CN113440912A - Integrated system and method integrating purge gas treatment and backwash filtration - Google Patents
Integrated system and method integrating purge gas treatment and backwash filtration Download PDFInfo
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- CN113440912A CN113440912A CN202110852051.7A CN202110852051A CN113440912A CN 113440912 A CN113440912 A CN 113440912A CN 202110852051 A CN202110852051 A CN 202110852051A CN 113440912 A CN113440912 A CN 113440912A
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- filter
- purge gas
- backwashing
- valve
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- 238000010926 purge Methods 0.000 title claims abstract description 91
- 238000001914 filtration Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000011001 backwashing Methods 0.000 claims abstract description 81
- 239000011344 liquid material Substances 0.000 claims abstract description 43
- 239000007788 liquid Substances 0.000 claims abstract description 33
- 238000011010 flushing procedure Methods 0.000 claims abstract description 31
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 5
- 238000009530 blood pressure measurement Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 8
- 238000012824 chemical production Methods 0.000 abstract description 5
- 239000003245 coal Substances 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 21
- 239000012535 impurity Substances 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000010410 layer Substances 0.000 description 6
- 239000012071 phase Substances 0.000 description 6
- 238000005201 scrubbing Methods 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 4
- 230000007774 longterm Effects 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000002344 surface layer Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/114—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements arranged for inward flow filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
- B01D29/52—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection
- B01D29/54—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection arranged concentrically or coaxially
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/60—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration
- B01D29/606—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration by pressure measuring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
- B01D29/68—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
Abstract
The invention relates to the technical field of filtration treatment of liquid materials in coal chemical industry, and particularly provides a system and a method integrating purge gas treatment and backwashing filtration. A system integrating purge gas treatment and backwash filtration comprises a filter, a filter core and a filter body, wherein the filter core is arranged in the filter; the backwashing unit is positioned at the inlet side of the filter and comprises a purge gas backwashing valve and a purge gas flow block which is controlled by the purge gas backwashing valve and is led into the filter; and the dirty oil tank is positioned on the outlet side of the filter, and a back-flushing discharge valve is arranged at the inlet of the dirty oil tank to receive the back-flushing gas-liquid mixture discharged from the filter. The problems that liquid is adopted for backwashing at present in chemical production, the backwashing effect is poor, the service life of a filter element is seriously shortened, and pollution gas needs to be additionally treated when gas is adopted for backwashing, namely, the liquid backwashing and the gas backwashing both have high cost are solved.
Description
Technical Field
The invention relates to the technical field of filtration treatment of liquid materials in coal chemical industry, and particularly provides a system and a method integrating purge gas treatment and backwashing filtration.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Many liquid materials in the coal chemical production process need to be filtered, a filtering device generally adopts a traditional backwashing filter, when the filtering differential pressure reaches a limit value, the filtering device uses the filtered liquid materials to carry out reverse flushing, in the prior art, a liquid flushing mode is adopted for carrying out backwashing, the backwashing effect is poor, impurities adhered to a filter layer cannot be effectively flushed, and the liquid materials are discharged along with the impurities during backwashing, so that the liquid materials are seriously wasted. For example, coal-based paraffin and high-low temperature condensate which are intermediate products in oil production by coal indirect liquefaction both contain a small amount of catalyst fine powder, and filtration pretreatment is required before hydrofining to remove the catalyst fine powder, because the catalyst fine powder gradually forms a black colloidal substance with strong viscosity in the filtration process and adheres to the surface layer of a filter element, backwashing is performed by using a filtered liquid material, the catalyst fine powder is difficult to effectively remove, the backwashing effect is poor, not only is the filtration period shorter and shorter, but also the backwashing frequency is higher and higher, and the filtration capacity of the liquid material is gradually reduced, the backwashing dirty oil discharge amount is gradually increased, the stable operation of a system is affected, and finally the filter element has to be replaced, so that the production cost is overhigh.
For this reason, the prior art also employs gas for backwashing, but the inventors have found that the backwashing using gas requires additional treatment of the contaminated gas, and the cost is still too high.
