CN105864093B - Multistage centrifugal high-pressure liquefaction hydrocarbon pumps - Google Patents

Multistage centrifugal high-pressure liquefaction hydrocarbon pumps Download PDF

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Publication number
CN105864093B
CN105864093B CN201610378791.0A CN201610378791A CN105864093B CN 105864093 B CN105864093 B CN 105864093B CN 201610378791 A CN201610378791 A CN 201610378791A CN 105864093 B CN105864093 B CN 105864093B
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China
Prior art keywords
pump
stage casing
level
pressure
chamber
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CN201610378791.0A
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CN105864093A (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

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/041—Axial thrust balancing
    • F04D29/0413—Axial thrust balancing hydrostatic; hydrodynamic thrust bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/06—Multi-stage pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
    • F04D15/0022—Control, 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0077—Safety measures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/086—Sealings especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/708—Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type

Abstract

A kind of multistage centrifugal high-pressure liquefaction hydrocarbon pump, including axial force balance mechanism, mechanical seal from flushing machine, shaft, hole for back flow is equipped on its level-one stage casing, equipped with two level stage casing sealing rubber ring between its two level stage casing and outer barrel, equipped with sucking letter body sealing rubber ring between sucking letter body and outer barrel, level-one stage casing；One end of balance liquid back pipe component is connected by pump cover with balance chamber, its other end is connected by outer barrel with sencond stage impeller intake chamber；One end that forward direction rinses tube assembly is connected with the outlet of one stage impeller, its other end is connected with driving side mechanical sealing assembly, and one end of back flush tube assembly is connected with intake chamber, its other end is connected with non-drive side mechanical sealing assembly.Further include automatic control reverse-flow type thermal control mechanism.The present invention can prevent pumped medium from vaporizing, and improve cooling, the lubrication of mechanical seal end surface, can reduce the quantity of minimum Continuous Heat limitation flow, reduce energy expenditure, it is ensured that pump safe and reliable operation.

Description

Multistage centrifugal high-pressure liquefaction hydrocarbon pumps
Technical field
The present invention relates to a kind of pump valve fields, a kind of multistage centrifugal high-pressure liquefaction hydrocarbon pump are specifically related to, including axial direction Dynamic balance mechanism, mechanical seal are from flushing machine etc..
Background technology
Liquid hydrocarbon pump belong to light hydrocarbon pump, conveying be it is inflammable and explosive, easily vaporize volatile, the low ignition point of low-density, height The danger medium of saturated vapor pressure, and the variation of temperature is extremely sensitive to its pressure for vaporization.Such as liquid ethylene, the fourth of low-carbon Alkane and propylene etc..Liquid hydrocarbon pump, particularly high-pressure liquefaction hydrocarbon pump is most close in petro chemical industry and oil refining device flow The dynamic equipment of key.
At present, low-flow high-lift liquid hydrocarbon pump generally selects vertical and high-speed pump (tangent pump) or reciprocating plunger pump, has Also having for import is domestic.Plunger pump fluctuation of service, maintenance capacity are big；Vertical and high-speed is pumped due to being limited by performance, it is impossible to be met The powerful requirement of huge discharge, unless it is used in parallel using more, it is troublesome in poeration in this way；Common centrifugal multistage pump multiple centrifugal pump, during operation Easily vaporization evacuates, and vibration is big.So to big flow, high lift, powerful liquid hydrocarbon pump, the country is almost without optional at present Proper product, import can only be relied on.Modern widely applied Double-casing multi-stage centrifugal pump, although with high pressure resistant, static seal Reliably, easy to maintenance, the advantages that sealing and auxiliary system are technologically advanced, but still hold when conveying high-pressure liquefies hydrocarbon medium Vaporization vaccuum phenomenon easily occurs, there are the drawbacks of dangerous operation.
