CN2034988U

CN2034988U - High-efficiency and low-consumption multi-channel water-gas jet pump unit

Info

Publication number: CN2034988U
Application number: CN 88211096
Authority: CN
Inventors: 田鹤年; 张炽威
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-02-13
Filing date: 1988-02-13
Publication date: 1989-03-29

Abstract

The utility model discloses a water-gas jet pump unit which is used for pumping a condenser in a power generating plant and the gas is not condensed. According to the characteristics of the two-phase flow, the utility model make a series of improvement for the structure of the multi-channel long throat type water-gas jet pump unit which is generated in soviet union in seventies and which is generalized in China at the first stage of eighties. The pumping power of the utility model can be improved 69.7% compared with the prior art. The vacuum of the condenser is effectively improved. The heat consumption of the steam turbine unit is reduced 0.2-0.4 %, and the wasted work of the jet pump is reduced. The purpose with low consumption and high efficiency is achieved. The device designs one postposition type jet pump-leaving velocity jet pump with a plurality of channels below the main jet pump. The energy of the leaving velocity can be rationally utilized still. Because the lost work is reduced, the vibration and the noise are reduced.

Description

High-efficiency and low-consumption multi-channel water-gas jet pump unit

It is power that the utility model relates to the employing press water, as the aspirator of incondensable gas in equipment, container, the pipe-line system, belongs to the jet pump class, is mainly used in equipment such as thermal power plant vapour condenser, gland heater.

Adopt prior art water---gas jet pump group as shown in Figure 1, it is formed by component-assembled such as intake chamber 1, water spray 2, suction chamber 3, check valve 4, trunnion 5, leaving velocity jet pump 6 and discharge tubes 7, it is still newer pattern both at home and abroad at present, is the extensively employing (transformation " power station " 1974(2 of the Soviet Union's г и Е ф wuoikuH Leningrad K-300-240 of metal factory type steam turbine water jet air ejector) of thermal power plant institute; The structure of long throat type water jet air ejector and calculating " Т e л л о э HepreTuka " 1982(2); The Shanghai steam turbine plant, Tianshenggang Power Plant's 12.5 ten thousand kilowatts of machine assembly air-exhausting device remodeling TECHNICAL SUMMARY 1981; Tian Henian, the development of water jet air ejector and present situation, " North China electric power " 1986(7) etc.).Above-mentioned jet pump is analyzed from the angle of two phase flow theory, its shortcoming is more, mainly be: partly at suction chamber, gas fails successfully to be pressed into trunnion, but some is struck against beyond the aditus laryngis, there is tangible gas phase bias current in suction chamber, the design type of leaving velocity jet pump fails to take into full account the energy interchange principle of two phase flow, the leaving velocity energy major part that penetrates from trunnion is consumed among the bump loss to conical converging, these have all influenced the raising of efficient, the general 2.2 degree electricity/kg of air per kg of water evaporated that are higher than of the ratio wasted work of main injection pump are difficult to adapt to the needs that current large-scale thermal power machine group develops.

The purpose of this utility model has provided a kind of compact structure, circulation rationalization, has made it more to meet low-consumption high-efficiency multichannel water--the gas jet pump group of two phase flow work characteristics.Its internal losses is few, under the situation that energy consumption reduces, has increased substantially the air aspiration, improves condenser vacuum, and this will make the steam turbine doing work, reach considerable energy-saving benefit, and help the safe operation of unit.This device can more reasonably utilize leaving velocity, obviously reduces internal losses, and has reduced vibration and noise.

Technical solution of the present utility model:

