CN106556177A

CN106556177A - Based on seawater as cooling water thermal power plant's heat recovery method

Info

Publication number: CN106556177A
Application number: CN201710004995.2A
Authority: CN
Inventors: 王玲
Original assignee: State Grid Liaoning Electric Power Co Ltd
Current assignee: State Grid Liaoning Electric Power Co Ltd; Benxi Power Supply Co of Liaoning Electric Power Co Ltd
Priority date: 2017-01-04
Filing date: 2017-01-04
Publication date: 2017-04-05
Anticipated expiration: 2037-01-04
Also published as: CN106556177B

Abstract

Based on seawater as cooling water thermal power plant's heat recovery method, belong to power plant field, to reduce thermal power plant's heat waste, and reduce the thermal pollution of thermal power plant, allow to be dispersed in the used heat of the user using power plant of seawater discharge channel, and in heat transfer process, heat exchange efficiency is high, consumptive material loss is low, and technical essential is：S1. outdoor channel is excavated along thermal power plant to sea, including seawater introduces channel and seawater discharge channel；S2. in the seawater discharge channel selector distributing canal section install it is following based on seawater as cooling water thermal power plant's heat recovery system, and channel introducing is introduced as the seawater of cooling water by seawater, itself and turbine condenser are exchanged heat with the steam that liquefies, the heat exchange is to exchange heat for the first time, and the seawater after first time is exchanged heat is drained to seawater discharge channel.

Description

Based on seawater as cooling water thermal power plant's heat recovery method

Technical field

The invention belongs to power plant field, be related to it is a kind of based on seawater as cooling water thermal power plant's heat recovery method.

Background technology

Thermal power plant is needed using cooling water with cooling steam, and general power plant cooling water comes from cooling tower, and the electricity in coastal waters Factory can be introduced directly into seawater and steam be cooled down to reach the purpose gathered materials on the spot as cooling water.Seawater completes steam condensation meeting When improving self heat, such as Dalian winter, the temperature for completing the seawater for condensing can reach 18 degree or so, and general power plant can be by this Part seawater is back in the sea, however, this mode can cause seawater thermal pollution, has also wasted the heat of power plant.

Typically can all there be house or the factory building for having demand to this partial heat the vicinity of discharge water, if can be by this part Heat is used, and has both avoided thermal pollution, it is also possible to improve using energy source.

However, have certain distance between the outdoor channel of thermal power plant and sea, to the house or factory building of heat demand also compared with Near dispersion discharge water, it is therefore desirable in seawater flow process so that different user can obtain heat nearby.

And during seawater discharge is entered sea, the impurity or the impurity entered in discharge process in seawater, such as mud Sand, algae, fallen leaves, rubbish etc., can all have a strong impact on heat exchange, and heat exchange consumptive material is lost.

The content of the invention

In order to solve the above problems, the invention provides it is a kind of based on seawater as cooling water heat recovery side of thermal power plant Method, with to reducing thermal power plant's heat waste, and the thermal pollution of reduction thermal power plant so that the user for being dispersed in seawater discharge channel can With the used heat using power plant, and in heat transfer process, heat exchange efficiency is high, and consumptive material loss is low.

To achieve these goals, the present invention provides following technical scheme：It is a kind of based on seawater as cooling water thermoelectricity Factory's heat recovery method, comprises the steps：

S1. outdoor channel is excavated along thermal power plant to sea, including seawater introduces channel and seawater discharge channel；

S2. in the seawater discharge channel selector distributing canal section install it is following based on seawater as cooling water thermal power plant Heat recovery system, and channel introducing is introduced as the seawater of cooling water by seawater, which is exchanged heat with turbine condenser With the steam that liquefies, the heat exchange is to exchange heat for the first time, and the seawater after first time is exchanged heat is drained to seawater discharge channel；

The intermediary's water flowed in S3.PE intermediaries water return duct is carried out with the seawater after the first time heat exchange into closed irrigation canals and ditches Exchange heat for second, improve the temperature of intermediary's water, intermediary's water of the intensification is again by source pump and heat demand device shape Into recuperated cycle；

