CN111488007A - Pressure control system and method for supercritical water oxidation technology - Google Patents
Pressure control system and method for supercritical water oxidation technology Download PDFInfo
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/20—Control of fluid pressure characterised by the use of electric means
- G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
- G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
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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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- 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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00162—Controlling or regulating processes controlling the pressure
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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
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Abstract
The invention relates to the technical field of supercritical water oxidation, and provides a pressure control system and a pressure control method for supercritical water oxidation technology, wherein the pressure control system comprises control equipment, a first pressure regulating valve, a stable operation pipeline and a start-stop vehicle pipeline, the stable operation pipeline comprises a flow limiting device, and the start-stop vehicle pipeline comprises a second pressure regulating valve; starting the reaction device, opening a first pressure regulating valve and a vehicle starting and stopping pipeline by control equipment, controlling the vehicle starting and stopping pipeline to be switched to a stable operation pipeline when the system pressure and the medium flow both reach preset values, and regulating the current system pressure to a preset pressure value by the first pressure regulating valve and a current limiting device; and the reaction device stops, the stable operation pipeline is controlled to be switched to the start-stop vehicle pipeline, and the first pressure regulating valve and the second pressure regulating valve reduce the current system pressure to normal pressure. The invention improves the automation level of pressure control of the supercritical water oxidation technology, cancels the damping water pump and the capillary pressure reducer, reduces the investment cost of equipment and prolongs the service life of the system.
Description
Technical Field
The invention belongs to the technical field of supercritical water oxidation, and particularly relates to a pressure control system and method for supercritical water oxidation technology.
Background
Supercritical Water Oxidation (SCWO) is a novel Oxidation technology capable of thoroughly destroying organic structures, is used for treating liquid, semi-solid, solid and other organic wastes, can realize reduction, reclamation and harmlessness of the wastes, and is particularly suitable for the fields of waste organic solvents, sludge, kettle residual liquid, waste emulsifiers, waste catalysts and the like which are difficult to treat by using a traditional degradation method.
the reaction device outlet of supercritical water oxidation has the operation temperature of about 250 ℃, the operation pressure is more than or equal to 23MPa, the chloride ion concentration is 1000-2000 mg/L, the reaction device outlet belongs to the corrosion working condition of high-temperature high-pressure oxygen enrichment, the pressure reduction working section needs to reduce the system pressure from 23MPa to normal pressure, and the reaction device outlet is a rare high-temperature high-pressure difference working condition in the coal chemical industry and the environmental protection industry.
In the starting and stopping stages of the supercritical technology, the medium flow rate can not reach the design value far away from the stable operation stage, the capillary tube pressure reducer adopts the friction resistance pressure reduction of a long and thin pipeline, the pressure reduction range changes along with the change of the medium flow rate, but the pressure reduction mode combining the control valve and the capillary tube can not meet the working conditions, the medium flow rate of the damping water pump adjusting pipeline is required to stabilize the pressure of the device, the equipment investment is increased, the fault point is increased, and the consumption of water resources is brought. When the capillary tube pressure reducer is in a stable operation stage, the temperature of a system is stabilized to be about 250 ℃, for gas-liquid-solid three-phase high-salt media, the capillary tube pressure reducer is very easy to adhere to the inner wall of the capillary tube pressure reducer and scale is formed, the resistance of the capillary tube pressure reducer is gradually increased, the system pressure is increased along with the increase of the system pressure until the system pressure is close to the design pressure, the capillary tube is washed by a medicament or high-pressure water after manual parking, but the cleaning effect is not good, the service life of the capillary tube is limited, meanwhile, the pressure reduction process in the stable operation stage is usually accompanied by flash evaporation and cavitation, the material and the structure of equipment are improperly selected, so that the corrosion, the internal leakage, the external leakage and the blockage of the device can be.
Disclosure of Invention
In view of this, embodiments of the present invention provide a pressure control system and method for supercritical water oxidation technology, so as to solve the problems that the traditional pressure control method for supercritical water oxidation technology cannot meet the requirements of working conditions, and has high equipment cost and short service life.