The main reason for centrifugal multistage pump multiple centrifugal pump vaporization is caused to evacuate is the attention rate that insider in the past rose its temperature harmfulness Not enough, lack effective temperature and rise control measure.Such as it does not emphasize the numerical value of regulation minimum Continuous Heat limitation flow, lack rationally The axial force balance protection pipeline of configuration, the protection mechanism for lacking reasonable disposition minimum Continuous Heat limitation flow.So-called minimum Continuous Heat limits flow, is that the temperature that centrifugal pump is able to maintain that work and its operation will not be pumped medium (liquid) rises and damaged Minimum discharge numerical value.The purpose of providing this value is in order to avoid pump is run in the region less than the value.The minimum Continuous Heat limit of regulation Flow processed rational regulation of this value for high-pressure liquefaction hydrocarbon pump more seems necessary.Pump minimum Continuous Heat limitation flow in addition to The characteristic of structure, pumped medium with pump has outside the Pass, also related with the characteristic of device where pump.Therefore same the minimum of pump connects Continuous heat limitation flow is not changeless, it is necessary to carry out corresponding calculate for concrete application conditions and determine.This value, which has taken greatly, to be led It causes waste of energy, taken small to cause vaporization to evacuate.So conscientiously to be discussed in project engineering stage, control should give in operation (preferably automatically controlling) and ensure.Caused by the generation of mercury vapour is mostly the Wen Sheng because of first order impeller eye medium, It is that the wasted power overwhelming majority in pump switchs to thermal energy and is pumped Absorption of Medium institute extremely.But for sectional type multi-stage pump, Highest Wen Sheng is at balance mechanism rear portion in pump.It totally sees, flow is smaller, and the efficiency of pump is lower, and the Wen Sheng of pumped medium is got over Greatly, the possibility for leading to vaporization is bigger.View of the above is inadequate in former concern, and power is not given in measure.
The balance system of multistage centrifugal (sectional type) well known to the country at present, axial force balance mechanism balance chamber P In Wen Sheng higher medium back to pump intake chamber X, make first order impeller eye medium temperature rise increase, easily generate Vaporization；In addition, its mechanical seal is all from the outlet K of first order impeller from the medium of flushing machine, then pass through three-way connection It is divided to two by-pass lines, and is depressurized by restricting orifice, is connected respectively driving side and non-drive side mechanical sealing assembly end Flushing liquid interface d, e of lid.Such flushing scheme, if pump when vaporizing, related influence mechanical seal is from flushing pressure Stability, it is possible to cause mechanical seal damage and leakage etc. a series of operation troubles.It is big with projects such as liquid ethylenes Type in order to realize production domesticization, specially develops huge discharge, high-power, multistage centrifugal liquid hydrocarbon pump seems very necessary.
Invention content
It is an object of the present invention to overcome the above mentioned deficiencies, and provide a kind of axial force for having and preventing pumped medium from vaporizing Balance mechanism and matched mechanical seal are pumped from the multistage centrifugal high-pressure liquefaction hydrocarbon of flushing machine.It also matches with Wen Shengzuo The automatic control reverse-flow type thermal control mechanism design criteria of flow is operated for limitation minimum thermal control, to automatically control minimum continuous limitation stream Amount.
The purpose of the present invention is realized by following technical solution：Multistage centrifugal high-pressure liquefaction hydrocarbon pumps, including axial force Balance mechanism, mechanical seal from flushing machine, parts of bearings, shaft, the axial force balance mechanism include balance liquid back pipe component, Stage casing, impeller, balancing drum, sucking letter body, pump cover, outer barrel are pumped, which includes positive flush pipe group from flushing machine Part, back flush tube assembly, mechanical sealing parts, with balance chamber, sencond stage impeller intake chamber, intake chamber, discharge Chamber, Pump Suction Nozzle, pump discharge opening are equipped with hole for back flow on the level-one stage casing in the pump stage casing, the two level in the pump stage casing Equipped with two level stage casing sealing rubber ring between stage casing and outer barrel, it is equipped between stage casing in the sucking letter body and outer barrel, level-one Suck letter body sealing rubber ring；One end of the balance liquid back pipe component is connected by pump cover with balance chamber, its other end passes through Outer barrel is connected with sencond stage impeller intake chamber；Described positive flushing one end of tube assembly and the outlet phase of the one stage impeller of impeller Even, its other end be connected with the driving side mechanical sealing assembly of mechanical sealing parts, one end of the back flush tube assembly with Intake chamber is connected, its other end is connected with the non-drive side mechanical sealing assembly of mechanical sealing parts.
The Pump Suction Nozzle, pump discharge opening are connected respectively with automatic control reverse-flow type thermal control mechanism, the automatic control reverse-flow type thermal control machine Structure include with the automatic control return valve that is connected of pump discharge opening, the automatic control return valve respectively with going out stream gate valve, reflux gate valve is connected, this time Stream gate valve is connected by fluid reservoir with Pump Suction Nozzle.
