CN114838237A - Device and method for plugging inlet and outlet pipelines of catalytic oil slurry pump by forced cooling and paraffin injection - Google Patents
Device and method for plugging inlet and outlet pipelines of catalytic oil slurry pump by forced cooling and paraffin injection Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000002347 injection Methods 0.000 title claims abstract description 18
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- 238000010438 heat treatment Methods 0.000 claims abstract description 47
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
- F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe
- F16L55/164—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a sealing fluid being introduced in the pipe
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G11/00—Catalytic cracking, in the absence of hydrogen, of hydrocarbon oils
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/08—Cooling; Heating; Preventing freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L53/00—Heating of pipes or pipe systems; Cooling of pipes or pipe systems
- F16L53/70—Cooling of pipes or pipe systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/084—Pipe-line systems for liquids or viscous products for hot fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/14—Conveying liquids or viscous products by pumping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/16—Facilitating the conveyance of liquids or effecting the conveyance of viscous products by modification of their viscosity
- F17D1/18—Facilitating the conveyance of liquids or effecting the conveyance of viscous products by modification of their viscosity by heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
Abstract
The invention discloses a device and a method for plugging an inlet and outlet pipeline of a catalytic oil slurry pump by forced cooling and paraffin injection, and belongs to the technical field of maintenance of petrochemical equipment. The paraffin wax injection device is characterized in that solid paraffin wax is added into a container filled with paraffin wax, the container filled with paraffin wax is heated through a heating mechanism, the paraffin wax in the container is converted into liquid, then the liquid paraffin wax is injected into an oil slurry unit, related pipelines of the oil slurry unit are forcibly cooled through a cooling mechanism, paraffin wax solidification is waited, and physical plugging of inner leakage positions of the oil slurry unit is achieved through paraffin wax solidification. The device of the invention can quickly and quantitatively inject the paraffin into the oil slurry pump (the liquid paraffin enters the inlet pipeline and the outlet pipeline through the inlet valve and the outlet valve of the inner leakage), and apply the forced cooling measure of the inlet pipeline and the outlet pipeline, and utilize the characteristics of high paraffin solidification temperature and no component pollution to the catalytic product to quickly solidify the paraffin and cleanly realize the physical plugging of the inner leakage part, thereby leading the oil slurry pump to achieve the safe overhaul condition.
Description
Technical Field
The invention belongs to the technical field of maintenance of petrochemical equipment, and particularly relates to a device and a method for plugging an inlet and outlet pipeline of a catalytic oil slurry pump by forced cooling and paraffin injection.
Background
The catalytic cracking device is a core device of an oil refining enterprise, has obvious influence on material balance, heat balance, fuel balance and the like of the oil refining enterprise, and has a high position in an oil refining processing total flow. After entering the riser reactor, the catalytic raw oil and the regenerated catalyst with qualified activity pass through the riser reactor at high speed, and the catalytic cracking reaction is completed within a few seconds. Usually, the outlet of the riser reactor is used for realizing the rapid separation of the reacted mixed oil gas and the catalyst through a cyclone separator, the spent catalyst enters a regenerator for regeneration, and the mixed oil gas enters a fractionating tower for product cutting and separation. With the technical progress, the separation efficiency of the cyclone separator at the outlet of the riser reactor is continuously improved, the amount of solid catalyst particles entering oil gas is continuously reduced, and a certain amount of solid catalyst particles are inevitably carried in mixed oil gas. The specification of China petrochemical industry is that the solid content control index in the oil slurry is not more than 6 g/L. After entering the fractionating tower, the catalyst particles enter the bottom of the fractionating tower along with the heavy components and become solid particles mixed in the bottom oil slurry. During normal production, the oil slurry is pumped out from the bottom of the fractionating tower by an oil slurry pump and exchanges heat with raw materials of a catalytic device and the like, so that the heat balance of the fractionating tower is realized. The high-temperature oil slurry containing solid particles flows at high speed in the system, and scouring abrasion is generated on an oil slurry pump body, a pipeline, a valve and the like. On one hand, the abrasion can cause the erosion and thinning of the equipment pipeline, possibly cause the leakage of the equipment pipeline and cause safety accidents such as fire and the like; on the other hand, valve plates such as an inlet valve, an outlet valve and a preheating valve of the oil slurry pump are abraded, the valve is leaked, the oil slurry pump cannot be safely isolated, and overhauling is affected. The above problem has become one of the major problems affecting the long-term operation of catalytic devices.
In order to prevent the abrasion of the solid particles to the oil slurry system, the prior art adopts targeted measures on the design material selection, such as: the oil slurry pipeline (including an inlet pipeline, an outlet pipeline and a preheating pipeline) adopts Cr5Mo, so that the wear resistance of the pipeline is improved; the oil slurry pump adopts a wear-resistant lining, so that the wear resistance of the pump body is improved; the inlet valve and the outlet valve of the oil slurry pump adopt wear-resistant valve plates, so that the wear resistance of the valve plates is improved. Although the wear resistance of equipment and pipelines is improved by the measures, the actual wear is still serious due to the objective existence of solid catalyst particles, particularly the flow rate of an outlet of an oil slurry pump is high, the valve plate of the outlet valve is worn more seriously, and the valve is easy to leak inwards; in extreme cases, internal leakage of the inlet valve can also occur. Challenges are presented to the safe maintenance of slurry pumps.
CN103982739B discloses a high-temperature slurry pump preheating process, which introduces clean recycle oil (temperature 300 ℃) without catalyst particles as a preheating medium, and adopts a flow-limiting orifice plate to ensure that the flow rate of the preheating medium is no more than 5m/s, thereby preventing the erosion of a slurry pump system in the preheating process. CN204981766U discloses a device for preventing preheating wear of a catalytic cracking slurry pump, which maintains a standby pump in a standby state by optimizing pump and pipeline heat preservation and injecting 350# heat conducting oil into the standby pump. In the prior art, the erosion of the slurry oil system, particularly the preheating system, can be reduced by optimizing the process flow and the construction scheme. However, no measure is provided for safely isolating the oil slurry pump under the condition that the inlet and outlet valves and the preheating valve leak internally, so that the oil slurry pump reaches the maintenance condition.