The first aspect of the embodiment of the invention provides a pressure control system for supercritical water oxidation technology, which comprises control equipment, a first pressure regulating valve, a stable operation pipeline and a start-stop vehicle pipeline, wherein an inlet of the first pressure regulating valve is connected with an outlet pipeline of a reaction device;
The stable operation pipeline comprises a flow limiting device, an inlet of the flow limiting device is connected with an outlet of the first pressure regulating valve, and an outlet of the flow limiting device is connected with an inlet pipeline of the system after pressure reduction; the starting and stopping vehicle pipeline comprises a second pressure regulating valve, the inlet of the second pressure regulating valve is connected with the outlet of the first pressure regulating valve, and the outlet of the second pressure regulating valve is connected with the inlet pipeline of the system after pressure reduction;
When the reaction device is started, the control equipment opens the first pressure regulating valve and the start-stop pipeline, when the system pressure reaches a preset pressure value and the medium flow reaches a preset flow value, the control equipment controls the start-stop pipeline to be switched to the stable operation pipeline, and the first pressure regulating valve and the flow limiting device regulate the current system pressure to a preset pressure value;
When the reaction device stops, the control equipment controls the stable operation pipeline to be switched to the starting and stopping pipeline, and the first pressure regulating valve and the second pressure regulating valve reduce the current system pressure to normal pressure.
Further, when any one of the flow limiting device and the pipeline on the stable operation pipeline has a fault, the control equipment controls the stable operation pipeline to be switched to the starting and stopping pipeline, and the fault is eliminated on line.
Further, the flow limiting device comprises a plurality of groups of wafer-type flow limiting orifice plates connected in series.
Furthermore, each group of the wafer-type flow limiting pore plates comprises a pore plate and two flanges;
The pore plate is clamped between the two flanges.
Further, the pressure control system for supercritical water oxidation technology further comprises: a first pressure detection means, a second pressure detection means, and a third pressure detection means;
The first pressure detection device is arranged at the outlet of the reaction device and used for acquiring the pressure before pressure reduction and sending the pressure to the control equipment;
The second pressure detection device is arranged at the outlet of the first pressure regulating valve and used for acquiring the outlet pressure of the first pressure regulating valve and sending the outlet pressure to the control equipment;
The third pressure detection device is arranged at the inlet of the system after pressure reduction and used for acquiring the pressure after pressure reduction and sending the pressure to the control equipment;
And the control equipment controls the on-line switching of the stable operation pipeline and the start-stop pipeline according to the pressure of the first pressure detection device, the pressure of the second pressure detection device and the pressure of the third pressure detection device.
Further, the pressure control system for supercritical water oxidation technology further comprises: a first differential pressure display device and a second differential pressure display device;
The first pressure difference display device displays a first pressure difference, wherein the first pressure difference is a difference value between the pressure of the first pressure detection device and the pressure of the second pressure detection device in the control equipment;
The second pressure difference display device displays a second pressure difference, which is a difference between the pressure of the second pressure detection device and the pressure of the third pressure detection device in the control device.
Further, the steady operation pipeline further comprises: a first stop valve and a second stop valve; the inlet of the first stop valve is connected with the outlet of the first pressure regulating valve, the outlet of the first stop valve is connected with the inlet of the flow limiting device, the inlet of the second stop valve is connected with the outlet of the flow limiting device, and the outlet of the second stop valve is connected with an inlet pipeline of the depressurized system;
The start-stop line further comprises: a third stop valve and a fourth stop valve; an inlet of the third stop valve is connected with an outlet of the first pressure regulating valve, an outlet of the third stop valve is connected with an inlet of the second pressure regulating valve, an inlet of the fourth stop valve is connected with an outlet of the third pressure regulating valve, and an outlet of the fourth stop valve is connected with an inlet pipeline of a system after pressure reduction;
The control device controls the on-line switching of the stable operation pipeline and the start/stop pipeline by controlling the on/off of the first stop valve, the second stop valve, the third stop valve and the fourth stop valve.
