Automatic salt discharging device of shale gas produced water evaporation crystallization system

Abstract

The present application relates to the technical field of shale gas exploitation, and discloses an automatic salt discharging device of a shale gas production water evaporation crystallization system, which comprises a falling film evaporator and an outlet pipeline, and further comprises: a brine mixing pipeline used for introducing brine into the outlet pipeline and flushing the outlet pipeline, the brine mixing pipeline being connected to the outlet pipeline; a brine supply device; the brine supply device being connected to the brine mixing pipeline; a brine mixing control valve used for controlling the inflow and stop of brine into the outlet pipeline; an outlet control valve used for controlling the outflow and stop of crystallized salt in the outlet pipeline; and a control system used for receiving signals of the outlet control valve and the brine mixing control valve and controlling the opening and closing of the outlet control valve and the brine mixing control valve. The present application can solve the problem that the outlet pipeline is prone to blockage, and improve the evaporation crystallization effect and processing efficiency of the system on wastewater.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shale gas exploitation, and particularly relates to an automatic salt discharging device of a shale gas produced water evaporation crystallization system. BACKGROUND

[0002] Shale gas is a gaseous fossil fuel. In the process of shale gas exploitation, some industrial wastewater, such as fracturing flowback fluid or drilling wastewater, is produced. These wastewaters usually contain high concentrations of salts, organic matter, heavy metals, and suspended solids, and thus need to be treated to prevent secondary pollution.

[0003] In water treatment, a falling film evaporator is usually used for evaporation crystallization treatment. The principle is that the wastewater forms a thin film on the inner wall of the heating pipe of the falling film evaporator and flows down along the pipe wall, so that heat energy can be efficiently utilized for evaporation, thereby improving the wastewater treatment efficiency. The wastewater treated by the falling film evaporator can be further treated by crystallization, drying, and the like, so as to obtain valuable salts or other compounds. These compounds can be reused as industrial raw materials, realizing the resource utilization of wastewater.

[0004] However, in actual application, since such a liquid contains a large amount of inorganic salts, these salts are very easy to form crystals on the wall of the crystalline salt outlet pipeline of the falling film evaporator after supersaturation, thereby causing the outlet pipeline to be blocked, which damages the evaporation crystallization effect and treatment efficiency of the system. In order to avoid pipeline blockage, manual 24-hour observation is currently performed at the crystalline salt outlet, and when the salt discharge is abnormal, it can be inferred that the pipeline is blocked, so that manual control and adjustment intervention are performed on the system to ensure the normal operation of the system. However, this manual observation and control and adjustment mode consumes a lot of human resources and seriously affects the efficient operation of the enterprise. SUMMARY

[0005] The present application aims to provide an automatic salt discharging device of a shale gas produced water evaporation crystallization system to solve the problem of easy blockage of the outlet pipeline and improve the evaporation crystallization effect and treatment efficiency of the system on wastewater.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: an automatic salt discharging device of a shale gas produced water evaporation crystallization system, comprising a falling film evaporator and an outlet pipeline connected with the outlet of the falling film evaporator, and further comprising:

[0007] A brine mixing pipeline is used to introduce brine into the outlet pipeline and flush the outlet pipeline, and the brine mixing pipeline is connected to the outlet pipeline.

[0008] A brine supply device is used to supply brine for flushing the outlet pipeline to the brine mixing pipeline, and the brine supply device is connected to the brine mixing pipeline.

[0009] Brine control valve, the brine control valve is used for controlling the inflow and stop of brine into the outlet pipeline; the brine control valve is arranged on the brine pipeline and located between the brine supply device and the outlet pipeline;

[0010] Outlet control valve, the outlet control valve is used for controlling the outflow and stop of crystallized salt in the outlet pipeline, and the outlet control valve is arranged at the end of the outlet pipeline; the connection part between the brine pipeline and the outlet pipeline is located between the falling film evaporator and the outlet control valve;

[0011] Control system, the control system is connected with the brine control valve and the outlet control valve at the same time, and the control system is used for receiving signals of the outlet control valve and the brine control valve and controlling the opening and closing of the outlet control valve and the brine control valve.

[0012] The principle and advantages of the scheme are that: in the scheme, the brine pipeline, the brine supply device and the brine control valve are arranged, the brine flushing mechanism is introduced into the outlet pipeline, in actual application, the brine generally has high concentration, because the brine has high salt concentration and dissolving capacity, the crystallized salt on the pipe wall can be effectively dissolved and flushed, so that the problem of blockage caused by crystallization in the outlet pipeline is prevented. At the same time, the control system automatically controls the brine control valve and the outlet control valve, so as to realize the accurate adjustment of the brine flushing and salt discharging process. When the outlet pipeline is blocked to a certain extent and affects the salt discharging efficiency, the control system automatically opens the outlet control valve and adjusts the opening degree to ensure the appropriate salt discharging amount. If the salt discharging is suddenly stopped, it indicates that the outlet pipeline is blocked, at this time, the control system automatically opens the brine control valve to introduce the brine to flush the outlet pipeline.

