CN110790357B - Discharge device for supercritical water oxidation system and control method thereof - Google Patents
Discharge device for supercritical water oxidation system and control method thereof Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000009284 supercritical water oxidation Methods 0.000 title claims abstract description 42
- 239000007921 spray Substances 0.000 claims abstract description 71
- 239000012530 fluid Substances 0.000 claims abstract description 68
- 238000005507 spraying Methods 0.000 claims abstract description 49
- 238000002360 preparation method Methods 0.000 claims abstract description 12
- 239000000498 cooling water Substances 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 230000006641 stabilisation Effects 0.000 claims abstract description 4
- 238000011105 stabilization Methods 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 76
- 238000005259 measurement Methods 0.000 claims description 45
- 238000011010 flushing procedure Methods 0.000 claims description 23
- 230000008569 process Effects 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000007599 discharging Methods 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 9
- 239000002699 waste material Substances 0.000 claims description 4
- 230000009467 reduction Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 238000009529 body temperature measurement Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000110 cooling liquid Substances 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000012958 reprocessing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000009279 wet oxidation reaction Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D3/00—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances
- A62D3/30—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by reacting with chemical agents
- A62D3/38—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by reacting with chemical agents by oxidation; by combustion
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
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Abstract
The invention provides a discharge device for a supercritical water oxidation system and a control method thereof, wherein the control method comprises the following steps of 1, step-by-step input; respectively connecting overpressure release fluids generated by pipelines with different pressure grades in a supercritical water oxidation system into a release device in a normal preparation state through independent release pipelines, wherein the release pipelines correspond to the pressure grades one by one; step 2, spraying and cooling; when overpressure release fluid flows into any one of the release pipelines, starting a spray pump to spray cooling water into the release device through the spray pipeline, and adjusting and controlling the spray amount according to the operation safety threshold of the operation parameters of the release device; step 3, completing overpressure relief; and when the time that the operation parameters of the relief device are not higher than the operation safety threshold exceeds the stabilization time threshold, the relief of the overpressure fluid is finished, and the spraying pump is closed to stop spraying.
Description
Technical Field
The invention relates to a control method of a supercritical water oxidation system, in particular to a discharge device for the supercritical water oxidation system and a control method thereof.
Background
The supercritical water oxidation technology is a high-efficiency, clean and high-concentration organic matter treatment technology which is difficult to degrade, and the organic matter is quickly and thoroughly converted into harmless CO through supercritical water oxidation reaction2、N2、H2O and other small molecular compounds. Because the supercritical water oxidation technology has incomparable technical advantages of other conventional technologies such as incineration method, wet oxidation method and the like, the supercritical water oxidation technology is widely applied to the treatment fields of various high-concentration and difficultly-degraded wastewater, solid waste, hazardous waste and the like. Due to the high temperature and high pressure operation conditions, the system occasionally runsWhen the internal pressure exceeds the limit due to emergency, the system overpressure protection device is started immediately to release high-temperature and high-pressure fluid.
The emergency release device of the supercritical water oxidation treatment system can avoid potential safety hazard caused by direct release of high-temperature and high-pressure fluid and serious environmental pollution, can release the high-temperature and high-pressure fluid with high temperature, high flow speed and large instantaneous flow in time and safely, and can recover and reprocess untreated harmful substances, thereby having great significance for safe operation of the system. However, there is no report on how to safely and reliably enter the bleed device for the high-temperature and high-pressure bleed fluid, how to stably operate the bleed device in the emergency bleed process, how to safely cool, decelerate, and recycle the bleed fluid, how to ensure that the operation of the high-temperature and high-pressure fluid emergency bleed device does not have serious adverse effect on a downstream system, and the like, so that the system control of the high-temperature and high-pressure fluid emergency bleed device is urgently to be established.
Therefore, the development of a control method for the high-temperature and high-pressure fluid emergency release device of the supercritical water oxidation treatment system is crucial to the safe operation of the whole system.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a discharge device for a supercritical water oxidation system and a control method thereof, which have reasonable design and can avoid the impact of high-temperature high-pressure fluid on medium-low temperature medium-low pressure pipeline equipment in the discharge process of mixed fluid; the functions of stable operation of the discharge device in the emergency discharge process, safe temperature reduction and speed reduction of discharged fluid and recovery and reprocessing can be realized; and the operation of the high-temperature high-pressure fluid emergency relief device can be ensured not to generate serious adverse effect on a downstream system.