A second aspect of the embodiments of the present invention provides a pressure control method for supercritical water oxidation technology, which is applied to any one of the pressure control systems for supercritical water oxidation technology provided in the first aspect of the embodiments, and includes:
When the reaction device is started, the first pressure regulating valve and the start-stop pipeline are opened;
When the system pressure reaches a preset pressure value and the medium flow reaches a preset flow value, controlling the starting and stopping pipeline to be switched to a stable operation pipeline, and regulating the current system pressure to the preset pressure value through the first pressure regulating valve and a current limiting device on the stable operation pipeline;
When the reaction device stops, the stable operation pipeline is controlled to be switched to the starting and stopping pipeline, and the first pressure regulating valve and a second pressure regulating valve on the starting and stopping pipeline reduce the current system pressure to normal pressure.
Further, the pressure control method for supercritical water oxidation technology further comprises:
And when any one of the flow limiting device and the pipeline on the stable operation pipeline has a fault, controlling the stable operation pipeline to be switched to the starting and stopping pipeline, and removing the fault on line.
A third aspect of embodiments of the invention provides a supercritical water oxidation system including a pressure control system for supercritical water oxidation technology as described in any one of the first aspect of embodiments.
Compared with the prior art, the pressure control system and method for the supercritical water oxidation technology have the beneficial effects that: the system mainly comprises control equipment, a first pressure regulating valve, a stable operation pipeline and a start-stop vehicle pipeline, wherein the stable operation pipeline comprises a flow limiting device, and the start-stop vehicle pipeline comprises a second pressure regulating valve, so that the structure is simple, and the cost is reduced; when the reaction device is started, the control equipment opens the first pressure regulating valve and opens and stops the vehicle pipeline, when system pressure and medium flow all reach the preset value, control is started and is stopped the vehicle pipeline and switch over to the steady operation pipeline, first pressure regulating valve and current limiting device carry out the pressure regulation to preset pressure value to current system pressure, when the reaction device stops, control steady operation pipeline switches over to opening and stops the vehicle pipeline, first pressure regulating valve and second pressure regulating valve drop current system pressure to the ordinary pressure, the automation level of the pressure control of supercritical water oxidation technology is improved, the pressure regulation range is enlarged, and the damping water pump is cancelled, the investment cost of equipment is reduced, the problem that the capillary tube step-down transformer is easy to scale is solved simultaneously, the cleaning is difficult, the floor area is big, the investment is high, and the service life of the system is prolonged.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a pressure control system for supercritical water oxidation technology according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of another pressure control system for supercritical water oxidation technology according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of another pressure control system for supercritical water oxidation technology according to an embodiment of the present invention
Fig. 4 is a schematic flow chart illustrating an implementation of a pressure control method for supercritical water oxidation technology according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
referring to fig. 1, the pressure control system for supercritical water oxidation technology provided by this embodiment mainly includes a control device L0, a first pressure regulating valve 3, a stable operation pipeline L1, and a start-stop vehicle pipeline L02, the control device L10 is electrically connected to the first pressure regulating valve 3, devices on the stable operation pipeline L21, and devices on the start-stop vehicle pipeline L2, an inlet of the first pressure regulating valve 3 is connected to an outlet pipeline of the reaction apparatus 1, an inlet of the stable operation pipeline L1 and an inlet of the start-stop vehicle pipeline L2 are connected to an outlet of the first pressure regulating valve 3, an outlet of the stable operation pipeline L1 and an outlet of the start-stop vehicle pipeline L2 are connected to an inlet pipeline of the post-depressurization system 8, and the control device L0 monitors and controls the stable operation pipeline L1 and the start-stop vehicle pipeline L2.
the stable operation pipeline L1 comprises a flow limiting device 5, an inlet of the flow limiting device 5 is connected with an outlet of the first pressure regulating valve 3, an outlet of the flow limiting device 5 is connected with an inlet pipeline of the system 8 after pressure reduction, the start-stop vehicle pipeline L2 comprises a second pressure regulating valve 6, an inlet of the second pressure regulating valve 6 is connected with an outlet of the first pressure regulating valve 3, and an outlet of the second pressure regulating valve 6 is connected with an inlet pipeline of the system 8 after pressure reduction, so that the number of the pressure regulating valves is reduced, and the equipment investment is reduced.