Wuhan petrochemical plant has studied the freezing process to prevent leakage of the outlet valve of slurry pump and to repair mechanical seal (oil refining equipment design, 05 th 1983, Zhang Jian). Removing upper and lower pipelines of an outlet valve of an oil slurry pump, preserving heat, and quenching the pipelines with cold water; secondly, an iron sheet sleeve is additionally arranged at the part of the pipeline where the heat preservation is removed, a gap of 30-50mm is formed between the iron sheet sleeve and the pipeline, the gap is filled with crushed ice, and oil slurry in the pipeline is further frozen; thirdly, after the oil slurry in the pipeline is indeed frozen, 3 measures such as loosening the flange of the outlet of the pump, adding a blind plate and the like are taken, so that the oil slurry pump which leaks in the outlet valve and cannot be normally and safely isolated can reach the safe maintenance condition. The technical method is a temporary measure, the effectiveness and the safety of the method cannot be guaranteed, and the method has higher safety risk when the method is used at an oil slurry pump with high probability of leakage in the valve and serious accident consequences.
In summary, although the prior art makes certain progress in preventing internal leakage of related valves of the slurry pump and temporarily blocking internal leakage valves, when internal leakage occurs at the inlet and outlet valves of the slurry pump, there is still a technical problem that the backup slurry pump cannot be safely isolated from the system.
Disclosure of Invention
One of the purposes of the invention is to provide a device for plugging and catalyzing inlet and outlet pipelines of an oil slurry pump by forced cooling and paraffin injection, which can still reliably plug the inlet and outlet pipelines and safely isolate the oil slurry pump when the inlet and outlet valves of the oil slurry pump simultaneously leak inwards.
The paraffin is quickly and quantitatively injected into the oil slurry pump (the liquid paraffin enters the inlet pipeline and the outlet pipeline through the inlet valve and the outlet valve of the inner leakage), the inlet pipeline and the outlet pipeline are put into use for forced cooling, and the paraffin is quickly solidified by utilizing the characteristics that the paraffin solidification temperature is high and components cannot pollute a catalytic product, so that the physical plugging of the inner leakage part is realized in a clean manner, and the oil slurry pump can reach the safe maintenance condition.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a forced cooling shutoff catalysis slurry pump inlet and outlet pipeline's device, its includes the slurry unit, still includes:
a container filled with paraffin for holding paraffin wax;
the heating mechanism is used for heating the container filled with the paraffin and melting the solid paraffin in the container;
the cooling mechanism is used for cooling related pipelines of the oil slurry unit by taking chilled water as a forced cooling medium;
and the paraffin metering pump and the conveying pipeline are used for conveying the melted paraffin to the slurry unit.
As a preferred embodiment of the present invention, in the above device for plugging and catalyzing the inlet and outlet pipelines of the slurry pump by forced cooling, the related pipelines of the slurry unit are mainly the inlet and outlet pipelines of the slurry pump, and the inlet and outlet pipelines of the slurry pump are forced cooled, so that the liquid paraffin therein is rapidly converted into the solid paraffin, thereby isolating the related slurry pump.
As another preferred embodiment of the present invention, in the above apparatus for plugging the inlet and outlet pipelines of the catalytic slurry pump by forced cooling, the slurry unit includes a catalytic fractionating tower, and a slurry pump a and a slurry pump B located at two sides of the bottom of the catalytic fractionating tower, wherein one slurry pump is used as a backup pump, the bottom of the catalytic fractionating tower is connected to a main pipeline, the end of the main pipeline is divided into a first branch pipeline and a second branch pipeline, the slurry pump a is connected to the first branch pipeline, and the slurry pump B is connected to the second branch pipeline.
Further, a fractionating tower bottom electric valve is arranged on the main pipeline, and an oil slurry pump A inlet valve and an oil slurry pump A inlet filter are arranged on the first branch pipeline; and an inlet valve of the oil slurry pump B and an inlet filter of the oil slurry pump B are arranged on the second branch pipeline.
The device for plugging the inlet and outlet pipelines of the catalytic slurry pump through forced cooling is characterized in that an outlet pipeline of the slurry pump A is further provided with an outlet one-way valve of the slurry pump A and an outlet valve of the slurry pump A, and the slurry pump A is further connected with an outlet vent valve of the slurry pump A.
The device for plugging the inlet and outlet pipelines of the catalytic slurry pump by forced cooling is characterized in that an outlet pipeline of the slurry pump B is also provided with an outlet one-way valve of the slurry pump B and an outlet valve of the slurry pump B, and the slurry pump B is also connected with an outlet emptying valve of the slurry pump B.
The forced cooling plugging device for the inlet and outlet pipelines of the catalytic slurry pump is characterized in that the slurry pump A and the slurry pump B are both connected with preheating valves, the slurry pump A and the slurry pump B are preheated through respective preheating valves, at least four preheating valves are arranged, and at least three preheating valves are connected in series.
The device for plugging the inlet and outlet pipelines of the oil slurry pump by forced cooling comprises an inlet valve front pipeline of the oil slurry pump A, an outlet valve rear pipeline of the oil slurry pump A, an inlet valve front pipeline of the oil slurry pump B and an outlet valve rear pipeline of the oil slurry pump B, wherein the inlet valve front pipeline of the oil slurry pump A is used for cooling the inlet pipeline of the oil slurry pump A, the outlet valve rear pipeline of the oil slurry pump A is used for cooling the outlet pipeline of the oil slurry pump A, the inlet valve front pipeline of the oil slurry pump B is used for cooling the inlet pipeline of the oil slurry pump B, and the outlet valve rear pipeline of the oil slurry pump B is used for cooling the outlet pipeline of the oil slurry pump B.