The invention is realized by the following technical scheme:
a control method for a supercritical water oxidation system discharge device comprises the following steps,
step 1, inputting in a grading way;
respectively connecting overpressure release fluids generated by pipelines with different pressure grades in a supercritical water oxidation system into a release device in a normal preparation state through independent release pipelines, wherein the release pipelines correspond to the pressure grades one by one;
step 2, spraying and cooling;
when overpressure release fluid flows into any one of the release pipelines, starting a spray pump to spray cooling water into the release device through the spray pipeline, and adjusting and controlling the spray amount according to the operation safety threshold of the operation parameters of the release device;
step 3, completing overpressure relief;
and when the time that the operation parameters of the relief device are not higher than the operation safety threshold exceeds the stabilization time threshold, the relief of the overpressure fluid is finished, and the spraying pump is closed to stop spraying.
Preferably, in step 1, the overpressure relief fluid of different pressure levels is provided with two levels of high pressure and low pressure according to a high-pressure pipeline and a low-pressure pipeline arranged in the supercritical water oxidation system, or is provided with three levels of high pressure, low pressure and medium pressure according to a high-pressure pipeline, a low-pressure pipeline and a medium-pressure pipeline arranged in the supercritical water oxidation system; and the overpressure relief fluids of the same grade are connected into relief pipelines corresponding to the grade in a gathering manner.
Preferably, in step 2, the operating parameter includes an operating pressure and/or an operating temperature of the pressure relief device; and adjusting and controlling the spraying amount according to the corresponding pressure and/or temperature safety threshold value, so that the operation parameters are always within the operation safety threshold value.
Preferably, in step 3, after the overpressure fluid is released, the spraying amount of the spraying is maintained, and after a set delay time, the spraying pump is turned off to stop spraying.
Preferably, step 2 further comprises overflow control; in the spraying and cooling process, when the liquid level in the discharge device exceeds the set overflow liquid level, the discharge device discharges liquid outwards through the overflow pipeline, so that the liquid level in the discharge device descends, and the liquid level is maintained at the overflow liquid level.
Further, the method also comprises the step of flushing control;
after overpressure relief and spray cooling are finished, performing flushing control; carrying out blowdown on waste liquid generated by spraying in the discharge device through a blowdown pipeline, stopping blowdown when the liquid level in the discharge device is the lowest value, starting a flushing water pump to flush the discharge device, controlling to close the flushing pipeline and open the blowdown pipeline to carry out blowdown again after the liquid level in the discharge device reaches a set emptying liquid level, and completing cleaning after the steps are repeated;
after the cleaning is finished, the flushing pipeline is opened to fill water into the discharge device, so that the liquid level in the discharge device maintains the initial liquid level, and the discharge device returns to a normal preparation state.
And furthermore, the overflow liquid level is lower than the interface of the discharge pipeline on the discharge device and is not lower than the interface of the overflow pipeline on the discharge device.
Further, the start interlocking control is carried out on the spray water pump through a discharge pipeline measurement and control instrument respectively arranged on the discharge pipeline; the discharge pipeline measurement and control instrument is used for detecting the temperature, pressure or flow state of the overpressure discharge fluid and indicating the input of the overpressure discharge fluid;
the opening of a spray valve on a spray pipeline is subjected to interlocking control through a discharge device measurement and control instrument arranged on a discharge device, and a spray pump is subjected to closing interlocking control;
the opening degree of an overflow valve arranged on the overflow pipeline, the opening degree of a flushing pipeline valve arranged on the flushing pipeline and the opening degree of a sewage valve arranged on the sewage discharge pipeline are respectively controlled in an interlocking manner through a liquid level measuring and controlling instrument arranged on the discharge device; and the overflow valve is in a normally closed state when the liquid level does not reach the overflow liquid level.