Disclosure of Invention
The problems that liquid is adopted for backwashing, the backwashing effect is poor, the service life of a filter element is seriously shortened, and pollution gas needs to be additionally treated when gas is adopted for backwashing in the prior chemical production, namely, the liquid backwashing and the gas backwashing both have high cost are solved.
Therefore, the chemical backwashing filtering system can effectively remove impurities on the surface layer of the filter element, quickly recover the filtering capacity of the filter element, reduce the influence on the filtering period and the backwashing frequency, increase the filtering capacity and the recovery rate of liquid materials, reduce the discharge amount of backwashing sump oil, prolong the service life of the filter element, effectively utilize the purge gas and the volatile gas of the liquid materials, and reduce the production cost.
Specifically, in one or some embodiments of the invention, the invention provides an integrated system integrating purge gas treatment and backwashing filtration, which comprises a filter, a filter core and a filter body, wherein the filter core is arranged in the filter;
the backwashing unit is positioned at the inlet side of the filter and comprises a purge gas backwashing valve and a purge gas flow block which is controlled by the purge gas backwashing valve 6 and is introduced into the filter;
and the dirty oil tank is positioned on the outlet side of the filter, and a back-flushing discharge valve is arranged at the inlet of the dirty oil tank to receive the back-flushing gas-liquid mixture discharged from the filter.
In one or some embodiments of the present invention, a method integrating purge gas treatment and backwash filtration is provided, where the method is performed in the system integrating purge gas treatment and backwash filtration, and includes the following steps:
introducing liquid material from the inlet of the filter, flowing out the filtered liquid material from the outlet of the filter, stopping introducing or discharging the liquid material after running for a period of time, simultaneously opening a purge gas back-flushing valve, introducing purge gas into the filter, mixing the purge gas with the liquid material to disturb the filter element, discharging the liquid material in the filter after back-flushing for a period of time, only performing the purge gas back-flushing,
the purge gas is discharged from the filter into a sump tank where it is collected.
One or some of the above technical solutions have the following advantages or beneficial effects:
1) the invention uses the purge gas to back flush the filter, avoids the waste of raw materials caused by back flushing by using gas or liquid materials, and can also change waste into valuable by using the purge gas discharged in the production process; and the purge gas and the backwash oil stain after backwashing are recycled together, so that the separate treatment of the purge gas or the backwash oil stain is avoided.
2) The invention recycles the volatile gas and the purge gas generated by the liquid material in the back washing process, burns the volatile gas and the purge gas, recycles the heat and saves the fuel and the production cost.
3) During back flushing, the filter core is subjected to gas pressurization, gas-liquid mixed back flushing, gas back flushing and gas side scrubbing in sequence, the steps are matched with each other, so that the back flushing effect is good, adhered impurities on the surface layer of the filter core can be quickly and effectively removed, the filter core can quickly recover the filtering capacity, the influence on the filtering period and the back flushing frequency is reduced, the long-period stable operation of the system is ensured, the service life of the filter core is prolonged, and the production cost is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic flow chart of the present invention.
Fig. 2 is a schematic view of the internal structure of the filter of the present invention.
FIG. 3 is a schematic view of the internal structure of the dirty oil tank of the present invention.
Wherein: 1. a filter; 2. a sump oil tank; 3. a filter inlet valve; 4. a filter outlet valve; 5. a differential pressure transmitter; 6. a purge gas back flush valve; 7. backwashing the discharge valve; 8. a gas venting check valve; 9. a heat tracing system; 10. a sump oil tank feeding interface; 11. an emptying interface; 12. a right angle baffle; 13. a sump oil tank discharge port; 14. a safety valve interface; 15. an inspection manhole; 16. a filter discharge port; 17. a filter feed interface; 18. a filter element; 19. an upper fixing plate; 20. a lower fixing plate; 21. a bolt; 22. an inner ring at the lower part of the filter; 23. an upper inner ring of the filter; 24. a safety valve; 25. sealing the end; 26. and a controller.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The problems that liquid is adopted for backwashing, the backwashing effect is poor, the service life of a filter element is seriously shortened, and pollution gas needs to be additionally treated when gas is adopted for backwashing in the prior chemical production, namely, the liquid backwashing and the gas backwashing both have high cost are solved.