specifically, the control device L0 is electrically connected to both the first pressure regulating valve 3 and the second pressure regulating valve 6, a control signal of the opening degree of the first pressure regulating valve 3 is given by the control device L0, a feedback signal of the valve position is returned to the control device L0 to display the actual opening degree of the valve, illustratively, the pressure regulating range of the first pressure regulating valve 3 may be 0-10 MPa, a control signal of the opening degree of the second pressure regulating valve 6 is given by the control device L0, and a valve position feedback signal of the second pressure regulating valve 6 is returned to the control device L0 to display the actual opening degree of the corresponding valve, illustratively, the pressure regulating range of the second pressure regulating valve 6 may be 0-10 MPa, the regulating range of the whole pipeline is large, and the defect that other pressure reducing devices (such as a capillary pressure reducer) are not adjustable is overcome.
In practical application, the pressure control system may include three stages, the first stage is a stage of pressurizing the system pressure to a preset pressure value, such as 23MPa, the second stage is a stage of stabilizing pressure to maintain the system pressure at the preset pressure value and not increase or decrease the system pressure, and the third stage is a stage of reducing pressure, and when the reaction apparatus 1 is stopped, the system pressure needs to be reduced to normal pressure.
specifically, when the reaction device 1 is started, the control device L0 opens the start-stop vehicle pipeline L2 and the first pressure regulating valve 3, the control device L0 regulates the first pressure regulating valve 3 and the second pressure regulating valve 6 to increase the system pressure along with the increase of the water amount, when the system pressure reaches a preset pressure value and the medium flow reaches a preset flow, the control device L0 controls the start-stop vehicle pipeline L2 to be switched to the stable operation pipeline L1, the stable operation pipeline L1 carries out pressure stabilization treatment, namely the current system pressure is regulated to the preset pressure value through the first pressure regulating valve 3 and the flow limiting device 5, the system pressure is maintained at the preset pressure value and is not reduced or not increased, when the reaction device 1 stops, the control device L0 controls the stable operation pipeline L1 to be switched to the start-stop vehicle pipeline L2, and the current system pressure is reduced to the normal pressure through the second pressure regulating valve 6 and the first pressure regulating valve 3, and the pressure regulation requirements under different working conditions are met.
Above-mentioned a pressure control system for supercritical water oxidation technique has reduced the use of air-vent valve, has reduced equipment cost, has improved the automation level of the pressure control of supercritical water oxidation technique, has enlarged pressure control range, and cancels the damping water pump, has reduced the investment cost of equipment, has solved easy scale deposit of capillary depressor simultaneously, is difficult for wasing, area is big, investment height's problem, has improved system life.
optionally, the Control device L0 of this embodiment may be a Distributed Control System (DCS), which adopts a structural form of multi-layer hierarchical, cooperative and autonomous, and is configured to perform centralized management and Distributed Control, so that the Control reliability is high.
Alternatively, both the first pressure regulating valve 3 and the second pressure regulating valve 6 of the present embodiment may be configured as pneumatic straight valves. In addition, referring to fig. 3, in order to prevent solid particles in the medium from accumulating and attaching on the inner wall of the valve, the first pressure regulating valve 3 and the second pressure regulating valve 6 can be pneumatic angle valves with simple flow paths and small resistance, the outlet pressure of the pneumatic angle valves 6 is lower than the saturated vapor pressure, the flash evaporation working condition is adopted, the flushing of the internal part and the outlet valve cavity is large, the valve cavity and the caliber of the valve cavity are enlarged at the valve outlet, and a three-level pore plate is embedded, so that the effects of flow equalization and stable pressure reduction in a segmented mode are realized, the flushing of the internal part and the outlet valve cavity under the flash evaporation working condition is avoided, the internal part and the outlet valve cavity.
