A material level alarm system for nitrogen replacement and use method thereof

Abstract

The present invention provides a material level alarm system for nitrogen replacement and a method for using the same. When performing nitrogen replacement, the material level alarm system for nitrogen replacement remotely monitors the pressure impact of the nitrogen filling process on the storage bin, closes the low-pressure side sampling needle valve of the differential pressure transmitter, and opens the low-pressure side sewage discharge needle valve. At this time, the data detected by the differential pressure transmitter is the pressure difference between the external environment and the dust chamber, which is approximately the storage bin pressure, so that the storage bin pressure can be remotely measured. The material level alarm system for nitrogen replacement can judge the fault state and fault range in a short time, and timely handle it to effectively prevent the fault from expanding; and during the replacement of inert gas, the pressure data in the container can be monitored in real time.

Description

Technical Field

[0001] The invention relates to the technical field of coal gasification, and in particular to a material level alarm system for nitrogen replacement and a use method thereof. Background Art

[0002] In recent years, with the improvement of people's living standards, production safety has received more and more attention. In particular, in coal gasification production and pharmaceutical chemical production, a large amount of solvents are often used, such as solvents used in reactors. The addition of solvents brings great safety hazards to production safety, so nitrogen protection must be used in the production process.

[0003] In actual production, nitrogen replacement and release pipelines are often set up in a closed system. When internal nitrogen replacement is required, the nitrogen source enters the reactor from the bottom replacement inlet, and the internal gas is discharged from the release pipeline at the top of the reactor; desulfurization wastewater and dust removal wastewater are treated separately.

[0004] In the existing nitrogen replacement process, the dust removal system only has a differential pressure transmitter, which cannot remotely monitor and implement monitoring of the pressure value during the nitrogen filling process of the reactor (tank). In addition, the data detected by the differential pressure transmitter is the pressure difference between the clean room and the dusty room, and the reactor pressure cannot be measured. The initial state of the level meter is high alarm. When the actual material reaches the installation position of the level meter, the level meter alarm outputs. When there is a problem with the line, the level meter loses power or the level meter is damaged, the level signal cannot be received remotely. At this time, it is impossible to judge: whether there is no level signal because the actual material level does not immerse the installation position of the level meter, or because the level meter loses power or is damaged; signal transmission problems often affect fault judgment and the timeliness of fault discovery, which in turn causes the fault to expand. Therefore, this poses a great safety hazard to normal production. Summary of the invention

[0005] Based on the problems existing in the prior art, the present invention provides a material level alarm system for nitrogen replacement and a method of using the same, which solves the problem that the failure is not discovered in time, resulting in the expansion of the failure and the damage to more instruments.

[0006] According to the first aspect of the technical solution of the present invention, a material level alarm system for nitrogen replacement is provided. When performing nitrogen replacement, the material level alarm system for nitrogen replacement remotely monitors the pressure impact of the material storage bin during the nitrogen filling process, closes the low-pressure side sampling needle valve of the differential pressure transmitter, and opens the low-pressure side sewage discharge needle valve. At this time, the data detected by the differential pressure transmitter is the pressure difference between the external environment and the dust chamber, which is approximately the material storage bin pressure, so that the material storage bin pressure can be remotely measured.

[0007] The material level alarm system for nitrogen replacement includes a differential pressure transmitter, a low-pressure side sampling needle valve, a clean room, a dusty room and a high-pressure side sampling needle valve. The clean room is a clean room where the gas reaches through a filter bag, and the clean room is maintained at a low pressure.

[0008] Among them, the low-pressure side sampling needle valve is installed at the sampling port of the clean room, and the low-pressure side sampling needle valve leads out the medium to be tested on the low-pressure side of the clean room. The dust-containing chamber is a dust-containing chamber directly entered by the gas of the previous process, and the dust-containing chamber is high pressure; the high-pressure side sampling needle valve is installed at the sampling port of the dust-containing chamber, and the high-pressure side sampling needle valve leads out the medium to be tested on the high-pressure side of the dust-containing chamber.