In one or some embodiments of the invention, a system integrating purge gas treatment and backwashing filtration is provided, which comprises a filter 1, a filter core 18 is arranged in the filter;
the backwashing unit is positioned at the inlet side of the filter 1 and comprises a purge gas backwashing valve 6 and a purge gas flow block which is controlled by the purge gas backwashing valve 6 and is introduced into the filter 1;
and the dirty oil tank 2 is positioned at the outlet side of the filter 1, and a back flush discharge valve 7 is arranged at the inlet of the dirty oil tank 2 to receive the back flush gas-liquid mixture discharged from the filter 1.
It should be understood that the purge gas flow block is an abstract concept, i.e. purge gas that can be introduced into the filter 1, specifically a purge gas storage tank, or a process purge gas discharge channel can be directly connected.
The filter 1 is used for filtering materials, and obviously comprises a material inlet and a material outlet, wherein the materials enter from the material inlet and are filtered and then exit from the material outlet, the material inlet and the material outlet can be directly the material inlet and the material outlet, the purge gas back flush valve 6 is controlled to control the introduction of the purge gas, specifically, the back flush valve 6 is closed to introduce the materials, after a period of time, the introduction of the materials is stopped, the back flush valve 6 is opened, the purge gas is introduced, and the back flush of the filter 1 is carried out.
Or, the filter 1 has at least two inlets, including a purge gas inlet and a material inlet; the two inlets are not interfered with each other, and the material is a chemical production material; similarly, the filter 1 has at least two outlets including a backwashing gas-liquid mixture outlet and a material outlet, the material enters from the material inlet of the filter 1 and exits from the material outlet, the purge gas enters from the purge gas inlet, and the backwashing gas-liquid mixture outlet.
Preferably, the purge gas inlet is arranged at the same side of the material outlet, and the purge gas outlet is arranged at the same side of the material inlet and is in reverse backwashing, so that the flushing efficiency can be improved.
Preferably, a controller 26 is also included;
a differential pressure transmitter 5 is installed between an inlet and an outlet of the filter 1, and the differential pressure transmitter 5 transmits a differential pressure signal to a controller 26.
The invention provides one of the control modes as follows: the differential pressure transmitter 5 is physically deformed inside the controller 26 according to the pressure change at both sides of the filter 1, thereby generating some special effects, and generating a series of automatic control elements for switching on or off actions, or electronic elements under different pressure induction and different principles of working states to provide pressure data for the circuit so as to collect the pressure data.
Preferably, the controller 26 transmits control signals to the respective valves to control the valves to open and close.
Preferably, a heat tracing system 9 is installed on the pipeline between the filter 1 and the sump oil tank 2.
Preferably, liquid material conveying pipelines are installed at the inlet and the outlet of the filter 1, and a heat tracing system 9 is installed on the liquid material conveying pipelines.
Preferably, as shown in fig. 2, the filter 1 is a vertical filter structure, and has an upper fixing plate 19 and a lower fixing plate 20 in a container space, and a filter element 18 is fixed between the upper fixing plate 19 and the lower fixing plate 20.
Preferably, a seal head 25 is arranged above the filter 1.
Preferably, a filter outlet port 16 is arranged above the filter 1, and a filter inlet port 17 is arranged below the filter 1.
Preferably, as shown in fig. 3, the slop oil tank 2 is of a vertical structure, a plurality of right-angle baffles 12 are arranged in the container space from top to bottom, the right-angle baffles 12 are composed of transverse plates and vertical plates, and the vertical plates are downward;
the plurality of right angle baffles 12 are staggered.
Preferably, the right-angle baffle 12 is three, the gas phase flows to the upper part, the three right-angle baffles 12 form an S shape, tiny liquid drops in the gas phase are blocked and intercepted, the liquid drops flow downwards along the upper surface and the lower surface of the right-angle baffle 12 after being collected, the dirty oil tank 2 collects the gas phase from the upper part, and collects the liquid phase from the lower part, so that gas-liquid separation is realized.
