Control system for continuous and stable salt discharge of salt slurry thickener

Abstract

The utility model relates to the technical field of salt manufacturing drying systems, and particularly discloses a control system for continuous and stable salt discharging of a salt slurry thickener. Comprising a flushing switch valve assembly arranged on a salt discharging pipeline connected with a salt slurry thickener, a flow control assembly arranged on the salt discharging pipeline and used for controlling flow, and a control system connected with the flushing switch valve assembly and the flow control assembly. The flushing switch valve assembly and the flow control assembly are sequentially arranged in the flowing direction of salt slurry in the salt discharging pipeline. The salt slurry thickener can stably control the process flow, can automatically flush pipelines, instruments and valves at regular time, and can effectively solve the problems of low efficiency, poor process stability, low accuracy and easiness in blockage of manual salt discharge of the traditional salt slurry thickener.

Description

TECHNICAL FIELD

[0001] The utility model relates to salt making drying system technical field more specifically, relate to a kind of control system that salt slurry thickener continuous stable salt is discharged. BACKGROUND

[0002] In prior art, salt plant usually adopts manual or remote control salt discharge valve of salt discharge pipeline to realize that salt slurry thickener is discharged through salt discharge pipeline, and worker's work intensity is big, and salt discharge efficiency is low.

[0003] Manual salt discharge or remote control salt discharge cannot control valve size in real time according to process actual salt slurry flow, and only valve opening can be adjusted by experience, and adjustment difficulty is high, not timely, opening degree is difficult to adjust accurately, flow cannot be stably controlled in suitable range, and control precision is insufficient, and stability is poor.

[0004] Salt slurry concentration in salt slurry thickener salt discharge pipe is high, in whole salt discharge pipeline, especially in instrument, valve connection place and salt discharge pipe turning place and other easy accumulation places and its easy crystallization cause whole pipeline blockage, frequent shutdown flushing is needed, production continuity is not good enough, and maintenance difficulty and maintenance cost are increased. UTILITY MODEL CONTENT

[0005] The utility model solves the technical problem that a kind of control system that salt slurry thickener continuous stable salt is discharged is provided;

[0006] The solution scheme that the utility model solves technical problem is as follows:

[0007] A kind of control system that salt slurry thickener continuous stable salt is discharged, including the flushing switch valve assembly of being set on the salt discharge pipeline connected with salt slurry thickener, the flow control assembly for being set on salt discharge pipeline and being used to control flow, and the control system respectively connected with flushing switch valve assembly and flow control assembly;The flushing switch valve assembly, flow control assembly are sequentially arranged along the flowing direction of salt slurry in salt discharge pipeline.

[0008] In some possible implementation, the flushing switch valve assembly includes flushing water pipe connected with salt discharge pipeline and external flushing water, flushing switch valve one and flushing switch valve two are sequentially arranged along the flowing direction of salt slurry in salt discharge pipeline and installed on salt discharge pipeline;The connecting point of flushing water pipe and salt discharge pipeline is arranged between flushing switch valve one and flushing switch valve two;Flushing switch valve one and flushing switch valve two are respectively connected with control system.

[0009] In some possible implementation, flushing switch valve three connected with control system is arranged on the flushing water pipe.

[0010] In some possible implementation manners, a flushing process valve is further arranged on the flushing water pipe; the flushing process valve, the flushing switch valve one and the flushing switch valve two are sequentially arranged along the flow direction of the flushing water in the flushing water pipe.

[0011] In some possible implementation manners, the flow control assembly comprises a flow meter arranged on the salt discharge pipe and connected with the control system, and a flow regulating valve arranged on the salt discharge pipe and connected with the control system; the flushing switch valve one, the flushing switch valve two, the flow meter and the flow regulating valve are sequentially arranged along the flow direction of the salt slurry in the salt discharge pipe.

[0012] In some possible implementation manners, a salt discharge process valve is further arranged on the salt discharge pipe; the salt discharge process valve, the flushing switch valve one and the flushing switch valve two are sequentially arranged along the flow direction of the salt slurry in the salt discharge pipe.

[0013] In some possible implementation manners, the salt discharge pipe is two groups, and the flushing switch valve assembly and the flow control assembly are also two groups and are arranged in one-to-one correspondence with the salt discharge pipes.

[0014] In some possible implementation manners, the salt discharge pipe is connected with a centrifuge away from the salt slurry thickener.

