CN105864093A - Multistage centrifugal high pressure liquefied hydrocarbon pump - Google Patents

Multistage centrifugal high pressure liquefied hydrocarbon pump Download PDF

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Publication number
CN105864093A
CN105864093A CN201610378791.0A CN201610378791A CN105864093A CN 105864093 A CN105864093 A CN 105864093A CN 201610378791 A CN201610378791 A CN 201610378791A CN 105864093 A CN105864093 A CN 105864093A
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China
Prior art keywords
pump
pipe assembly
chamber
pressure
balance
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CN201610378791.0A
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CN105864093B (en
Inventor
孙森森
李作俊
沈水钦
夏益洪
池庆杰
李良特
张华杰
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ZHEJIANG KE'ER PUMP SHARE CO Ltd
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ZHEJIANG KE'ER PUMP SHARE CO Ltd
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/04Shafts or bearings, or assemblies thereof
    • F04D29/041Axial thrust balancing
    • F04D29/0413Axial thrust balancing hydrostatic; hydrodynamic thrust bearings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/06Multi-stage pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0005Control, e.g. regulation, of pumps, pumping installations or systems by using valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0005Control, e.g. regulation, of pumps, pumping installations or systems by using valves
    • F04D15/0022Control, e.g. regulation, of pumps, pumping installations or systems by using valves throttling valves or valves varying the pump inlet opening or the outlet opening
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0077Safety measures
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/08Sealings
    • F04D29/086Sealings especially adapted for liquid pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/66Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/669Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/70Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/708Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type

Abstract

The invention relates to a multistage centrifugal high pressure liquefied hydrocarbon pump. The multistage centrifugal high pressure liquefied hydrocarbon pump comprises an axial force balance mechanism, a mechanical seal self-flushing mechanism and a rotating shaft, wherein a liquid return hole is formed in a first-stage middle section of the pump, a second-stage middle section sealing rubber ring is arranged between a second-stage middle section of the pump and an outer barrel, and a suction box body sealing rubber ring is arranged among a suction box body, the outer barrel and the first-stage middle section; one end of a balance liquid return pipe assembly is connected with a balance chamber, and the other end of the balance liquid return pipe assembly is connected with a second-stage impeller suction chamber by virtue of the outer barrel; one end of a forward flushing pipe assembly is connected with an outlet of a first-stage impeller, the other end of the forward flushing pipe assembly is connected with a driving side mechanical seal assembly, one end of a backward flushing pipe assembly is connected with a suction chamber, and the other end of the backward flushing pipe assembly is connected with a non-driving side mechanical seal assembly. The multistage centrifugal high pressure liquefied hydrocarbon pump also comprises an automatic control reflux type thermal control mechanism. The multistage centrifugal high pressure liquefied hydrocarbon pump has the advantages that vaporization of pumping medium can be prevented, cooling and lubricating properties of a mechanical seal end face are improved, quantity of minimum continuous thermal limited flows can be reduced, energy consumption can be reduced, and safe and reliable operation of the pump is guaranteed.

Description

Multistage centrifugal high-pressure liquefaction hydrocarbon pump
Technical field
The present invention relates to a kind of pump valve field, be specifically related to a kind of multistage centrifugal high-pressure liquefaction hydrocarbon pump, including axial force balance mechanism, mechanical seal from flushing machine etc..
Background technology
Liquid hydrocarbon pump belongs to light hydrocarbon pump, and conveying is that vaporization inflammable and explosive, easy is volatile, the low ignition point of low-density, the danger medium of high saturated vapor pressure, and the change of temperature is extremely sensitive to its pressure for vaporization.The liquid ethylene of such as low-carbon (LC), butane and propylene etc..Liquid hydrocarbon pump, particularly high-pressure liquefaction hydrocarbon pump are the dynamic equipment of most critical in petro chemical industry and oil refining device flow process.