The axial force balance mechanism is that the equilibrium liquid exported is returned to sencond stage impeller inlet, reduces level-one leaf The Wen Sheng of inlet is taken turns, pumped medium vaporization is reduced and generates failure rate；At the same time, the mechanical seal that setting is adapted to it is certainly Flushing machine (is pertained only to from flushing section), in driving side (low-pressure side) mechanical sealing assembly using positive flushing scheme, non- Driving side (high-pressure side) mechanical sealing assembly uses back flush scheme；According to the structural shape of centrifugal pump, the spy of pumped medium Property and the characteristic of related device applied of centrifugal pump, calculate the temperature rise value of pumped medium, determine minimum Continuous Heat limitation flow Value limits flow value according to minimum Continuous Heat and corresponding lift selects automatic control reverse-flow type thermal control mechanism, so as to fulfill minimum even The control and protection of continuous heat limitation flow.Its obtain advantageous effect be：
1st, the axial force balance liquid of this centrifugal pump is as a result of the scheme for flowing back into sencond stage impeller entrance, although here The medium of the Wen Sheng great after balance mechanism has been entrained into it, but since operating pressure herein is higher than one stage impeller inlet pressure, and high Pressure for vaporization of medium at a temperature of this, therefore be less likely to occur to vaporize；Since the medium that balance mechanism outlet higher temperatures rise does not have One stage impeller entrance is carried to, the medium temperature rise ratio for making this one stage impeller inlet is relatively low, and pressure for vaporization is also than relatively low, and herein Operating pressure it is relatively low, therefore pump do not allow to be also easy to produce vaporization yet.This avoid vibrate or even cause caused by vaporizing The damage of pump and disorderly closedown, so that it is guaranteed that the safe and reliable operation of centrifugal pump.2nd, mechanical sealing parts are to ensure high-pressure liquefaction Hydrocarbon pumps the critical component of safe operation.This centrifugal pump is as a result of the mechanical seal to match with the axial force balance mechanism Positive from flushing machine rinses (low-pressure side) and back flush (high-pressure side) mode, it is ensured that has sufficiently stable from flushing pressure Power improves the effect of the cooling of mechanical seal end surface, lubrication and anti-devaporation, improves mechanical seal operational reliability and makes Use the service life.3rd, this centrifugal pump can reduce the quantity of minimum Continuous Heat limitation flow and (pass through calculating due to the above structure, Obtain), the flow by idle discharge to bypass is reduced, reduces the consumption of energy.This centrifugal pump is suitable for due to having matched The automatic control reverse-flow type thermal control mechanism of minimum Continuous Heat limitation flow, plays the role of control and protection, it is ensured that pump it is safe and reliable Operation.
Description of the drawings
Below in conjunction with the accompanying drawings with specific embodiment to further detailed description of the invention.
Fig. 1 is the application structure schematic diagram of the present invention.
Fig. 2 is the balance liquid back pipe component of the present invention, positive rinses tube assembly, back flush tube assembly and suitable for most The application flow schematic diagram of the automatic control reverse-flow type thermal control mechanism of small Continuous Heat limitation flow.
Specific embodiment
As shown in Figure 1, multistage centrifugal high-pressure liquefaction hydrocarbon pump of the present invention, including axial force balance mechanism, mechanical seal certainly Flushing machine, parts of bearings (including left axle bearing assembly 191, right axle bearing assembly 192), shaft 20, the axial force balance mechanism packet Balance liquid back pipe component 3, pump stage casing (stage casing containing level-one 15, two level stage casing 10), impeller are included (containing one stage impeller 13, sencond stage impeller 11), balancing drum 7 (and balancing drum set 8), sucking letter body 14, pump cover 9, outer barrel 16, the mechanical seal include just from flushing machine To flushing tube assembly 1, back flush tube assembly 5, mechanical sealing parts (including driving side mechanical sealing assembly 61 and non-drive side Mechanical sealing assembly 62), with balance chamber P (by the inner cavity of pump cover 9, balancing drum 7 and balancing drum set 8 end face formed), Sencond stage impeller intake chamber R, intake chamber X, discharge chamber T, Pump Suction Nozzle A, pump discharge opening B and driving side sealed chamber (for known technology) such as M1, non-drive side sealed chamber M2.
