CN110657350A - Protection device and method for low-pressure system equipment for ore pulp pipeline transportation - Google Patents
Protection device and method for low-pressure system equipment for ore pulp pipeline transportation Download PDFInfo
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- CN110657350A CN110657350A CN201910774247.1A CN201910774247A CN110657350A CN 110657350 A CN110657350 A CN 110657350A CN 201910774247 A CN201910774247 A CN 201910774247A CN 110657350 A CN110657350 A CN 110657350A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/14—Conveying liquids or viscous products by pumping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
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Abstract
The invention discloses a protection device for low-pressure system equipment for ore pulp pipeline transportation, which comprises a pressure relief pipeline, a pressure safety valve, a pressure detector, a flow detector, an electric control valve, a PLC (programmable logic controller), an ultrahigh pressure alarm, a leakage alarm and a pulp outlet pipeline connected between a feeding pump and a booster pump of an ore pulp pipeline transportation system. According to the invention, the pressure relief protection device is added to the slurry outlet pipeline with the largest pressure change, so that the damage to equipment of a pipeline low-pressure system caused by high pressure instantaneously formed in the pipeline is reduced. When the pressure relief protection is carried out, the due protection effect cannot be achieved when the conditions that a pressure relief pipeline and a pressure safety valve of the pressure relief protection device are damaged, blocked or damaged and leaked are taken into consideration, so that components such as a flow detector, a PLC (programmable logic controller), an ultrahigh pressure alarm, a leakage alarm and the like are additionally arranged in the design, the protection device is monitored and managed, and the stability and the reliability of the protection device are further improved.
Description
Technical Field
The invention relates to the field of ore pulp conveying, in particular to a protection device and a protection method for low-pressure system equipment for ore pulp pipeline conveying.
Background
In the industrial production of coal, mining industry, steel and the like, a multi-stage pump station mode is adopted to carry out long-distance pipeline conveying on ore pulp or slurry and the like in the production, and the method is a liquid object conveying mode which is more environment-friendly and economical.
In the prior art, according to the conveying process requirement, a long-distance ore pulp pipeline connects or disconnects conveying operation between pump stations, traditionally, two pump station devices need to be shut down for protecting equipment of a pipeline low-pressure system, and the pump station devices are restarted after the pipeline connection or disconnection of a conveying valve is switched, so that the pump station devices and the ore pulp pipeline are shut down with pulp, and the safe operation of the pipeline is influenced.
At present, by means of process technology transformation, operation skills are continuously improved, operation methods are optimized, and connection or disconnection conveying is carried out between pump stations under the condition that pump station equipment does not stop, so that the condition that production is influenced by the fact that pipeline conveying is not stopped is guaranteed, and the risk that slurry in a slurry pipeline is stopped with slurry is reduced. However, "pulp piping mode switching" is a frequently and extremely important process of operation in industrial production, particularly in iron concentrate pulp transportation. The following disadvantages also exist in practical use:
when the tail of the water-driven slurry of the upper-stage pump station reaches the station and the slurry conveying in the stirring tank is finished, and the water-driven slurry is switched, in order to save energy and reduce consumption and reduce the consumption of spare parts, the upper-stage pump station and the station booster pump are switched into a pipe-connected conveying mode, and the concrete operation steps are as follows (as shown in the attached figure 1): the second high-pressure ball valve 102 is closed, the first high-pressure ball valve 101 is opened while the second high-pressure ball valve 102 is closed, the third high-pressure ball valve 103 is closed, because the flow in the slurry outlet pipeline 2 at the outlet of the feeding pump 10 and the high-pressure pipeline directly connected between the upper-level pump station and the booster pump is larger than the inlet flow of the booster pump, the pressure in the slurry outlet pipeline 2 at the outlet of the feeding pump 4 is overhigh, the slurry outlet pipeline 2 belongs to a low-pressure pipeline, so that the whole pipeline system, particularly the slurry outlet pipeline 2 generates the conditions of sharp vibration and large pressure fluctuation, finally, the vulnerable parts (such as the outlet valve 204 of the feeding pump, the feeding pump 10, the booster pump, the pressure relief pipeline 1 and the like) of the equipment of the low-pressure pipeline system are damaged (the common vulnerable parts comprise an impeller, a volute, a lining plate and the like), so that the service life of the equipment is shortened, safety accidents can be seriously caused, and great harm is caused.