At present, low-flow high-lift liquid hydrocarbon pump typically selects vertical and high-speed pump (tangent pump) or reciprocating plunger pump, has also having of import domestic.Plunger displacement pump fluctuation of service, maintenance capacity is big;Vertical and high-speed pump is owing to being limited by performance, it is impossible to meet the powerful requirement of huge discharge, unless used multiple stage used in parallel, and such troublesome poeration;Common centrifugal multistage pump multiple centrifugal pump, easily vaporizes evacuation during operation, vibration is big.So to big flow, liquid hydrocarbon pump high-lift, powerful, the most domestic almost without optional proper product, import can only be relied on.Modern wide variety of Double-casing multi-stage centrifugal pump, although having high pressure resistant, the advantage such as static seal is reliable, easy to maintenance, sealing and aid system advanced technology, but still it is susceptible to vaporize vaccuum phenomenon when conveying high-pressure liquefaction hydrocarbon medium, there is the drawback of dangerous operation.
The main cause causing centrifugal multistage pump multiple centrifugal pump vaporization to evacuate is that insider is inadequate to the attention rate of its temperature rise hazardness in the past, lacks effective temperature rise control measure.The most do not emphasize that regulation minimum Continuous Heat limits the numerical value of flow, lacks the axial force balance protection pipeline of reasonable disposition, the protection mechanism of shortage reasonable disposition minimum Continuous Heat restriction flow.So-called minimum Continuous Heat limits flow, is that centrifugal pump is able to maintain that work and its operation will not be pumped the minimum discharge numerical value that the temperature rise of medium (liquid) is damaged.Specify that this value purpose is in order to avoid pump runs in less than the region of this value.Regulation minimum Continuous Heat limits flow rational regulation of this value for high-pressure liquefaction hydrocarbon pump and more seems necessary.The minimum Continuous Heat of pump limit flow except having with the characteristic of pump structure, pumped medium outside the Pass, also relevant with the characteristic of pump place device.It is not changeless that the minimum Continuous Heat of the most same pump limits flow, it is necessary to carries out corresponding calculating for concrete application conditions and determines.This value has taken greatly and has caused wasting the energy, having taken little and caused vaporization to evacuate.So conscientiously to discuss in project engineering stage, it is in operation and should give control (preferably automatically controlling) and ensure.The generation of mercury vapour is because what the temperature rise of first order impeller eye medium caused mostly, is that the wasted power overwhelming majority in pump transfers heat energy to and is pumped Absorption of Medium institute extremely.But for sectional type multi-stage pump, temperature rise the highest in pump is at balanced controls rear portion.Totally seeing, flow is the least, and the efficiency of pump is the lowest, and the temperature rise of pumped medium is the biggest, and the probability causing vaporization is the biggest.The former concern of view of the above is inadequate, and power is not given in measure.
The balance system of current domestic known multistage centrifugal (sectional type), the higher medium of temperature rise in its axial force balance mechanism balance chamber P returns to intake chamber X of pump, makes the temperature rise of first order impeller eye medium increase, easily produce vaporization;Additionally, its mechanical seal is all from the outlet K of first order impeller from the medium of flushing machine, then divide two by-pass lines by three way cock, and reduced pressure by restricting orifice, be connected respectively flushing liquor interface d, e of driving side and non-drive side mechanical sealing assembly end cap.Such flushing scheme, during if pump occurs vaporization, related affects the mechanical seal stability from flushing pressure, it is possible to cause a series of operation troubles such as mechanical seal damage and leakage.Along with the maximization of the projects such as liquid ethylene, in order to realize production domesticization, develop huge discharge specially, high-power, multistage centrifugal liquid hydrocarbon pump seems the most necessary.
Summary of the invention
It is an object of the invention to overcome above-mentioned deficiency, and provide a kind of and there is the axial force balance mechanism preventing pumped medium from vaporizing and the matched mechanical seal multistage centrifugal high-pressure liquefaction hydrocarbon pump from flushing machine.Also match using temperature rise as limiting the automatic control reverse-flow type thermal control mechanism design criteria of minimum thermal control operation flow, limit flow continuously automatically controlling minimum.
