Anti-scaling device of shale gas produced water evaporative crystallization system

Abstract

The invention belongs to the technical field of shale gas exploitation, and particularly relates to an anti-scaling device of a shale gas produced water evaporative crystallization system, which comprises a hydrochloric acid tank made of glass fiber reinforced plastics, an acid inlet and a water injection port are arranged above the hydrochloric acid tank, and an acid outlet is arranged below the hydrochloric acid tank; a mixing cavity located below the acid inlet and the water injection opening is formed in the hydrochloric acid tank, the height of the mixing cavity is 1 / 3 of that of the hydrochloric acid tank body, a stirring paddle is arranged on the side wall of the mixing cavity, a rotating shaft of the stirring paddle is horizontally installed on the side wall of the mixing cavity, and blades of the stirring paddle directly face the acid inlet and the water injection opening. According to the scheme, the evaporation crystallization system can be effectively prevented from scaling in the process of treating shale gas produced water, and the service life of the evaporation crystallization system is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of shale gas exploitation, and in particular relates to an anti-scaling device for a shale gas produced water evaporation and crystallization system. Background Art

[0002] After running for a period of time, the evaporation and crystallization system of the water treatment station often faces a serious problem: various scaling substances including carbonates, sulfates, metal oxides, etc. will gradually form in the forced evaporator, falling film evaporator, forced circulation pump and the entire system process. The accumulation of these scaling substances not only significantly reduces the heat transfer efficiency of the forced evaporator and falling film evaporator, but also often leads to blockage of the entire process pipeline, seriously affecting the stability and production efficiency of the system.

[0003] In order to solve this problem, the industry has been exploring effective solutions. Traditional cleaning methods often need to be carried out under shutdown conditions and require the introduction of additional cleaning equipment, which not only increases production costs but also affects production continuity. Therefore, it is particularly important to develop a technology that can remove these scales online, efficiently and economically. Summary of the invention

[0004] The present invention provides an anti-scaling device for a shale gas produced water evaporation crystallization system capable of cleaning scale deposits online.

[0005] The invention discloses an anti-scaling device for a shale gas produced water evaporation crystallization system, which is connected to the evaporation crystallization system and comprises a hydrochloric acid tank made of glass fiber reinforced plastics, wherein an acid inlet and a water injection port are arranged on the top of the hydrochloric acid tank, and an acid outlet is arranged on the bottom; a mixing chamber located below the acid inlet and the water injection port is arranged inside the hydrochloric acid tank, the height of the mixing chamber is 1 / 3 of the hydrochloric acid tank body, a stirring paddle is arranged on the side wall of the mixing chamber, a rotating shaft of the stirring paddle is horizontally installed on the side wall of the mixing chamber, and a blade of the stirring paddle is directly opposite to the acid inlet and the water injection port.

[0006] Beneficial effects: The present invention sets a mixing chamber with a height of 1 / 3 of the hydrochloric acid tank body, so that the hydrochloric acid and water are first fully mixed and diluted in the mixing chamber. Since a stirring paddle is provided in the mixing chamber, the falling liquid hits the stirring paddle to stir the mixed liquid in the mixing chamber, thereby accelerating the dilution of the hydrochloric acid and improving the preparation efficiency and quality of the anti-scaling solution; and then enters the evaporation crystallization system through the acid outlet to realize online cleaning of scaling materials, effectively preventing the evaporation crystallization system from scaling in the process of treating shale gas produced water, and extending the service life of the evaporation crystallization system.

[0007] Furthermore, the mixing chamber is enclosed by a first baffle, a second baffle and a side wall of the mixing chamber, and the first baffle and the second baffle are connected to each other at an angle of 90°. The 90° angle design between the first baffle and the second baffle further optimizes the flow path of the fluid in the mixing chamber, enhances the turbulent effect of the fluid, promotes the full mixing of hydrochloric acid and water, and improves the mixing efficiency and uniformity.

[0008] Furthermore, the acid inlet is connected to a hydrochloric acid feed pipe, on which an acid inlet metering pump is installed; and the water injection port is connected to a water pipe. The configuration of the acid inlet metering pump and the water pipe realizes the precise metering and supply of hydrochloric acid and water, ensures the accuracy of the mixing ratio, and provides basic conditions for preparing an efficient anti-scaling solution.