Disclosure of Invention
The invention aims to solve the problems that; the protection device and the protection method for the low-pressure system equipment for ore pulp pipeline conveying are provided aiming at the defects and shortcomings of the prior art, the pressure relief protection device is additionally arranged at the position of the ore pulp pipeline, high pressure formed in the low-pressure pipeline is timely relieved, normal operation of the conveying system is guaranteed, devices such as a relevant controller, a detector and an alarm are designed to monitor components in the pressure relief protection device, and the condition that accidents occur due to the fact that the pressure cannot be relieved in time due to faults of the pressure relief protection device is avoided.
In order to achieve the purpose, the invention adopts the technical scheme that:
a protection device for low-pressure system equipment for ore pulp pipeline transportation comprises a pressure relief pipeline, a pressure safety valve, a pressure detector, a flow detector, an electric control valve, a PLC (programmable logic controller), an ultrahigh pressure alarm, a leakage alarm and an ore pulp outlet pipeline connected between a feeding pump and a booster pump of the ore pulp pipeline transportation system;
the inlet end of the pressure relief pipeline is connected to the slurry outlet pipeline in a closed mode, the outlet end of the pressure relief pipeline is connected into the stirring tank of the ore pulp pipeline conveying system, the electric control valve, the flow detector and the pressure safety valve are sequentially arranged in the pressure relief pipeline, the electric control valve and the flow detector are located close to the inlet end of the pressure relief pipeline, and the pressure detector is arranged in the slurry outlet pipeline;
the PLC controller, the ultrahigh pressure alarm and the leakage alarm are arranged near the pressure relief pipeline, and the PLC controller is in circuit connection with the ore pulp pipeline conveying control management center, the pressure safety valve, the pressure detector, the flow detector, the electric control valve, the ultrahigh pressure alarm and the leakage alarm.
The scheme is that in the existing long-distance ore pulp pipeline conveying system, a pressure relief protection device is added to the pulp outlet pipeline with the largest pressure change, so that the damage to equipment (such as a valve, a feeding pump, a pipeline and the like) of a pipeline low-pressure system caused by high pressure formed in the pipeline instantaneously is reduced. When the pressure relief protection is carried out, the due protection effect cannot be achieved when the conditions that a pressure relief pipeline and a pressure safety valve of the pressure relief protection device are damaged, failed, blocked or damaged and leaked are taken into consideration, so that the flow detector, the PLC, the ultrahigh pressure alarm, the leakage alarm and other parts are additionally arranged in the design and used for monitoring and managing the protection device, and the protection device is guaranteed to play a role in protecting low-pressure system equipment by virtue of pressure relief.
Further, the pressure safety valve sets a pressure relief threshold; and when the pressure in the slurry outlet pipeline is greater than the pressure relief threshold value, the pressure relief valve is opened to relieve the pressure, otherwise, the pressure relief valve is in a closed state.
Further, the electric control valve is controlled to be opened and closed by a PLC controller and is in a normally open state in use.
The main purpose of setting the electric control valve is to close the inlet of the pressure relief pipeline when the pressure relief valve or the pressure relief pipeline has a fault, so that the electric control valve is in an open state in normal use.
Further, the PLC controller timely transmits the detection data of the pressure detector and the flow detector to the ore pulp pipeline conveying control management center, and controls the opening or closing of the electric control valve, the ultrahigh pressure alarm and the leakage alarm.
In the above steps, the PLC controller is used as a control center of the pressure relief protection device, and is mainly used for managing and controlling related components of the pressure relief protection device, and is responsible for reading data, transmitting information, and analyzing and judging related data to form a control command. And the PLC controller is connected with the ore pulp pipeline conveying control management center to form the coordinated control and control of the whole ore pulp pipeline conveying system, so that the operation of the ore pulp pipeline conveying system is more reliable and stable.