In second heat transfer process, the extra large evaporation of water vapour after exchanging heat for the first time is condensed in the inclination of closed irrigation canals and ditches Upper lid, and guiding gutter is entered with collection and purification water along condensate drainage channel, corrosion-resistant net circulation transmission is filtered, and by outer net Perching knife is scalped in transmission process and is bonded in corrosion-resistant online impurity, and the impurity arranged in ditch is periodically struck off by scraper plate；

Thermal power plant's heat recovery system based on seawater as cooling water includes closed irrigation canals and ditches, and which has tilt flat plate Cover in type, the outer surface laying heat-insulation layer of the upper lid, along the incline direction of the upper lid, opens up some condensates thereon Drainage channel, each drainage channel converge in the guiding gutter on the inclination base for being placed in the upper lid, the closed irrigation canals and ditches Hermatic door is installed at both ends, and the guiding gutter is stretched out by hermatic door, and water inlet is arranged on the hermatic door of side, and has filtration Net, the angle of inclination covered in the tilt flat plate type are 5～10 degree；

The horizontal lower cover of the irrigation canals and ditches lays a ZuUXing PE intermediaries water return duct, between each PE intermediaries water return duct of the group Uniformly arrange in Semi surrounding type, and it is closely knit in gap filling sand, and each PE intermediaries water return duct is provided with circulating pump, and and intermediary Water storage tank is connected, and pacifies cartridge control valve on connecting pipe；

Exchange heat with the turbine condenser of thermal power plant as the seawater of cooling water, the seawater after heat exchange is by side hermatic door Water inlet is entered, in the closed irrigation canals and ditches with PE intermediaries water return ducts in intermediary's water heat exchange；In PE intermediaries water return duct Upper strata covers one layer of water-permeable brick, and the water-permeable brick inclines laying, and is digging out row positioned at the vicinity of the water-permeable brick for inclining lowest point Ditch, makes to connect with row's ditch positioned at the water-permeable brick for inclining lowest point；The upper lid is consistent with the laying incline direction of water-permeable brick, described The angle of inclination of water-permeable brick is 7～12 degree；

Corrosion-resistant net is laid on the upper strata of water-permeable brick, and the corrosion-resistant net is single layer of wires net, and twine is in transverse and longitudinal square crossing It is uniform to arrange；Drive roll and driven voller are arranged on the bracing frame of left and right sides hermatic door, the first driving chain respectively with it is described The front end of drive roll is connected with the front end of the driven voller, the second driving chain respectively with the rear end of the drive roll and it is described from The rear end of dynamic roller is connected, so that the drive roll is linked with the driven voller, the corrosion-resistant net is covered in the first driving chain Or second on driving chain；One or two in the bracing frame of the both sides sealed door is provided with outer net perching knife；

Equipped with scraper plate, Pai Gouzhong is equipped with the track advanced for scraper plate to row's ditch；

First water pipe at the non-U-shaped end of the PE intermediaries water return duct, the second water pipe are stretched out by the side hermatic door, should The first described water pipe connects the water side of source pump evaporimeter, described the second water pipe connection source pump evaporimeter Water intake end, the water side of the condenser of the source pump connect the 3rd water pipe, and the water intake end of condenser connects the 4th water pipe.

Beneficial effect：The invention enables the factory building of power plant seawater discharge channel both sides, house are dispersed in, can be to generating electricity The used heat of factory is reclaimed, and is reduced the thermal pollution in power plant, also, is improved heat exchange efficiency, when extending the use of consumptive material Between, the condensation water recovery and use that will be also produced by steam, to form the integral type process of heat exchange, purification.

Description of the drawings

Fig. 1 is the structural representation of system of the present invention；

Fig. 2 is another kind of structural representation of system of the present invention；

Fig. 3 is corrosion-resistant net drive mechanism schematic diagram；

Fig. 4 is the structured flowchart of the system；

Fig. 5 is the schematic diagram of method described in embodiment.

1. cover on, 2. guiding gutter, 3.PE intermediaries water return duct, 4. water-permeable brick, 5. corrosion-resistant net, 6. drive roll, 7. driven Roller, 8. the first driving chain, 9. corrosion-resistant net, 10. motor, 11. corrosion-resistant nets, 12. second driving chains.