[0013] The advantages of the scheme are that:

[0014] 1. High automation degree: through the automatic control system, the accurate control of the brine flushing and salt discharging process is realized, manual attendance and intervention are not needed, and the working efficiency is greatly improved.

[0015] 2. Good anti-blocking effect: the brine flushing mechanism can effectively dissolve and flush the crystallized salt on the pipe wall, prevent the blockage from occurring, and ensure the normal operation of the system.

[0016] 3. High salt discharging efficiency and good crystallization effect: through the automatic control of the outlet control valve, the continuous and stable discharge of the crystallized salt can be realized, so as to be beneficial to improve the evaporation and crystallization effect and treatment efficiency of the system on the wastewater.

[0017] 4. Reducing maintenance cost: because the need for manual attendance and intervention is reduced, the maintenance cost of the equipment is reduced, and the labor intensity of the workers is also reduced.

[0018] In summary, this solution effectively solves the problem of easy blockage in the outlet pipeline during the evaporation and crystallization process of shale gas production water by introducing a brine flushing mechanism and an automated control system, thereby improving system efficiency and crystallization effect and reducing maintenance costs.

[0019] Preferably, as an improvement, it also includes a purified water pipeline, which is used to introduce purified water into the outlet pipeline and flush the outlet pipeline. The purified water pipeline is connected to the outlet pipeline between the falling film evaporator and the outlet control valve.

[0020] A purified water supply device is used to supply purified water to the purified water pipeline for flushing the outlet pipeline. The purified water supply device is connected to the purified water pipeline.

[0021] A flushing control valve is used to control the inflow and stop the inflow of purified water into the outlet pipeline; the flushing control valve is located on the purified water pipeline and between the purified water supply device and the outlet pipeline;

[0022] The control system is also connected to the flushing control valve, and the control system is also used to receive signals from the flushing control valve and control the flushing control valve to open and close.

[0023] The above solution introduces a purified water flushing mechanism by adding purified water pipelines, purified water supply devices, and flushing control valves, giving the system dual flushing capabilities. In addition to the existing brine flushing, purified water serves as a gentler yet equally effective flushing medium, used periodically or as needed to flush the outlet pipeline, further reducing the accumulation of crystallized salts on the pipe walls and improving anti-clogging performance. The automated control system can monitor and adjust the flushing process in real time, ensuring that the flushing medium flows into the outlet pipeline under appropriate time and conditions. This intelligent control method improves the system's stability and reliability, reducing the risk of malfunctions and downtime due to human error.

[0024] Preferably, as an improvement, it also includes a weighing module for monitoring the weight of the crystallized salt discharged from the outlet pipeline; the control system is also connected to the weighing module and is used to receive signals from the weighing module and adjust the opening of the outlet control valve when the weight of the crystallized salt reaches a set threshold.

[0025] Through the above scheme, the weighing module can monitor the weight of the crystallized salt discharged from the outlet pipeline in real time, ensuring that the system can accurately control the salt output. When the weight of the crystallized salt reaches the set threshold, the control system will automatically adjust the opening of the outlet control valve, thereby avoiding blockages or resource waste caused by excessive or insufficient salt output. The integration of the weighing module and the control system enables the system to automatically monitor and adjust the salt output process without manual intervention. This greatly improves the automation level of the system, reduces errors and uncertainties caused by manual operation, and also reduces the labor intensity of the staff. Furthermore, through the real-time data provided by the weighing module, the system can more accurately understand the salt output situation during the production process, thereby understanding the pipeline blockage situation and optimizing the production process accordingly. For example, the treatment parameters of brine or purified water can be adjusted based on the crystallized salt output to improve the flushing efficiency and quality of the outlet pipeline.

[0026] Preferably, as an improvement, the control system is also used to open the brine mixing control valve when the weighing module detects that the weight of the crystallized salt discharged from the outlet pipeline does not change within a set time period threshold t1.

[0027] Using the above scheme, by setting a time period threshold t1, the control system can monitor the weight change of the crystallized salt in the outlet pipeline in real time. If the weight of the crystallized salt does not change within time t1, it means that the outlet pipeline is blocked. At this time, the control system automatically opens the brine mixing control valve, introduces brine to flush the outlet pipeline, thereby clearing the blockage in a timely manner and keeping the outlet pipeline unobstructed.