Furthermore, the interior of the normally prepared discharge device is filled with cooling water with an initial liquid level height, a starting interlock of a discharge pipeline measurement and control instrument to the spray water pump is established, the opening interlock of the discharge device measurement and control instrument to the spray valve is established, and a closing interlock of the spray pump is established;
after overpressure relief is finished, the spray pump is closed, and the starting interlock, the opening interlock and the closing interlock which are established in a normal preparation state are disconnected; and after the cleaning is finished, the starting interlock, the opening interlock and the closing interlock are reestablished, and the relief device returns to a normal preparation state.
A discharge device for a supercritical water oxidation system is controlled by adopting the control method to complete overpressure discharge of the supercritical water oxidation system.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the invention, the fluid state properties of different sections of the supercritical water oxidation system are fully considered, the discharge is respectively carried out according to different temperatures and pressures, the impact of high-temperature and high-pressure fluid on medium-low temperature and low-pressure pipelines and equipment in the discharge process of mixed fluid can be effectively avoided, and the safety of system equipment and pipelines is ensured;
the flushing damage and the overheating damage to the discharge device at the moment of emergency discharge of the fluid are fully considered, and the amount of cooling water with the initial liquid level is stored in the control device in the initial state of the discharge device, so that the direct contact of the emergency discharge fluid to the discharge device is avoided, and meanwhile, the cooling water carries out primary heat exchange on the discharge fluid to reduce the temperature;
the problems of fluid temperature reduction and speed reduction at the moment of emergency release are fully considered, most of fluid is in a superheated steam state due to the fact that released fluid enters a release device for instant pressure reduction, once a signal of a measurement and control instrument of a release pipeline responds, a spray pump and a spray pipeline valve are immediately started to enable cooling water to enter a spray layer, and therefore the released fluid converted into superheated steam is cooled or even liquefied, and the amount and the flow rate of the fluid discharged from an exhaust port are reduced;
the liquid level control of the emergency discharge device in the discharge process is fully considered, the overflow valve is controlled by the liquid level meter, and the overflow valve is in a normally closed state when the specified liquid level of the overflow liquid level is not reached, so that the liquid level in the discharge device is always in a proper position, the initial cooling of the discharged fluid is facilitated, the discharged fluid cannot be discharged into a downstream system to influence the downstream system, and the unsmooth discharge of cooling liquid in the discharge device due to blockage of a discharge outlet by solid-phase deposition in the discharged fluid is further avoided;
the stable and safe operation of the emergency relief device in the relief process is fully considered, and the flow of the spray water is controlled by the relief device measuring and controlling instrument so as to maintain the temperature and the pressure in the relief device within a safe range and ensure the reliable operation of the relief device.
In a word, the invention carries out special control aiming at the functional characteristics of the emergency relief device of the supercritical water oxidation system, so that the relief fluid of the supercritical water oxidation system is respectively released according to high pressure and low pressure, or high pressure, medium pressure and low pressure, and the impact of the high-temperature and high-pressure fluid to middle-low temperature and medium-low pressure pipelines and equipment in the relief process of the mixed fluid can be avoided; the functions of stable operation of the discharge device in the emergency discharge process and safe cooling, speed reduction and recovery reprocessing of discharged fluid can be realized; and the operation of the high-temperature high-pressure fluid emergency relief device can be ensured not to generate serious adverse effect on a downstream system.
Drawings
FIG. 1 is a schematic diagram of a control method of an emergency relief device for a supercritical water oxidation treatment system according to the present invention.
In the figure, 1 is first discharge pipeline measurement and control instrument, 2 second discharge pipeline measurement and control instrument, 3 is discharge apparatus measurement and control instrument, 4 is liquid level measurement and control instrument, 5 is discharge apparatus, 6 is the overflow valve, 7 is the blowdown valve, 8 is the spray valve, 9 is spray pump, 10 is the wash pipe way valve, 11 is wash pump, 12 is the spray pipe way, 13 is first discharge pipeline, 14 is the second discharge pipeline, 15 is the wash water pipeline, 16 is the blowdown pipeline.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
As shown in fig. 1, a control method for a supercritical water oxidation system discharge apparatus includes discharge control, spray control, overflow control and cleaning control;
the discharge control comprises the starting control of the motor of the spray water pump 9 by the first and second discharge pipeline measurement and control instruments 1 and 2;
the spraying control comprises the opening control of the measurement and control instrument 3 of the discharge device on the spraying valve 8 and the closing control of the motor of the spraying pump 9;
the overflow control comprises the control of the liquid level measuring and controlling instrument 4 on the overflow valve 6;
the cleaning control comprises the control of the liquid level measuring and controlling instrument 4 on the flushing pipeline valve 10 and the blow-off valve 7.
