CN104932561A - Synthetic gas washing tower liquid level control system and control method thereof - Google Patents
Synthetic gas washing tower liquid level control system and control method thereof Download PDFInfo
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- CN104932561A CN104932561A CN201510218011.1A CN201510218011A CN104932561A CN 104932561 A CN104932561 A CN 104932561A CN 201510218011 A CN201510218011 A CN 201510218011A CN 104932561 A CN104932561 A CN 104932561A
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Abstract
The invention relates to a synthetic gas washing tower liquid level control system, comprising a liquid level transmitter, a liquid level operation module, a liquid level indication module, a first liquid level regulating valve, a first liquid level controller, a second liquid level regulating valve, and a second liquid level controller. The invention also relates to a control method of the synthetic gas washing tower liquid level control system, which can realize interlock switching between the first liquid level regulating valve and the second liquid level regulating valve under different pressure operating conditions, thereby substantially reducing the operating pressure difference of the first liquid level regulating valve, and eliminating cavitation erosion in operating processes. Meanwhile the liquid level automatic control commissioning rate of the synthetic gas washing tower liquid level control system is high, thereby effectively improving the stability and reliability of washing tower liquid level control, reducing apparatus non-planned parking, facilitating operation, and reducing operation cost and maintenance workload.
Description
Technical field
The present invention relates to a kind of synthesis gas washing tower tank level control system, the invention still further relates to a kind of control method of synthesis gas washing tower liquid level.
Background technology
Scrubbing tower is a kind of process unit for removing entrained solid particle in crude synthesis gas, the crude synthesis gas of usual gasification furnace output delivers to the process unit delivering to downstream in scrubbing tower after washing, the washings of discharging from scrubbing tower side are then delivered to as chilled water in the shock chamber of gasification furnace after the pressurization of Quench water pump, and further treatment for reuse in flash tank is then delivered in the Heisui River of discharging at the bottom of scrubbing tower tower.In the operational process of scrubbing tower, maintain the stable of scrubbing tower liquid level by constantly filling into fresh water (FW).If there is the situation that scrubbing tower liquid level is too low, Quench water pump will be caused to run, and then trigger gasification furnace jumping car, affect the normal production run of device.When situation is serious, synthetic gas even may be caused to enter in flash tank, cause serious potential safety hazard and environmental hazard.If there is the situation that scrubbing tower liquid level is too high, will synthesis gas washing effect be affected, affect the even running of downstream process device.Therefore, the Liquid level of scrubbing tower is most important to the safety of coal gasification apparatus, stable operation.
In existing technology, fresh water (FW) pipeline is provided with the Liquid level of a scrubbing tower Liquid level adjusting valve for scrubbing tower.Under normal production run state, scrubbing tower pressure is design operation pressure.And in coal gasification apparatus startup procedure, scrubbing tower pressure boosts to design operation pressure gradually from normal pressure.So, this Liquid level adjusting valve needs the pressure reduction born gradually by reducing greatly in startup procedure.Usually this startup procedure needs to continue about 40 ~ 80 minutes, therefore has long period of time Liquid level adjusting valve to need to bear larger pressure reduction, and variable valve like this is easy to produce and cavitates.Existing technology selects Globe valve (stop valve), core shift rotary valve (caimflex valve), V-type ball valve as scrubbing tower Liquid level adjusting valve usually, the valve of these kinds is easy to damage because of cavitation, also cannot bear washing away for a long time and denuding of solid particle in fresh water (FW) medium.Variable valve, once damage, certainly will affect the Liquid level of scrubbing tower, cause coal gasification apparatus to stop, and affects downstream unit and runs.After variable valve damages, need dismounting valve, change trim, also will increase plant running cost and maintenance workload.
Authorization Notice No. is the Chinese utility model patent " scrubbing tower level sensing control device " of CN202548656U (application number is 201220058110.X), the level sensing of scrubbing tower disclosed in it control device adopts PLC to be connected respectively with gas pressure sensor, fluid level transmitter, thus achieves the detection control to scrubbing tower liquid level.But this control device can not solve pressure reduction problem.
Summary of the invention
First technical matters to be solved by this invention provides a kind of synthesis gas washing tower tank level control system that can effectively avoid Liquid level adjusting valve to damage for above-mentioned prior art.