[0028] Preferably, as an improvement, the control system is also used to open the flushing control valve when the weighing module detects that the weight of the crystallized salt discharged from the outlet pipeline does not change within a set time period threshold t2.

[0029] By setting two different time period thresholds t1 and t2, corresponding to brine rinsing and purified water rinsing respectively, the system implements a multi-level anti-clogging strategy, which can more comprehensively deal with different types of clogging problems and improve the system's adaptability and reliability.

[0030] Preferably, as an improvement, the control system is also used to adjust the opening time and opening degree of the brine control valve and the flushing control valve when the weighing module detects that the flow rate of the mixture of crystallized salt and brine or the mixture of crystallized salt and purified water discharged from the outlet pipeline reaches V.

[0031] By implementing the above solution and monitoring the flow rate of the mixture in real time, the control system can precisely adjust the opening time and degree of the brine control valve and the flushing control valve, thereby achieving precise control of the flow rate of the mixture. This reduces the frequency and difficulty of manual intervention, avoids waste of raw materials, and improves resource utilization efficiency.

[0032] Preferably, as an improvement, the brine supply device includes a storage tank for storing brine and a pump for conveying the brine from the storage tank to the brine mixing pipeline.

[0033] The above solution allows the storage tank to hold a large amount of brine, ensuring a continuous and stable supply to the brine mixing pipeline when needed, thus meeting production requirements. A dedicated pumping system efficiently transports the brine from the storage tank to the mixing pipeline, reducing energy consumption and time costs during transport.

[0034] Preferably, as an improvement, the purified water supply device includes a water storage tank for storing purified water and a pump for conveying the purified water from the water storage tank to the purified water pipeline.

[0035] Through the above solution, the water storage tank can store enough purified water to ensure a continuous and stable supply to the purified water pipeline when needed, meeting the water demand in various application scenarios. The efficient operation of the pumping system enables purified water to be delivered quickly and accurately to designated locations, improving water use efficiency.

[0036] Preferably, as an improvement, the control system is a programmable logic controller system, which has the ability to receive input signals, process signals, and output control commands according to a preset program.

[0037] The above approach utilizes a programmable logic controller (PLC) system as the control system, which offers advantages such as high reliability and stability, high programmability, and flexibility. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0039] The following detailed description provides further details on specific embodiments, but the embodiments of the present invention are not limited thereto. Unless otherwise specified, the technical means used in the following embodiments are conventional means well known to those skilled in the art; the experimental methods used are all conventional methods; and the materials and reagents used are all commercially available.

[0040] The reference numerals in the accompanying drawings include: 1. Falling film evaporator; 2. Outlet pipeline; 3. Brine mixing pipeline; 4. Brine mixing control valve; 5. Outlet control valve; 6. Purified water pipeline; 7. Flushing control valve.

[0041] Example 1

[0042] An automatic salt extraction device for a shale gas production water evaporation and crystallization system, such as Figure 1 As shown, it includes a falling film evaporator 1 and an outlet pipeline 2 connected to the outlet of the falling film evaporator 1, and also includes:

[0043] The brine mixing pipeline 3 is used to introduce brine into the outlet pipeline 2 and flush the outlet pipeline 2. The brine mixing pipeline 3 is connected to the outlet pipeline 2.

[0044] A brine supply device is used to supply brine from the flushing outlet pipeline 2 to the brine mixing pipeline 3; the brine supply device is connected to the brine mixing pipeline 3; the brine supply device includes a storage tank for storing brine and a pump for conveying brine from the storage tank to the brine mixing pipeline 3.

[0045] The brine mixing control valve 4 is used to control the inflow and stop the inflow of brine into the outlet pipeline 2. The brine mixing control valve 4 is located on the brine mixing pipeline 3 and between the brine supply device and the outlet pipeline 2. In this embodiment, the brine mixing control valve 4 can be specifically implemented using, for example, the Netzsch ZJHP series pneumatic regulating valve.

[0046] The outlet control valve 5 is used to control the outflow and stop the outflow of crystallized salt in the outlet pipeline 2. The outlet control valve 5 is located at the end of the outlet pipeline 2. The connection between the brine mixing pipeline 3 and the outlet pipeline 2 is located between the falling film evaporator 1 and the outlet control valve 5. In this embodiment, the outlet control valve 5 can be specifically implemented using, for example, the Netzsch ZJHP series pneumatic regulating valve.