The device for plugging the inlet and outlet pipelines of the catalytic slurry pump by forced cooling is characterized in that two front pipelines of the inlet valve of the slurry pump A are arranged, one of the front pipelines is provided with the chilled water inlet valve of the slurry pump A, and the other front pipeline is provided with the chilled water outlet valve of the inlet valve of the slurry pump A; two front pipelines of the inlet valve of the oil slurry pump B are arranged, one of the front pipelines is provided with a chilled water inlet valve of the front pipeline of the inlet valve of the oil slurry pump B, and the other one is provided with a chilled water outlet valve of the front pipeline of the inlet valve of the oil slurry pump B; two pipelines are arranged behind the outlet valve of the oil slurry pump A, one pipeline is provided with a pipeline chilled water inlet valve behind the outlet valve of the oil slurry pump A, and the other pipeline is provided with a pipeline chilled water outlet valve behind the outlet valve of the oil slurry pump A; two pipelines are arranged behind the outlet valve of the oil slurry pump B, one pipeline is provided with a chilled water inlet valve behind the outlet valve of the oil slurry pump B, and the other pipeline is provided with a chilled water outlet valve behind the outlet valve of the oil slurry pump B.
The device for plugging the inlet and outlet pipelines of the catalytic slurry pump by forced cooling is characterized in that the heating mechanism heats the outer wall of the container filled with paraffin, and the heating mode adopts steam heat tracing or electric heat tracing.
Foretell forced cooling shutoff catalysis stuff pump inlet and outlet pipeline's device, foretell container that is equipped with paraffin is a tank structure, be provided with heating coil on foretell tank structure's outer wall, the one end of foretell heating coil is connected with temperature regulating valve, foretell heating mechanism is from taking temperature controller, through the temperature of temperature controller monitoring container, then adjust it through temperature regulating valve, heat and keep warm the container that is equipped with paraffin through foretell heating coil, still be connected with the steam trap on the heating coil of the one end of keeping away from foretell temperature regulating valve.
Foretell forced cooling shutoff catalysis slurry pump is imported and exported device of pipeline, its bottom of the container of being equipped with paraffin is provided with the export, and this export is connected to slurry pump A export atmospheric valve and slurry pump B export atmospheric valve respectively through corresponding pipeline.
The device for plugging the inlet and outlet pipelines of the catalytic slurry pump by forced cooling is characterized in that a paraffin metering pump is arranged at the position close to the outlet of the bottom of a container filled with paraffin, and liquid paraffin is injected into the slurry pump A/the slurry pump B through the paraffin metering pump.
The invention also aims to provide a method for forcibly cooling and plugging the inlet and outlet pipelines of the catalytic slurry pump, which comprises the steps of heating a container filled with paraffin through a heating mechanism, converting the paraffin into liquid, then injecting the liquid paraffin into a slurry unit, forcibly cooling the related pipelines of the slurry unit through a cooling mechanism, waiting for the paraffin to solidify, and physically plugging the inner leakage part of the slurry unit through the paraffin solidification.
Specifically, the method sequentially comprises the following steps:
s1, heating the container with the paraffin by a heating mechanism, and keeping the temperature for a period of time after the paraffin is completely melted;
s2, closing a related inlet valve, an outlet valve and a preheating valve of the oil slurry pump, wherein a discharge valve at the outlet of the oil slurry pump is communicated with an outlet pipeline of the paraffin metering pump;
s3, starting a chilled water inlet valve and a chilled water outlet valve on cold inlet and outlet pipelines of the oil slurry pump, and throwing chilled water to cool the pipelines;
s4, starting a paraffin metering pump to inject liquid paraffin into the slurry pump, stopping the paraffin metering pump after sufficient injection, and closing an emptying valve at the outlet of the slurry pump;
s5, after determining that the paraffin is completely solidified, detaching flanges of related valves and installing blind plates, carrying out purging replacement on the slurry pump, and carrying out qualified maintenance operation;
and S6, after the overhaul is finished, removing the blind plate, restoring the connection of the related inlet valve, outlet valve and preheating valve of the slurry pump, and disconnecting the discharge valve of the outlet of the slurry pump from the paraffin metering pump, so that the slurry pump can be normally used.
Further, the standard for judging the internal leakage of the inlet and outlet valves is as follows: after the inlet and outlet valves and the preheating valve are closed, the temperature of the pump body of the oil slurry pump is not obviously reduced, which indicates that the high-temperature oil slurry still forms a flowing state in the pump body.
Compared with the prior art, the invention has the following beneficial technical effects:
in the prior art, the erosion of an oil slurry system (including a valve) can be reduced by adopting recycled oil without solid particles as a preheating medium or adopting a 350# heat transfer oil injection standby pump as a technical means for realizing the hot standby of an oil slurry pump; once the valve leaks, temporary measures such as watering or ice compress are taken to cool the outlet pipeline so as to promote the solidification of oil slurry in the pipeline for plugging. In fact, as the solidification temperature of the oil slurry is generally below 5 ℃, the temporary measures adopted can not really ensure whether the oil slurry in the pipeline is reduced below the solidification temperature, and are difficult to guarantee; if the inlet valve and the outlet valve of the oil slurry pump leak simultaneously, the technical scheme of temporarily taking the condensation of the frozen oil slurry is not feasible.
The invention adopts paraffin as an isolation medium, and is mainly based on two factors: (1) the paraffin has higher solidification temperature and the melting temperature of 47-64 ℃. (2) The main component of the paraffin is C 18 ～C 30 The straight-chain alkane (80-95 percent), a small amount of alkane with individual branched chains and monocycloparaffine with long side chains are effective petroleum components, and can not cause product pollution, and the paraffin is close to the components in the fractionating tower, so that the fractionating tower can not be subjected to large-scale operation fluctuation. After the standby pump is overhauled, paraffin stored in the system does not need to be replaced, only the system heat tracing pipeline needs to be put into use, the paraffin is heated and melted into liquid and enters the bottom of the fractionating tower along with oil slurry, and therefore the system is not polluted, and operation fluctuation cannot be caused.