The purpose of the present invention realizes by following technical solution: multistage centrifugal high-pressure liquefaction hydrocarbon pump, including axial force balance mechanism, mechanical seal is from flushing machine, parts of bearings, rotating shaft, this axial force balance mechanism includes balancing liquid back pipe assembly, pump stage casing, impeller, balancing drum, suck letter body, pump cover, outer cylinder body, this mechanical seal includes forward flush pipe assembly from flushing machine, back flush pipe assembly, mechanical sealing parts, it has balance chamber, sencond stage impeller intake chamber, intake chamber, discharge chamber, Pump Suction Nozzle, pump discharge opening, the one-level stage casing in described pump stage casing is provided with hole for back flow, two grades of described pump stage casing between stage casing and outer cylinder body equipped with two grades of stage casing O-ring seals, at described suction letter body and outer cylinder body, equipped with sucking letter body O-ring seal between one-level stage casing;One end of described balance liquid back pipe assembly is connected with balance chamber by pump cover, its other end is connected with sencond stage impeller intake chamber by outer cylinder body;One end of described forward flush pipe assembly is connected with the outlet of the one stage impeller of impeller, its other end is connected with the driving side mechanical sealing assembly of mechanical sealing parts, and one end of described back flush pipe assembly is connected with intake chamber, its other end is connected with the non-drive side mechanical sealing assembly of mechanical sealing parts.
Described Pump Suction Nozzle, pump discharge opening are connected with automatic control reverse-flow type thermal control mechanism respectively, this automatic control reverse-flow type thermal control mechanism includes the automatic control reflux inlet being connected with pump discharge opening, this automatic control reflux inlet respectively with go out stream gate valve, backflow gate valve be connected, this backflow gate valve pass through fluid reservoir be connected with Pump Suction Nozzle.
Described axial force balance mechanism, is that the balance liquid exported returns sencond stage impeller porch, decreases the temperature rise of one stage impeller porch, reduces pumped medium vaporization and produces fault rate;Meanwhile, the mechanical seal adapted to it is set from flushing machine (pertaining only to from flushing part), use forward flushing scheme at driving side (low-pressure side) mechanical sealing assembly, use back flush scheme at non-drive side (high-pressure side) mechanical sealing assembly;The characteristic of the relevant device that structural shape, the characteristic of pumped medium and the centrifugal pump according to centrifugal pump is applied; calculate the temperature rise value of pumped medium, determine that minimum Continuous Heat limits flow value; limit the lift of flow value and correspondence according to minimum Continuous Heat and select automatic control reverse-flow type thermal control mechanism, thus realize minimum Continuous Heat and limit control and the protection of flow.Its acquirement provides the benefit that:
1, the axial force balance liquid of this centrifugal pump is owing to have employed the scheme being back to sencond stage impeller entrance, although be entrained into the medium that the temperature rise after balanced controls is big herein, but owing to operating pressure is higher than one stage impeller inlet pressure herein, and higher than the pressure for vaporization of medium at a temperature of this, therefore vaporization is less likely to occur;The medium risen due to balanced controls outlet higher temperatures is not carried to one stage impeller entrance, and the medium temperature rise ratio making this one stage impeller porch is relatively low, and pressure for vaporization also ratio is relatively low, and operating pressure herein is relatively low, therefore pump is also not easy to produce vaporization.The vibration that this avoid generation vaporization and cause, so cause damage and the disorderly closedown of pump, so that it is guaranteed that the safe and reliable operation of centrifugal pump.2, mechanical sealing parts is to ensure that the critical component of high-pressure liquefaction hydrocarbon pump safe operation.This centrifugal pump rinses (low-pressure side) and back flush (high-pressure side) mode owing to have employed the mechanical seal matched with described axial force balance mechanism from the forward of flushing machine, guarantee to have sufficiently stable from flushing pressure, improve the cooling of mechanical seal end surface, lubrication and the effect of anti-devaporation, improve mechanical seal operational reliability and service life.3, this centrifugal pump is owing to have employed said structure, can reduce minimum Continuous Heat and limit the quantity (being obtained by calculating) of flow, makes to be reduced to the flow of bypass by idle discharge, reduces the consumption of energy.This centrifugal pump is applicable to minimum Continuous Heat limits the automatic control reverse-flow type thermal control mechanism of flow owing to having matched, and plays and controls and the effect of protection, it is ensured that the safe and reliable operation of pump.