Further, the ultrahigh pressure alarm comprises a red flashing indicator light and an alarm loudspeaker, and the leakage alarm comprises a yellow flashing indicator light and an alarm loudspeaker.
Further, the pressure relief threshold of the pressure relief valve is 0.28 MPa.
In the above, according to the different requirements of the equipment of ore pulp pipeline transportation low pressure system, the pressure relief valve that has different pressure release thresholds in the market can be selected for use and installed.
The scheme also provides a protection method of the protection device for the low-pressure system equipment for ore pulp pipeline transportation, when the ore pulp pipeline transportation system is started to operate, the steps of protecting the low-pressure system equipment for ore pulp pipeline transportation are as follows:
s1: when the pressure detector detects that the pressure in the pulp outlet pipeline is greater than the pressure relief threshold value of the pressure relief valve, the pressure relief valve is automatically opened to relieve the pressure, the ore pulp flows into the stirring tank through the pressure relief pipeline to be recycled, and if the pressure in the pulp outlet pipeline gradually falls back to be less than the pressure relief threshold value of the pressure relief valve through pressure relief, the pressure relief valve is automatically closed;
s2: if the pressure detector in the step S1 detects that the pressure in the pulp outlet pipeline is greater than the pressure relief threshold value of the pressure safety valve, the pressure of the pulp outlet pipeline is continuously increased to a higher value and the pressure does not show a reduction trend, stopping ore pulp conveying operation, and overhauling the protection device;
s3: under the condition that the pressure is not released in the step S1, if the pressure in the pulp outlet pipeline is smaller than the pressure release threshold of the pressure relief valve, the flow detector detects that the pulp in the pressure release pipeline continuously flows, and the electronic control valve is closed, so as to overhaul the protection device.
Further, the specific processing flow when the pressure in the slurry outlet pipe is continuously increased to a higher value and the pressure does not exhibit a decreasing trend in step S2 is as follows:
s2.1: the PLC controls the ultrahigh-voltage alarm to give out red flashing lights and sounds for alarming;
s2.2: when the step S2.1 is implemented, the PLC controller sends a request for stopping ore pulp conveying operation to the ore pulp pipeline conveying system, and the ore pulp pipeline conveying system timely controls related equipment to stop the ore pulp conveying operation;
s2.3: the PLC sends an instruction to the electric control valve to close the electric control valve;
s2.4: when the worker arrives at the site, the pressure safety valve is checked to judge whether the pressure safety valve is damaged or fails or blocked, and corresponding maintenance is carried out;
s2.5: and restarting the ore pulp pipeline conveying system, controlling the electric control valve to be opened by the PLC, and protecting the normal operation of the device.
Further, the specific processing flow of the flow detector in step S3 when detecting that the slurry in the pressure relief pipeline continuously flows is as follows:
s3.1: when the PLC controller judges that the flow value measured by the flow detector is continuously larger than 0, the PLC controller controls the leakage alarm to give out yellow flashing lights and sounds for alarming;
s3.2: the PLC sends an instruction to the electric control valve to close the electric control valve;
s3.3: when the worker arrives at the site, the protection device is checked, whether the pressure safety valve is damaged and leaked or not, whether the pressure relief pipeline is not well sealed or damaged and leaked or not is judged, and corresponding maintenance is carried out;
s3.4: the staff opens the automatically controlled valve through PLC controller manual start, and protection device normal operating.
In the above protection method, since the pressure in the slurry outlet pipe continuously rises to a higher value and the pressure does not exhibit a decreasing trend is a time process, in practical use, a value of the time process (which may be simply referred to as a determination time limit value) may be set, and when the process is greater than the determination time limit value, the corresponding process flow may be entered, for example, the determination time limit value is set to 5 minutes, and when the pressure in the slurry outlet pipe continuously rises to a higher value and the pressure does not exhibit a decreasing trend for a duration greater than 5 minutes, the corresponding process flow may be entered.