The utility model is according to " the energy interchange principle of water---gas two phase flow " development, and seven passage long throat type water---the gas jet pump structurally has tangible difference with both at home and abroad year new development is got up surplus in the of nearly ten for it.For the ease of understanding, here do a simple explanation: water---the effect of gas jet pump is based on two mechanism: 1, suction chamber mechanism: the water bundle produces a viscous force to surrounding atmosphere, this power makes water bundle and the generation of adjacent gas two-phase particle interlayer laterally ooze mixed, gas is promptly forced to take part forward by the water bundle like this, air is pressed into trunnion when future is without hindrance, makes suction chamber produce vacuum.Hence one can see that, and the structure of suction chamber must accomplish under the less water yield, and water bundle and air surface of contact are enough big, each strand water bundle is air-breathing evenly and air can be pressed into trunnion to greatest extent.In order to realize this point, the aperture group that the structure that the utility model has taked to have in the suction chamber diffluence room is arranged by a constant pitch as main passage and several is as secondary channels, to reduce vapour lock, to eliminate the gas phase bias current; Adopt straight line contraction aditus laryngis contraction section below suction chamber, its single face tilt angle is 7 °～8 °, preventing that gas from being hindered beyond aditus laryngis, and reduces cavitation erosion, vibration and noise; 34 to 36 times are decided nozzle---the larynx long value is determined the best multiple with nozzle inside diameter---, and this makes water Shu Changdu reach preferred values; In view of so center-aisle forces to take part the ability of air more little relatively can be according to the needs of aspiration, the vexed center-aisle of seven passages that goes are set up a kind of six channel-styles with further realization low-consumption high-efficiency.2, larynx inner compressor reason: the efficient of the two phase flow abundant compression in trunnion can raising jet pump.Larynx is long after deliberation---and the Pressure characteristics line can be divided into four sections, that is: aditus laryngis supercharging section, pressure stability section, quickening supercharging section, the supercharging section of easing up.When hanging down hydraulic pressure, accelerating the supercharging section can more early occur, and efficient is also high, but the vacuum instability; High hydraulic pressure is accelerated the supercharging section down and is come late, need sizable larynx length could realize high efficiency, but wasted work is also big.Formerly in view of the above ought to determine suitable hydraulic pressure characteristic line earlier, and got a larynx internal pressure point on this line, and make its needs that satisfy the leaving velocity jet pump, be that best larynx is long therewith accordingly.The utility model is according to the principle that still has flow velocity mutual noninterference between high flow velocities and several trunnions in the end of uniform section trunnion, the tail end pumping tube has been installed, it is to open 12 millimeters apertures of φ 10～φ in the nearly outlet port of 1～2 trunnion, takes over that the road is used for aspirating the leaving velocity jet pump inefficient low tolerance of institute but pipe hinders big suction object.

In order to maximally utilise trunnion outlet leaving velocity, based on above-mentioned principle, leaving velocity jet pump provided by the utility model also is a multi-channel type, its port number is consistent with the main injection pump channel, the trunnion outlet end of main injection pump is the main jet of leaving velocity jet pump, the section ratio of leaving velocity jet pump trunnion and leaving velocity jet pump main jet is 2.1～2.2, and leaving velocity jet pump larynx length is 1.8～2.2 with the ratio of internal diameter.

The utility model advantage:

Water provided by the utility model---gas jet pump group is compared with seven passage long throat type jet pumps of prior art, when suction chamber pressure is all 0.045ata, aspiration by 21.5 kilograms/time bring up to 36.5 kilograms/time, increase by 69.7%.For the best back pressure that guarantees vapour condenser provides condition, in the ordinary course of things, be example with N125 type steam turbine, can economize on coal every year 500 tons, and save water pump power consumption 86400 degree.If under the low situation of condenser vacuum tightness, Turbo-generator Set will be more can avoid sending out little less and increase the considerable loss of electric power.Main injection pump 1.6 wasted works drop to 1.05 degree electricity/kilogram gas by 2.3 degree electricity/kilogram gas of prior art, and the leaving velocity jet pump improves vacuum 50 millimeter of mercury than prior art.Because the loss of the bump of two phase flow reduces, noise will reduce 5 decibels.Its structural principle also can be extended and is used for the water of other industrial use---gas spraying device.

Fig. 1 is seven channel water of prior art---gas jet pump group schematic representation.

Fig. 2 is the utility model seven channel water---gas jet pump group schematic representation.

Fig. 3 is the utility model six channel water---gas jet pump group schematic representation.

Below in conjunction with accompanying drawing the utility model is further described:

The water that the utility model provides--gas jet pump group has two kinds of embodiments.