Accompanying drawing explanation
Detailed description further to the present invention with detailed description of the invention below in conjunction with the accompanying drawings.
Fig. 1 is the application structure schematic diagram of the present invention.
Fig. 2 is the balance liquid back pipe assembly of the present invention, forward flush pipe assembly, back flush pipe assembly and is applicable to the application flow schematic diagram that minimum Continuous Heat limits the automatic control reverse-flow type thermal control mechanism of flow.
Detailed description of the invention
nullAs shown in Figure 1,Multistage centrifugal high-pressure liquefaction hydrocarbon pump of the present invention,Including axial force balance mechanism、Mechanical seal is from flushing machine、Parts of bearings (includes left bearing assembly 191、Right bearing assembly 192)、Rotating shaft 20,This axial force balance mechanism includes balancing liquid back pipe assembly 3、Pump stage casing is (containing one-level stage casing 15、Two grades of stage casings 10)、Impeller is (containing one stage impeller 13、Sencond stage impeller 11)、Balancing drum 7 (and balancing drum set 8)、Suck letter body 14、Pump cover 9、Outer cylinder body 16,This mechanical seal includes forward flush pipe assembly 1 from flushing machine、Back flush pipe assembly 5、Mechanical sealing parts (includes driving side mechanical sealing assembly 61 and non-drive side mechanical sealing assembly 62),It has the balance chamber P (inner chamber by pump cover 9、The end face of balancing drum 7 and balancing drum set 8 is formed)、Sencond stage impeller intake chamber R、Intake chamber X、Discharge chamber T、Pump Suction Nozzle A、Pump discharge opening B and driving side seal chamber M1、Non-drive side seals (for known technology) such as chamber M2.
The one-level stage casing 15 in described pump stage casing is provided with hole for back flow 18, equipped with two grades of stage casing O-ring seals 4 (O type) between two grades of stage casings 10 and the outer cylinder body 16 in described pump stage casing, voltage stabilizing chamber Y and discharge chamber T (tool pump discharge pressure) is carried out isolation by it;Equipped with sucking letter body O-ring seal 12 (O type is three altogether) between described suction letter body 14 and outer cylinder body 16, one-level stage casing 10, voltage stabilizing chamber Y is carried out isolation with intake chamber X (tool pump inlet pressure) by it.Forming voltage stabilizing chamber Y between the inwall of described outer cylinder body 16, suction letter body 14 and the cylindrical in one-level stage casing 15, the cylindrical in two grades of stage casings 10 and two grades of stage casing O-ring seals 4, suction letter body O-ring seals 12, described hole for back flow 18 communicates with voltage stabilizing chamber Y, sencond stage impeller intake chamber R.
As shown in Figure 1 and Figure 2, one end of described balance liquid back pipe assembly 3 is connected with balance chamber P (outlet) by pump cover 9, its other end is connected (being i.e. provided with hole for back flow 18 on one-level stage casing 15) by outer cylinder body 16 with sencond stage impeller intake chamber R;Being provided with connected balance Pressure gauge 31, pressure transmitter 32, balanced thermometer 33 and temperature transmitter 34 in described balance liquid back pipe assembly 3, the pressure and temperature to balance return liquid system carries out on-the-spot display and teletransmission detection and controls respectively.Carry out sound and light alarm when balancing pressure and temperature higher than setting, it is to avoid owing to the operation of balanced controls is abnormal, and cause temperature rise downstream to steeply rise the rear pressure for vaporization pressure medium P more than sencond stage impeller intake chamberR, ultimately result in the vaporization of pumped medium.