[0009] Preferably, a differential pressure transmitter is installed in the pipeline, which measures the pressure difference between the two chambers obtained by sampling through the low-pressure side sampling needle valve and the high-pressure side sampling needle valve.

[0010] The material level alarm system for nitrogen replacement further includes a signal processing and alarm device, which is connected to both ends of the differential pressure transmitter, and the signal processing and alarm device processes the pressure signal obtained by the differential pressure transmitter, and outputs it to the display device and transmits it to the central control unit. Furthermore, it includes a butt-welding tee, which is used to connect the branch pipeline.

[0011] According to a second aspect of the technical solution of the present invention, a method for using a nitrogen replacement material level alarm system is provided, which comprises the following steps:

[0012] Step S1, setting the initial parameters of the storage bin, ensuring that the instrument pipelines of the differential pressure transmitter, the low-pressure side sampling needle valve, the clean room, the dusty room and the high-pressure side sampling needle valve are unobstructed, using a handheld operator to calibrate the differential pressure transmitter and set the correct range of the differential pressure transmitter;

[0013] Step S2, checking the initial status of each component or assembly of the material level alarm system for nitrogen replacement, and ensuring that each valve in the material level alarm system for nitrogen replacement is in the following status:

[0014] The high-pressure sampling needle valve and the low-pressure side sampling needle valve are in the closed state;

[0015] The high-pressure side drain needle valve and the low-pressure side drain needle valve are in the open state;

[0016] The needle valve introduced on the high-pressure side and the needle valve introduced on the low-pressure side are in the open state;

[0017] Step S3, before the nitrogen replacement process starts, close the low-pressure side sampling needle valve, open the low-pressure side sewage needle valve, open the low-pressure side introduction needle valve, and use the differential pressure transmitter on the low-pressure side to detect the external environmental pressure;

[0018] Step S4, open the sampling needle valve on the high-pressure side, close the drain needle valve on the high-pressure side, open the introduction needle valve on the high-pressure side, and use the transmitter to measure the pressure of the chamber of the silo;

[0019] Step S5, start nitrogen replacement, at which time the differential pressure transmitter measures a value close to the internal pressure of the silo, and the approximate pressure in the silo can be remotely monitored to complete the entire replacement process;

[0020] Step S6: After nitrogen replacement is completed, each valve is restored to the following state:

[0021] The high-pressure sampling needle valve and the low-pressure side sampling needle valve are in the open state;

[0022] The high-pressure side drain needle valve and the low-pressure side drain needle valve are in the closed state;

[0023] The needle valve introduced on the high-pressure side and the needle valve introduced on the low-pressure side are in the open state;

[0024] The storage silo starts normal production, and the differential pressure transmitter measures the differential pressure value between the clean room and the dusty room.

[0025] Furthermore, step S2 further includes using a handheld operator corresponding to the differential pressure transmitter to zero the pressure transmitter.

[0026] Compared with the prior art, the beneficial effects of the material level alarm system for nitrogen replacement of the present invention are:

[0027] 1. Determine the fault status and fault scope in a short time.

[0028] 2. Timely handling can effectively prevent the expansion of faults.

[0029] 3. Real-time monitoring of pressure data inside the container during the inert gas replacement process. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The figure is a schematic diagram of the principle of the material level alarm system for nitrogen replacement according to the present invention.

[0031] Figure 2 This is a schematic diagram of the state where the ash accumulation does not submerge the bottom material level.

[0032] Figure 3 It is a schematic diagram of the state where the ash accumulation submerges the low material level.

[0033] Figure 4 It is a schematic diagram showing the high and low material level states due to the amount of ash accumulated.