Second technical matters to be solved by this invention be for above-mentioned prior art provide a kind of effectively can improve scrubbing tower Liquid level stability and reliability, the unplanned parking of minimizing device, simple operation, operating cost is low, maintenance workload is little synthesis gas washing tower liquid level control method.
The present invention solves the technical scheme that above-mentioned first problem adopts: a kind of synthesis gas washing tower tank level control system, the liquid level computing module comprise the fluid level transmitter be connected on scrubbing tower, being connected with described fluid level transmitter, is characterized in that: also include the first Liquid level adjusting valve worked under high pressure operating mode, the second Liquid level adjusting valve worked under low pressure operating mode, the first fluid level controller and the second fluid level controller;
Described first Liquid level adjusting valve and the second Liquid level adjusting valve are connected in fresh water (FW) in parallel and inject on the pipeline of scrubbing tower, for the flow of adjusting process water;
Described first fluid level controller is connected with liquid level computing module with the first Liquid level adjusting valve respectively, for controlling the aperture of the first Liquid level adjusting valve;
Described second fluid level controller is connected with liquid level computing module with the second Liquid level adjusting valve respectively, for controlling the aperture of the second Liquid level adjusting valve.
Level condition conveniently in monitor wash tower, this synthesis gas washing tower tank level control system also comprises the liquid level indicating module be connected with the communication of upper monitoring machine, and described liquid level indicating module is connected with liquid level computing module.
Pressure state conveniently in monitor wash tower, this synthesis gas washing tower tank level control system also comprises the pressure unit be connected on scrubbing tower, the pressure indicating module be connected with described pressure unit, described pressure indicating module is connected with the communication of upper monitoring machine.
In order to realize the accurate control of liquid level in scrubbing tower, described first fluid level controller and the second fluid level controller are PID controller.
Preferably, described fluid level transmitter comprises the first fluid level transmitter, the second fluid level transmitter and the 3rd fluid level transmitter, and described first fluid level transmitter, the second fluid level transmitter are connected with described liquid level computing module respectively with the 3rd fluid level transmitter.
Preferably, described first Liquid level adjusting valve is that side is entered the end and to be gone out or the end is entered side and goes out formula angle valve, and described second Liquid level adjusting valve is that side is entered the end and to be gone out or the end is entered side and goes out formula multilevel decompression type angle valve.
The present invention solves the technical scheme that above-mentioned Second Problem adopts: a kind of control method of synthesis gas washing tower tank level control system, it is characterized in that: first the first switching pressure of the first Liquid level adjusting valve under different pressures operating mode is set, the second switching pressure of the second Liquid level adjusting valve under different pressures operating mode is set, the ratio that wherein the first ratio and second switching pressure and scrubbing tower design operation pressure switches pressure and scrubbing tower design operation pressure is 60% ~ 75%, and the first switching force value is greater than the second switching force value;
When the pressure of scrubbing tower switches pressure lower than second, second fluid level controller and the second Liquid level adjusting valve are in automatic control state, second fluid level controller controls the aperture of the second Liquid level adjusting valve with the flow of Controlling Technology water, and the first fluid level controller and the first Liquid level adjusting valve are in closed condition;
When the pressure of scrubbing tower switches pressure higher than first, first fluid level controller and the first Liquid level adjusting valve are in automatic control state, first fluid level controller controls the aperture of the first Liquid level adjusting valve with the flow of Controlling Technology water, and the second fluid level controller and the second Liquid level adjusting valve are in closed condition;
In scrubbing tower boost process, when the pressure of scrubbing tower is elevated to the first switching pressure, second fluid level controller and the second Liquid level adjusting valve still maintain automatic control state, the first fluid level controller and the first Liquid level adjusting valve are switched to MANUAL CONTROL mode simultaneously; Then the aperture of the first Liquid level adjusting valve is tuned up gradually, simultaneously the second fluid level controller controls the second Liquid level adjusting valve and turns down until complete shut-down gradually, then the second fluid level controller and the second Liquid level adjusting valve are switched to closed condition, then the first fluid level controller and the first Liquid level adjusting valve are switched to automatic control mode;
Or control the second fluid level controller and the second Liquid level adjusting valve work by upper monitoring machine DCS system to switch to the automatic interlock of the work of the first fluid level controller and the first Liquid level adjusting valve;
In scrubbing tower pressure reduction, when the pressure drop of scrubbing tower switches pressure to second, the first fluid level controller and the first Liquid level adjusting valve maintain automatic control state, the second fluid level controller and the second Liquid level adjusting valve are switched to MANUAL CONTROL mode simultaneously; Then the aperture of the second Liquid level adjusting valve is tuned up gradually, simultaneously the first fluid level controller controls the first Liquid level adjusting valve and turns down until complete shut-down gradually, then the first fluid level controller and the first Liquid level adjusting valve are switched to closed condition, then the second fluid level controller and the second Liquid level adjusting valve are switched to automatic control mode;
Or control the first fluid level controller and the first Liquid level adjusting valve work by upper monitoring machine DCS system to switch to the automatic interlock of the work of the second fluid level controller and the second Liquid level adjusting valve.