One end of described forward flush pipe assembly 1 is connected with the outlet K of the one stage impeller 13 of impeller, its other end (i.e. its outlet d) is connected with the driving side mechanical sealing assembly 61 of mechanical sealing parts;Described forward flush pipe assembly 1 is provided with connected forward and rinses regulation valve 111, restricting orifice 112 and forward flushing pressure table 113.Forward rinses regulation valve 111 and uses during the debugging determining restricting orifice 112 size.By the regulation of restricting orifice 112, make operating pressure P of sencond stage impeller intake chamber PRDrop to PM1+ 0.2MPa, this value is indicated by forward flushing pressure table 113.
One end (i.e. its outlet f) of described back flush pipe assembly 5 is connected with intake chamber X, (i.e. its import e's its other end) is connected with the non-drive side mechanical sealing assembly 62 of mechanical sealing parts;Being provided with connected lower regulation valve 51, upper regulation valve 52, cooler 53 and back flush Pressure gauge 54, lower thermometer 55 and upper thermometer 56 in described back flush pipe assembly 5, this cooler 53 is between lower regulation valve 51, lower thermometer 55 and upper regulation valve 52, upper thermometer 56.Carry out the higher a small amount of medium of the follow-up temperature rise of self-balancing mechanism after the cooling of subcooler so that it is temperature returns to intake chamber after reducing.Lower thermometer 55 be cooling before medium temperature, upper thermometer 56 be cooling after medium temperature.Cooler is provided with flange cooling water intake h, flange cooling water water return outlet g, and back flush Pressure gauge then shows the pressure medium P of balance chamber Pp
Wherein, balance liquid back pipe assembly 3 has import a and outlet b (adpting flange) of balance liquid medium;Forward flush pipe assembly 1 has from the import c of scouring media and outlet d (adpting flange);Back flush pipe assembly 5 has from the import e of scouring media and outlet f (adpting flange).Described each import, outlet a, b, c, d, e, f represent the interface adpting flange of above-mentioned all kinds of pipe assembly.Balance liquid back pipe assembly 3 connects balance chamber P (high-pressure side) and sencond stage impeller intake chamber R (low-pressure end), and it makes balance liquid be flowed to voltage stabilizing chamber Y and sencond stage impeller intake chamber R by balance chamber P, reaches the purpose of balancing axial thrust.Voltage stabilizing chamber Y is the pressure chamber that thus pump one-level lift produces, and it communicates with sencond stage impeller intake chamber R.By the two grades of stage casing O-ring seals 4 (O type) being arranged between two grades of stage casings 10 and outer cylinder body 16, voltage stabilizing chamber Y is carried out isolation with discharge chamber T (having pump discharge pressure);By being arranged on the suction letter body O-ring seal 12 (O type is three altogether) sucked on letter body 14, voltage stabilizing chamber Y is carried out isolation with intake chamber X (having pump inlet pressure).
If the temperature of intake chamber X that pumped medium enters pump is set to t1DEG C, the temperature rise produced due to power attenuation is set to Δ t1DEG C, owing to the temperature rise produced in balance chamber P is set to Δ t2DEG C, then the temperature of intake chamber X is (t1+Δt1) DEG C, the temperature of balance chamber R is (t1+Δt1+Δt2)℃.For high-pressure pump, Δ t2> > Δ t1.So while the value added of pressure for vaporization that temperature rise causes, sencond stage impeller intake chamber R more than intake chamber X.Calculate and fact proved: owing to the operating pressure of sencond stage impeller intake chamber R is higher than the operating pressure of intake chamber X, although the pressure for vaporization that temperature rise causes increases, but it is still above (t1+Δt1+Δt2) DEG C at a temperature of the pressure for vaporization of medium, so vaporization phenomenon will not be produced.