Optionally, the flow restriction device 5 of the present embodiment includes a plurality of sets of wafer-type restriction orifice plates connected in series. Each wafer type flow limiting pore plate comprises a pore plate and two flanges, and the pore plate is wafer-clamped between the two flanges, so that the online disassembly and replacement of the pore plate are realized, and the flexibility of the pressure reduction system is improved; the multiunit is to the orifice plate series connection, has widened the step-down scope of 5 butt clamp formula current-limiting orifice plates, has realized segmentation and steady step-down, compares with capillary step-down transformer, and orifice plate throttling element can be dismantled, and cost of maintenance is low, and the velocity of flow is fast, difficult jam, and equipment is compact, takes up an area of for a short time.
In one embodiment, referring to fig. 2, the pressure control system for supercritical water oxidation technology further comprises: a first pressure detection means 2, a second pressure detection means 4 and a third pressure detection means 7.
The first pressure detection device 2 is arranged at the outlet of the reaction device 1, the second pressure detection device 4 is arranged at the outlet of the first pressure regulating valve 3, and the third pressure detection device 7 is arranged at the inlet of the post-depressurization system 8.
the control device L0 controls the on-line switching of the stable operation pipeline L1 and the start-stop vehicle pipeline L2 according to the pressure of the first pressure detection device 2, the pressure of the second pressure detection device 4 and the pressure of the third pressure detection device 7, the system pressure is guaranteed to meet the requirements in each stage, and the automation level of pressure control is improved.
Optionally, the first pressure detection device 2, the second pressure detection device 4, and the third pressure detection device 7 may be pressure transmitters.
Further, referring to fig. 2, the pressure control system for supercritical water oxidation technology further includes: a first differential pressure display device 9 and a second differential pressure display device 10.
the first pressure difference display means 9 displays a first pressure difference, which is a difference between the pressure of the first pressure detection means 2 and the pressure of the second pressure detection means 4 in the control device L0 and is a pressure reduction range of the first pressure regulating valve 3, and the second pressure difference display means 10 displays a second pressure difference, which is a difference between the pressure of the second pressure detection means 4 and the pressure of the third pressure detection means 7 in the control device L0 and is a pressure reduction range of the flow restriction means 5 or the second pressure regulating valve 6.
Specifically, the value of the first pressure detection device 2 is different from the value of the second pressure detection device 4 in the DCS, the pressure reduction range of the first pressure regulating valve 3 is displayed by the first pressure difference display device 9, and the pressure reduction range of the wafer type flow-limiting orifice plate or the second pressure regulating valve 6 is displayed by the second pressure difference display device 10 when the value of the second pressure detection device 4 is different from the value of the third pressure detection device 7 in the DCS. The first pressure detection device 2 and the first pressure regulating valve 3 form single-loop control in the DCS, and the second pressure detection device 4 and the second pressure regulating valve 6 form single-loop control in the DCS, so that the automatic control of the pressure of the whole system is completed together.
in one embodiment, referring to fig. 2, the steady operation line L1 may further include a first cut-off valve V1 and a second cut-off valve V2. an inlet of the first cut-off valve V1 is connected to an outlet of the first pressure regulating valve 3, an outlet of the first cut-off valve V1 is connected to an inlet of the flow restricting device 5, an inlet of the second cut-off valve V2 is connected to an outlet of the flow restricting device 5, and an outlet of the second cut-off valve V2 is connected to an inlet line of the post-pressure reduction system 8.
the vehicle start-stop pipeline L2 further comprises a third stop valve V3, a fourth stop valve V4., an inlet of a third stop valve V3 is connected with an outlet of the first pressure regulating valve 3, an outlet of the third stop valve V3 is connected with an inlet of the second pressure regulating valve 6, an inlet of the fourth stop valve V4 is connected with an outlet of the second pressure regulating valve 6, and an outlet of the fourth stop valve V4 is connected with an inlet pipeline of the system 8 after pressure reduction.