Compared with prior art, the invention has the advantages that: this synthesis gas washing tower tank level control system adopts the first Liquid level adjusting valve and the second Liquid level adjusting valve under high pressure operating mode and low pressure operating mode, to carry out work respectively, thus corresponding and the first fluid level controller and the second fluid level controller form two independently simple control loops respectively, utilize the control method of this synthesis gas washing tower tank level control system conveniently can realize the first Liquid level adjusting valve and the switch operating of the second Liquid level adjusting valve under high pressure operating mode and low pressure operating mode simultaneously, substantially reduce the operting differential pressure of the first Liquid level adjusting valve, eliminate the cavitation occurred in the course of work.This control method makes the automatic control of liquid of the synthesis gas washing tower tank level control system rate that comes into operation high simultaneously, makes scrubbing tower Liquid level more stable, reliable, thus the operation that coal gasification apparatus can be safer, stable.This blocked operation is convenient in addition, and operator's labour intensity is low.In addition, the first Liquid level adjusting valve adopts side to enter the end to go out or the end is entered side and goes out formula angle valve, can resist washing away and denuding of solid particle in fresh water (FW) medium.And the second Liquid level adjusting valve is side enters the end and to go out or the end is entered side and goes out formula multilevel decompression type angle valve, the cavitation that High Pressure Difference causes before and after low pressure operating mode lower valve can be eliminated.So effectively prevent the damage of Liquid level adjusting valve door, improve stability and the reliability of scrubbing tower Liquid level, reduce the unplanned parking of device, reduce plant running cost, reduce maintenance workload.
Accompanying drawing explanation
Fig. 1 is the structural representation of synthesis gas washing tower tank level control system in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
As shown in Figure 1, synthesis gas washing tower tank level control system in the present embodiment, comprises fluid level transmitter 2, liquid level computing module 3, liquid level indicating module 8, first Liquid level adjusting valve 4, first fluid level controller 6, second Liquid level adjusting valve 5, second fluid level controller 7, pressure unit 91 and pressure indicating module 92.
Wherein fluid level transmitter 2 comprises the first fluid level transmitter 21 be connected on scrubbing tower 1, second fluid level transmitter 22 and the 3rd fluid level transmitter 23, first fluid level transmitter 21, second fluid level transmitter 22 is connected with described liquid level computing module 3 respectively with the 3rd fluid level transmitter 23, operationally, first fluid level transmitter 21, second fluid level transmitter 22 and the 3rd fluid level transmitter 23 gather the real-time level data in scrubbing tower 1 respectively, and liquid level data is sent in liquid level computing module 3, computing method during liquid level computing module 3 adopts three to get obtain current liquid level data.
Liquid level indicating module 8 is connected with liquid level computing module 3, and be connected with the communication of upper monitoring machine, liquid level indicating module 8 reads the liquid level data in liquid level computing module 3 after computing, upload in upper monitoring machine, then staff can obtain the real-time level situation of scrubbing tower 1 in upper monitoring machine simultaneously.
First Liquid level adjusting valve 4 and the second Liquid level adjusting valve 5 are connected in fresh water (FW) in parallel and inject on the pipeline of scrubbing tower 1, for the flow of adjusting process water.Namely the first Liquid level adjusting valve 4 and the two ends of the second Liquid level adjusting valve 5 are connected the water delivering orifice of scrubbing tower 1 and fresh water (FW) respectively.
First Liquid level adjusting valve 4 is selected side to enter the end to go out or the end is entered side and goes out formula angle valve, to resist washing away and denuding of solid particle in fresh water (FW) medium, thus avoids valve to damage.Under this first Liquid level adjusting valve 4 works in the high pressure operating mode of scrubbing tower 1, first fluid level controller 6 is connected with the first Liquid level adjusting valve 4, for controlling the aperture of the first Liquid level adjusting valve 4, thus control the flow flowing into fresh water (FW) in scrubbing tower 1 from the first Liquid level adjusting valve 4.