[0009] Furthermore, the acid outlet is externally connected to a pickling pump, and the outlet end of the pickling pump is connected to the water inlet pipe of the evaporation crystallization system. The mixed anti-scaling solution is directly pumped to the water inlet pipe of the evaporation crystallization system by the pickling pump, thereby realizing the instant application of the anti-scaling solution, simplifying the operation process, and improving the automation level and anti-scaling treatment efficiency of the entire evaporation crystallization system. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a structural diagram of an anti-scaling device for evaporation and crystallization system of shale gas produced water according to the present invention;

[0011] Figure numerals: hydrochloric acid tank 1, acid inlet 2, water injection port 3, acid outlet 4, first baffle 5, second baffle 6, mixing chamber 7, stirring paddle 8. DETAILED DESCRIPTION

[0012] like Figure 1 As shown, a scaling prevention device for a shale gas produced water evaporation and crystallization system comprises a cylindrical hydrochloric acid tank 1, an acid inlet 2 and a water injection port 3 are provided on the upper part of the tank body of the hydrochloric acid tank 1, the acid inlet 2 is connected to a hydrochloric acid feed pipe, an acid feed metering pump is installed on the hydrochloric acid feed pipe; the water injection port 3 is connected to a water pipe.

[0013] The lower end of the hydrochloric acid tank 1 is provided with an acid outlet 4, which is externally connected to an inlet pipeline of a pickling pump. A pickling pump is installed on the inlet pipeline of the pickling pump, and a PVC butterfly valve is added to the pump outlet to connect to the water inlet pipe of the evaporation crystallization system.

[0014] The hydrochloric acid tank 1 is made of glass fiber reinforced plastic material, and the bottom of the tank is integrally formed with a first baffle 5 and a second baffle 6. The height of the first baffle 5 and the second baffle 6 is located at 1 / 3 of the height of the tank body. One side wall of the first baffle 5 and the second baffle 6 are connected to the inner wall of the hydrochloric acid tank 1, and the other side walls of the first baffle 5 and the second baffle 6 are connected to each other. The first baffle 5 and the second baffle 6 are connected to each other at an angle of 90° to jointly enclose a mixing chamber 7. The mixing chamber 7 is located directly below the acid inlet 2 and the water injection port 3, and the above-mentioned acid outlet 4 is located outside the mixing chamber 7.

[0015] A stirring paddle 8 is installed on the side wall of the mixing chamber 7. The rotating shaft of the stirring paddle 8 is horizontally fixed on the side. The highest position of the stirring paddle 8 during rotation is higher than the mixing chamber 7. The stirring paddle 8 is facing the acid inlet 2 and the water injection port 3.

[0016] When the present invention is used, hydrochloric acid and clean water are respectively injected into the mixing chamber 7 from the acid inlet 2 and the water injection port 3 for blending and dilution. During the process, the falling liquid hits the stirring paddle 8 to stir the mixed liquid in the mixing chamber 7, thereby accelerating the dilution of the hydrochloric acid. When the liquid capacity in the mixing chamber 7 is higher than the baffle, the diluted hydrochloric acid overflows from the baffle to the non-mixing chamber 7 area of ​​the hydrochloric acid tank 1, and is then pumped into the evaporation crystallization system from the acid outlet 4 for acid washing.

[0017] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by the present invention shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An anti-scaling device for evaporation and crystallization system of shale gas produced water, connected to the evaporation and crystallization system, characterized in that: The invention comprises a hydrochloric acid tank made of glass fiber reinforced plastics, wherein an acid inlet and a water injection port are arranged on the top of the hydrochloric acid tank, and an acid outlet is arranged on the bottom; a mixing chamber located below the acid inlet and the water injection port is arranged inside the hydrochloric acid tank, and the height of the mixing chamber is 1 / 3 of the hydrochloric acid tank body; a stirring paddle is arranged on the side wall of the mixing chamber, and the rotating shaft of the stirring paddle is horizontally installed on the side wall of the mixing chamber, and the blades of the stirring paddle are directly opposite to the acid inlet and the water injection port.

2. According to claim 2, a shale gas produced water evaporation crystallization system anti-scaling device is characterized by: The mixing chamber is surrounded by a first baffle, a second baffle and a mixing chamber side wall.

3. According to claim 3, a shale gas produced water evaporation crystallization system anti-scaling device is characterized by: The first baffle plate and the second baffle plate are connected to each other at an angle of 90°.

4. According to claim 4, a shale gas produced water evaporation crystallization system anti-scaling device is characterized by: The acid inlet is connected to a hydrochloric acid feed pipe, on which an acid feed metering pump is installed; and the water injection port is connected to a water pipe.

5. According to claim 5, a scaling prevention device for evaporation and crystallization system of shale gas produced water is characterized by: The acid outlet is externally connected to a pickling pump, and the outlet end of the pickling pump is connected to the water inlet pipe of the evaporation crystallization system.

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