First kind of embodiment is seven channel-styles as shown in Figure 2.For assembling by intake chamber (1), water spray (2), suction chamber (3), check valve (4), trunnion (5), leaving velocity jet pump (6), discharge tube (7), aditus laryngis contraction section (8), diffluence room (9), trunnion tail end pumping tube (10) and leaving velocity jet pump trunnion (11) etc.Described suction chamber import is a check valve, and air is shunted naturally through check valve, enters suction chamber through the main passage of strap clamp layer by the both sides window, and every window section is amassed and equated with the import caliber.On the suction chamber inwall of nearly check valve one side, bore 12 of the apertures of φ 6-8 millimeter, be arranged in two layers, be arranged in squares, 70 millimeters of pitch-rows, this is a secondary channels.The section ratio of trunnion and water spray is about 4.5, is used for the jet pump of N125 type steam turbine set, and the water spray bore adopts 32 millimeters of φ, and the aditus laryngis section is 7.5 ° straight line type contraction pipeline section for the single face tilt angle.Trunnion is φ 76 * 4 steel pipes, and larynx length is 35 with the ratio of larynx internal diameter, and larynx is long to adopt 2.4 meters.Water spray, aditus laryngis contraction section and trunnion material adopt the 1Cr18Ni9Ti stainless steel, and remaining housing parts is all used A ₃Steel plate is welded.

Leaving velocity jet pump of the present utility model is installed on main injection pump trunnion below, and trunnion is stretched out 120 millimeters from leaving velocity jet pump upper cover plate, and this is the nozzle of leaving velocity jet pump, and under the every nozzle, centering is installed φ 108 * 4 stainless steel trunnions, long 200 millimeters of larynx.The blue short tube of band method that suction chamber housing one STH welding φ is 108 * 4 millimeters is in order to the trapped gas of suction gland heater vapour side and vapour condenser water side.Trunnion tail end pumping tube 10 is in one to two trunnion of main injection pump, 12 to φ 14 millimeters holes of tube wall brill φ apart from 300 millimeters places of exhaust port, take over road and main injection pump trunnion and be the crossing welding in 30 ° of angles, though it is few in order to suction tolerance, but the suction object that the pipe resistance is big, as cold wind device hydroecium, prior art institute is inefficient often for this.

Second embodiment of the present utility model is six channel-types as shown in Figure 3.It is assembled by intake chamber 1, water spray 2, suction chamber 3, check valve 4, trunnion 5, leaving velocity jet pump 6, discharge tube 7, aditus laryngis contraction section 8, diffluence room 9, trunnion tail end pumping tube 10 and leaving velocity jet pump trunnion 11 etc.Its structure and first embodiment are basic identical, only are in product processing, change water spray in the middle of the main injection pump into vexed plate, and the suction chamber trunnion of main injection pump and leaving velocity jet pump inlet all added vexed plate, fix with screw and tube sheet, the sealing surface shimming is to guarantee sealing.

Therefore this example is used for the slightly smaller suction object of air capacity with it because center-aisle and surrounding air contact-making surface seldom, so vexed this pipe water consumption of going falls 1/7th in fact, but aspirate the reduction less than 1/10th of air capacity, has more the merit of low-consumption high-efficiency.

Claims

1, low-consumption high-efficiency multichannel water-gas jet pump group of forming of a kind of main injection pump that constitutes by intake chamber, water spray, suction chamber, check valve, trunnion and leaving velocity jet pump, discharge tube, it is characterized in that the aditus laryngis contraction section is arranged at the suction chamber bottom, diffluence room is arranged in the suction chamber, trunnion has the tail end pumping tube, and the leaving velocity jet pump of trunnion below has several passages.

2, low-consumption high-efficiency multichannel water according to claim 1--gas jet pump group is characterized in that the aditus laryngis contraction section is a straight line type, and the single face tilt angle is 7 °-8 °, and length of throat is 34-36 with the ratio of internal diameter.

3, low-consumption high-efficiency multichannel water according to claim 1--gas jet pump group is characterized in that having on diffluence room's internal layer shell monosymmetric air sprue and several auxilliary runners of arranging by a constant pitch of aperture group conduct.

4, low-consumption high-efficiency multichannel water according to claim 1--gas jet pump group is characterized in that the tail end pumping tube opens 14 millimeters apertures of φ 12～φ and take over the road in the nearly outlet port of trunnion.

5, low-consumption high-efficiency multichannel water according to claim 1--gas jet pump group, it is characterized in that leaving velocity jet pump passage number is consistent with the trunnion port number on top, main injection pump trunnion outlet end is the main jet of leaving velocity jet pump, the section ratio of leaving velocity jet pump trunnion and leaving velocity jet pump main jet is 2.1～2.2, and leaving velocity jet pump larynx length is 1.8～2.2 with the ratio of internal diameter.