First fluid level controller 6 is PID controller, before use, staff is input control target set point in the first fluid level controller 6, then in use, the current level data of acquisition are sent in the first fluid level controller 6 by liquid level computing module 3, as the process measurements in the first fluid level controller 6 computation process.Then through the PID arithmetic process of the first fluid level controller 6, the accurate control to the first Liquid level adjusting valve 4 aperture under high pressure operating mode can be realized.
Second Liquid level adjusting valve 5 is selected side to enter the end to go out or the end is entered side and goes out formula multilevel decompression type angle valve, to eliminate the cavitation that High Pressure Difference causes before and after low pressure operating mode lower valve, thus avoid valve to damage.Under this second Liquid level adjusting valve 5 works in the low pressure operating mode of scrubbing tower 1, second fluid level controller 7 is connected with the second Liquid level adjusting valve 5, for controlling the aperture of the second Liquid level adjusting valve 5, thus control the flow flowing into fresh water (FW) in scrubbing tower 1 from the second Liquid level adjusting valve 5.
Second fluid level controller 7 adopts PID controller equally, before use, staff is input control target set point in the second fluid level controller 7, then in use, the current level data of acquisition are sent in the second fluid level controller 7 by liquid level computing module 3, as the process measurements in the second fluid level controller 7 computation process.Then through the PID arithmetic process of the second fluid level controller 7, the accurate control to the second Liquid level adjusting valve 5 aperture under low pressure operating mode can be realized.
Pressure unit 91 is connected on scrubbing tower 1 to obtain the pressure data in scrubbing tower 1, pressure indicating module 92 is connected with this pressure unit 91, and pressure indicating module 92 is also connected with the communication of upper monitoring machine, then the pressure data information obtained in pressure unit 91 uploads in upper monitoring machine for the pressure condition in staff's Remote Acquisitioning scrubbing tower 1 by pressure indicating module 92.
The control method of the synthesis gas washing tower tank level control system in the present embodiment is as follows: first arrange the first switching pressure of the first Liquid level adjusting valve 4 under different pressures operating mode, the second switching pressure of the second Liquid level adjusting valve 5 under low pressure operating mode and high pressure operating mode is set, the wherein ratio of the first switching pressure and scrubbing tower 1 design operation pressure, and second the ratio switching pressure and scrubbing tower 1 design operation pressure be 60% ~ 75%, and the first switching force value is greater than the second switching force value, in the present embodiment, first ratio switching pressure and scrubbing tower 1 design operation pressure is 70%, second ratio switching pressure and scrubbing tower 1 design operation pressure is 65%.
In the startup procedure of scrubbing tower 1, the pressure in scrubbing tower 1 is the process raised gradually, and the pressure that the pressure in scrubbing tower 1 reaches standard operational process needed through one long period.Correspondingly, in the docking process of scrubbing tower 1, the pressure in scrubbing tower 1 declines gradually, and it also needs a period of time to complete parking.
In the course of work of scrubbing tower 1, the pressure data that monitor staff can transmit according to pressure indicating module 92, the pressure condition in real-time monitor wash tower 1.
When the pressure of scrubbing tower 1 switches pressure lower than second, the second fluid level controller 7 and the second Liquid level adjusting valve 5 is made to be in automatic control state, second fluid level controller 7 controls the aperture of the second Liquid level adjusting valve 5 with the flow of Controlling Technology water, and the first fluid level controller 6 and the first Liquid level adjusting valve 4 are in closed condition.
When the pressure of scrubbing tower 1 switches pressure higher than first, the first fluid level controller 6 and the first Liquid level adjusting valve 4 is made to be in automatic control state, first fluid level controller 6 controls the aperture of the first Liquid level adjusting valve 4 with the flow of Controlling Technology water, and the second fluid level controller 7 and the second Liquid level adjusting valve 5 are in closed condition.