After high-pressure and low-pressure fluid overpressure of a supercritical water oxidation system is respectively released through a first release pipeline 13 and a second release pipeline 14, the first release pipeline measurement and control instrument 1 and the second release pipeline measurement and control instrument 2 control the starting of the spraying module, if the first release pipeline measurement and control instrument 1 and the second release pipeline measurement and control instrument 2 are temperature measurement and control instruments, the first release pipeline measurement and control instrument 1 and the second release pipeline measurement and control instrument 2 can set the temperature to be higher than 60 ℃ or can reflect the temperature of the release fluid in the release pipeline, the first release pipeline measurement and control instrument 1 and the second release pipeline measurement and control instrument 2 control the starting of; if the pressure or flow measurement and control instrument is used, the control threshold value of the pressure or flow is determined according to the pressure and the flow of the discharge form of the discharge fluid; and the spraying is controlled according to the measuring and controlling instrument 3 of the discharging device on the discharging device 5, so that the spraying amount of the spraying pump 9 is adjusted according to the value set by the measuring and controlling instrument 3 of the discharging device.
If the measurement and control instrument 3 of the discharge device is a temperature measurement and control instrument, the temperature can be set to be 80-95 ℃ (without being limited to the temperature range), the temperature is higher than 95 ℃, the opening degree of the spray valve 8 is increased, the spray water quantity is increased, and if the temperature is lower than 80 ℃, the opening degree of the spray valve 8 can be reduced, so that the temperature is maintained at 80-95 ℃;
if the measurement and control instrument 3 of the relief device is a pressure measurement and control instrument, the pressure can be set to be 0-0.2 MPa (not limited to the pressure range), and the opening degree of the spray valve 8 is adjusted to maintain the normal work of the spray module;
when the measurement and control instrument 3 of the discharge device is continuously lower than or equal to the operation safety threshold value within a certain time, for example, within 20min, the overpressure discharge and the spraying process are considered to be finished, and the measurement and control instrument 3 of the discharge device can control the motor of the spray water pump 9 to be turned off so as to finish the spraying process; manually releasing the starting interlock of the first and second discharge pipeline measurement and control instruments 1 and 2 to the motor of the spray pump 9, and manually releasing the control interlock of the discharge device measurement and control instrument 3 to the opening degree of the spray valve 8 and the closing interlock of the motor of the spray pump 9;
in the spraying process, when the liquid level meter measuring and controlling instrument 4 on the discharge device 5 displays that the liquid level exceeds 200mm above an overflow pipeline interface or other range values, the overflow valve 6 is controlled to be opened, so that the liquid level can descend and be finally stabilized at the overflow liquid level according to flow matching, and the overflow liquid level can be determined by calculation of the sizes of different discharge devices and the aperture and height of the discharge pipeline interface; this overflow level is 100mm or other range below the interface height of the first and second drain lines 13, 14 on the drain 5 to ensure that the drain fluid drains smoothly and to maintain the liquid level within the drain 5 at the overflow level. Preferably, the overflow liquid level can be a range value, overflow is carried out when the overflow liquid level exceeds an upper limit, and the overflow liquid level is not lower than a lower limit when the overflow liquid level is discharged.