[0047] The control system is connected to both the brine mixing control valve 4 and the outlet control valve 5. The control system receives signals from the outlet control valve 5 and the brine mixing control valve 4 and controls their opening and closing. The control system is a programmable logic controller (PLC) system, which has the ability to receive input signals, process signals, and output control commands according to a preset program. In this embodiment, the control system can be implemented using, for example, a Siemens S7-300 series.

[0048] In actual operation, when the crystallized salt in the outlet pipeline 2 needs to be discharged, the control system controls the outlet control valve 5 to open, and the crystallized salt flows out from the outlet pipeline 2. When the outlet pipeline 2 needs to be flushed, the control system controls the brine mixing control valve 4 to open, and the brine flows from the brine mixing pipeline 3 into the outlet pipeline 2 to flush the pipeline.

[0049] Example 2

[0050] The automatic salt output device of the shale gas production water evaporation crystallization system in this embodiment, such as Figure 1 Based on Example 1, it also includes a purified water pipeline 6, which is used to introduce purified water into the outlet pipeline 2 and flush the outlet pipeline 2. The purified water pipeline 6 is connected to the outlet pipeline 2 between the falling film evaporator 1 and the outlet control valve 5.

[0051] A purified water supply device is used to supply purified water to the purified water pipeline 6 for flushing the outlet pipeline 2. The purified water supply device is connected to the purified water pipeline 6. The purified water supply device includes a water storage tank for storing purified water and a pump for conveying purified water from the water storage tank to the purified water pipeline 6.

[0052] The flushing control valve 7 is used to control the inflow and stop the inflow of purified water into the outlet pipeline 2. The flushing control valve 7 is located on the purified water pipeline 6 and between the purified water supply device and the outlet pipeline 2. In this embodiment, the flushing control valve 7 is also a Netzsch pneumatic regulating valve ZJHP series.

[0053] The control system is also connected to the flushing control valve 7, and the control system is also used to receive signals from the flushing control valve 7 and control the flushing control valve 7 to open and close.

[0054] In actual operation, when it is necessary to use purified water to flush the outlet pipeline 2, the control system controls the flushing control valve 7 to open, and purified water flows from the purified water pipeline 6 into the outlet pipeline 2 to flush the pipeline.

[0055] Example 3

[0056] The automatic salt discharge device of the shale gas production water evaporation crystallization system in this embodiment, based on the aforementioned embodiment, further includes a weighing module. The weighing module monitors the weight of the crystallized salt discharged from outlet pipeline 2. The control system is also connected to the weighing module and receives signals from the weighing module. When the weight of the crystallized salt reaches a set threshold, the control system adjusts the opening of the outlet control valve 5. Specifically, the weighing module in this embodiment can be implemented using, for example, the GX-NS-300kg from AC Systems, Inc. (USA).

[0057] The control system is also used to open the brine mixing control valve 4 when the weighing module detects that the weight of the crystallized salt discharged from the outlet pipeline 2 has not changed within a set time period threshold t1.

[0058] The control system is also used to open the flushing control valve 7 when the weighing module detects that the weight of the crystallized salt discharged from the outlet pipeline 2 does not change within a set time period threshold t2.

[0059] The control system is also used to adjust the opening time and opening degree of the brine control valve and the flushing control valve 7 when the weighing module detects that the flow rate of the mixture of crystallized salt and brine or the mixture of crystallized salt and purified water discharged from the outlet pipeline 2 reaches V.

[0060] The specific implementation process is as follows:

[0061] Crystallized salt is discharged through outlet pipeline 2, at which point the weighing module begins monitoring the weight of the crystallized salt. When the weight of the crystallized salt reaches a set threshold, the control system automatically adjusts the opening of outlet control valve 5 to control the discharge rate of the crystallized salt, ensuring that the amount of crystallized salt discharged meets the preset requirements.

[0062] During the discharge of crystallized salt, the weighing module continuously monitors the weight of the crystallized salt discharged from outlet pipeline 2. If the weight of the crystallized salt remains unchanged within a set time threshold t1, it indicates that the crystallized salt is not being continuously discharged and outlet pipeline 2 is blocked. At this point, the control system receives a signal from the weighing module and controls the brine mixing control valve 4 to open, allowing brine to flow from brine mixing pipeline 3 into outlet pipeline 2 to flush it. During the flushing process, the control system can adjust the brine flow rate and flushing time as needed.