In addition, for the situations of damaged leakage of the pressure safety valve, poor sealing of the pressure relief pipeline or damaged leakage, because the ore pulp in the pressure relief pipeline does not flow under normal conditions, but the condition that the inrush current of the pulp outlet pipeline influences the temporary flowing of the ore pulp in the pressure relief pipeline when the ore pulp pipeline conveying system is started or suspended is not excluded, in the practical use, a flow value duration value (which can be simply referred to as a flow time limit value) measured by a flow detector can be set, when the ore pulp continuous flowing time in the pressure relief pipeline is greater than the flow time limit value, the corresponding treatment process can be entered, for example, the flow time limit value is set to 30 minutes, and when the ore pulp continuous flowing time in the pressure relief pipeline is 30 minutes (i.e., the time that the measured flow value is greater than 0 is greater than 30 minutes), the corresponding treatment process is entered.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. by adopting the pressure safety valve, the high-pressure ore pulp exceeding the pressure relief threshold value in the low-pressure pipeline is timely decompressed, so that the damage of low-pressure system equipment of the pipeline caused by severe vibration due to large pressure fluctuation of an ore pulp pipeline system is avoided, the service life of the low-pressure system equipment is prolonged, and safety accidents are prevented;
2. the components in the pressure relief protection device are monitored by designing devices such as a relevant controller, a detector and an alarm, so that the condition that the pressure relief protection device cannot timely relieve pressure to cause accidents due to faults of the pressure relief protection device is avoided, and the stability and the reliability of the pressure relief protection device are improved.
Drawings
Fig. 1 is a schematic structural diagram of a protective device for low-pressure system equipment for ore pulp pipeline transportation;
fig. 2 is a connection schematic diagram of a protection device for low-pressure system equipment for ore pulp pipeline transportation.
The labels in the figure are: 1-pressure relief pipeline, 2-slurry outlet pipeline, 3-pressure safety valve, 4-pressure detector, 5-flow detector, 6-electric control valve, 7-PLC controller, 8-ultrahigh pressure alarm, 9-leakage alarm, 10-feeding pump, 101-first high-pressure ball valve, 102-second high-pressure ball valve, 103-third high-pressure ball valve, 201-ore conveying valve, 202-water conveying valve, 203-feeding pump inlet valve, 204-feeding pump outlet valve, and 205-water inlet valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
As shown in fig. 1 and fig. 2, a protection device for low-pressure system equipment for pulp pipeline transportation comprises a pressure relief pipeline 1, a pressure safety valve 3, a pressure detector 4, a flow detector 5, an electric control valve 6, a PLC controller 7, an ultrahigh pressure alarm 8, a leakage alarm 9, and a pulp outlet pipeline 2 connected between a feed pump 10 and a booster pump of the pulp pipeline transportation system;
the inlet end of the pressure relief pipeline 1 is connected to the slurry outlet pipeline 2 in a closed manner, the outlet end of the pressure relief pipeline is connected into a stirring tank of an ore slurry pipeline conveying system, the electric control valve 6, the flow detector 5 and the pressure safety valve 3 are sequentially arranged in the pressure relief pipeline 1, the electric control valve 6 and the flow detector 5 are positioned close to the inlet end of the pressure relief pipeline 1, and the pressure detector 4 is arranged in the slurry outlet pipeline 2;
the PLC controller 7, the ultrahigh pressure alarm 8 and the leakage alarm 9 are arranged near the pressure relief pipeline 1, and the PLC controller 7 is in circuit connection with the ore pulp pipeline conveying control management center, the pressure safety valve 3, the pressure detector 4, the flow detector 5, the electric control valve 6, the ultrahigh pressure alarm 8 and the leakage alarm 9.