the control device L0 controls the on-line switching of the start-stop line L2 and the steady operation line L1 by controlling the opening and closing of the first cut-off valve V1, the second cut-off valve V2, the third cut-off valve V3, and the fourth cut-off valve V4.
the first stop valve V1, the second stop valve V2, the third stop valve V3 and the fourth stop valve V4 can play a role in switching a parallel pipeline stable operation pipeline L1 and a start-stop vehicle pipeline L2, optionally, see FIG. 3, because the S-shaped flow channel of the stop valves has a certain throttling function, in order to enable the flow channel to be more smooth and avoid the flow channel from being blocked and washed, the first stop valve V1, the second stop valve V2, the third stop valve V3 and the fourth stop valve V4 of the implementation can be selected as ball valves with full diameters of pipelines, the ball valves are replaced by ball valves, the ball valves and the pipelines have the same diameter, the flow channel is unobstructed, no throttling is generated, and the problems that the stop valves are washed and sealing surfaces are damaged due to throttling are solved.
in the starting stage, before temperature rise and pressure rise, the first stop valve V1 and the second stop valve V2 are closed, the third stop valve V3 and the fourth stop valve V4 are opened, the second pressure regulating valve 6 and the first pressure regulating valve 3 are put into automation, the valve opening is kept at a low valve position at the beginning, the control device L0 gradually increases the given pressure in the single-loop control of the two valves along with the gradual increase of the flow, and the control device L0 tracks the pressure rise curve at the same time, so that the stable rise of the system pressure is realized until the system pressure reaches 23 MPa.
in the stable operation stage, when the system pressure of the first pressure detection device 2 is more than 23MPa, the valve opening of the first pressure regulating valve 3 is automatically adjusted to be larger, the valve opening of the first pressure regulating valve 3 is automatically adjusted to be smaller until the system pressure is more than 23MPa, the valve opening of the first pressure regulating valve 3 is automatically adjusted to be smaller, and the stable opening of the system pressure is adjusted to be smaller than 23MPa, so that the stable opening of the system pressure is detected, and the stable opening of the system pressure is smaller than 23MPa, and the stable opening of the system pressure is detected when the system pressure of the first pressure detection device 2 is more than 23MPa, so that the system pressure is stable, and the service life of the system pressure is seriously influenced.
in addition, when the wafer type flow limiting orifice plate on the stable operation pipeline L1 and the pipeline of the stable operation pipeline L1 are in fault or leak, the control device L0 opens the third stop valve V3 and the fourth stop valve V4, closes the first stop valve V1 and the second stop valve V2, temporarily switches to the start-stop vehicle pipeline L2, switches to the stable operation pipeline L1 after the fault is processed, achieves the complete isolation of the stable operation pipeline L1 and the start-stop vehicle pipeline L2, and achieves the purpose of processing the fault without stopping on line.
In the stopping stage, before the temperature and the pressure are reduced and reduced, the first stop valve V1 and the second stop valve V2 are closed, the third stop valve V3 and the fourth stop valve V4 are opened, the second pressure regulating valve 6 and the first pressure regulating valve 3 are automatically put into operation, the valve opening is kept at a high valve position at the beginning, and the given pressure in the single-loop control of the two valves is gradually reduced along with the gradual reduction of the flow rate so as to realize the stable reduction of the system pressure until the system pressure is reduced to the normal pressure.
in the embodiment, the system mainly comprises a control device L0, a first pressure regulating valve 3, a stable operation pipeline L1 and a start-stop vehicle pipeline L02, a stable operation pipeline L11 comprises a flow limiting device 5, a start-stop vehicle pipeline L22 comprises a second pressure regulating valve 6, the number of pneumatic straight-through valves and pressure transmitters is reduced, the investment cost of the device is reduced, when the reaction device 1 is started, the control device L0 opens the first pressure regulating valve 3 and the start-stop vehicle pipeline L2, when the system pressure and the flow reach preset values, the control device L0 controls the start-stop vehicle pipeline L2 to be switched to the stable operation pipeline L1, the current system pressure is reduced to the normal pressure, the automation level of the pressure control of the supercritical water oxidation technology is improved, the pressure regulation range is expanded, a damping water pump is cancelled, the investment cost of the device is reduced, the consumption of the device is reduced, the problems that a capillary tube pressure reducer is easy to clean, the scale is not easy to scale, the area is large, the investment level of the pressure control of the supercritical water resource is improved, the service life of a flash evaporation system is prolonged, and the service life of the system is prolonged.