[0034] Explanation of the reference numerals in the accompanying drawings: differential pressure transmitter 1, butt-welded straight-through connector 2, stainless steel sampling tube 3, low-pressure side introduction needle valve 4, butt-welded tee 5, low-pressure side sewage needle valve 6, low-pressure side sewage pipe 7, low-pressure side sampling needle valve 8, clean room 9, dust-containing room 10, high-pressure side introduction needle valve 11, high-pressure side sewage needle valve 12, high-pressure side sewage pipe 13, high-pressure side sampling needle valve 14, level meter probe 21, ash amount 22, material storage bin 23, discharge valve 24. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] The present invention provides a material level alarm system for nitrogen replacement. When nitrogen replacement is performed, the pressure effect on the material storage bin during the nitrogen filling process is remotely monitored, the low-pressure side sampling needle valve of the differential pressure transmitter is closed, and the low-pressure side sewage needle valve is opened. At this time, the data detected by the differential pressure transmitter is the pressure difference between the external environment and the dust chamber, which is approximately the pressure of the material storage bin, so that the pressure of the material storage bin can be remotely measured. After the nitrogen replacement, the valve is restored to the normal production state, and the nitrogen replacement is completed.

[0037] A material level alarm system for nitrogen replacement of the present invention comprises a differential pressure transmitter 1, a low-pressure side sampling needle valve 8, a clean room 9, a dust-containing room 10 and a high-pressure side sampling needle valve 14. The clean room 9 is a clean room reached by gas through a filter bag, and the clean room 9 is kept at a low pressure; the low-pressure side sampling needle valve 8 is installed at a sampling port of the clean room 9, and the low-pressure side sampling needle valve 8 leads out a medium to be measured on the low-pressure side of the clean room 9; the dust-containing room 10 is a dust-containing room directly entered by gas from a previous process, and the dust-containing room 10 is at a high pressure; the high-pressure side sampling needle valve 14 is installed at a sampling port of the dust-containing room 10, and the high-pressure side sampling needle valve 14 leads out a medium to be measured on the high-pressure side of the dust-containing room 10; the differential pressure transmitter 1 is installed in a pipeline, and measures the pressure difference between the two chambers obtained by sampling through the low-pressure side sampling needle valve 8 and the high-pressure side sampling needle valve 14.

[0038] Furthermore, a material level alarm system for nitrogen replacement includes a signal processing and alarm device, which is connected to both ends of the differential pressure transmitter 1. The signal processing and alarm device processes the pressure signal obtained by the differential pressure transmitter 1, and outputs it to the display device and transmits it to the central control unit. Preferably, when the pressure difference is greater than the set threshold, the signal processing and alarm device alarms, preferably including sound and light alarms, and further includes cutting off material filling and processing to avoid further expansion of losses. The differential pressure transmitter measures the differential pressure from the double-sided pressure pipes. The pressure difference directly acts on the isolation diaphragms on both sides of the differential pressure transmitter sensor, and is transmitted to the measuring element through the sealing liquid in the diaphragm. The measuring element converts the measured differential pressure signal into an electrical signal corresponding to it and transmits it to the signal processing and alarm device, which is converted into a standard electrical signal output after amplification and other processing. In another embodiment, the differential pressure transmitter 1 is combined with a throttling element, and the liquid flow rate is measured using the differential pressure value generated before and after the throttling element. The performance indicators of the differential pressure transmitter in this embodiment are as follows: accuracy can reach 0.075%, range ratio 100:1, differential pressure: adjustment range from 4inH2O to 1000psi, gauge pressure: adjustment range from 4inH2O to 1000psi, absolute pressure: adjustment range from 150inH2O to 1000psi.

[0039] In a preferred embodiment, a material level alarm system for nitrogen replacement further includes a butt-welded tee 5, which is used to connect the branch pipeline; further, a first butt-welded tee is respectively arranged on the outside of the low-pressure side sampling needle valve 8 (the side away from the clean room 9), and a second butt-welded tee is arranged on the outside of the high-pressure side sampling needle valve 14 (the side away from the dust chamber 10). The first butt-welded tee is connected to the low-pressure side drain pipe 7 via the low-pressure side drain needle valve 6, and the second butt-welded tee is connected to the high-pressure side drain pipe 13 via the high-pressure side drain needle valve 12.