In the boost process that scrubbing tower 1 is driven, when the pressure of scrubbing tower 1 is elevated to the first switching pressure, second fluid level controller 7 and the second Liquid level adjusting valve 5 still maintain automatic control state, the first fluid level controller 6 and the first Liquid level adjusting valve 4 are switched to MANUAL CONTROL mode simultaneously; Then the aperture of the first Liquid level adjusting valve 4 is tuned up gradually, simultaneously the second fluid level controller 7 controls the second Liquid level adjusting valve 5 and turns down until complete shut-down gradually, then the second fluid level controller 7 and the second Liquid level adjusting valve 5 are switched to closed condition, then the first fluid level controller 6 and the first Liquid level adjusting valve 4 are switched to automatic control mode.So go to the situation of high pressure operating mode in low pressure operating mode, the first Liquid level adjusting valve 4 and the second Liquid level adjusting valve 5 can complete switching smoothly, and do not affect the normal work of scrubbing tower 1.In the process simultaneously, substantially reduce the operting differential pressure that the first Liquid level adjusting valve 4 bears, avoid cavitation, and the second Liquid level adjusting valve 5 enters the end for side goes out or the end is entered side and goes out formula multilevel decompression type angle valve, the cavitation erosion that large operting differential pressure may cause can be eliminated, effectively protect the first Liquid level adjusting valve 4 and the second Liquid level adjusting valve 5, add the serviceable life of the first Liquid level adjusting valve 4 and the second Liquid level adjusting valve 5, improve stability and the reliability of scrubbing tower 1 Liquid level, reduce the unplanned parking because damage parts causes, reduce the operating cost of whole scrubbing tower 1, reduce maintenance workload.
In the pressure reduction that scrubbing tower 1 stops, when the pressure drop of scrubbing tower 1 switches pressure to second, first fluid level controller 6 and the first Liquid level adjusting valve 4 maintain automatic control state, the second fluid level controller 7 and the second Liquid level adjusting valve 5 are switched to MANUAL CONTROL mode simultaneously; Then the aperture of the second Liquid level adjusting valve 5 is tuned up gradually, simultaneously the first fluid level controller 6 controls the first Liquid level adjusting valve 4 and turns down until complete shut-down gradually, then the first fluid level controller 6 and the first Liquid level adjusting valve 4 are switched to closed condition, then the second fluid level controller 7 and the second Liquid level adjusting valve 5 are switched to automatic control mode.So complete the switching of the first Liquid level adjusting valve 4 and the second Liquid level adjusting valve 5 smoothly; protect the first Liquid level adjusting valve 4 and the second Liquid level adjusting valve 5 equally; add the serviceable life of the first Liquid level adjusting valve 4 and the second Liquid level adjusting valve 5; improve stability and the reliability of scrubbing tower 1 Liquid level; reduce the unplanned parking because damage parts causes; reduce the operating cost of whole scrubbing tower 1, reduce maintenance workload.
Said process, monitor staff can be completed by liquid level that host computer shows and pressure information manual operation.Said process can also control the first fluid level controller 6 and the second fluid level controller 7 by upper monitoring machine DCS system, thus the automatic interlock realizing the first Liquid level adjusting valve 4 and the second Liquid level adjusting valve 5 switches, and automatic interlock changeover program can select automatic interlock changing method program of the prior art, to realize the automatic control of the first Liquid level adjusting valve 4 and the switching of the second Liquid level adjusting valve 5.
Claims (4)
1. a synthesis gas washing tower tank level control system, the liquid level computing module (3) comprise the fluid level transmitter (2) be connected on scrubbing tower (1), being connected with described fluid level transmitter (2), is characterized in that: also include the first Liquid level adjusting valve (4) worked under high pressure operating mode, the second Liquid level adjusting valve (5) worked under low pressure operating mode, the first fluid level controller (6) and the second fluid level controller (7);
Described first Liquid level adjusting valve (4) and the second Liquid level adjusting valve (5) are connected in fresh water (FW) in parallel and inject on the pipeline of scrubbing tower (1), for the flow of adjusting process water;
Described first fluid level controller (6) is connected with liquid level computing module (3) with the first Liquid level adjusting valve (4) respectively, for controlling the aperture of the first Liquid level adjusting valve (4);
Described second fluid level controller (7) is connected with liquid level computing module (3) with the second Liquid level adjusting valve (5) respectively, for controlling the aperture of the second Liquid level adjusting valve (5).
2. synthesis gas washing tower tank level control system according to claim 1, is characterized in that: described first fluid level controller (6) and the second fluid level controller (7) are PID controller.