[0015] In some possible implementation manners, the distance between the flow meter and the flushing switch valve two is 5D, and the distance between the flow meter and the flow regulating valve is 3D; wherein D is the pipe diameter of the salt discharge pipe.

[0016] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0017] The utility model discloses a flow meter, flow regulating valve, control system's cooperation, and the flow meter carries out real-time monitoring to the flow of salt slurry, and passes data to control system, and control system judges data to control flow regulating valve adjustment opening degree, thereby realizing the effective control to the discharge of salt flow.

[0018] The utility model discloses the cooperation of flushing switch valve one, flushing switch valve two, flushing switch valve three can effectively realize the flushing of salt discharge pipe and relevant valve, and avoid the situation of blocking.

[0019] The utility model can stably control process flow, can also automatically wash pipe, instrument, valve in time, can effectively solve the problem of low efficiency, poor process stability, low accuracy and easy blocking of traditional salt slurry thickener manual salt discharge. DRAWINGS

[0020] Figure 1 It is the connection schematic drawing of the utility model;

[0021] Figure 2The utility model discloses a control system, flush switch valve assembly, flow control assembly, the connecting relation schematic drawing of salt pipeline shows of the utility model.

[0022] Among them: 1, salt slurry thickener, 2, flow meter, 3, flow regulating valve, 4, flush switch valve three, 5, flush switch valve one, 6, flush switch valve two, 7, flush process valve, 8, salt discharge process valve, 9, control system, 10, centrifuge, 20, salt pipeline. DETAILED DESCRIPTION

[0023] In the utility model, unless there is definite and limited, the terms " install " " connect " " connect " " fixed " and so on terms should do broad sense, for example, can be fixed connection, also can be detachable connection, or integral ; can be directly connected, also can be indirectly connected through intermediate medium, can be the intercommunication of two elements or the interaction of two elements. The " first " " second " and similar words mentioned in the application do not represent any order, quantity or importance, but only distinguish different components. Similarly, " one " or " a " and similar words do not represent quantity limit, but represent that there is at least one. In the implementation of the application, the association relationship of the associated object is described as " and / or ", which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In the description of the embodiments of the application, unless otherwise specified, the meaning of " multiple " is two or more. For example, multiple positioning columns refer to two or more positioning columns. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific situation.

[0024] The utility model will be explained in detail as follows.

[0025] As shown in Figure 1 , Figure 2 ,

[0026] A kind of salt slurry thickener 1 continuous stable salt discharge control system 9, including being set on flush switch valve assembly of salt pipeline 20 connected with salt slurry thickener 1, flow control assembly for controlling flow being set on salt pipeline 20, and control system 9 connected with flush switch valve assembly and flow control assembly respectively;Flush switch valve assembly, flow control assembly are sequentially arranged along the flow direction of salt slurry in salt pipeline 20;Control unit is PLC or DCS control system 9.

[0027] Through the cooperation of flush switch valve assembly and control system 9, the salt block covering and gathering inside pipeline and instrument, valve can be timely and effectively washed away, so as to avoid blockage, so that the whole process link is efficiently, continuously, accurately and stably operated;

[0028] The cooperation of the flow control assembly and the control system 9 can realize real-time and effective control of the flow of the salt slurry in the salt discharge pipeline 20, thereby realizing dynamic stability of the salt slurry pipe salt discharge flow.

[0029] In some possible embodiments, in order to effectively realize flushing of the salt discharge pipeline 20 and related instruments and valves on the salt discharge pipeline 20, the flushing switch valve assembly comprises a flushing water pipe connected with the salt discharge pipeline 20 and externally connected with flushing water, flushing switch valve one 5 and flushing switch valve two 6 installed on the salt discharge pipeline 20 and arranged in sequence along the flow direction of the salt slurry in the salt discharge pipeline 20; the connection point of the flushing water pipe and the salt discharge pipeline 20 is arranged between the flushing switch valve one 5 and the flushing switch valve two 6; the flushing switch valve one 5 and the flushing switch valve two 6 are respectively connected with the control system 9; the flushing switch valve three 4 connected with the control system 9 is arranged on the flushing water pipe; the flushing process valve 7 is further arranged on the flushing water pipe; the flushing process valve 7 and the flushing switch valve three 4 are arranged in sequence along the flow direction of the flushing water in the flushing water pipe; the salt discharge process valve 8 is further arranged on the salt discharge pipeline 20; the salt discharge process valve 8, the flushing switch valve one 5 and the flushing switch valve two 6 are arranged in sequence along the flow direction of the salt slurry in the salt discharge pipeline 20.