[0040] The low-pressure side sewage discharge needle valve 6 is used to open the low-pressure side of the valve to start sewage discharge, and the low-pressure side sewage discharge pipe 7 is used to remove impurities that clog the pipeline. The high-pressure side sewage discharge needle valve 12 is used to open the high-pressure side of the valve to start sewage discharge, and the high-pressure side sewage discharge pipe 13 is used to remove impurities that clog the pipeline. In the embodiment of the present invention, a micro-flow needle valve is selected as the valve instead of the ball valve commonly used in this industry. The advantage is that the needle valve is easy to install and disassemble, has a tight connection, is conducive to fire prevention, explosion prevention and high pressure resistance, has good sealing performance, and has a long service life. In particular, the needle valve has good sealing performance. Even if the sealing surface is damaged, only the wearing parts need to be replaced before it can continue to be used.

[0041] In a further embodiment, a butt-welded straight-through joint 2 is installed at both ends of the differential pressure transmitter 1, a stainless steel sampling tube 3 and a low-pressure side introduction needle valve 4 are arranged between the first butt-welded tee and the differential pressure transmitter 1, and a stainless steel sampling tube 3 and a high-pressure side introduction needle valve 11 are arranged between the second butt-welded tee and the differential pressure transmitter 1.

[0042] The butt-welded straight-through connector is used to connect the differential pressure transmitter with the stainless steel sampling tube, which is used to lead out the medium to be measured. The needle valve introduced on the low-pressure side is used to cut off the low-pressure gas line and introduce the medium to be measured into the differential pressure transmitter. The needle valve introduced on the high-pressure side is used to cut off the high-pressure gas line and introduce the medium to be measured into the differential pressure transmitter.

[0043] The material level alarm system for nitrogen replacement of the present invention is used for alarm detection in the initial stage of material level installation and detection during the production process. In the initial stage of installation, since no material is produced, the actual material level is in a low state. The material level alarm system for nitrogen replacement will remotely receive the material level meter alarm signal; if a certain material level signal disappears, there are three possibilities: the material level meter loses power, the line fails, or the material level meter is damaged. The material level alarm system for nitrogen replacement can detect the problem in time. During the production process, under normal circumstances, the actual material will not submerge the material level meter (low alarm); since the high material level is an abnormal state, when the actual material reaches the installation position of the material level meter, the high material level signal disappears (low alarm), the ash conveying system is started, and the material level signal will recover after a certain period of time. If the material level signal does not change after a period of time, the material level alarm system for nitrogen replacement can determine that the material level meter is abnormal and needs to be checked in time. Specifically, Figure 2 , Figure 3 and Figure 4 shown.

[0044] Figure 2 This is a schematic diagram of the state where the ash accumulation does not submerge the bottom material level. Figure 3 This is a schematic diagram of the state where the ash accumulation submerges the low material level. Figure 4 It is a schematic diagram showing the high and low material level states due to the amount of ash accumulated.

[0045] like Figure 2 As shown, the ash accumulation does not overwhelm the bottom material level. In the storage bin 23, the low material level L1 indicates the lower limit position of the ash accumulation in the ash hopper, and the high material level L2 is used to indicate the upper limit position of the ash accumulation in the ash hopper. The effective length of the level meter probe 21 is used to detect the ash accumulation position. Figure 2 As shown, the ash volume 22 generated during the production process is below the low material level L1 of the ash hopper ash accumulation lower limit position. The device of this embodiment uses a discharge valve 24 to discharge the accumulated ash during the production process. The discharge valve 24 is installed at the bottom of the storage bin 23.

[0046] like Figure 3As shown in FIG. 1 , the ash accumulation exceeds the low material level L1 and is lower than the high material level L2. Figure 4 As shown, the ash accumulation amount overwhelms the high and low material level states, and the ash accumulation amount in the storage bin 23 exceeds the high material level L2.