3. synthesis gas washing tower tank level control system according to claim 1, it is characterized in that: described first Liquid level adjusting valve (4) is entered the end for side and to be gone out or the end is entered side and goes out formula angle valve, described second Liquid level adjusting valve (5) is entered the end for side and to be gone out or the end is entered side and goes out formula multilevel decompression type angle valve.
4. the control method of the synthesis gas washing tower tank level control system of an application as described in claim as arbitrary in claims 1 to 3, it is characterized in that: first the first switching pressure of the first Liquid level adjusting valve (4) under different pressures operating mode is set, the second switching pressure of second Liquid level adjusting valve (5) under different pressures operating mode is set, the wherein ratio of the first switching pressure and scrubbing tower (1) design operation pressure, and second the ratio switching pressure and scrubbing tower (1) design operation pressure be 60% ~ 75%, and the first switching force value is greater than the second switching force value,
When the pressure of scrubbing tower (1) switches pressure lower than second, second fluid level controller (7) and the second Liquid level adjusting valve (5) are in automatic control state, second fluid level controller (7) controls the aperture of the second Liquid level adjusting valve (5) with the flow of Controlling Technology water, and the first fluid level controller (6) and the first Liquid level adjusting valve (4) are in closed condition;
When the pressure of scrubbing tower (1) switches pressure higher than first, first fluid level controller (6) and the first Liquid level adjusting valve (4) are in automatic control state, first fluid level controller (6) controls the aperture of the first Liquid level adjusting valve (4) with the flow of Controlling Technology water, and the second fluid level controller (7) and the second Liquid level adjusting valve (5) are in closed condition;
In scrubbing tower (1) boost process, when the pressure of scrubbing tower (1) is elevated to the first switching pressure, second fluid level controller (7) and the second Liquid level adjusting valve (5) still maintain automatic control state, the first fluid level controller (6) and the first Liquid level adjusting valve (4) are switched to MANUAL CONTROL mode simultaneously; Then the aperture of the first Liquid level adjusting valve (4) is tuned up gradually, simultaneously the second fluid level controller (7) controls the second Liquid level adjusting valve (5) and turns down until complete shut-down gradually, then the second fluid level controller (7) and the second Liquid level adjusting valve (5) are switched to closed condition, then the first fluid level controller (6) and the first Liquid level adjusting valve (4) are switched to automatic control mode;
Or control the second fluid level controller (7) and the second Liquid level adjusting valve (5) by upper monitoring machine DCS system to work the automatic interlock switching of work of the first fluid level controller (6) and the first Liquid level adjusting valve (4);
In scrubbing tower (1) pressure reduction, when the pressure drop of scrubbing tower (1) switches pressure to second, first fluid level controller (6) and the first Liquid level adjusting valve (4) maintain automatic control state, the second fluid level controller (7) and the second Liquid level adjusting valve (5) are switched to MANUAL CONTROL mode simultaneously; Then the aperture of the second Liquid level adjusting valve (5) is tuned up gradually, simultaneously the first fluid level controller (6) controls the first Liquid level adjusting valve (4) and turns down until complete shut-down gradually, then the first fluid level controller (6) and the first Liquid level adjusting valve (4) are switched to closed condition, then the second fluid level controller (7) and the second Liquid level adjusting valve (5) are switched to automatic control mode;
Or control the first fluid level controller (6) and the first Liquid level adjusting valve (4) by upper monitoring machine DCS system to work the automatic interlock switching of work of the second fluid level controller (7) and the second Liquid level adjusting valve (5).
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| CN201510218011.1A CN104932561B (en) | 2015-05-04 | 2015-05-04 | A kind of synthesis gas washing tower tank level control system and its control method |
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| CN201510218011.1A CN104932561B (en) | 2015-05-04 | 2015-05-04 | A kind of synthesis gas washing tower tank level control system and its control method |
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| CN106020256A (en) * | 2016-05-15 | 2016-10-12 | 张波 | Water balance system based on automatic liquid level adjustment |
| CN111610774A (en) * | 2020-04-01 | 2020-09-01 | 石化盈科信息技术有限责任公司 | Method and system for calculating effective throw ratio, electronic equipment and storage medium |
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| CN111610774A (en) * | 2020-04-01 | 2020-09-01 | 石化盈科信息技术有限责任公司 | Method and system for calculating effective throw ratio, electronic equipment and storage medium |
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| Publication number | Publication date |
|---|---|
| CN104932561B (en) | 2017-11-28 |
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