The scheme is that in the existing long-distance ore pulp pipeline conveying system, a pressure relief protection device is added to the pulp outlet pipeline 2 with the largest pressure change, so that the damage to equipment (such as a valve, a feeding pump, a pipeline and the like) of a pipeline low-pressure system caused by high pressure formed in the pipeline instantaneously is reduced. When the pressure relief protection is carried out, the due protection effect cannot be achieved when the conditions that the pressure relief pipeline 1 and the pressure safety valve 3 of the pressure relief protection device are damaged, failed, blocked or damaged and leaked are taken into consideration, so that the flow detector 5, the PLC 7, the ultrahigh pressure alarm 8, the leakage alarm 9 and other parts are additionally arranged in the design and used for monitoring and managing the protection device, and the protection device is ensured to play a role in protecting low-pressure system equipment by pressure relief.
Example 2
As shown in fig. 1 and 2, in addition to embodiment 1, the pressure relief valve 3 further sets a pressure relief threshold; when the pressure in the slurry outlet pipeline 2 is greater than the pressure relief threshold value, the pressure relief valve 3 is opened to relieve the pressure, otherwise, the pressure relief valve 3 is in a closed state.
Further, the electric control valve 6 is controlled to be opened and closed by a PLC (programmable logic controller) 7 and is in a normally open state in use.
The main purpose of setting the electric control valve 6 is to close the inlet of the pressure relief pipeline 1 when the pressure relief valve 3 or the pressure relief pipeline 1 or the like fails, so that maintenance is convenient, and therefore the electric control valve 6 is in an open state in normal use.
Further, the PLC controller 7 timely transmits the detection data of the pressure detector 4 and the flow detector 5 to the ore pulp pipeline transportation control management center, and controls the opening or closing of the electric control valve 6, the ultrahigh pressure alarm 8, and the leakage alarm 9.
In the above steps, the PLC controller 7 is used as a control center of the pressure relief protection device, and is mainly used for managing and controlling related components of the pressure relief protection device, and is responsible for reading data, transmitting information, and analyzing and judging related data to form a control command. And the PLC controller 7 is connected with the ore pulp pipeline conveying control management center to form the coordinated management and control of the whole ore pulp pipeline conveying system, so that the operation of the ore pulp pipeline conveying system is more reliable and stable.
Further, the ultra-high voltage alarm 8 includes a red flashing indicator lamp and an alarm speaker, and the leakage alarm 9 includes a yellow flashing indicator lamp and an alarm speaker.
Further, the pressure relief threshold of the pressure relief valve 3 is 0.28 MPa.
In the foregoing, according to the different requirements of the equipment of ore pulp pipeline transportation low pressure system, can select pressure relief valve 3 that has different pressure release thresholds in the market to install and use.
Example 3
As shown in fig. 1 and fig. 2, on the basis of embodiment 1 and embodiment 2, the present invention further provides a method for protecting a protection device for a pulp pipeline transportation low-pressure system device, as described above, when the pulp pipeline transportation system is started to operate, the steps of protecting the pulp pipeline transportation low-pressure system device are as follows:
s1: when the pressure detector 4 detects that the pressure in the pulp outlet pipeline 2 is greater than the pressure relief threshold value of the pressure relief valve 3, the pressure relief valve 3 is automatically opened to relieve the pressure, the ore pulp flows into the stirring tank through the pressure relief pipeline 1 to be recovered, and if the pressure in the pulp outlet pipeline 2 gradually falls back to be less than the pressure relief threshold value of the pressure relief valve 3 through the pressure relief, the pressure relief valve 3 is automatically closed;
s2: if the pressure detector 4 detects that the pressure in the pulp outlet pipeline 2 is greater than the pressure relief threshold value of the pressure safety valve 3 in the step S1, the pulp conveying operation is stopped when the pressure is continuously increased to a higher value and the pressure does not show a reduction trend, and the protection device is overhauled;
s3: under the condition that the pressure relief is not performed in step S1, if the pressure in the pulp outlet pipe 2 is smaller than the pressure relief threshold of the pressure relief valve 3, the flow detector 5 detects that the pulp in the pressure relief pipe 1 continuously flows, and the electronic control valve 6 is closed, so as to repair the protection device.