Hole for back flow 18 is equipped on the level-one stage casing 15 in the pump stage casing, in the two level stage casing 10 in the pump stage casing and outer barrel Equipped with two level stage casing sealing rubber ring 4 (O-shaped) between body 16, voltage stabilizing chamber Y and discharge chamber T (tool pump discharge pressure) are carried out Isolation；Between the sucking letter body 14 and outer barrel 16, level-one stage casing 10 equipped with sucking letter body sealing rubber ring 12 (it is O-shaped, be altogether Three), voltage stabilizing chamber Y is carried out and is isolated with intake chamber X (tool pump inlet pressure).The inner wall of the outer barrel 16, sucking The outer circle in letter body 14 and level-one stage casing 15, the outer circle in two level stage casing 10 and two level stage casing sealing rubber ring 4, sucking letter body fluid sealant Voltage stabilizing chamber Y is formed between circle 12, the hole for back flow 18 is communicated with voltage stabilizing chamber Y, sencond stage impeller intake chamber R.
As shown in Figure 1 and Figure 2, one end of the balance liquid back pipe component 3 passes through pump cover 9 and balance chamber P (outlet) phase Even, its other end is connected with sencond stage impeller intake chamber R by outer barrel 16 and (hole for back flow 18 is equipped with i.e. on level-one stage casing 15)； Connected balance pressure gauge 31, pressure transmitter 32, balanced thermometer 33 and temperature are equipped in the balance liquid back pipe component 3 to become Device 34 is sent, live display is carried out to the pressure and temperature for balancing return liquid system respectively and teletransmission detects and controls.When balance pressure Sound-light alarm is carried out when being higher than specified value with temperature, is avoided since the operation of balance mechanism is abnormal, and leads to temperature downstream It rises and steeply rises the pressure medium P that rear pressure for vaporization is more than sencond stage impeller intake chamberR, eventually lead to the vaporization of pumped medium.
Described positive one end for rinsing tube 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；It is equipped with and is connected in the positive flushing tube assembly 1 Positive rinse regulating valve 111, restricting orifice 112 and positive flushing pressure table 113.Forward direction rinses regulating valve 111 for determining It is used in the debugging process of 112 size of restricting orifice.By the adjusting of restricting orifice 112, make the work of sencond stage impeller intake chamber P Make pressure PRDrop to PM1+ 0.2MPa, this value are indicated by positive flushing pressure table 113.
One end (i.e. it exports f) of the back flush tube assembly 5 is connected, its other end (i.e. its import with intake chamber X E) it is connected with the non-drive side mechanical sealing assembly 62 of mechanical sealing parts；It is equipped with what is be connected in the back flush tube assembly 5 Lower regulating valve 51, upper regulating valve 52, cooler 53 and back flush pressure gauge 54, lower thermometer 55 and upper thermometer 56, this is cold But device 53 is between lower regulating valve 51, lower thermometer 55 and upper regulating valve 52, upper thermometer 56.It is subsequent to carry out self-balancing mechanism A small amount of medium of Wen Sheng higher returns to intake chamber after the cooling of subcooler after reducing its temperature.Lower thermometer 55 is Medium temperature before cooling, upper thermometer 56 are medium temperatures after cooling.Cooler be equipped with flange cooling water intake h, Flange cooling water water return outlet g, back flush pressure gauge then show the pressure medium P of balance chamber Pp。
Wherein, balance liquid back pipe component 3 has the import a of balance liquid medium and outlet b (connecting flange)；Positive flush pipe Component 1 has from the import c of scouring media and outlet d (connecting flange)；Back flush tube assembly 5 have from scouring media into Mouth e and outlet f (connecting flange).Each import, outlet a, b, c, d, e, f represent the interface connection method of above-mentioned all kinds of tube assemblies It is blue.It balances liquid back pipe component 3 and connects balance chamber P (high-pressure side) and sencond stage impeller intake chamber R (low-pressure end), make equilibrium liquid Voltage stabilizing chamber Y and sencond stage impeller intake chamber R are flowed to by balance chamber P, achieve the purpose that balancing axial thrust.Voltage stabilizing chamber Y is Thus the pressure chamber that pump level-one lift generates, communicates with sencond stage impeller intake chamber R.By be mounted on two level stage casing 10 with it is outer Two level stage casing sealing rubber ring 4 (O-shaped) between cylinder 16 carries out voltage stabilizing chamber Y and discharge chamber T (having pump discharge pressure) Isolation；By the sucking letter body sealing rubber ring 12 (O-shaped, to be altogether three) being mounted on sucking letter body 14, by voltage stabilizing chamber Y with inhaling Enter chamber X (there is pump inlet pressure) and carry out isolation.