Preferably, the side of the sump oil tank 2 is provided with a sump oil tank feeding interface 10, the upper part is provided with an emptying interface 11, and the lower part is provided with a sump oil tank discharging interface 13.
It is further preferred that the flare system is externally connected to the vent 11 to burn the generated gas.
In one or some embodiments of the present invention, a method integrating purge gas treatment and backwash filtration is provided, where the method is performed in the system integrating purge gas treatment and backwash filtration, and includes the following steps:
introducing liquid material from the inlet of the filter 1, flowing out the filtered liquid material from the outlet of the filter 1, stopping introducing or discharging the liquid material after running for a period of time, simultaneously opening the purge gas back flush valve 6, introducing purge gas into the filter 1, mixing the purge gas with the liquid material to disturb the filter element 18, discharging the liquid material in the filter 1 after back flushing for a period of time, only performing the back flushing of the purge gas,
the purge gas is discharged from the filter 1 into the sump 2 and collected in the sump 2.
During back flushing, the filter core is subjected to gas pressurization, gas-liquid mixed back flushing, gas back flushing and gas side scrubbing in sequence, the steps are matched with each other, so that the back flushing effect is good, adhered impurities on the surface layer of the filter core can be quickly and effectively removed, the filter core can quickly recover the filtering capacity, the influence on the filtering period and the back flushing frequency is reduced, the long-period stable operation of the system is ensured, the service life of the filter core is prolonged, and the production cost is reduced.
In the invention, the gas-liquid mixed backwashing and the gas backwashing are in a matching relationship, and the gas-liquid mixed backwashing and the gas backwashing cooperate to realize the long-term operation of the filter 1, thereby meeting the requirement of long-term operation of the system. One of the steps is reduced, so that the filtering capacity of the liquid material in the filter 1 is greatly reduced.
Preferably, the method also comprises a pressure measuring step, wherein when the differential pressure transmitter 5 detects that the differential pressure on two sides of the filter 1 exceeds a certain pressure or reaches a certain length during operation, the filter inlet valve 3 and the filter outlet valve 4 are closed, the purge gas back flush valve 6 is opened, and when the pressure is increased to a set pressure, the back flush discharge valve 7 is opened;
preferably, when the differential pressure transmitter detects that the differential pressure exceeds 0.2Mpa or the operation time reaches 4 hours, the purge gas back flush valve 6 is opened;
preferably, when the differential pressure exceeds 0.5Mpa, the purge gas backwash valve 6 is opened.
Preferably, the method further comprises the following backwash ending control steps: after backwashing for a period of time, the controller 26 sends out a control signal, the purge gas backwashing valve 6 is closed first, then the backwashing discharge valve 7 is closed, after backwashing is finished, the controller 26 sends out a control signal, the system is switched to a filtering state again, and the steps are circulated continuously;
preferably, the backwashing time is 5-30s, preferably 10 s.
Example 1
As shown in fig. 1-3, the present embodiment provides an integrated system for purge gas treatment and backwash filtration, which includes a filter 1 and a dirty oil tank 2, the bottom of the filter 1 is communicated with a filter feed port 17, the upper portion of the filter 1 is a head 25, the top of the head 25 is communicated with a filter discharge port 16, the lower portion of the inner side of the filter 1 is provided with a filter lower inner ring 22, the filter lower inner ring 22 is provided with a lower fixing plate 20, the lower fixing plate 20 is fastened and sealed by bolts 21, the upper end surface of the lower fixing plate 20 is fixed to the lower end of a filter element 18, the upper end of the filter element 18 is pressed and fixed by an upper fixing plate 19, the filtering precision of the filter element 18 is 20 μm, the upper fixing plate 19 is mounted on the filter upper inner ring 23, the upper fixing plate 19 is fastened and sealed by bolts 21, the filter feed port 17 is simultaneously connected with a filter inlet valve 3 and a backwash discharge valve 7 through a pipeline, filter discharge interface 16 passes through the pipeline and connects filter outlet valve 4 and purge gas back flush valve 6 simultaneously, back flush bleeder valve 7 passes through pipe connection sump oil tank feeding interface 10, sump oil tank feeding interface 10 intercommunication sump oil tank 2, 2 top intercommunication blowdown interfaces 11 and relief valve interface 14 of sump oil tank, gaseous blowdown check valve 8 is connected to blowdown interface 11, relief valve interface 14 connects relief valve 24, 2 inboard upper portions of sump oil tank are equipped with three right angle baffles 12, 2 bottom intercommunication sump oil tank discharge interface 13 of sump oil tank, 2 outside lower parts of sump oil tank set up maintenance manhole 15.