Specific embodiment

Present embodiment provides a kind of embodiment, so that the present invention is further described.

In one embodiment, as Dalian use in winter based on seawater as cooling water thermal power plant heat recovery system System, including closed irrigation canals and ditches, which has lid 1 in tilt flat plate type, the outer surface laying heat-insulation layer of the upper lid 1, along on described The incline direction of lid 1, opens up some condensate drainage channels thereon, and each drainage channel is converged in and is placed in the upper lid The guiding gutter 2 on 1 inclination base, the both ends of the closed irrigation canals and ditches install hermatic door, and the guiding gutter 2 is stretched out by hermatic door. In heat transfer process, have a large amount of vapor and condensate be condensed in upper lid 1, be typically considered a kind of callable clean water, It is that this part water is recycled, upper lid 1 is set to into lid 1 in plate inclination, and opens up some condensate drainage canals Road, will condense in the condensate of upper lid 1 by Action of Gravity Field drainage, and converge in the guiding gutter 2 on the inclination base of lid 1, with So that this partial coagulation water is collected.And lay heat-insulation layer, be in order to ensure that low temperature season does not freeze, such as winter when, upper lid 1 is warm Spend it is low, may cause condense water freezing problem occur.The angle of inclination covered in the tilt flat plate type is 5～10 degree, excellent Elect 8 degree as, as the upper purpose being obliquely installed of covering is that, in order to collect condensate, if angle of inclination is too small, condensate is difficult Flowing, it is impossible to reach guiding gutter so that condensate cannot be collected by drainage；And wide-angle is crossed, condensation water flow velocity is difficult to again Control, produces overflow phenomena, and excessive angle, also wastes substantial amounts of insulation layer material, and the angular range is through a large amount of Angle change the preferred range that experiment finds, condensate flow velocity under the scope is ideal, can be adapted to gathering speed, and Overflow phenomena will not occur, under the angle, the use for being incubated layer material is not result in that obvious cost increases.In the embodiment In, the evaporation and condensation water of seawater to be reclaimed, is a kind of very effective means for obtaining clean water, this recovery occurs In heat transfer process, the water yield of recovery is further promoted, and such as, the flow of processed seawater is 10000 ton hours, according to The evaporation capacity of a ten thousandth, evaporation capacity hourly can reach 1 ton, and the clean water energy collected for a day reaches 24 tons or so, receive The water yield of collection is considerable.

In the system, the water inlet of the seawater after inflow heat exchange for the first time is arranged on the hermatic door of side, and has filtration Net, to filter out the thing of the more big parts such as rubbish that the seawater after for the first time heat exchange is fallen into during discharge flow.It is described The one ZuUXing PE intermediaries water return duct 3 of horizontal lower cover laying of irrigation canals and ditches, is in Semi surrounding type between each PE intermediaries water return duct 3 of the group Uniform to arrange and closely knit in gap filling sand, each PE intermediaries water return duct 3 is provided with circulating pump, and with intermediary's water storage tank Connection, and pacify cartridge control valve on connecting pipe；The intermediary's water circulated in U-shaped PE intermediaries water return duct 3, storage tank Water can use the water in storage tank to supplement the intermediary's water in PE intermediaries water return duct 3 directly from running water, when needed.

Exchange heat with the turbine condenser of thermal power plant as the seawater of cooling water, the seawater after heat exchange is entered by side hermatic door Enter, in the closed irrigation canals and ditches with PE intermediaries water return duct 3 in intermediary's water heat exchange, and the heat is carried out by source pump Next round exchanges heat, to supply the factory building or house of irrigation canals and ditches both sides, so, even if user's dispersion, however, due to discharging seawater along row Channel is put in flow regime, each dispersion user can be supplied thermal energy to reach the purpose for obtaining heat nearby, and used sand Closely knit U-shaped PE intermediaries water return duct 3, on the one hand plays fixing pipe, and on the other hand, the heat transfer of sand preferably, is adapted to change Heat is used, if not using sand, once the easily impurity Long-Term Sorption of bonding is on pipe, and will extreme influence heat exchange effect Rate.

