a second backwashing pneumatic valve (702); the upper part of the stock liquid pool (1) is connected to a sewage discharge port of the first silicon carbide ceramic membrane assembly (801); the outlet end of the feed pump (2) is connected to the top water inlet of the first silicon carbide ceramic membrane assembly (801), the outlet of the first silicon carbide ceramic membrane assembly (801) is connected to the water inlet of the second silicon carbide ceramic membrane assembly (802), and the outlet of the first silicon carbide ceramic membrane assembly (801) is connected to the water inlet of the second silicon carbide ceramic membrane assembly (802) in sequence, and the outlet of the first silicon carbide ceramic membrane assembly (801) is connected to the second silicon carbide ceramic membrane assembly (802) in sequence, and the outlet of the first silicon carbide ceramic membrane assembly (801) is connected to the intermediate A water pressure gauge (12) and an intermediate water pneumatic valve (13); the second silicon carbide ceramic membrane assembly (802) is connected to the water inlet at the bottom of the water storage tank (19); the sewage outlet of the second silicon carbide ceramic membrane assembly (802) is connected to the sewage pneumatic valve (14) and the sewage outlet (15) in sequence; the water suction port on the left side wall of the water storage tank (19) is connected to the water outlet of the first silicon carbide ceramic membrane assembly (801) and the water outlet of the second silicon carbide ceramic membrane assembly (802); a first backwashing pneumatic valve (701) and a second backwashing pneumatic valve (702) are respectively arranged between the water storage tank (19) and the first silicon carbide ceramic membrane assembly (801) and the second silicon carbide ceramic membrane assembly (802).

3. The silicon carbide ceramic membrane filtration device for salt water purification according to claim 1, characterized in that: The feed pump (2) has a head of 10-40m, and the water production regulating valve (22) has a constant water production flow of 100m 3 / h.

4. The silicon carbide ceramic membrane filtration device for salt water purification according to claim 1, characterized in that: The pore size of silicon carbide ceramic membrane is 100nm, and the total silicon carbide ceramic membrane area is 300m 2 .

5. The silicon carbide ceramic membrane filtration device for salt water purification according to claim 2, characterized in that: The pressure of the first silicon carbide ceramic membrane assembly (801) is 0.2-2bar. When the pressure difference between the inlet water pressure gauge and the intermediate water pressure gauge is greater than 1bar, the first silicon carbide ceramic membrane assembly (801) needs to be backwashed; when the pressure difference between the intermediate water pressure gauge and the produced water pressure gauge is greater than 1bar, the second silicon carbide ceramic membrane assembly (802) needs to be backwashed.

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