After the overpressure relief and the spraying process are finished, performing flushing control; when the measuring and controlling instrument 3 is continuously lower than or equal to the operation safety threshold within a certain time (such as 20min), the overpressure relief and the spraying process can be considered to be finished;
during washing control, the liquid level meter measuring and controlling instrument 4 controls the blow-down valve 7 to be opened to empty waste liquid generated by spraying in the discharge device 5, when the liquid level meter measuring and controlling instrument 4 displays that the liquid level is the lowest value, the blow-down valve 7 is controlled to be closed, the washing water pump 11 is manually opened to wash the discharge device 5, when the liquid level meter measuring and controlling instrument 4 displays that the liquid level of washing water reaches the empty liquid level, the washing pipeline valve 10 is controlled to be closed and the blow-down valve 7 is opened to empty again, the circulation is repeated for three times or the circulation times are determined according to actual conditions to finish washing, after the washing is finished, the washing pipeline valve 10 is controlled to be opened to fill water into the discharge device 5, and the liquid level in the discharge device; the starting interlocking of the first and second discharge pipeline measurement and control instruments 1 and 2 to the motor of the spray pump 9 is manually established, the control interlocking of the discharge device measurement and control instrument 3 to the opening degree of the spray valve 8 and the closing interlocking of the motor of the spray pump 9 are manually established, and the discharge device 5 returns to a normal preparation state to finish cleaning and homing.
During the discharge control, the fluid discharged by overpressure of the supercritical water oxidation system is respectively discharged according to high pressure and low pressure in the system, or respectively discharged according to high pressure, medium pressure and low pressure in the system, and the specific classification method is determined by the specific system; dividing according to the system composition of the supercritical water oxidation system, and respectively discharging the fluid after the preheating section as high-temperature high-pressure fluid and the fluid before the preheating section as low-temperature low-pressure fluid; or according to different section pressure, such as normal pressure-2 MPa, 2-10MPa, 10MPa and above reaction pressure, respectively discharging corresponding to high temperature and high pressure, medium temperature and medium pressure, and low temperature and low pressure; the division can be performed according to the actual situation of the system.
The first and second discharge pipeline measurement and control instruments 1 and 2 can be temperature instruments, pressure instruments, flow instruments or any other instruments capable of indicating the temperature, pressure and flow of discharge fluid;
the measurement and control instrument 3 of the discharge device on the discharge device 5 can be a temperature instrument or a pressure instrument or other instruments indicating the temperature or pressure state of the discharge fluid after being sprayed and cooled in the discharge device 5;
when the liquid level does not reach the overflow liquid level designated position, the overflow valve 6 is in a normally closed state to prevent high-temperature and high-pressure discharge fluid from influencing a downstream system;
and the discharge device measurement and control instrument 3 on the discharge device 5 controls the closing of the spray pump 9 and the opening of the spray pipeline valve 8. The measurement and control instrument 3 of the bleeder device can also control the flow of the spray pump 9 through a motor and adjust the spray flow together with the spray pipeline valve 8.
For example, in the case of an emergency, the control method of the supercritical water oxidation treatment system discharge device comprises the following steps:
(1) initial control
a) The discharging device 5 is internally stored with cooling water with the initial liquid level height;
b) the overflow valve 6, the sewage discharge valve 7 and the flushing pipeline valve 10 are in a closed state, and the spraying valve 8 is in an open state;
c) the spray pump 9 is in a closed state, and the flushing pump 11 is in a closed state;
d) the first and second discharge pipeline measurement and control instruments 1 and 2 are interlocked with the motor of the spray pump 9;
e) the bleeder device controls the instrument 3 to be interlocked with the closing of the motor of the spray water pump 9 and the opening degree of the spray pipeline valve 8;
f) the liquid level control instrument 4 is interlocked with the overflow valve 6, the blowdown valve 7 and the flushing pipeline valve 10;
(2) accident state control
a) After high-pressure fluid and low-pressure fluid of the supercritical water oxidation system are respectively discharged through the first discharge pipeline 13 and the second discharge pipeline 14, the first discharge pipeline measurement and control instrument 1 and the second discharge pipeline measurement and control instrument 2 respond to the high-pressure fluid and the low-pressure fluid, the spray pump 9 is controlled to be started, a motor of the spray pump 9 is started to maintain basic flow, the spray valve 8 maintains initial opening degree, cooling water is sprayed into the discharge device, the initial opening degree is matched with the flow of the spray water, and calculation can be carried out according to the flow of overpressure discharge fluid generated by the discharge device after the system; in the system safety, the pressure is considered first, in the supercritical system, the pressure must be increased first and then the temperature is increased, and for the safety, the pressure has a larger influence on the whole system, so the pressure is considered preferentially.