The invention cools the inlet and outlet pipelines through the cooling mechanism, adopts chilled water as a forced cooling medium, mainly considers that the chilled water of an oil refinery is easy to obtain, has the temperature below 5 ℃, and has good cooling effect.
When the inlet valve and the outlet valve of the oil slurry pump simultaneously leak, the invention can still reliably seal the inlet pipeline and the outlet pipeline to safely isolate the oil slurry pump, paraffin is quickly and quantitatively injected into the oil slurry pump (liquid paraffin also enters the inlet pipeline and the outlet pipeline through the inlet valve and the outlet valve of the inner leak) through the device of the invention, forced cooling measures of the inlet pipeline and the outlet pipeline are put into use, and the paraffin is quickly solidified and the physical sealing of the inner leak part is cleanly realized by utilizing the characteristics that the paraffin solidification temperature is high and components can not pollute catalytic products, thereby leading the oil slurry pump to achieve safe maintenance conditions.
In conclusion, the liquid paraffin is injected into the oil slurry pump, the pump body is gradually filled with the liquid paraffin, the liquid paraffin is filled into the outlet pipe section through the outlet valve, the liquid paraffin is filled into the inlet pipe section through the inlet valve, the liquid paraffin is changed into the solid paraffin after the liquid paraffin reaches the solidification temperature, and therefore the inner leakage part of the oil slurry unit is physically blocked.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a process flow diagram of the present invention for plugging the inlet and outlet pipelines of a catalytic oil slurry pump by forced cooling and paraffin injection;
in the figure:
1. a catalytic fractionating tower 2, an electrically operated valve at the bottom of the fractionating tower 3, an inlet valve of an oil slurry pump A, 4, an inlet filter of the oil slurry pump A, 5, an inlet valve of an oil slurry pump B, 6, an inlet filter of the oil slurry pump B, 7, an outlet check valve of the oil slurry pump A, 8, an oil slurry pump B, 9, an outlet check valve of the oil slurry pump A, 10, an outlet valve of the oil slurry pump A, 11, an outlet check valve of the oil slurry pump B, 12, an outlet valve of the oil slurry pump B, 13, an outlet blow-off valve of the oil slurry pump A, 14, an outlet blow-off valve of the oil slurry pump B, 15-18, a preheating valve of the oil slurry pump A, 19-22, a preheating valve of the oil slurry pump B, 23, a paraffin heating tank, 24, a paraffin metering pump, 25, a temperature regulating valve, 26, a steam trap, 27, a heating coil, 28, a rear pipeline chilled water inlet valve of the oil slurry pump A, 29, a rear pipeline chilled water outlet valve of the oil slurry pump A, a rear pipeline water outlet valve, 30, a rear pipeline chilled water inlet valve of the oil slurry pump B, 31. the system comprises a chilled water outlet valve of a pipeline behind an outlet valve of the oil slurry pump B, 32 chilled water inlet valves of pipelines in front of the inlet valves of the oil slurry pump A, 33 chilled water outlet valves of pipelines in front of the inlet valves of the oil slurry pump A, 34 chilled water inlet valves of pipelines in front of the inlet valves of the oil slurry pump B, 35 chilled water outlet valves of pipelines in front of the inlet valves of the oil slurry pump B.
Detailed Description
The invention provides a device and a method for plugging an inlet and outlet pipeline of a catalytic oil slurry pump by forced cooling and paraffin injection, and the invention is described in detail below by combining specific embodiments in order to make the advantages and technical scheme of the invention clearer and clearer.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
Spatially relative terms, such as "below," "lower," "upper," "above," "upper," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the object in use or operation in addition to the orientation depicted in the figures. For example, if the items in the figures are turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the elements or features. Thus, the exemplary term "below" can encompass both an orientation of below and above. Other orientations of the components are possible (rotated 90 degrees or at other orientations) and the spatially relative terms used herein should be interpreted accordingly.
The grade of the paraffin wax can be selected from 52#, 54#, 56#, 58# and the like, and the grade represents a melting point.
As shown in figure 1, the device for plugging and catalyzing the inlet and outlet pipelines of the slurry pump by forced cooling and paraffin injection comprises a slurry unit, a container filled with paraffin, a heating mechanism, a conveying pipeline and a cooling mechanism.
The slurry unit comprises a catalytic fractionating tower 1, and a slurry pump A7 and a slurry pump B8 which are positioned at the two sides of the bottom of the catalytic fractionating tower, wherein one slurry pump is used as a standby pump, and the other slurry pump is normally used. The bottom of the catalytic fractionating tower is connected with a main pipeline, a fractionating tower bottom electric valve 2 is arranged on the main pipeline, the connection and the closing of the pipelines are controlled through the valve, the tail end of the main pipeline is divided into a first branch pipeline and a second branch pipeline, the slurry pump A is connected to the first branch pipeline, and the slurry pump B is connected to the second branch pipeline.
An inlet valve 3 of the oil slurry pump A and an inlet filter 4 of the oil slurry pump A are arranged on the first branch pipeline; an inlet valve 5 of the oil slurry pump B and an inlet filter 6 of the oil slurry pump B are arranged on the second branch pipeline; and an outlet check valve 9 of the oil slurry pump A and an outlet valve 10 of the oil slurry pump A are also arranged on an outlet pipeline of the oil slurry pump A, and the oil slurry pump A is also connected with an outlet vent valve 13 of the oil slurry pump A.
And the outlet pipeline of the oil slurry pump B is also provided with an outlet one-way valve 11 of the oil slurry pump B and an outlet valve 12 of the oil slurry pump B, and the oil slurry pump B is also connected with an outlet emptying valve 14 of the oil slurry pump B.