[0030] Specifically, the flushing process valve 7 and the salt discharge process valve 8 are manual valves.

[0031] During flushing, the flushing switch valve three 4 is opened, and flushing is performed in two stages. First, the flushing switch valve two 6 is closed, and the flushing switch valve one 5 is opened. The flushing water enters the salt discharge pipeline 20 from the flushing water pipe. Since the flushing switch valve two 6 is closed and the flushing switch valve one 5 is opened, the flow control assembly is opened, the flushing water flows in the salt discharge pipeline 20 and will finally flow to the side of the flushing switch valve one 5, and enters the salt slurry thickener 1, thereby realizing flushing of the partial segment between the flushing switch valve one 5 and the salt slurry thickener 1 in the salt discharge pipeline 20.

[0032] Subsequently, the flushing switch valve one 5 is closed, and the flushing switch valve two 6 is opened. The flow control assembly is fully opened, the flushing water flows in the salt discharge pipeline 20 and will finally flow to the side of the flow control assembly, thereby realizing flushing of the partial segment between the flushing switch valve two 6 and the centrifuge 10 in the salt discharge pipeline 20, and flushing of the entire salt discharge pipeline 20 and the valves thereon; the flushing time of the two partial segments can be adjusted according to actual conditions (such as different medium concentrations and production capacities); preferably, the flushing time of the two partial segments is the same, and is 3 minutes, thereby meeting the needs of most continuous production.

[0033] During flushing, the flow regulating valve 3 is in a fully open state.

[0034] In normal operation, the flow control component returns to normal working state, closes the flush water switch valve three 4, opens the flush water switch valve one 5, and opens the flush water switch valve two 6 to carry out the salt discharge work; preferably, the salt discharge work time is 54 minutes;

[0035] That is, 60 minutes is taken as one cycle, and the reciprocating cycle is carried out; in the salt discharge work, the flow regulating valve 3 returns to the normal working state, closes the flush water switch valve three 4, opens the flush water switch valve one 5, and opens the flush water switch valve two 6 to ensure that the salt discharge process can be normally operated;

[0036] The flush water switch valve one 5, the flush water switch valve two 6, and the flush water switch valve three 4 are the same, and all adopt the pneumatic O-shaped switch ball valve in the prior art; the control system 9 realizes the opening and closing of the above-mentioned three switch valves by turning on and off the power supply of the electromagnetic valve on the pneumatic O-shaped switch ball valve, and verifies whether the valve is fully opened or fully closed as required by the SPDT on the pneumatic O-shaped switch ball valve.

[0037] In some possible embodiments, in order to effectively realize the control of the salt slurry flow, so that the flow of the salt slurry in the salt discharge pipeline 20 meets the requirements, thereby realizing the dynamic stability of the salt slurry flow; the flow control component includes a flow meter 2 installed on the salt discharge pipeline 20 and connected with the control system 9, and a flow regulating valve 3 installed on the salt discharge pipeline 20 and connected with the control system 9; the flush switch valve one 5, the flush switch valve two 6, the flow meter 2, and the flow regulating valve 3 are sequentially arranged along the flow direction of the salt slurry in the salt discharge pipeline 20;

[0038] The flow meter 2 adopts a pipeline type electromagnetic flow meter 2 to detect the salt slurry flow; the flow meter 2 is installed on the salt discharge pipeline 20 and can obtain the accurate flow of the salt slurry in real time.

[0039] The flow regulating valve 3 is installed downstream of the electromagnetic flow meter 2 on the salt discharge pipeline 20; a pneumatic V-shaped regulating ball valve in the prior art is adopted, and the valve core is a V-shaped valve core; the flow regulating valve 3 has a self-cleaning function and can normally operate under the working condition of high viscosity and easy crystallization blockage, and controls the flow of the salt discharge. The flow regulating valve 3 adopts an intelligent positioner, the intelligent positioner has a valve position control and valve position feedback function, can remotely control the valve opening degree by the control system 9, and can see the actual size of the valve opening degree; the pneumatic V-shaped regulating ball valve has one two-position three-way electromagnetic valve to control the opening and closing of the valve, and the valve selects the open position when the air source fails, and the pneumatic V-shaped regulating ball valve can be fully opened by disconnecting the two-position three-way electromagnetic valve.