b) The control instrument 3 of the bleeder device on the bleeder device 5 controls the opening of the spray valve 8 to adjust the spray amount according to the value set by the control instrument 3 of the bleeder device, and maintains the running state in the bleeder device 5 within the range of the set running safety threshold;
c) the liquid level meter 4 on the discharging device 5 controls overflow in the spraying process, and when the liquid level meter 4 displays that the liquid level exceeds the set overflow liquid level threshold, the overflow valve 6 is opened to maintain the liquid level in the discharging device 5 below the set overflow threshold; namely, overflow is carried out after the overflow liquid level is exceeded, so that the liquid level in the discharge device 5 is maintained at the overflow liquid level;
d) when the time that the values of the first and second discharge pipeline measurement and control instruments 1 and 2 are lower than the operation safety threshold exceeds the stabilization time threshold (such as 20min), the discharge of overpressure fluid can be proved to be finished, the spraying amount of the spraying pump 9 and the opening degree of the spraying valve 8 are maintained, and the spraying process can be finished after the delay time (such as 5 min);
e) after the spraying process is finished, the interlocking of the first and second discharge pipeline measurement and control instruments 1 and 2 with the spraying pump 9 and the spraying valve 8 is disconnected, the interlocking of the discharge device control instrument 3 with the spraying pump 9 and the spraying valve 8 is disconnected, and the spraying pump 9 and the spraying valve 8 are closed;
f) starting flushing, wherein the liquid level control instrument 4 controls the blow-down valve 7 to be opened, so as to blow down cooling liquid in the discharge device 5, and simultaneously opens the flushing pump 11 and the flushing pipeline valve 10 to flush the interior of the discharge device;
g) after cleaning, the liquid level control instrument 4 controls to switch on and off the flushing pipeline valve 10, so that the liquid level in the discharge device 5 reaches the initial liquid level, and the flushing pipeline valve 10 and the flushing water pump 11 are closed;
h) establishing the interlocking of the first and second discharge pipeline measurement and control instruments 1 and 2 and the spray pump 9, establishing the interlocking of the discharge device control instrument 3, the spray pump 9 and the spray valve 8, opening the spray pump 9 and the spray valve 8, and returning the discharge device 5 to a normal preparation state.
The overpressure relief refers to the situation that relief valves are automatically opened to release due to the fact that pressure of different pipelines in a supercritical water oxidation system is out of limit, and the control method belongs to a control method of a downstream relief device after relief of the overpressure relief valves of the pipelines of the system.
The above description is only for the purpose of illustrating the present invention, and the scope of the present invention is not limited thereto, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A control method for a supercritical water oxidation system discharge device is characterized by comprising the following steps,
step 1, inputting in a grading way;
overpressure release fluids generated by pipelines with different pressure grades in a supercritical water oxidation system are respectively connected into a release device (5) in a normal preparation state through independent release pipelines, and the release pipelines correspond to the pressure grades one by one;
the overpressure relief fluid with different pressure grades is provided with a high pressure grade and a low pressure grade correspondingly according to a high pressure pipeline and a low pressure pipeline arranged in the supercritical water oxidation system, or is provided with a high pressure grade, a low pressure grade and a medium pressure grade correspondingly according to a high pressure pipeline, a low pressure pipeline and a medium pressure pipeline arranged in the supercritical water oxidation system; the overpressure relief fluids of the same grade are connected into relief pipelines corresponding to the grade in a gathering manner;
step 2, spraying and cooling;
when overpressure release fluid flows into any one of the release pipelines, a spray pump (9) is started to spray cooling water into the release device (5) through the spray pipeline, and the spray amount is adjusted and controlled according to the operation safety threshold of the operation parameters of the release device (5);
step 2, overflow control is also included; in the spraying and cooling process, when the liquid level in the drainage device (5) exceeds the set overflow liquid level, the drainage device (5) discharges liquid outwards through an overflow pipeline, so that the liquid level in the drainage device (5) is lowered, and the liquid level is maintained at the overflow liquid level;
step 3, completing overpressure relief;
and when the time that the operation parameter of the relief device (5) is not higher than the operation safety threshold exceeds the stabilization time threshold, the overpressure fluid is released completely, and the spraying pump (9) is closed to stop spraying.