The oil slurry pump A and the oil slurry pump B are both connected with preheating valves, for example, preheating valves 15-18 of the oil slurry pump A and preheating valves 19-22 of the oil slurry pump B are used for preheating the oil slurry pump A and the oil slurry pump B through the preheating valves. The preheating valves are provided with four, and three of the preheating valves are connected in series.
The heating mechanism heats the outer wall of the container filled with the paraffin, and the heating mode adopts steam heat tracing or electric heat tracing, for example, when the steam heat tracing mode is adopted, a heating coil 27 can be arranged on the outer wall of the paraffin container, one end of the heating coil is connected with a temperature regulating valve 25, the heating mechanism is provided with a temperature controller, the temperature of the container is monitored by a temperature monitor, then the container is regulated by a temperature regulating valve, the heating coil is used for heating and insulating the container filled with the paraffin, a steam trap 26 is also connected to the heating coil at the end far away from the temperature regulating valve, the container filled with the paraffin is preferably of a tank structure, such as a paraffin heating tank 23, the bottom of the container filled with the paraffin is provided with an outlet, the outlet is respectively connected to an outlet air release valve of the oil slurry pump A and an outlet air release valve of the oil slurry pump B through corresponding pipelines.
A paraffin measuring pump 24 is provided at a position near the outlet of the bottom of the container containing paraffin, and liquid paraffin is injected into the slurry pump a/the slurry pump B through the paraffin measuring pump 24.
The cooling mechanism comprises a front pipeline of an inlet valve of the slurry pump A, a rear pipeline of an outlet valve of the slurry pump A, a front pipeline of an inlet valve of the slurry pump B and a rear pipeline of an outlet valve of the slurry pump B, wherein the front pipeline of the inlet valve of the slurry pump A is used for cooling the inlet pipeline of the slurry pump A, the rear pipeline of the outlet valve of the slurry pump A is used for cooling the outlet pipeline of the slurry pump A, the front pipeline of the inlet valve of the slurry pump B is used for cooling the inlet pipeline of the slurry pump B, and the rear pipeline of the outlet valve of the slurry pump B is used for cooling the outlet pipeline of the slurry pump B.
The device for plugging the inlet and outlet pipelines of the catalytic slurry pump by forced cooling is characterized in that two front pipelines of the inlet valve of the slurry pump A are arranged, one of the front pipelines is provided with a chilled water inlet valve 32 of the front pipeline of the inlet valve of the slurry pump A, and the other one is provided with a chilled water outlet valve 33 of the front pipeline of the inlet valve of the slurry pump A; two front pipelines of the inlet valve of the oil slurry pump B are arranged, one of the front pipelines is provided with a chilled water inlet valve 34 of the front pipeline of the inlet valve of the oil slurry pump B, and the other one is provided with a chilled water outlet valve 35 of the front pipeline of the inlet valve of the oil slurry pump B; two pipelines are arranged behind the outlet valve of the oil slurry pump A, one pipeline is provided with a chilled water inlet valve 28 behind the outlet valve of the oil slurry pump A, and the other pipeline is provided with a chilled water outlet valve 29 behind the outlet valve of the oil slurry pump A; two pipelines are arranged behind the outlet valve of the oil slurry pump B, one pipeline is provided with a chilled water inlet valve 30 behind the outlet valve of the oil slurry pump B, and the other pipeline is provided with a chilled water outlet valve 31 behind the outlet valve of the oil slurry pump B.
The present invention is further illustrated by the following specific examples.
Example 1:
the operation temperature of the bottom of the fractionating tower is up to above 320 ℃, and after the inlet and outlet valves of the standby slurry pump leak inwards at the same time, the standby slurry pump cannot be safely isolated and overhauled from the system. The standard for judging the internal leakage of the inlet and outlet valves is as follows: after the inlet valve, the outlet valve and the preheating valve are closed, the temperature of the pump body is not obviously reduced, which indicates that the high-temperature slurry still forms a flowing state in the pump body. The plugging and isolating are carried out according to the following steps:
(1) adding the paraffin wax into a paraffin wax heating tank 23, opening a temperature regulating valve 25, slowly heating the paraffin wax solid to melt the paraffin wax solid, and after the temperature is raised to the paraffin wax melting temperature, keeping the temperature for more than 1 hour through a temperature control loop to ensure that the paraffin wax in the tank is completely melted.
(2) And closing the steam tracing pipes of the inlet pipeline, the outlet pipeline and the preheating pipeline of the oil slurry pump A.
(3) Closing inlet valve, outlet valve and preheating valve of oil slurry pump A Note 1 。
(4) And connecting an outlet vent valve of the oil slurry pump A with an outlet pipeline of the paraffin measuring pump, and opening an outlet vent valve 13 of the standby oil slurry pump A.
(5) And (3) starting a pipeline chilled water inlet valve 28 behind the outlet valve of the slurry pump A, a pipeline chilled water outlet valve 29 behind the outlet valve of the slurry pump A, a pipeline chilled water inlet valve 32 in front of the inlet valve of the slurry pump A and a pipeline chilled water outlet valve 33 in front of the inlet valve of the slurry pump A, and throwing chilled water to cool the pipelines.
(6) Start the paraffin measuring pump 24 Note 2 Injecting liquid paraffin into the spare pump, and injecting enough paraffin Note three And then stopping the paraffin metering pump 24, and closing the vent valve 13 at the outlet of the oil slurry pump A.
(7) Determining paraffin waxHas completely solidified Note four And then, mounting a blind plate after detaching a flange of the valve (after detaching an inlet valve of the oil slurry pump A, before detaching an outlet valve of the oil slurry pump A and after detaching a preheating valve 18 of the oil slurry pump A), and then carrying out purging replacement on the oil slurry pump. And (5) after the product is qualified, carrying out maintenance operation.
(8) And after the overhaul is finished, the blind plate is removed, the inlet and outlet of the oil slurry pump A, the preheating pipeline and the like are restored to be connected, and the connection between the vent valve 13 at the outlet of the oil slurry pump A and the paraffin metering pump 24 is disconnected.