If the temperature that pumped medium enters the intake chamber X of pump is set as t1DEG C, the Wen Shengshe generated due to power attenuation For Δ t1DEG C, since the Wen Sheng generated in balance chamber P is set as Δ t2DEG C, then the temperature of intake chamber X is (t1+Δt1) DEG C, it puts down The temperature of weighing apparatus chamber R is (t1+Δt1+Δt2)℃.For high-pressure pump, Δ t2＞ ＞ Δs t1.So while caused by Wen Sheng The value added of pressure for vaporization, sencond stage impeller intake chamber R's is more than intake chamber X.Calculate and facts proved that：Due to sencond stage impeller The operating pressure of intake chamber R is higher than the operating pressure of intake chamber X, although pressure for vaporization caused by Wen Sheng increases, it is still So it is higher than (t1+Δt1+Δt2) DEG C at a temperature of medium pressure for vaporization, so vaporization phenomenon will not be generated.
The rotating shaft sealing mode of high-pressure liquefaction hydrocarbon pump selects Double End (having pressure) mechanical seal.In order to cool down and lubricating machine Rotating ring (revolving part) and stationary ring (static element) end face in tool seal member, need to be rinsed it.The flushing pressure is general Pressure than driving side sealed chamber M1, non-drive side sealed chamber M2 is high more than 0.2MPa.
As shown in Figure 1, pressure medium in the driving side sealed chamber M1 of the pump is now set as PM1, non-drive side sealed chamber Pressure medium in M2 is PM2, the pressure medium in intake chamber X is Px, and the pressure medium in balance chamber P is Pp, two level leaf It is P to take turns the pressure medium in intake chamber RR.Due to PM1＜ PR, realize the positive of driving side mechanical sealing assembly 61 and rinse (scouring media then rinses tube assembly 1 by forward direction from outside to inside and enters driving side sealed chamber M1)；In addition, due to Px ＜ PM2＜ Pp, realize non-drive side mechanical sealing assembly 62 back flush (scouring media then leave from inside to outside non-drive side sealing Chamber M2 enters back into intake chamber X by back flush tube assembly 5).And heat exchanger 53 is housed in back flush tube assembly 5, it will After a small amount of medium higher from temperature in balance chamber P is cooled down, intake chamber X is entered back into.Forward direction rinses tube assembly 1 In, since temperature rise ratio is smaller, so It is not necessary to installing heat exchanger again.
As shown in Fig. 2, multistage centrifugal high-pressure liquefaction hydrocarbon pump Selecting Complete Set of the present invention prevents being suitable for most for mercury vapour The automatic control reverse-flow type thermal control mechanism 17 (alternatively referred to as self-loopa protection mechanism) of small Continuous Heat limitation flow, the Pump Suction Nozzle A, Pump discharge opening B is connected respectively with automatic control reverse-flow type thermal control mechanism 17, which is included with pumping discharge opening B Connected automatic control return valve 171, the automatic control return valve 171 (passing through pipeline) is respectively with going out stream gate valve 172, reflux 173 phase of gate valve Even, which is connected by fluid reservoir 174 with Pump Suction Nozzle A.Automatic control return valve 171 is integrated check valve, flow biography Sensor, bypass control valve (BCV), multilevel decompression function are integrated；Using static seal, No leakage, completely without electrical connection essential safety Type.Pumped medium is entered by Pump Suction Nozzle A, spued by the conveying of the rotation of shaft 20 and multi-stage impeller, by pump discharge opening B, When the rate-of flow is less than or equal to defined minimum Continuous Heat limitation flow, the automatic control return valve 171 is opened, and passes through pipeline It is opened outflow by going out stream gate valve 172 or is opened as needed by reflux gate valve 173 and pass through 174 re-enter of fluid reservoir To Pump Suction Nozzle A.It not only acts as protection and pumps the major function of anti-devaporation, and can ensure that and used safely in dangerous situation.