The rotating shaft sealing mode of this high-pressure liquefaction hydrocarbon pump selects Double End (having pressure) mechanical seal.In order to cool down and the rotating ring (revolving part) in lubricating mechanical sealing parts and stationary ring (static element) end face, need it is rinsed.This flushing pressure typically seals chamber M1, high more than the 0.2MPa of pressure of non-drive side sealing chamber M2 than driving side.
As it is shown in figure 1, the driving side now setting this pump seals pressure medium in chamber M1 as PM1, the pressure medium that non-drive side seals in chamber M2 is PM2, the pressure medium in intake chamber X is Px, and the pressure medium in balance chamber P is Pp, the pressure medium in sencond stage impeller intake chamber R is PR.Due to PM1< PR, it is achieved that the forward of driving side mechanical sealing assembly 61 rinses (scouring media enters driving side by forward flush pipe assembly 1 the most from outside to inside and seals chamber M1);Further, since Px < PM2< Pp, it is achieved that the back flush (scouring media leaves non-drive side the most from inside to outside and seals chamber M2, enters back into intake chamber X by back flush pipe assembly 5) of non-drive side mechanical sealing assembly 62.And equipped with heat exchanger 53 in back flush pipe assembly 5, after a small amount of medium that in self-balancing chamber P, temperature is higher in the future cools down, enter back into intake chamber X.In forward flush pipe assembly 1, owing to temperature rise is smaller, so there is no need to install again heat exchanger.
As shown in Figure 2, the minimum Continuous Heat that is applicable to preventing mercury vapour of multistage centrifugal high-pressure liquefaction hydrocarbon pump Selecting Complete Set of the present invention limits automatic control reverse-flow type thermal control mechanism 17 (alternatively referred to as self-loopa protection mechanism) of flow, described Pump Suction Nozzle A, pump discharge opening B is connected with automatic control reverse-flow type thermal control mechanism 17 respectively, this automatic control reverse-flow type thermal control mechanism 17 includes the automatic control reflux inlet 171 being connected with pump discharge opening B, this automatic control reflux inlet 171 (passing through pipeline) respectively with go out stream gate valve 172, backflow gate valve 173 is connected, this backflow gate valve 173 is connected with Pump Suction Nozzle A by fluid reservoir 174.Automatic control reflux inlet 171 is that integrated check valve, flow transducer, bypass control valve (BCV), multilevel decompression function are integrated;Using static seal, No leakage, completely without electrical connection essential safe type.Pumped medium enters by Pump Suction Nozzle A, by the rotation of rotating shaft 20 and the conveying of multi-stage impeller, spued by pump discharge opening B, when this rate-of flow limits flow less than or equal to the minimum Continuous Heat of regulation, described automatic control reflux inlet 171 is opened, open outflow by pipeline by going out stream gate valve 172, or opened by backflow gate valve 173 as required and pass through fluid reservoir 174 re-enter to Pump Suction Nozzle A.It not only acts as the major function of the protection anti-devaporation of pump, and can ensure that in dangerous situation safe handling.
The present invention the reaction feed pump of the methyl ethyl ketone plant of Taizhou chemical enterprise, Shandong chemical enterprise alkene project dehydrogenation unit hydrogenation feed pump on applied, the medium of conveying is the light hydrocarbon media such as butane, butylene, propane.Present invention is mainly applied to petrochemical industry and coal chemical industry conveying high-pressure light hydrocarbon medium it can also be used to steam power plant's conveying high-pressure boiler feedwater.