(10) And (5) the oil slurry pump A enters a standby step.
Note that: after the valve is completely closed, the injected liquid paraffin enters the connecting pipeline through the internal leakage valve. The determination of which valve is leaking internally can be analyzed by the change in the external temperature of the pipeline to which the valve is connected, for example: after the liquid paraffin is injected into the pump body of the pipeline behind the outlet valve of the standby slurry pump, the outer surface temperature of the outlet pipeline is measured by an infrared thermometer to be obviously reduced, and then the internal leakage of the outlet valve can be judged; if the external surface temperature of the inlet pipeline and the preheating pipeline is kept unchanged, the inlet valve and the preheating valve are judged to have no internal leakage.
Note two: the maximum flow of the paraffin wax metering pump is selected according to the proportion of not less than 3 times/hour of the total volume from the back of the inlet valve of the slurry pump to the front of the outlet valve, so that paraffin wax can be ensured to be rapidly injected into the system, and the paraffin wax is prevented from being solidified at the injection line and other parts.
Third, note: the injection amount of the liquid paraffin is not less than 3 times of the total volume from the inlet valve of the slurry pump to the front of the outlet valve, and the injection amount is calculated by a metering pump.
And D, injecting: the judgment standard of paraffin wax complete solidification is that the working condition of the system is kept unchanged, and the temperature of the pump body does not rise after the forced cooling is stopped for 1 hour.
Example 2:
the device is used for plugging the inlet and outlet pipelines of the catalytic slurry pump, and the specific method comprises the following steps:
firstly, heating a container filled with paraffin by a heating mechanism, and keeping the temperature for a period of time after the paraffin is completely melted;
secondly, closing a related inlet valve, an outlet valve and a preheating valve of the oil slurry pump, wherein an outlet vent valve of the oil slurry pump is communicated with an outlet pipeline of the paraffin measuring pump;
thirdly, opening a chilled water inlet valve and a chilled water outlet valve on cold inlet and outlet pipelines of the oil slurry pump, and feeding chilled water to cool the pipelines;
fourthly, starting a paraffin metering pump to inject liquid paraffin into the oil slurry pump, stopping the paraffin metering pump after sufficient injection, and closing an emptying valve at the outlet of the oil slurry pump;
fifthly, after determining that the paraffin is completely solidified, detaching flanges of related valves and installing blind plates, carrying out purging replacement on the slurry pump, and carrying out maintenance operation after the slurry pump is qualified;
and sixthly, after the overhaul is finished, removing the blind plate, restoring the connection of the relevant inlet valve, outlet valve and preheating valve of the slurry oil pump, disconnecting the discharge valve of the outlet of the slurry oil pump from the paraffin metering pump 24, and normally using the slurry oil pump.
Example 3:
and (3) when the oil slurry pump B at the bottom of a certain catalytic fractionation tower normally operates, the oil slurry pump A needs to be overhauled, and when the conditions that the inlet valve 3 of the oil slurry pump A, the outlet valve 10 of the oil slurry pump A and the preheating valves 15-18 of the oil slurry pump A are all closed are found in the process of cutting off a pump, the temperature of the pump body of the oil slurry pump A is not obviously reduced, and the condition that the inlet valve and the outlet valve of the pump are both internally leaked is judged. The operating temperature of the bottom of the fractionating tower is 332 ℃ and the solidification temperature of the oil slurry is about 5 ℃.
The following further explains the overall blocking isolation and operation steps by taking the example that when the oil slurry pump A is cut out for maintenance, the inlet valve 3 of the oil slurry pump A, the outlet valve 10 of the oil slurry pump A and the outlet one-way valve 9 of the oil slurry pump A all leak inwards.
(1) Adding solid paraffin into the paraffin heating tank 23, opening the paraffin tank temperature regulating valve 25, slowly heating paraffin solid to melt, and when the temperature rises to a melting point (the mark of paraffin is the melting point), keeping the temperature for more than 1 hour through a temperature control loop to ensure that the paraffin in the tank is completely melted.
(2) And closing the steam tracing pipe of the inlet and outlet pipeline and the preheating pipeline of the oil slurry pump A.
(3) And closing an inlet valve of the oil slurry pump A, an outlet valve of the oil slurry pump A and preheating valves 15-18 of the oil slurry pump A.
(4) And connecting the vent valve 13 at the outlet of the oil slurry pump A with the outlet pipeline of the paraffin metering pump 24, opening the vent valve 13 at the outlet of the oil slurry pump A, and tracing heat of the inlet pipeline and the outlet pipeline of the paraffin metering pump 24.
(5) And (3) starting a paraffin metering pump 24 to inject liquid paraffin into the slurry pump A, wherein the injection amount of the liquid paraffin is not less than 3 times of the total volume from the inlet valve of the slurry pump A to the front of the outlet, and the injection amount is metered by the paraffin metering pump 24.
(6) Firstly, a chilled water inlet valve 32 of a front pipeline of an inlet valve of the oil slurry pump A and a chilled water outlet valve 33 of a front pipeline of an inlet valve of the oil slurry pump A are opened, and injected liquid paraffin enters a pump inlet pipeline through the pump inlet valve which leaks inwards due to lower pressure of a pump inlet, and the inlet paraffin is solidified under the action of forced cooling. At this time, the injected liquid paraffin enters the outlet pipeline of the oil slurry pump A through the outlet valve 10 of the oil slurry pump A with inner leakage.
(7) And starting a pipeline chilled water inlet valve 28 behind the outlet valve of the oil slurry pump A and a pipeline chilled water inlet valve 29 behind the outlet valve of the oil slurry pump A, and solidifying the liquid paraffin entering the outlet pipeline of the pump under the forced cooling action, wherein the outlet pressure of the paraffin metering pump cannot exceed 3 MPa.
(8) And stopping the paraffin wax metering pump 24, and closing the vent valve 13 at the outlet of the oil slurry pump A.