Example 2
The embodiment provides an integrated method of purge gas treatment and backwash filtration, which is performed in the integrated system of purge gas treatment and backwash filtration described in embodiment 1, and comprises the following steps:
before use, the end socket 25 of the filter 1 is opened, the lower fixing plate 20 is installed on the lower inner ring 22 of the filter and is tightly sealed by the bolts 21, then the lower end of the filter element 18 is fixed on the lower fixing plate 20, the upper fixing plate 19 presses and fixes the upper end of the filter element 18, and is tightly sealed with the upper inner ring 23 by the bolts 21, and finally the end socket 25 of the filter 1 is installed again.
Before the system is put into use, all valves are in a closed state, the gas emptying one-way valve 8 and the safety valve 24 of the slop oil tank 2 are checked to be normal, and the heat tracing system 9 is put into use. After the system is put into use, the system firstly enters a filtering state, the controller 26 sends out a control signal, firstly the outlet valve 4 of the filter is opened, then the inlet valve 3 of the filter is opened, the filter 1 starts to work to filter liquid materials, the liquid materials enter the filter 1 through the filter feeding interface 17 and enter the filter 1 from the outer side through the filter element 18, the filtered liquid materials are discharged through the filter discharging interface 16, the differential pressure transmitter 5 monitors the differential pressure of the inlet and outlet pipelines of the filter at any time and transmits the monitoring signal to the controller 26, when the differential pressure reaches 0.2MPa or the running time reaches 4 hours along with the increase of the differential pressure and the running time, the system starts to be switched to a pressurizing state, the controller 26 sends out a control signal, the inlet valve 3 and the outlet valve 4 of the filter are closed, the purge gas back-flushing valve 6 is opened, the interior of the filter 1 is pressurized to 0.5MPa, disturbing the filter element when the purge gas and the liquid material are mixed to enable the adhered impurities of the filter layer to be loose to a certain degree, sending a control signal by a controller 26 after pressurizing for 8 seconds, opening a back washing discharge valve 7, starting to switch the system to a back washing state, firstly, reversely washing the filter element 18 by gas-liquid mixing, laterally scrubbing gas and liquid along the surface of the filter element 18, back washing for a period of time, only reversely washing gas after no liquid material exists in the filter 1, laterally scrubbing gas along the surface of the filter element 18 to remove the adhered impurities of the filter layer, sending the back washing gas-liquid mixture into a sump tank 2 through a back washing discharge valve 7 and a pipeline, enabling the liquid phase in the gas-liquid mixture to flow downwards and the gas phase to flow upwards, forming an S shape by three right-angle baffles 12, blocking the tiny liquid drops in the gas phase, enabling the liquid drops to flow downwards along the upper and lower surfaces of the right-angle baffles 12 after being collected, and (3) delivering the residual gas phase into a boiler through a gas emptying one-way valve 8 for combustion to recover heat, when the interior of the sump oil tank 2 is in overpressure, automatically opening a safety valve 24 to release pressure to a torch system, delivering sump oil stored at the lower part of the sump oil tank 2 to a subsequent treatment system through a sump oil tank discharging port 13, sending a control signal by a controller 26 after backwashing is carried out for 10 seconds, closing a purge gas backwashing valve 6, then closing a backwashing discharging valve 7, finishing backwashing, sending the control signal by the controller 26, switching the system to a filtering state again, and continuously circulating according to the steps.