Further, the specific processing flow when the pressure in the slurry outlet pipe 2 is continuously increased to a higher value and the pressure does not exhibit a decreasing trend in step S2 is as follows:
s2.1: the PLC controller 7 controls the ultrahigh-voltage alarm 8 to send out red flashing lights and sounds for alarming;
s2.2: when the step S2.1 is implemented, the PLC 7 sends a request for stopping ore pulp conveying operation to the ore pulp pipeline conveying system, and the ore pulp pipeline conveying system timely controls related equipment to stop the ore pulp conveying operation;
s2.3: the PLC 7 sends an instruction to the electric control valve 6 to close the electric control valve 6;
s2.4: when the worker arrives at the site, the pressure safety valve 3 is checked to judge whether the damage is out of order or the blockage is blocked, and corresponding maintenance is carried out;
s2.5: and restarting the ore pulp pipeline conveying system, and controlling the electric control valve 6 to be opened by the PLC 7 to protect the normal operation of the device.
Further, the specific processing flow of the flow detector 5 in step S3 when detecting that the slurry in the pressure relief pipeline 1 continuously flows is as follows:
s3.1: when the PLC controller 7 judges that the flow value measured by the flow detector 5 is continuously larger than 0, the PLC controller 7 controls the leakage alarm 9 to send out yellow flashing lights and sounds for alarming;
s3.2: the PLC 7 sends an instruction to the electric control valve 6 to close the electric control valve 6;
s3.3: when the worker arrives at the site, the protection device is checked, whether the pressure safety valve 3 is damaged and leaked or not and whether the pressure relief pipeline 1 is not well sealed or damaged and leaked or not are judged, and corresponding maintenance is carried out;
s3.4: the staff opens automatically controlled valve 6 through PLC controller 7 manual start-up, and protection device normal operating.
In the above protection method, since the pressure in the slurry outlet pipe 2 continuously increases to a higher value and the pressure does not exhibit a decreasing trend is a time process, in practical use, a value of the time process (which may be simply referred to as a determination time limit value) may be set, and when the process is greater than the determination time limit value, the corresponding process flow may be entered, for example, the determination time limit value is set to 5 minutes, and when the pressure in the slurry outlet pipe 2 continuously increases to a higher value and the pressure does not exhibit a decreasing trend for a duration greater than 5 minutes, the corresponding process flow may be entered.
In addition, in case of damage and leakage of the pressure safety valve 3, poor sealing of the pressure relief pipeline 1 or damage and leakage, because the pulp in the pressure relief pipeline 1 does not flow under normal conditions, but the phenomenon that the pulp in the pressure relief pipeline 1 flows temporarily due to the influence of the inrush current of the pulp outlet pipeline 2 when the pulp pipeline conveying system is started or suspended is not excluded, therefore, in practical use, we can set a flow value duration value (which may be simply referred to as a flow time limit value) measured by the flow detector 5, when the continuous flowing time of the ore pulp in the pressure relief pipeline 1 is longer than the flow time limit value, the corresponding treatment process can be entered, for example, the flow time limit value is set to 30 minutes, when the pulp in the pressure relief pipeline 1 continuously flows for 30 minutes (namely the measured flow value is more than 0 and the time is more than 30 minutes), the pulp enters a corresponding treatment process.
It should be noted that, in the above embodiments 1, 2 and 3, the protection of the pipeline transportation low-pressure system device for ore pulp is based on the long-distance iron concentrate pipeline transportation, the ore pulp pipeline transportation mode switching may generate instantaneous high pressure in the low-pressure pipeline, which causes the damage of the low-pressure system device, and the process of the long-distance ore pulp pipeline transportation is further described as follows:
1. the pipeline conveying medium is ore pulp of iron ore concentrate, when a superior pump station and a booster pump are disconnected for conveying, the first high-pressure ball valve 101 is closed, the water inlet valve 205 is closed, the second high-pressure ball valve 102 and the third high-pressure ball valve 103 are in a normally open state, the ore pulp of the superior pump station enters the stirring tank to be uniformly stirred, the ore pulp is conveyed to the next level after being pressurized by the booster pump by opening the ore conveying valve 201, closing the water conveying valve 202, opening the inlet valve 203 of the feeding pump and opening the outlet valve 204 of the feeding pump, starting the feeding pump 4 and inputting the uniformly stirred ore pulp into the booster pump.