(9) Keeping the working condition of the system unchanged, stopping forcibly cooling for 1 hour, judging that the paraffin in the pump body is completely solidified if the temperature of the pump body of the slurry pump A is not increased. After the paraffin is determined to be completely solidified, the flange of the valve is disassembled (after the inlet valve 3 of the oil slurry pump A is disassembled, before the outlet valve 10 of the oil slurry pump A is disassembled, after the preheating valve 18 of the oil slurry pump A is disassembled) and a blind plate is installed, and the physical plugging of the system is completed. And (5) purging and replacing the oil slurry pump, and handing over to maintenance operation after the oil slurry pump is qualified.
(10) After the overhaul is finished, the blind plate installed above is removed, the forced cooling copper tube is removed, the inlet and outlet of the oil slurry pump A, the preheating pipeline and the like are restored to be connected, the heat preservation is restored, and the connection between the outlet vent valve 13 of the oil slurry pump A and the paraffin metering pump 24 is disconnected.
(11) The oil slurry pump A is used for sealing oil (light diesel oil components) until the pressure of a pump body does not rise any more, and the sealing leakage condition of the oil slurry pump is tested; if no abnormity is detected, mechanical seal cooling steam is used.
(12) And (3) heating the pipeline A of the slurry oil pump, and gradually heating and melting the solid paraffin solidified in the inlet pipeline and the outlet pipeline to be mixed with the slurry oil to form a part of a process medium. And opening an inlet valve 3 of the oil slurry pump A and an outlet vent valve 13 of the oil slurry pump A (connected with closed discharge), allowing the oil slurry to enter a pump body for replacing leakage testing and oil sealing, and filling the pump, wherein the oil slurry pump A is in a standby state. Note that: the preheating temperature is required to be not more than 50 ℃/h.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto.
Although terms such as slurry pump a, slurry pump B, slurry pump a outlet valve, slurry pump B outlet check valve, heating coil, etc. are used more generally herein, the possibility of using other terms is not excluded, and these terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
It is further understood that the specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (16)
1. The utility model provides a forced cooling shutoff catalysis slurry pump is imported and exported device of pipeline, its includes the slurry unit, its characterized in that still includes:
a container filled with paraffin for holding paraffin wax;
the heating mechanism is used for heating the container filled with the paraffin and melting the solid paraffin in the container;
the cooling mechanism is used for cooling related pipelines of the oil slurry unit by taking chilled water as a forced cooling medium;
and the paraffin metering pump and the conveying pipeline are used for quantitatively conveying the melted paraffin to the slurry unit.
2. The device for plugging the inlet and outlet pipelines of the catalytic slurry pump by forced cooling as claimed in claim 1, wherein: the related pipelines of the slurry oil unit are mainly inlet and outlet pipelines of the slurry oil pump, and the inlet and outlet pipelines of the slurry oil pump are forcibly cooled, so that the liquid paraffin in the slurry oil is quickly converted into the solid paraffin, and the related slurry oil pump is isolated.
3. The device for plugging the inlet and outlet pipelines of the catalytic slurry pump by forced cooling as claimed in claim 2, wherein: the oil slurry unit comprises a catalytic fractionating tower and an oil slurry pump A and an oil slurry pump B which are positioned on two sides of the bottom of the catalytic fractionating tower, wherein one oil slurry pump is used as a standby pump, the bottom of the catalytic fractionating tower is connected with a main pipeline, the tail end of the main pipeline is divided into a first branch pipeline and a second branch pipeline, the oil slurry pump A is connected on the first branch pipeline, and the oil slurry pump B is connected on the second branch pipeline.
4. The device for plugging the inlet and outlet pipelines of the catalytic slurry pump by forced cooling as claimed in claim 3, wherein: a bottom electric valve of the fractionating tower is arranged on the main pipeline, and an inlet valve of the slurry pump A and an inlet filter of the slurry pump A are arranged on the first branch pipeline; and an inlet valve of the oil slurry pump B and an inlet filter of the oil slurry pump B are arranged on the second branch pipeline.
5. The device for plugging the inlet and outlet pipelines of the catalytic slurry pump by forced cooling as claimed in claim 3, wherein: the outlet pipeline of the oil slurry pump A is also provided with an oil slurry pump A outlet one-way valve and an oil slurry pump A outlet valve, and the oil slurry pump A is also connected with an oil slurry pump A outlet vent valve.
6. The device for plugging the inlet and outlet pipelines of the catalytic slurry pump by forced cooling as claimed in claim 3, wherein: the outlet pipeline of the oil slurry pump B is also provided with an outlet one-way valve of the oil slurry pump B and an outlet valve of the oil slurry pump B, and the oil slurry pump B is also connected with an outlet vent valve of the oil slurry pump B.
7. The device for plugging the inlet and outlet pipelines of the catalytic slurry pump by forced cooling as claimed in claim 3, wherein: the oil slurry pump A and the oil slurry pump B are both connected with preheating valves, the oil slurry pump A and the oil slurry pump B are preheated through respective preheating valves, the number of the preheating valves is at least four, and at least three preheating valves are connected in series.
8. The device for plugging the inlet and outlet pipelines of the catalytic slurry pump by forced cooling as claimed in claim 3, wherein: the cooling mechanism include be used for carrying out the oil slurry pump A inlet valve front line that cools down to oil slurry pump A inlet line department, carry out the oil slurry pump A outlet valve rear line that cools down to oil slurry pump A outlet line department, carry out the oil slurry pump B inlet valve front line that cools down and carry out the oil slurry pump B outlet valve rear line that cools down to oil slurry pump B inlet line department.