2. The control method for supercritical water oxidation system relief device according to claim 1 is characterized in that in step 2, the operation parameters include the operation pressure and/or operation temperature of the pressure relief device (5); and adjusting and controlling the spraying amount according to the corresponding pressure and/or temperature safety threshold value, so that the operation parameters are always within the operation safety threshold value.
3. The method for controlling the relief device of supercritical water oxidation system according to claim 1, wherein in step 3, after the overpressure fluid is released, the spraying amount of the spraying is maintained, and after the set delay time, the spraying pump (9) is turned off to stop spraying.
4. The control method for supercritical water oxidation system relief apparatus according to claim 1, further comprising a flush control;
after overpressure relief and spray cooling are finished, performing flushing control; waste liquid generated by spraying in the discharging device (5) is discharged through a discharge pipeline (16), when the liquid level in the discharging device (5) is the lowest value, the discharge is stopped, a washing water pump (11) is started to wash the discharging device (5), when the liquid level in the discharging device (5) reaches the set emptying liquid level, the washing pipeline is controlled to be closed, the discharge pipeline (16) is opened to discharge the waste again, and the cleaning is completed after the circulation is repeated for multiple times;
after cleaning, the flushing pipeline is opened to fill water into the discharge device (5), so that the liquid level in the discharge device (5) is maintained at the initial liquid level, and the discharge device (5) returns to a normal preparation state.
5. The control method for supercritical water oxidation system relief apparatus according to claim 4 wherein the overflow level is lower than the interface of the relief line on the relief apparatus (5) and not lower than the interface of the overflow line on the relief apparatus (5).
6. The control method for the supercritical water oxidation system discharge apparatus according to claim 4, characterized in that the start-up interlock control is performed on the spray water pump (9) by discharge pipeline measurement and control instruments respectively arranged on the discharge pipeline; the discharge pipeline measurement and control instrument is used for detecting the temperature, pressure or flow state of the overpressure discharge fluid and indicating the input of the overpressure discharge fluid;
the opening degree of a spray valve (8) on a spray pipeline is subjected to interlocking control through a discharge device measurement and control instrument (3) arranged on a discharge device (5), and a spray pump (9) is subjected to closing interlocking control;
the opening degree of an overflow valve (6) arranged on the overflow pipeline, the opening degree of a flushing pipeline valve (10) arranged on the flushing pipeline and the opening degree of a blowdown valve (7) arranged on the blowdown pipeline are respectively subjected to interlocking control through a liquid level measurement and control instrument (4) arranged on the blowdown device (5); the overflow valve (6) is in a normally closed state when the liquid level does not reach the overflow liquid level.
7. The control method for the supercritical water oxidation system discharge apparatus according to claim 6, characterized in that the discharge apparatus (5) in the normal preparation state has the cooling water with the initial liquid level inside, and establishes the start interlock of the discharge pipeline measurement and control instrument to the spray pump (9), the discharge apparatus measurement and control instrument (3) interlocks the opening degree of the spray valve (8), and the close interlock of the spray pump (9);
after overpressure relief is finished, the spray pump (9) is closed, and the starting interlock, the opening interlock and the closing interlock which are established in a normal preparation state are disconnected; and after the cleaning is finished, the starting interlock, the opening interlock and the closing interlock are reestablished, and the relief device (5) returns to a normal preparation state.
8. A relief device for supercritical water oxidation system, characterized in that the control method according to any one of claims 1-7 is adopted to control and complete the overpressure relief of the supercritical water oxidation system.
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| CN113756767B (en) * | 2021-08-31 | 2023-04-11 | 西安交通大学 | Supercritical hydrothermal combustion type multi-element thermal fluid generation system and method |
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| US7186345B2 (en) * | 2003-05-06 | 2007-03-06 | Engineered Support Systems, Inc. | Systems for water purification through supercritical oxidation |
| US20160264436A1 (en) * | 2015-03-12 | 2016-09-15 | Kenichi Hayakawa | Fluid treatment apparatus |
| CN205441515U (en) * | 2016-03-10 | 2016-08-10 | 西安交通大学 | A high temperature fluid emergency vent device for supercritical water processing system |
| CN205504325U (en) * | 2016-04-13 | 2016-08-24 | 武汉东海源环境工程有限公司 | Hydrophobic muffling device of high temperature high pressure steam conduit |
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