CN1186944A - Integral deaerator for heat pipe steam condenser - Google Patents

Abstract

An integral deaerator for a condenser has a main steam duct connected to a condenser duct by a riser. The condenser duct is inclined slightly downwards toward the riser and a weir is positioned at the connection between the riser and the condenser duct to prevent condensate from draining directly into the riser. The condenser duct has a drain for draining a condensate from within the condenser duct to a distribution header for distributing the condensate within the riser. Steam is provided to the main steam duct for condensation in the condenser and while in transit, the steam heats and deaerates the condensate. At least one drain boot is connected to the bottom of the main steam duct for draining deaerated condensate.

Description

The integral deaerator that is used for heat pipe steam condenser

The present invention relates to be used to produce the outgas technique field of the boiler feedwater of steam, particularly an integral deaerator that is used for heat pipe steam condenser.

Deaerator is the part of power plant Rankine (Rankine) thermodynamic steam circulating condensing water storage systems.Usually deaerator is arranged on the downstream of condenser equipment, and as usual, they are the stand-alone assemblies that are connected with storage system with power plant steam condensation.

Deaerator is used for the degasification of boiler feedwater, so can reduce the corrosion of equipment.Deaerator also can be used to the backheat heating is carried out in feedwater, thereby improves the efficiency of cycle of power plant.

The general condenser that moves under vacuum pressure is the phase I of degasification, and there, uncondensable gas is separated from condensed steam, and continues to be eliminated away from system.Yet the supercooling of any degree of liquid in condenser all can cause some gases no longer to be dissolved in liquid.The deaerator design is used for removing as much as possible these undissolved gases.Remove by a boiler water chemistry treatment system by the undissolved gas of still staying in the liquid after the deaerator processing.

Move deaerator by overcooled condensed water is heated near saturation point, Gas Solubility reaches zero in the liquid there.After heating or add and pine for,, thereby remove gas by pallet or injector agitated liquid mechanically.For mechanical agitation effectively, the area of vapor/liquid contact surface must be enough big so that the device that a supplied gas is overflowed is set.

The most important benefit of deaerator is to have eliminated traditional condenser, the overcooled cold water that takes place in air-cooling vacuum condenser particularly, overcooled condensed water is inevitably, and this is because there is a steam pressure drop in the thousands of tiny pipe that is used for an air-cooling condenser condensation.This differential pressure has reduced the saturation temperature and the pressure of condensed water.Thereby the condensate temperature difference is lower than initial vapo(u)rous temperature.

Can be in U.S. Patent No. 5,203, find the example of deaerator in 286, it has illustrated that one has the condenser of two column jeckets in the middle of steam inlet and feedwater cabinet.Arrange that two column jeckets make the steam and water generates one reverse flow of passing, so that degasification.Deaerator is a system independently, and not as the present invention, and provides the tubular of steam to be integral to the vacuum condenser.

U.S. Patent No. 5,405,435 disclose a kind of deaerator equipment that utilizes gravity to help circulation in the system.The top of water access arrangement gas washing part, and enter by it and to have the bottom that is monitored water level, and steam passes the bottom and arrives top, discharges from system.Deaerator does not need a transfer pump to realize the degasification of water, and is not combined into integral body with jet chimney.

Because different operating pressures, traditional condenser system needs a deaerator/condensation water tank that separates with heat-exchange apparatus.Traditional design has an overhead main steam line, thousands of catch tanks, following displacement can and water arm envelope, and this causes some differential pressures, and requires main steam line and condensed water are isolated.With pipeline condensed water is sent to one independently jar and to carry out degasification in the deaerator be employed one simple method in these design.But, this method with according to the present invention deaerator is combined into integral body with the condenser system jet chimney and compares, cost is bigger.

No matter an object of the present invention is to provide an integral deaerator of economy all aspect cost or space utilization that is used for heat pipe steam condenser.

Therefore, provide a deaerator that is combined into one with heat pipe steam condenser, it reduces at least 3% with the cost of whole condenser system, and does not need an independent condensation water tank.

Deaerator of the present invention is an integral deaerator that uses with heat pipe steam condenser.Along the length of main steam line, use several integral deaerators that many heat pipe jet chimneys are connected on the main steam line.