[0040] The flow regulating valve 3 adopts a PID flow control mode to realize control; when salt is discharged, the electromagnetic flowmeter 2 sends the detected value monitored in real time to the control system 9, the control system 9 compares the detected value with the SP preset value, adjusts the opening degree of the flow regulating valve 3, realizes automatic adjustment of the opening degree, and thus accurately meets the process requirement flow of the salt slurry thickener 1 for discharging salt, and improves stability, continuity and accuracy.

[0041] Specifically, when the detected value is lower than the SP preset value, the control system 9 increases the opening degree of the flow regulating valve 3.

[0042] When the detected value is higher than the SP preset value, the control system 9 decreases the opening degree of the flow regulating valve 3.

[0043] In some possible implementation manners, the salt discharging pipelines 20 are two groups, and the flushing switch valve assemblies and the flow control assemblies are also two groups and are arranged in one-to-one correspondence with the salt discharging pipelines 20.

[0044] The two groups of salt discharging pipelines 20 cooperate with the two groups of flushing switch valve assemblies and the two groups of flow control assemblies to simultaneously perform flushing or salt discharging work.

[0045] In some possible implementation manners, the salt discharging pipelines 20 are connected to the centrifuges 10 away from the salt slurry thickener 1; the salt slurry stably enters the centrifuges 10 through the salt discharging pipelines 20 and is processed in the next process.

[0046] Further, the flow regulating valve 3 is fault open, the flushing water switch valve three 4 is fault closed, the flushing water switch valve one 5 is fault open, and the flushing water switch valve two 6 is fault open; the above selection can meet that, when the gas source of the control valve fails, the process can still normally operate without stopping and removing the fault online, at this time; fault open means that, when the gas source of the corresponding valve fails, the valve can automatically switch to a fully open state; fault closed means that, when the gas source of the corresponding valve fails, the valve can automatically switch to a fully closed state.

[0047] In some possible implementation manners, in order to make the flow data monitored by the flowmeter more accurate, the distance between the flowmeter and the flushing switch valve two is 5D, and the distance between the flowmeter and the flow regulating valve is 3D; wherein D is the pipe diameter of the salt discharging pipeline.

[0048] The utility model is not limited to the foregoing specific embodiments. The utility model extends to any new feature or any new combination disclosed in the specification, and any new method or process step or any new combination disclosed.

Claims

1. A control system for continuous and stable salt discharge of a salt slurry thickener, characterized by, The control system is connected with the flushing switch valve assembly and the flow control assembly respectively.

2. The control system for continuous and stable salt discharge of a salt slurry thickener according to claim 1, wherein The flushing switch valve assembly comprises a flushing water pipe connected with the salt discharge pipeline and outside of which the flushing water is arranged, and flushing switch valve one and flushing switch valve two are installed on the salt discharge pipeline and arranged in sequence along the flowing direction of the salt slurry in the salt discharge pipeline.

3. The control system for continuous and stable salt discharge of a salt slurry thickener according to claim 2, characterized in that, The connection point of the flushing water pipe and the salt discharge pipeline is arranged between the flushing switch valve one and the flushing switch valve two.

4. The control system for continuous and stable salt discharge of a salt slurry thickener according to claim 3, wherein The flushing switch valve three is arranged on the flushing water pipe and connected with the control system.

5. The control system for continuous and stable salt discharge of a salt slurry thickener according to claim 2, wherein The flushing process valve is further arranged on the flushing water pipe.

6. The control system for continuous and stable salt discharge of a salt slurry thickener according to claim 2, wherein The flow control assembly comprises a flow meter installed on the salt discharge pipeline and connected with the control system, and a flow regulating valve installed on the salt discharge pipeline and connected with the control system.

7. The control system for continuous and stable salt discharge of a salt slurry thickener according to claim 1, wherein The flushing process valve is further arranged on the salt discharge pipeline.

8. The control system for continuous and stable salt discharge of a salt slurry thickener according to any one of claims 1 to 7, characterized in that, The salt discharge pipeline is two groups, and the flushing switch valve assembly and the flow control assembly are also two groups and correspond to the salt discharge pipeline one by one.

9. The control system for continuous and stable salt discharge of a salt slurry thickener according to claim 5, wherein The centrifuge is connected with the salt discharge pipeline away from the salt slurry thickener. The distance between the flow meter and the flushing switch valve two is 5D, and the distance between the flow meter and the flow regulating valve is 3D; wherein D is the pipe diameter of the salt discharge pipeline.

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