[0047] The method for using the nitrogen replacement material level alarm system of the present invention is as follows, which comprises the following steps:

[0048] Step S1, setting the initial parameters of the storage bin, ensuring that the instrument pipelines of the differential pressure transmitter 1, the low-pressure side sampling needle valve 8, the clean room 9, the dust-containing room 10 and the high-pressure side sampling needle valve 14 are unobstructed, using a handheld operator to calibrate the differential pressure transmitter 1 and set the correct range of the differential pressure transmitter;

[0049] Step S2, checking the initial status of each component or assembly of the material level alarm system for nitrogen replacement, and ensuring that each valve in the material level alarm system for nitrogen replacement is in the following status:

[0050] The high-pressure sampling needle valve and the low-pressure side sampling needle valve are in the closed state.

[0051] The high-pressure side drain needle valve and the low-pressure side drain needle valve are in the open state.

[0052] The needle valve on the high-pressure side and the needle valve on the low-pressure side are in the open state.

[0053] Use the handheld operator corresponding to the differential pressure transmitter to zero the pressure transmitter.

[0054] Step S3, before the nitrogen replacement process starts, close the low-pressure side sampling needle valve, open the low-pressure side sewage needle valve, open the low-pressure side introduction needle valve, and use the differential pressure transmitter on the low-pressure side to detect the external environmental pressure;

[0055] Step S4, open the sampling needle valve on the high-pressure side, close the drain needle valve on the high-pressure side, open the introduction needle valve on the high-pressure side, and use the transmitter to measure the pressure of the chamber of the silo;

[0056] Step S5, start nitrogen replacement. At this time, the measurement value of the differential pressure transmitter is close to the internal pressure of the silo. At this time, the approximate pressure in the silo can be remotely monitored to complete the entire replacement process.

[0057] Step S6: After nitrogen replacement is completed, each valve is restored to the following state:

[0058] The high-pressure sampling needle valve and the low-pressure side sampling needle valve are in the open state;

[0059] The high-pressure side drain needle valve and the low-pressure side drain needle valve are in the closed state;

[0060] The needle valve introduced on the high-pressure side and the needle valve introduced on the low-pressure side are in the open state;

[0061] The storage silo starts normal production, and the differential pressure transmitter measures the differential pressure value between the clean room and the dusty room.

[0062] Furthermore, the material level alarm system for nitrogen replacement realizes the material level alarm, which includes the following steps:

[0063] Step W1, setting the parameters of the level meter for the low material level L1 and the level meter for the high material level L2 to low alarm, that is, an alarm is generated when the material does not submerge the level meter probe rod 21;

[0064] Step W2, during the production process, when the dust accumulation is lower than the low material level L1, both the high material level and the low material level generate an alarm state and are transmitted to the central control platform. The central control platform receives the material level signal indicating that each instrument is normal.

[0065] Step W3, when the central control platform fails to receive the material level signal, there are two possibilities: (1) the material or ash accumulation in the silo exceeds the low material level L1 and is lower than the high material level L2; (2) the instrument circuit is abnormal or damaged;

[0066] Step W4, in order to verify the possibility in step W3, open the discharge valve 24 to start discharging. If the level meter recovers after several rounds of discharging, it means that the meter is accurate. Otherwise, the meter is damaged and should be repaired in time to prevent the scope of the fault from expanding.

[0067] Based on the embodiments of the present invention, ordinary technicians in this field can make various modifications in form and details without departing from the technical principles of the present invention, all of which belong to the scope of protection of the present invention. In addition, the scope of protection of the present invention should not be limited to the following specific structures or components or specific parameters.