The present invention is in the reaction feed of the methyl ethyl ketone plant of Taizhou chemical enterprise pump, Shandong chemical enterprise alkene item Adding for mesh dehydrogenation unit is applied on hydrogen feed pump, and the medium of conveying is the light hydrocarbons medium such as butane, butylene, propane.This hair It is bright to be mainly used in 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 flushing machine, parts of bearings, Shaft (20), the axial force balance mechanism include balance liquid back pipe component (3), pump stage casing, impeller, balancing drum (7), sucking letter body (14), pump cover (9), outer barrel (16), the mechanical seal include positive flushing tube assembly (1), back flush pipe from flushing machine Component (5), mechanical sealing parts, with balance chamber (P), sencond stage impeller intake chamber (R), intake chamber (X), discharge chamber Room (T), Pump Suction Nozzle (A), pump discharge opening (B), it is characterised in that：Liquid is equipped with back on the level-one stage casing (15) in the pump stage casing Hole (18), equipped with two level stage casing sealing rubber ring (4) between the pump two level stage casing (10) in stage casing and outer barrel (16), in institute It states between sucking letter body (14) and outer barrel (16), level-one stage casing (10) equipped with sucking letter body sealing rubber ring (12)；The balance One end of liquid back pipe component (3) is connected by pump cover (9) with balance chamber (P), its other end passes through outer barrel (16) and two level Impeller intake chamber (R) is connected；One end of the positive flushing tube assembly (1) and the outlet phase of the one stage impeller (13) of impeller Even, its other end is connected with the driving side mechanical sealing assembly (61) of mechanical sealing parts, the back flush tube assembly (5) One end is connected with intake chamber, its other end is connected with the non-drive side mechanical sealing assembly (62) of mechanical sealing parts.
2. multistage centrifugal high-pressure liquefaction hydrocarbon pump according to claim 1, it is characterised in that：The outer barrel (16) it is interior Outer circle, the outer circle of two level stage casing (10) and the two level stage casing sealing rubber ring of wall, sucking letter body (14) and level-one stage casing (15) (4), voltage stabilizing chamber (Y), the hole for back flow (18) and voltage stabilizing chamber (Y), two level are formed between sucking letter body sealing rubber ring (12) Impeller intake chamber (R) communicates.
3. multistage centrifugal high-pressure liquefaction hydrocarbon pump according to claim 1, it is characterised in that：The balance liquid back pipe component (3) connected balance pressure gauge (31), pressure transmitter (32), balanced thermometer (33) and temperature transmitter (34) are equipped in.
4. multistage centrifugal high-pressure liquefaction hydrocarbon pump according to claim 1, it is characterised in that：The positive flushing tube assembly (1) the positive flushing regulating valve (111) being connected, restricting orifice (112) and positive flushing pressure table (113) are equipped in.
5. multistage centrifugal high-pressure liquefaction hydrocarbon pump according to claim 1, it is characterised in that：The back flush tube assembly (5) connected lower regulating valve (51), upper regulating valve (52), cooler (53) and back flush pressure gauge (54), lower temperature are equipped in Degree meter (55) and upper thermometer (56), the cooler (53) is in lower regulating valve (51), lower thermometer (55) and upper regulating valve (52), between upper thermometer (56).
6. the multistage centrifugal high-pressure liquefaction hydrocarbon pump according to claim 1,2,3,4 or 5, it is characterised in that：The pumping Entrance (A), pump discharge opening (B) are connected respectively with automatic control reverse-flow type thermal control mechanism (17), the automatic control reverse-flow type thermal control mechanism (17) Including with pump discharge opening (B) the automatic control return valve (171) that is connected, the automatic control return valve (171) respectively with go out stream gate valve (172), The gate valve (173) that flows back is connected, which is connected by fluid reservoir (174) with Pump Suction Nozzle (A).
CN201610378791.0A 2016-05-25 2016-05-25 Multistage centrifugal high-pressure liquefaction hydrocarbon pumps Active CN105864093B (en)

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CN107676274B (en) * 2017-11-08 2024-03-26 江苏国泉泵业制造有限公司 Hot air circulation system for vertical high-temperature heavy metal pump
CN107882766B (en) * 2017-11-08 2024-01-12 江苏国泉泵业制造有限公司 Hot air circulation system of guide bearing of high-temperature pump
CN112594191A (en) * 2020-12-29 2021-04-02 亿志机械设备(无锡)有限公司 Small-flow high-lift multistage centrifugal pump

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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
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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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Denomination of invention: Multi stage centrifugal high-pressure liquefied hydrocarbon pump

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