9. The device for plugging the inlet and outlet pipelines of the catalytic slurry pump by forced cooling as claimed in claim 8, wherein: two front pipelines of the inlet valve of the slurry pump A are arranged, one of the front pipelines is provided with a chilled water inlet valve of the slurry pump A, and the other one is provided with a chilled water outlet valve of the front pipeline of the inlet valve of the slurry pump A; two front pipelines of the inlet valve of the oil slurry pump B are arranged, one of the front pipelines is provided with a front pipeline chilled water inlet valve of the oil slurry pump B, and the other front pipeline is provided with a front pipeline chilled water outlet valve of the inlet valve of the oil slurry pump B; two pipelines are arranged behind the outlet valve of the oil slurry pump A, one pipeline is provided with a pipeline chilled water inlet valve behind the outlet valve of the oil slurry pump A, and the other pipeline is provided with a pipeline chilled water outlet valve behind the outlet valve of the oil slurry pump A; two pipelines are arranged behind the outlet valve of the oil slurry pump B, one pipeline is provided with a chilled water inlet valve behind the outlet valve of the oil slurry pump B, and the other pipeline is provided with a chilled water outlet valve behind the outlet valve of the oil slurry pump B.
10. The device for plugging the inlet and outlet pipelines of the catalytic slurry pump by forced cooling as claimed in any one of claims 1 to 9, wherein: the heating mechanism heats the outer wall of the container filled with paraffin, and the heating mode adopts steam heat tracing or electric heat tracing.
11. The device for plugging the inlet and outlet pipelines of the catalytic slurry pump by forced cooling as claimed in claim 10, wherein: the container that is equipped with paraffin be a tank structure's outer wall on be provided with heating coil, heating coil's one end be connected with temperature regulating valve, heating mechanism from taking temperature controller, through the temperature of temperature controller monitoring container, then adjust it through temperature regulating valve, through heating coil heat and keep warm to the container that is equipped with paraffin, keep away from the heating coil of temperature regulating valve's one end on still be connected with the steam trap.
12. The device for plugging the inlet and outlet pipelines of the catalytic slurry pump by forced cooling as claimed in claim 11, wherein: the bottom of the container filled with the paraffin is provided with an outlet which is respectively connected to an outlet vent valve of the oil slurry pump A and an outlet vent valve of the oil slurry pump B through corresponding pipelines.
13. The apparatus for plugging inlet and outlet pipelines of catalytic slurry pumps by forced cooling as claimed in claim 12, wherein: and the paraffin metering pump is arranged at the position close to the outlet at the bottom of the container filled with paraffin, and liquid paraffin is injected into the oil slurry pump A/the oil slurry pump B through the paraffin metering pump.
14. A method for plugging the inlet and outlet pipelines of a catalytic oil slurry pump by forced cooling is characterized in that: the container filled with paraffin is heated by a heating mechanism, the paraffin in the container is converted into liquid, the liquid paraffin is injected into an oil slurry unit, related pipelines of the oil slurry unit are forcibly cooled by a cooling mechanism, the paraffin is waited to be solidified, and the physical plugging of the inner leakage part of the oil slurry unit is realized by the paraffin solidification.
15. The method for plugging the inlet and outlet pipelines of the catalytic oil slurry pump by forced cooling as claimed in claim 14, wherein the method comprises the following steps: the forced cooling device for plugging an inlet and an outlet pipeline of a catalytic oil slurry pump is adopted, and the method sequentially comprises the following steps:
s1, heating the container with the paraffin by a heating mechanism, and keeping the temperature for a period of time after the paraffin is completely melted;
s2, closing a related inlet valve, an outlet valve and a preheating valve of the oil slurry pump, wherein a discharge valve at the outlet of the oil slurry pump is communicated with an outlet pipeline of the paraffin metering pump;
s3, starting a chilled water inlet valve and a chilled water outlet valve on cold inlet and outlet pipelines of the oil slurry pump, and throwing chilled water to cool the pipelines;
s4, starting a paraffin metering pump to inject liquid paraffin into the slurry pump, stopping the paraffin metering pump after sufficient injection, and closing an emptying valve at the outlet of the slurry pump;
s5, after determining that the paraffin is completely solidified, detaching flanges of related valves and installing blind plates, carrying out purging replacement on the slurry pump, and carrying out qualified maintenance operation;
and S6, after the overhaul is finished, removing the blind plate, restoring the connection of the related inlet valve, outlet valve and preheating valve of the slurry pump, and disconnecting the discharge valve of the outlet of the slurry pump from the paraffin metering pump, so that the slurry pump can be normally used.
16. The method for plugging the inlet and outlet pipelines of the catalytic oil slurry pump by forced cooling as claimed in claim 15, wherein the criterion for judging the internal leakage of the inlet and outlet valves is as follows: after the inlet and outlet valves and the preheating valve are closed, the temperature of the pump body of the slurry pump is not obviously reduced, which indicates that the high-temperature slurry still forms a flowing state in the pump body.
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| CN202110133437.2A CN114838237A (en) | 2021-02-01 | 2021-02-01 | Device and method for plugging inlet and outlet pipelines of catalytic oil slurry pump by forced cooling and paraffin injection |
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| CN202110133437.2A CN114838237A (en) | 2021-02-01 | 2021-02-01 | Device and method for plugging inlet and outlet pipelines of catalytic oil slurry pump by forced cooling and paraffin injection |
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| CN111622777A (en) * | 2020-04-29 | 2020-09-04 | 河南工程学院 | Mine water disaster treatment device and method |
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| GB256567A (en) * | 1925-08-06 | 1927-03-16 | Eugene Clay Furman | Improvements in method and apparatus for repairing fluid containers |
| GB1496911A (en) * | 1974-07-22 | 1978-01-05 | Neratoom | Method of vacuum-sealing each of the first ends of a number of hollow transport means terminating in a header and a method of detecting leaks |
| JPH02150595A (en) * | 1988-11-30 | 1990-06-08 | Nippon Steel Corp | Repairing method for gas pipe |
| US6416692B1 (en) * | 2000-03-10 | 2002-07-09 | Jeffrey L. Iwasaki-Higbee | Sewer system pipe repairs |
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