Example 3
The embodiment provides a method integrating purge gas treatment and backwash filtration, which is different from embodiment 2 in that during backwash, only gas backwash is performed, that is, when the differential pressure reaches 0.2MPa or the operation time reaches 4 hours, the system starts to be switched to a pressurized state, the controller 26 sends a control signal, the filter inlet valve 3 is closed, after all liquid materials are discharged, the purge gas backwash valve 6 is opened, the interior of the filter 1 is pressurized to 0.5MPa, the filter element is disturbed when purge gas and the liquid materials are mixed, so that the filter layer adhered impurities are loosened to a certain extent, the controller 26 sends a control signal after 8 seconds of pressurization, the backwash discharge valve 7 is opened, the system starts to be switched to a backwash state, only gas backwash is performed, and lateral gas scrubbing is performed along the surface of the filter element 18, so that the filter layer adhered impurities are removed.
By contrast, after 100 backwashing times with the method described in example 2, the filtration capacity of the liquid material is reduced by no more than 5%, and after 60 backwashing with the method described in example 3, the filtration capacity of the liquid material is reduced by more than 20%.
Obviously, the need for backwashing the filter 1 cannot be met by merely performing gas backwashing.
Example 4
The embodiment provides a method integrating purge gas treatment and backwash filtration, which is different from embodiment 2 in that during backwash, only liquid backwash is performed, that is, when the differential pressure reaches 0.2MPa or the operation time reaches 4 hours, the system starts to be switched to a pressurized state, the controller 26 sends out a control signal, the filter inlet valve 3 and the filter outlet valve 4 are closed, the purge gas backwash valve 6 is opened, the interior of the filter 1 is pressurized to 0.5MPa, the filter element is disturbed when purge gas and liquid materials are mixed, so that impurities adhered to the filter layer are loosened to a certain extent, the controller 26 sends out a control signal after 8 seconds of pressurization, the backwash discharge valve 7 is opened, the system starts to be switched to a backwash state, the filter element 18 is backwashed by gas-liquid mixing, and scrubbing is performed laterally by gas-liquid along the surface of the filter element 18, and backwash is performed for a period of time.
By contrast, the liquid feed filtration decreased by more than 25% after 60 backwashes as described in example 4.
Obviously, the backwashing requirement of the filter 1 cannot be met only by performing gas-liquid backwashing.
From the comparison between the embodiment 2 and the embodiments 3 and 4, the gas-liquid back flushing and the gas back flushing are in a matching relationship, and the gas-liquid back flushing and the gas back flushing cooperate with each other to realize the long-term operation of the filter 1, so that the requirement of long-term operation of the system can be met.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.
Claims (10)
1. A system integrating purge gas treatment and backwash filtration is characterized in that: comprises a filter (1) containing a filter element (18);
the backwashing unit is positioned at the inlet side of the filter (1) and comprises a purge gas backwashing valve (6) and a purge gas flow block which is controlled by the purge gas backwashing valve (6) and is introduced into the filter (1);
and the sump oil tank (2) is positioned on the outlet side of the filter (1), and a back flush discharge valve (7) is arranged at the inlet of the sump oil tank (2) to receive a back flush gas-liquid mixture discharged from the filter (1).
2. The integrated system of purge gas treatment and backwash filtration as claimed in claim 1, wherein: further comprising a controller (26);
a differential pressure transmitter (5) is installed between an inlet and an outlet of the filter (1), and the differential pressure transmitter (5) transmits a differential pressure signal to a controller (26).
3. The integrated system of purge gas treatment and backwash filter as claimed in claim 2, wherein: the controller (26) transmits control signals to the valves to control the valves to open and close, respectively.
4. The integrated system of purge gas treatment and backwash filtration as claimed in claim 1, wherein: and a heat tracing system (9) is arranged on a pipeline between the filter (1) and the sump oil tank (2).
5. The integrated system of purge gas treatment and backwash filtration as claimed in claim 1, wherein: liquid material conveying pipelines are arranged at the inlet and the outlet of the filter (1), and a heat tracing system (9) is arranged on the liquid material conveying pipelines;
preferably, the filter (1) is a vertical filter structure, an upper fixing plate (19) and a lower fixing plate (20) are arranged in the container space, and a filter element (18) is fixed between the upper fixing plate (19) and the lower fixing plate (20).