Each integral deaerator all has a vertical tube, and it vertically extends and end in the vertical tube cover from main steam line.One heat pipe steam condenser jet chimney is basically along extending perpendicular to the longitudinal axis of main steam line and the vertical axis direction of vertical tube.The heat pipe steam condenser jet chimney has a water trap near heat pipe steam condenser jet chimney vertical tube wall.The bottom of heat pipe steam condenser jet chimney has been blocked on one weir, and making it can not be directly and the vertical tube internal communication.

Steam condensate (SC) must pass through the discharge outlet of each condenser jet chimney and arrive complete in vertical tube a, dispensing branch between main steam line and heat pipe steam condenser jet chimney.Condensed steam is sprayed by playpipe, playpipe in dispensing branch above a selectable condenser pallet that is positioned at above the main steam line.The water trap that leads to feed pump is arranged on the bottom of main steam line.

The different novel characteristics that the present invention had will be specifically noted in the claim of a part appended, that openly illustrate as this patent.In order to understand the present invention better, understand its operation advantage and to use the specific purposes that it reaches, will be in conjunction with reference to the accompanying drawings preferred embodiment of the present invention being described.

Fig. 1 is the sectional view of deaerator of the present invention;

Fig. 2 is the vertical view cutaway drawing that dissects along Fig. 1 center line 2-2.

Consult accompanying drawing now, wherein identical label is used for illustrating same or analogous parts, integral deaerator of the present invention in Fig. 1, total is expressed as 10, will export the main steam line 40 that (not shown) extends out from steam turbine and be connected with one or more heat pipe steam condenser pipeline 30.In the lower end of main steam line 40, a water trap 20 has a passage that leads to boiler feed pump 25.

Main steam line 40 is with respect to each the root vertical orientation in one or more heat pipe steam condenser pipeline 30, and downward-sloping slightly towards water trap 20.

The type of each heat pipe steam condenser pipeline 30 is such, its collect condensed water of self-contained many heat pipe (not shown) lower end in heat pipe steam condenser pipeline 30 other parts.Heat pipe steam condenser pipeline 30 is downward-sloping slightly towards integral deaerator 10.

Integral deaerator 10 has a cylindrical vertical tube 60, and an end of vertical tube is connected with main steam line 40 upsides, and the other end is by 65 sealings of vertical tube cover.One weir 50 is positioned at the junction between heat pipe steam condenser pipeline 30 and vertical tube 60 sides.Adjacent weir 50, in heat pipe steam condenser pipeline 30, drainpipe 70 is connected in the bottom of pipeline 30.

By vertical tube 60, drainpipe 70 is attached to dispensing branch 80.Arm 80 flatly is positioned at vertical tube 60, and is higher than main steam line 40 but is lower than weir 50.Many have the distributing pipe 90 of exhaust port 110 perpendicular to arm 80 horizontal-extendings.One pallet 120 can be between arm 80, pipe 90 and main steam line 40.Pallet 120 provides additional surfaces long-pending, so that the steam that makes progress by pallet 120 that flows main steam line 40 in closely contacts with the condensed fluid 100 that provides thereon, thereby advantageously constitutes v-shaped structure or comprises packing material or composition (spheroid etc.).

Be in operation, vacuum and steam flows to main steam line 40 from power plant's steam turbine (not shown), upwards flows through vertical tube 60 then.The condensed fluid 100 that is collected in the heat pipe steam condenser pipeline 30 is arranged to vertical tube 60 and weir 50.Junction in 30 in vertical tube 60 and heat pipe steam condenser pipeline prevents that by weir 50 condensed fluid 100 from entering vertical tube 60.Replace, liquid must flow to dispensing branch 80 and distributing pipe 90 by drainpipe 70, by exhaust openings 110, is injected on the pallet 120 there.

As mentioned above, downward liquid flow is opposite with the vacuum and steam that upwards flows at a high speed.Select the area of steam vertical tube 60 and the speed of vacuum and steam, so that the turbulent mixture of steam and liquid flow to be provided, but prevent that a large amount of liquid 100 from upwards being carried or flood pallet 120.Turbulent mixture makes liquid vapour begin to become drop from exhaust openings 110.This heating and degasification for drop all provides a big liquid/vapor area.The gas of removing from liquid is rushed in heat pipe steam condenser pipeline 30, arrive the air removal system (not shown) of condenser again.