Claims

1. A material level alarm system for nitrogen replacement, characterized in that: When the material level alarm system for nitrogen replacement is performing nitrogen replacement, the pressure impact on the material storage bin during the nitrogen filling process is remotely monitored, the low-pressure side sampling needle valve of the differential pressure transmitter is closed, and the low-pressure side sewage discharge needle valve is opened. At this time, the data detected by the differential pressure transmitter is the pressure difference between the external environment and the dust chamber, which is approximately the pressure of the material storage bin, thereby remotely measuring the pressure of the material storage bin; The material level alarm system for nitrogen replacement includes a differential pressure transmitter, a low-pressure side sampling needle valve, a clean room, a dust-containing room, a high-pressure side sampling needle valve, and a signal processing and alarm device. The clean room is a clean room where the gas reaches through the filter bag, and the clean room is kept at a low pressure; the low-pressure side sampling needle valve is installed at the sampling port of the clean room, and the low-pressure side sampling needle valve leads out the medium to be tested on the low-pressure side of the clean room; the dust-containing room is a dust-containing room where the gas of the previous process directly enters, and the dust-containing room is at a high pressure; the high-pressure side sampling needle valve is installed at the sampling port of the dust-containing room, and the high-pressure side sampling needle valve leads out the medium to be tested on the high-pressure side of the dust-containing room; The differential pressure transmitter is installed in the pipeline, which measures the pressure difference between the two chambers obtained by sampling through the low-pressure side sampling needle valve and the high-pressure side sampling needle valve.

2. A material level alarm system for nitrogen replacement according to claim 1, characterized in that: The signal processing and alarm device is connected to both ends of the differential pressure transmitter. The signal processing and alarm device processes the pressure signal obtained by the differential pressure transmitter, outputs it to the display device and transmits it to the central control unit.

3. A material level alarm system for nitrogen replacement according to claim 2, characterized in that: It further comprises a butt-welding type tee, which is used for connecting branch pipelines.

4. A material level alarm system for nitrogen replacement according to claim 2, characterized in that: When the pressure difference is greater than the set threshold, the signal processing and alarm device will sound an alarm.

5. A material level alarm system for nitrogen replacement according to claim 2, characterized in that: A first butt-welded tee is arranged outside the low-pressure side sampling needle valve, and a second butt-welded tee is arranged outside the high-pressure side sampling needle valve. The first butt-welded tee is connected to the low-pressure side sewage pipe via the low-pressure side sewage needle valve, and the second butt-welded tee is connected to the high-pressure side sewage pipe via the high-pressure side sewage needle valve.

6. A method for using the nitrogen replacement material level alarm system according to any one of claims 1 to 5, comprising the following steps: Step S1, setting the initial parameters of the storage bin, ensuring that the instrument pipelines of the differential pressure transmitter, the low-pressure side sampling needle valve, the clean room, the dusty room and the high-pressure side sampling needle valve are unobstructed, using a handheld operator to calibrate the differential pressure transmitter and set the correct range of the differential pressure transmitter; Step S2, checking the initial status of each component or assembly of the material level alarm system for nitrogen replacement, and ensuring that each valve in the material level alarm system for nitrogen replacement is in the following status: The high-pressure sampling needle valve and the low-pressure side sampling needle valve are in the closed state; the high-pressure side sewage discharge needle valve and the low-pressure side sewage discharge needle valve are in the open state; The needle valve introduced on the high-pressure side and the needle valve introduced on the low-pressure side are in the open state; Step S3, before the nitrogen replacement process starts, close the low-pressure side sampling needle valve, open the low-pressure side sewage needle valve, open the low-pressure side introduction needle valve, and use the differential pressure transmitter on the low-pressure side to detect the external environmental pressure; Step S4, open the sampling needle valve on the high-pressure side, close the drain needle valve on the high-pressure side, open the introduction needle valve on the high-pressure side, and use the transmitter to measure the pressure of the chamber of the silo; Step S5, start nitrogen replacement, at which time the differential pressure transmitter measures a value close to the internal pressure of the silo, and the approximate pressure in the silo can be remotely monitored to complete the entire replacement process; Step S6: After nitrogen replacement is completed, each valve is restored to the following state: The high-pressure sampling needle valve and the low-pressure side sampling needle valve are in the open state; The high-pressure side drain needle valve and the low-pressure side drain needle valve are in the closed state; The needle valve introduced on the high-pressure side and the needle valve introduced on the low-pressure side are in the open state; The storage silo starts normal production, and the differential pressure transmitter measures the differential pressure value between the clean room and the dusty room.

7. The method for using the nitrogen replacement material level alarm system according to claim 6, characterized in that: Step S2 further includes using a handheld operator corresponding to the differential pressure transmitter to zero the pressure transmitter.

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