Claims (6)

1. multistage centrifugal high-pressure liquefaction hydrocarbon pump, including axial force balance mechanism, mechanical seal from washer Structure, parts of bearings, rotating shaft (20), this axial force balance mechanism include balance liquid back pipe assembly (3), Pump stage casing, impeller, balancing drum (7), suction letter body (14), pump cover (9), outer cylinder body (16), This mechanical seal from flushing machine include forward flush pipe assembly (1), back flush pipe assembly (5), Mechanical sealing parts, it has balance chamber (P), sencond stage impeller intake chamber (R), intake chamber (X), discharge chamber (T), Pump Suction Nozzle (A), pump discharge opening (B), it is characterised in that: The one-level stage casing (15) in described pump stage casing is provided with hole for back flow (18), in two grades of described pump stage casing Equipped with two grades of stage casing O-ring seals (4) between section (10) and outer cylinder body (16), at described suction letter body (14) equipped with sucking letter body O-ring seal (12) and between outer cylinder body (16), one-level stage casing (10); One end of described balance liquid back pipe assembly (3) is connected with balance chamber (P) by pump cover (9), it is another One end is connected with sencond stage impeller intake chamber (R) by outer cylinder body (16);Described forward flush pipe assembly (1) one end is connected with the outlet of the one stage impeller (13) of impeller, its other end and mechanical sealing parts Driving side mechanical sealing assembly (61) be connected, one end of described back flush pipe assembly (5) and suction Chamber is connected, its other end is connected with the non-drive side mechanical sealing assembly (62) of mechanical sealing parts.
Multistage centrifugal high-pressure liquefaction hydrocarbon pump the most according to claim 1, it is characterised in that: described The inwall of outer cylinder body (16), suction letter body (14) and the cylindrical of one-level stage casing (15), two grades of stage casings (10) shape between cylindrical and two grades of stage casing O-ring seals (4), suctions letter body O-ring seal (12) Become voltage stabilizing chamber (Y), described hole for back flow (18) and voltage stabilizing chamber (Y), sencond stage impeller intake chamber (R) communicate.
Multistage centrifugal high-pressure liquefaction hydrocarbon pump the most according to claim 1, it is characterised in that: described Balance liquid back pipe assembly (3) is provided with connected balance Pressure gauge (31), pressure transmitter (32), Balanced thermometer (33) and temperature transmitter (34).
Multistage centrifugal high-pressure liquefaction hydrocarbon pump the most according to claim 1, it is characterised in that: described Forward flush pipe assembly (1) is provided with connected forward and rinses regulation valve (111), restricting orifice (112) With forward flushing pressure table (113).
Multistage centrifugal high-pressure liquefaction hydrocarbon pump the most according to claim 1, it is characterised in that: described Back flush pipe assembly (5) is provided with connected lower regulation valve (51), upper regulation valve (52), cooling Device (53) and back flush Pressure gauge (54), lower thermometer (55) and upper thermometer (56), should Cooler (53) be in lower regulation valve (51), lower thermometer (55) and upper regulation valve (52), on Between thermometer (56).
6. according to the multistage centrifugal high-pressure liquefaction hydrocarbon pump described in claim 1,2,3,4 or 5, its Be characterised by: described Pump Suction Nozzle (A), pump discharge opening (B) respectively with automatic control reverse-flow type thermal control mechanism (17) being connected, this automatic control reverse-flow type thermal control mechanism (17) includes the automatic control being connected with pump discharge opening (B) Reflux inlet (171), this automatic control reflux inlet (171) respectively with go out stream gate valve (172), backflow gate valve (173) Being connected, this backflow gate valve (173) is connected with Pump Suction Nozzle (A) by fluid reservoir (174).
CN201610378791.0A 2016-05-25 2016-05-25 Multistage centrifugal high-pressure liquefaction hydrocarbon pumps Active CN105864093B (en)

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Citations (5)

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Publication number Priority date Publication date Assignee Title
WO2011078680A1 (en) * 2009-12-23 2011-06-30 William Paul Hancock Turbo-machine thrust balancer
GB2493737A (en) * 2011-08-17 2013-02-20 William Paul Hancock Turbo-machine automatic thrust balancing
CN103133352A (en) * 2011-11-22 2013-06-05 上海连成(集团)有限公司 Novel structure of self-suction horizontal-type multi-stage pump
CN203670298U (en) * 2013-12-31 2014-06-25 江苏大学 Device for washing mechanical seal and cooling bearing of trash pump
CN205654588U (en) * 2016-05-25 2016-10-19 浙江科尔泵业股份有限公司 Multistage centrifugal high pressure liquefaction hydrocarbon pump

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