2. When the ore pulp pipeline is used for conveying water, the process water in the clean water tank is conveyed to the feeding pump 10 through the water pump by opening the water conveying valve 202, closing the ore conveying valve 201, opening the inlet valve 203 of the feeding pump and opening the outlet valve 204 of the feeding pump, and the water is conveyed to the next stage after being pressurized by the booster pump after the feeding pump 10 is conveyed to the booster pump.
3. When the ore pulp pipeline conveying mode is switched, the following two situations are divided:
(1) pulp cutting, i.e. switching to conveying water in the case of conveying pulp. And (3) valve operation: firstly, the process water of the clean water tank is conveyed to a water delivery valve 202 through a water pump (not shown in the figure); the water delivery valve 202 is changed from a closed state to an open state; the ore conveying valve 201 is changed from an open state to a closed state; and fourthly, the inlet valve 203 and the outlet valve 204 of the feeding pump are still kept in an open state.
(2) Water slurry switching, i.e. switching to conveying pulp in the case of conveying water. And (3) valve operation: firstly, changing a closing state of an ore conveying valve 201 into an opening state; the water delivery valve 202 is changed from an open state to a closed state; thirdly, the inlet valve 203 and the outlet valve 204 of the feeding pump are still kept in an open state; fourthly, the process water in the clean water tank is stopped to be supplied.
In the switching process of the two conditions, the ore conveying valve 201, the water conveying valve 202, the feeding pump inlet valve 203 and the feeding pump outlet valve 204 are adjusted and then conveyed to the booster pump through the feeding pump 10, and the booster pump pressurizes and conveys water/ore pulp to the next stage pump station.
The above description is only exemplary of the invention, and any modification, equivalent replacement, and improvement made within the spirit and principle of the invention should fall within the protection scope of the invention.
Claims (9)
1. A protection device for ore pulp pipeline transportation low pressure system equipment which characterized in that: the device comprises a pressure relief pipeline (1), a pressure safety valve (3), a pressure detector (4), a flow detector (5), an electric control valve (6), a PLC (programmable logic controller) controller (7), an ultrahigh pressure alarm (8), a leakage alarm (9) and a pulp outlet pipeline (2) connected between a feed pump (10) and a booster pump of an ore pulp pipeline conveying system;
the inlet end of the pressure relief pipeline (1) is connected to the slurry outlet pipeline (2) in a closed mode, the outlet end of the pressure relief pipeline is connected into a stirring tank of an ore pulp pipeline conveying system, the electric control valve (6), the flow detector (5) and the pressure safety valve (3) are sequentially arranged in the pressure relief pipeline (1), the electric control valve (6) and the flow detector (5) are located close to the inlet end of the pressure relief pipeline (1), and the pressure detector (4) is arranged in the slurry outlet pipeline (2);
the automatic ore pulp leakage alarm is characterized in that the PLC (7), the ultrahigh pressure alarm (8) and the leakage alarm (9) are arranged near the pressure relief pipeline (1), and the PLC (7) is in circuit connection with an ore pulp pipeline conveying control management center, the pressure safety valve (3), the pressure detector (4), the flow detector (5), the electric control valve (6), the ultrahigh pressure alarm (8) and the leakage alarm (9).
2. The protection device for the low-pressure system equipment for ore pulp pipeline transportation according to claim 1, characterized in that: the pressure relief valve (3) sets a pressure relief threshold value; when the pressure in the slurry outlet pipeline (2) is larger than the pressure relief threshold value, the pressure relief valve (3) is opened to relieve the pressure, otherwise, the pressure relief valve (3) is in a closed state.
3. The protection device for the low-pressure system equipment for ore pulp pipeline transportation according to claim 2, characterized in that: the electric control valve (6) is controlled to be opened and closed by a PLC (programmable logic controller) (7) and is in a normally open state in use.