6. The integrated system of purge gas treatment and backwash filter as claimed in claim 5, wherein: a seal head (25) is arranged above the filter (1);
preferably, a filter outlet interface (16) is arranged above the filter (1), and a filter inlet interface (17) is arranged below the filter (1).
7. The integrated system of purge gas treatment and backwash filtration as claimed in claim 1, wherein: the dirty oil tank (2) is of a vertical structure, a plurality of right-angle baffles (12) are arranged in a container space from top to bottom, each right-angle baffle (12) consists of a transverse plate and a vertical plate, and each vertical plate faces downwards;
the plurality of right-angle baffles (12) are arranged in a staggered manner;
preferably, the side of the sump oil tank (2) is provided with a sump oil tank feeding interface (10), the upper part is provided with an emptying interface (11), and the lower part is provided with a sump oil tank discharging interface (13).
8. A method integrating purge gas treatment and backwashing filtration is characterized in that: the integrated method of the purge gas treatment and the backwash filtration is carried out in the integrated system of the purge gas treatment and the backwash filtration as claimed in any one of claims 1 to 7, and comprises the following steps:
introducing liquid materials from an inlet of the filter (1), discharging the filtered liquid materials from an outlet of the filter (1), stopping introducing or discharging the liquid materials after running for a period of time, simultaneously opening a purge gas back-flushing valve (6), introducing purge gas into the filter (1), mixing the purge gas with the liquid materials to disturb the filter element (18), discharging the liquid materials in the filter (1) after back-flushing for a period of time, and only performing purge gas back-flushing,
the purge gas is discharged from the filter (1) into the sump (2) and collected in the sump (2).
9. The integrated method of purge gas treatment and backwash filtration as claimed in claim 8, wherein: the method also comprises a pressure measurement step, wherein when a differential pressure transmitter (5) detects that the differential pressure on two sides of the filter (1) exceeds a certain pressure or reaches a certain length during operation, the filter inlet valve (3) and the filter outlet valve (4) are closed, the purge gas back flush valve (6) is opened, and the back flush discharge valve (7) is opened when the pressure is increased to a set pressure;
preferably, when the differential pressure transmitter detects that the differential pressure exceeds 0.2Mpa or the operation time reaches 4 hours, the purge gas back flush valve (6) is opened;
preferably, when the differential pressure exceeds 0.5MPa, the purge gas back flush valve (6) is opened.
10. The integrated method of purge gas treatment and backwash filtration as claimed in claim 8, wherein: the method also comprises a backwashing end control step: after backwashing for a period of time, the controller (26) sends out a control signal, the purge gas backwashing valve (6) is closed first, then the backwashing discharge valve (7) is closed, after the backwashing is finished, the controller (26) sends out a control signal, the system is switched to a filtering state again, and the steps are circulated continuously;
preferably, the backwashing time is 5-30s, preferably 10 s.
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| CN202110852051.7A CN113440912A (en) | 2021-07-27 | 2021-07-27 | Integrated system and method integrating purge gas treatment and backwash filtration |
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| CN202110852051.7A CN113440912A (en) | 2021-07-27 | 2021-07-27 | Integrated system and method integrating purge gas treatment and backwash filtration |
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| CN203737016U (en) * | 2013-12-12 | 2014-07-30 | 中国石油化工股份有限公司 | Coal gas blowback device for PSA analytical gas |
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| CN210964275U (en) * | 2019-10-29 | 2020-07-10 | 上海市特种设备监督检验技术研究院 | Energy-conserving efficient separation container |
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| CN103623667A (en) * | 2013-10-31 | 2014-03-12 | 高密市万和车桥有限公司 | Oil-gas separator |
| CN203737016U (en) * | 2013-12-12 | 2014-07-30 | 中国石油化工股份有限公司 | Coal gas blowback device for PSA analytical gas |
| CN207056068U (en) * | 2017-08-14 | 2018-03-02 | 新能能源有限公司 | A kind of methanol filtration system |
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