Based on the pressure control system of the supercritical water oxidation technology in the above embodiments, the present embodiment further provides a pressure control method for the supercritical water oxidation technology, referring to fig. 4, which is a schematic flow chart of an implementation of the pressure control method for the supercritical water oxidation technology in the present embodiment, and the detailed description is as follows:
Step S401, when the reaction device is started, the first pressure regulating valve and the start-stop pipeline are opened.
Step S402, when the system pressure reaches a preset pressure value and the medium flow reaches a preset flow value, controlling the start-stop vehicle pipeline to be switched to a stable operation pipeline, and regulating the current system pressure to the preset pressure value through the first pressure regulating valve and a flow limiting device on the stable operation pipeline.
Step S403, when the reaction apparatus 1 stops, controlling the stable operation pipeline to switch to the start/stop pipeline, and reducing the current system pressure to the normal pressure by the first pressure regulating valve and the second pressure regulating valve on the start/stop pipeline.
The pressure control method for supercritical water oxidation technology of the present embodiment further includes:
When any one of the flow limiting device and the pipeline on the stable operation pipeline has a fault, the stable operation pipeline is controlled to be switched to the start-stop vehicle pipeline, and the fault is eliminated on line.
And after the fault is eliminated, controlling the stable operation pipeline to start, and controlling the start and stop pipeline to stop.
According to the method, the automation level of pressure control of the supercritical water oxidation technology is improved, the pressure adjusting range is expanded, the damping water pump is omitted, the investment cost of equipment is reduced, the problems that the capillary tube pressure reducer is easy to scale and clean, large in occupied area, high in investment and the like are solved, and the service life of the system is prolonged.
The embodiment also provides a supercritical water oxidation system, which comprises any one of the pressure control systems for supercritical water oxidation technology in the above embodiments, and has the beneficial effects of any one of the pressure control systems for supercritical water oxidation technology.
It is obvious to those skilled in the art that, for convenience and simplicity of description, the foregoing functional units and modules are merely illustrated in terms of division, and in practical applications, the foregoing functional allocation may be performed by different functional units and modules as needed, that is, the internal structure of the circuit is divided into different functional units or modules to perform all or part of the above described functions. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A pressure control system for supercritical water oxidation technology comprises control equipment, a first pressure regulating valve, a stable operation pipeline and a start-stop vehicle pipeline, and is characterized in that an inlet of the first pressure regulating valve is connected with an outlet pipeline of a reaction device;
The stable operation pipeline comprises a flow limiting device, an inlet of the flow limiting device is connected with an outlet of the first pressure regulating valve, and an outlet of the flow limiting device is connected with an inlet pipeline of the system after pressure reduction; the starting and stopping vehicle pipeline comprises a second pressure regulating valve, the inlet of the second pressure regulating valve is connected with the outlet of the first pressure regulating valve, and the outlet of the second pressure regulating valve is connected with the inlet pipeline of the system after pressure reduction;
When the reaction device is started, the control equipment opens the first pressure regulating valve and the start-stop pipeline, when the system pressure reaches a preset pressure value and the medium flow reaches a preset flow value, the control equipment controls the start-stop pipeline to be switched to the stable operation pipeline, and the first pressure regulating valve and the flow limiting device regulate the current system pressure to a preset pressure value;
When the reaction device stops, the control equipment controls the stable operation pipeline to be switched to the starting and stopping pipeline, and the first pressure regulating valve and the second pressure regulating valve reduce the current system pressure to normal pressure.
2. The pressure control system for supercritical water oxidation technology of claim 1 wherein the control apparatus controls the steady operation line to switch to the start-stop line and to perform on-line troubleshooting upon a failure of any one of the flow restricting device and the piping on the steady operation line.