One or more pallets 20 can be arranged on the below of dispensing branch 80 and pipe 90, to strengthen the heating and the degasification of liquid 100.Pallet 120 can be reverse flow, dish type-and-annular, the pallet of cross flow one or the pallet of other known types, or be used for the design of inserts (spheroid, material etc.) of degasification.In addition, liquid 100 can spray, and only is sent to pallet 120 but can replace, and is used for heating effectively and degasification.

Then, the condensed water of degasification is arranged into main steam line 40, flows to water trap 20 and feedsupply pump 25 again.Main steam line 40 has replaced the independent condensation water tank that uses in the traditional condenser effectively.Therefore, main steam line 40 is biased in the below of any steam turbine, to prevent that condensation flow from going into the steam turbine (not shown), in addition, the high and low condensed water level monitor of known any kind can be included in the level that is used for monitoring the liquid 100 there in the jet chimney 40.

In a large power plant, can use 10, one deaerators 10 of several heat pipe steam condenser pipelines 30 and deaerator that a heat pipe steam condenser pipeline 30 is connected with main steam line 40.In this case, can any suitable position in main steam line 40 on, single water trap 20 is set.

Advantage of the present invention comprises the passivity of its operation, need not moving component, therefore can reduce cost and maintenance cost.In addition, weir 50 and drainpipe 70 produces a hydrostatic head, and it can overcome the pressure loss that is subjected at every distributing pipe 90 and exhaust openings 110 places.

Can select exhaust openings 110 is made progress or lateral orientation, so that liquid 100 produces a cross flow one, this depends on operation conditions and desired degasification structure in vertical tube 60.Exhaust openings 110 can be the plain bore that bores in distributing pipe 90, or is fixed on the conventional spout on the distributing pipe 90.If the space allows, variable earthing is arranged on drainpipe 70 in the vertical tube 60.

Though by at length illustrating and describe a specific embodiment of the present invention the application of the principles of the present invention has been described, has been appreciated that the present invention also may be embodied in other examples that do not exceed this principle.

Claims (12)

1. an integral deaerator that is used for heat pipe steam condenser comprises:

One substantially portrait orientation, have the main steam line of top and bottom;

One substantially portrait orientation, have the heat pipe steam condenser pipeline of end opening vertical tube one by one;

One connects the vertical tube of main steam line and heat pipe steam condenser pipeline, and vertical tube is connected at its opening part and the top of main steam line;

One weir is positioned at the opening part of vertical tube;

Tapping equipment is used for a condensed water is discharged in the heat pipe steam condenser pipeline; And,

The distributor that is connected with tapping equipment is used for distributing the condensed water in the vertical tube.

2. an integral deaerator as claimed in claim 1 also comprises at least one water trap that is connected with main steam line, is used for discharging condensed water.

3. an integral deaerator as claimed in claim 2 also comprises being used for providing to main steam line the steam unit of steam.

4. an integral deaerator as claimed in claim 1 is characterized in that, distributor comprises a dispensing head that is connected with described tapping equipment and an a plurality of distributing pipe, and every distributing pipe all has the opening that a plurality of and described dispensing head is connected.

5. an integral deaerator as claimed in claim 4 is characterized in that, a plurality of openings all are directed downwards.

6. an integral deaerator as claimed in claim 4 is characterized in that, a plurality of openings all are upwards directed.

7. an integral deaerator as claimed in claim 6 is characterized in that a plurality of openings also comprise nozzle.

8. an integral deaerator as claimed in claim 4 is characterized in that, distributor also comprise be arranged in vertical tube, the reverse flow below distributing pipe, dish type-and-annular or cross flow one pallet one.

9. an integral deaerator as claimed in claim 3 also comprises being positioned at vertical tube, the adverse current below distributor, disk-and-in annulation or the cross flow one pallet one.

10. an integral deaerator as claimed in claim 3 also comprises a kind of pallet apparatus that contains in the material of filling composition or being used to provide the additional surface area, in order to promote tight contact the between steam and condensed water.

11. an integral deaerator as claimed in claim 1 is characterized in that tapping equipment and weir all are arranged in the vertical tube.

12. an integral deaerator as claimed in claim 3 is characterized in that the heat pipe steam condenser pipeline is downward-sloping slightly towards vertical tube.

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