[0063] Similarly, the weighing module continuously monitors the weight of the crystallized salt discharged from outlet pipeline 2. If the weight of the crystallized salt remains unchanged within a set time period threshold t2 (in actual applications, t2 is greater than t1), it indicates that brine flushing may not have completely resolved the problem or that the system has completed the discharge of crystallized salt. In this case, further flushing with purified water is required. After receiving the signal from the weighing module, the control system controls the flushing control valve 7 to open, allowing purified water to flow from the purified water pipeline 6 into outlet pipeline 2 to flush outlet pipeline 2. During the flushing process, the control system can also adjust the flow rate of purified water and the flushing time as needed.

[0064] During the flushing of outlet pipeline 2 with brine or purified water, the weighing module also monitors the flow rate of the mixture of crystallized salt and brine or the mixture of crystallized salt and purified water discharged from outlet pipeline 2 in real time. When the flow rate reaches the preset flow rate V, it indicates that outlet pipeline 2 is basically unobstructed. At this time, the control system will automatically adjust the opening time and opening degree of brine control valve and flushing control valve 7 to control the flushing effect and ensure that the flushing process is both effective and economical.

[0065] Throughout the entire operation, the control system monitors the operating status and parameter changes of each part in real time to ensure the stable operation of the system.

[0066] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An automatic salt discharge device for a shale gas production water evaporation and crystallization system, comprising a falling film evaporator and an outlet pipeline connected to the outlet of the falling film evaporator, characterized in that, Also includes: The brine mixing pipeline is used to introduce brine into the outlet pipeline and flush the outlet pipeline. The brine mixing pipeline is connected to the outlet pipeline. A brine supply device is used to supply brine to the brine mixing pipeline for flushing the outlet pipeline; the brine supply device is connected to the brine mixing pipeline. The brine mixing control valve is used to control the inflow and stop the inflow of brine into the outlet pipeline; the brine mixing control valve is installed on the brine mixing pipeline and located between the brine supply device and the outlet pipeline; The outlet control valve is used to control the outflow and stop the outflow of crystallized salt in the outlet pipeline. The outlet control valve is located at the end of the outlet pipeline. The connection between the brine mixing pipeline and the outlet pipeline is located between the falling film evaporator and the outlet control valve. The control system is connected to both the brine mixing control valve and the outlet control valve. The control system receives signals from both valves and controls their opening and closing. The purified water pipeline is used to introduce purified water into the outlet pipeline and flush the outlet pipeline. The purified water pipeline is connected to the outlet pipeline between the falling film evaporator and the outlet control valve. A purified water supply device is used to supply purified water to the purified water pipeline for flushing the outlet pipeline. The purified water supply device is connected to the purified water pipeline. A flushing control valve is used to control the inflow and stop the inflow of purified water into the outlet pipeline; the flushing control valve is located on the purified water pipeline and between the purified water supply device and the outlet pipeline; The control system is also connected to the flushing control valve, and the control system is also used to receive signals from the flushing control valve and control the flushing control valve to open and close. It also includes a weighing module, which is used to monitor the weight of the crystallized salt discharged from the outlet pipeline; the control system is also connected to the weighing module, and the control system is also used to receive the signal from the weighing module and adjust the opening of the outlet control valve when the weight of the crystallized salt reaches a set threshold.

2. The automatic salt extraction device for a shale gas production water evaporation and crystallization system according to claim 1, characterized in that, The control system is also used to open the brine mixing control valve when the weighing module detects that the weight of the crystallized salt discharged from the outlet pipeline does not change within a set time period threshold t1.

3. An automatic salt-producing device for a shale gas production water evaporation and crystallization system according to claim 2, characterized in that, The control system is also used to open the flushing control valve when the weighing module detects that the weight of the crystallized salt discharged from the outlet pipeline does not change within a set time period threshold t2.

4. An automatic salt-producing device for a shale gas production water evaporation and crystallization system according to claim 3, characterized in that, The control system is also used to adjust the opening time and degree of the brine control valve and the flushing control valve when the weighing module detects that the flow rate of the mixture of crystallized salt and brine or the mixture of crystallized salt and purified water discharged from the outlet pipeline reaches V.

5. An automatic salt-producing device for a shale gas production water evaporation and crystallization system according to claim 4, characterized in that: The brine supply system includes a storage tank for storing brine and a pump for transferring the brine from the storage tank to the brine mixing pipeline.

6. An automatic salt-producing device for a shale gas production water evaporation and crystallization system according to claim 5, characterized in that: The purified water supply system includes a water storage tank for storing purified water and a pump for conveying the purified water from the water storage tank to the purified water pipeline.

7. An automatic salt-producing device for a shale gas production water evaporation and crystallization system according to claim 6, characterized in that: The control system is a programmable logic controller system, which has the ability to receive input signals, process signals, and output control commands according to a preset program.

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