4. The protection device for the low-pressure system equipment for ore pulp pipeline transportation is characterized in that: the PLC (7) timely transmits the detection data of the pressure detector (4) and the flow detector (5) to the ore pulp pipeline conveying control management center, and controls the opening or closing of the electric control valve (6), the ultrahigh pressure alarm (8) and the leakage alarm (9).
5. The protection device for the low-pressure system equipment for ore pulp pipeline transportation is characterized in that: the ultrahigh pressure alarm (8) comprises a red flashing indicator light and an alarm loudspeaker, and the leakage alarm (9) comprises a yellow flashing indicator light and an alarm loudspeaker.
6. The protection device for the low-pressure system equipment for ore pulp pipeline transportation is characterized in that: the pressure relief threshold of the pressure relief valve (3) is 0.28 MPa.
7. A protection method using the protection device according to any one of claims 1 to 6, characterized in that: when the ore pulp pipeline conveying system is started to operate, the steps of protecting the ore pulp pipeline conveying low-pressure system equipment are as follows:
s1: when the pressure detector (4) detects that the pressure in the pulp outlet pipeline (2) is greater than the pressure relief threshold value of the pressure relief valve (3), the pressure relief valve (3) is automatically opened to relieve the pressure, ore pulp flows into the stirring tank through the pressure relief pipeline (1) to be recovered, and if the pressure in the pulp outlet pipeline (2) gradually falls back to the pressure relief threshold value smaller than the pressure relief valve (3) through pressure relief, the pressure relief valve (3) is automatically closed;
s2: if the pressure detector (4) in the step S1 detects that the pressure in the pulp outlet pipeline (2) is greater than 0.28MPa, the pressure is continuously increased to a higher value and the pressure does not show a reduction trend, stopping ore pulp conveying operation and overhauling the protection device;
s3: under the condition that the pressure is not released in the step S1, if the pressure in the pulp outlet pipeline (2) is smaller than the pressure release threshold value of the pressure relief valve (3), the flow detector (5) closes the electric control valve (6) when detecting that the ore pulp in the pressure release pipeline (1) continuously flows, and the protection device is overhauled.
8. A protection method of a protection device according to claim 7, characterized in that: the specific processing flow when the pressure in the slurry outlet pipeline (2) is continuously increased to a higher value and the pressure does not show a decreasing trend in the step S2 is as follows:
s2.1: the PLC (7) controls the ultrahigh pressure alarm (8) to give out red flashing lights and sounds for alarming;
s2.2: when the step S2.1 is implemented, the PLC (7) sends a request for stopping ore pulp conveying operation to the ore pulp pipeline conveying system, and the ore pulp pipeline conveying system timely controls related equipment to stop the ore pulp conveying operation;
s2.3: the PLC (7) sends an instruction to the electric control valve (6) to close the electric control valve (6);
s2.4: when the worker arrives at the site, the pressure safety valve (3) is checked to judge whether the pressure safety valve is damaged or fails or blocked, and corresponding maintenance is carried out;
s2.5: and restarting the ore pulp pipeline conveying system, and controlling the electric control valve (6) to be opened by the PLC (7) to protect the normal operation of the device.
9. A protection method of a protection device according to claim 8, characterized in that: the specific processing flow of the flow detector (5) in the step S3 when detecting that the ore pulp in the pressure relief pipeline (1) continuously flows is as follows:
s3.1: when the PLC controller (7) judges that the flow value measured by the flow detector (5) is continuously larger than 0, the PLC controller (7) controls the leakage alarm (9) to emit yellow flashing lights and sounds for alarming;
s3.2: the PLC (7) sends an instruction to the electric control valve (6) to close the electric control valve (6);
s3.3: when the worker arrives at the site, the protection device is checked, whether the pressure safety valve (3) is damaged and leaked or not, whether the pressure relief pipeline (1) is not well sealed or damaged and leaked or not is judged, and corresponding maintenance is carried out;
s3.4: the staff opens the electric control valve (6) through the manual start of PLC controller (7), and the protection device normally operates.
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