3. The pressure control system for supercritical water oxidation techniques of claim 1 wherein the flow restricting device comprises a plurality of sets of wafer-style flow restricting orifice plates connected in series.
4. The pressure control system for supercritical water oxidation technology of claim 3 wherein each set of wafer-style restriction orifice plates comprises an orifice plate and two flanges;
The pore plate is clamped between the two flanges.
5. The pressure control system for supercritical water oxidation technology of any one of claims 1 to 4, wherein the pressure control system for supercritical water oxidation technology further comprises: a first pressure detection means, a second pressure detection means, and a third pressure detection means;
The first pressure detection device is arranged at the outlet of the reaction device and used for acquiring the pressure before pressure reduction and sending the pressure to the control equipment;
The second pressure detection device is arranged at the outlet of the first pressure regulating valve and used for acquiring the outlet pressure of the first pressure regulating valve and sending the outlet pressure to the control equipment;
The third pressure detection device is arranged at the inlet of the system after pressure reduction and used for acquiring the pressure after pressure reduction and sending the pressure to the control equipment;
And the control equipment controls the on-line switching of the stable operation pipeline and the start-stop pipeline according to the pressure of the first pressure detection device, the pressure of the second pressure detection device and the pressure of the third pressure detection device.
6. The pressure control system for supercritical water oxidation technology of claim 5, further comprising: a first differential pressure display device and a second differential pressure display device;
The first pressure difference display device displays a first pressure difference, wherein the first pressure difference is a difference value between the pressure of the first pressure detection device and the pressure of the second pressure detection device in the control equipment;
The second pressure difference display device displays a second pressure difference, which is a difference between the pressure of the second pressure detection device and the pressure of the third pressure detection device in the control device.
7. The pressure control system for supercritical water oxidation technology of any one of claims 1 to 4 where the stable operation pipeline further comprises: a first stop valve and a second stop valve; the inlet of the first stop valve is connected with the outlet of the first pressure regulating valve, the outlet of the first stop valve is connected with the inlet of the flow limiting device, the inlet of the second stop valve is connected with the outlet of the flow limiting device, and the outlet of the second stop valve is connected with an inlet pipeline of the depressurized system;
The start-stop line further comprises: a third stop valve and a fourth stop valve; an inlet of the third stop valve is connected with an outlet of the first pressure regulating valve, an outlet of the third stop valve is connected with an inlet of the second pressure regulating valve, an inlet of the fourth stop valve is connected with an outlet of the third pressure regulating valve, and an outlet of the fourth stop valve is connected with an inlet pipeline of a system after pressure reduction;
The control device controls the on-line switching of the stable operation pipeline and the start/stop pipeline by controlling the on/off of the first stop valve, the second stop valve, the third stop valve and the fourth stop valve.
8. A pressure control method for supercritical water oxidation technology, which is applied to the pressure control system for supercritical water oxidation technology according to any one of claims 1 to 7, and which comprises:
When the reaction device is started, opening the first pressure regulating valve and the start-stop pipeline;
When the system pressure reaches a preset pressure value and the medium flow reaches a preset flow value, controlling the starting and stopping pipeline to be switched to a stable operation pipeline, and regulating the current system pressure to the preset pressure value through the first pressure regulating valve and a current limiting device on the stable operation pipeline;
When the reaction device stops, the stable operation pipeline is controlled to be switched to the starting and stopping pipeline, and the first pressure regulating valve and a second pressure regulating valve on the starting and stopping pipeline reduce the current system pressure to normal pressure.
9. The pressure control method for supercritical water oxidation technology of claim 8, where the pressure control method for supercritical water oxidation technology further comprises:
And when any one of the flow limiting device and the pipeline on the stable operation pipeline has a fault, controlling the stable operation pipeline to be switched to the starting and stopping pipeline, and removing the fault on line.
10. Supercritical water oxidation system, characterized in that it comprises a pressure control system for supercritical water oxidation technology according to any of claims 1 to 7.
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