Seawater after exchanging heat for the first time is entered by side hermatic door, with PE intermediaries water return duct 3 in the closed irrigation canals and ditches In the heat exchange of intermediary water；One layer of water-permeable brick 4 is covered on the upper strata of PE intermediaries water return duct 3, the water-permeable brick 4 inclines laying, and Row's ditch is being dug out positioned at the vicinity of the water-permeable brick 4 for inclining lowest point, is making to connect with row's ditch positioned at the water-permeable brick 4 for inclining lowest point, Equipped with scraper plate, Pai Gouzhong is equipped with the track advanced for scraper plate to row's ditch；The upper lid 1 is inclined with the laying of water-permeable brick 4 Tilted direction is consistent；It is one layer of filtration to be formed between U-shaped PE intermediaries water return duct 3 and water inlet, is made using the purpose of water-permeable brick 4 Water can be exchanged heat by water-permeable brick 4 and impurity is filtered by water-permeable brick 4, and in order to avoid water-permeable brick 4 is by impurity bonding, inclined Tiltedly arrange, so that impurity receives Action of Gravity Field, by 4 row's of sliding down into ditch of water-permeable brick, as long as ditch is arranged in periodic cleaning, and make Drive scraper plate most to arrange ditch with track to be cleared up, it is possible to use the cycle of controller control cleaning and intensity, cleaning effect are preferable, Extend the use time and clearance time of water-permeable brick 4.The laying angle of inclination of the water-permeable brick is 7～12 degree, preferably 10 Degree, in this scenario, it may be preferred to attach permeable slip layer in water-permeable brick upper surface, so that impurity is more easy to slide falls into Pai Gou, It is in order that impurity is slid down onto row's ditch by gravity, as seawater is when power plant is introduced, that water-permeable brick inclines the purpose of laying Filtered once, thus, in discharge process, impurity seawater significantly relatively in the sea is few, in this case, need not cause Water-permeable brick angle of inclination is excessive；Water-permeable brick angle of inclination is big, and impurity easily falls, but but also causes seawater easily attached in row's ditch Problem that is near to gather, causing heat exchange uneven, and angle too small, impurity are difficult to fall into Pai Gou, find through a large amount of inclined experimentals, Above range is ideal, and within this range, impurity is easily slipped to the product of the seawater near Pai Gouzhong, and the row's of not resulting in ditch It is poly-, and upper lid 1 is consistent with the laying incline direction of water-permeable brick 4, in order to when there is overflow in the condensate of upper lid, due to The condensing water temperature for falling is different from ocean temperature to affect heat exchange uniform, thus, above-mentioned restriction is made, even if there is overflow, As incline direction is consistent, overflow water can be typically flowed near row's ditch, away from water-permeable brick, reduce the impact of heat exchanging.In this reality Apply in example, preferred seawater introduces the amount of closed irrigation canals and ditches and maintains and just do not had water-permeable brick or do not had water-permeable brick, and has not just had second Driving chain, now heat transfer effect is preferable.

However, it has been found in practice that, only being filtered using water-permeable brick 4, found in repeatedly putting into practice, water-permeable brick 4 makes It is still undesirable with the time, in order to increase the use time of water-permeable brick 4, also for filter effect is improved, increase heat exchange efficiency, saturating Corrosion-resistant net 5 is laid on the upper strata of water brick 4, and the corrosion-resistant net 5 is single layer of wires net, it is of course also possible to be multilayer steel wire, net Silk is uniformly arranged in transverse and longitudinal square crossing；Drive roll 6 and driven voller 7 are arranged on the bracing frame of left and right sides hermatic door, and first Driving chain 8 is connected with the front end of the drive roll 6 and the front end of the driven voller 7 respectively, the second driving chain 12 respectively with The rear end of the drive roll 6 is connected with the rear end of the driven voller 7, so that the drive roll 6 is linked with the driven voller 7, institute State corrosion-resistant net 5 to be covered on the first driving chain 8 or the second driving chain 12；With this so that the circulation transmission of corrosion-resistant net 5, Impurity is allowed to be bonded on steel wire, and in order to increase the filter effect and use time of steel wire, in the both sides sealing door One or two in bracing frame is provided with outer net perching knife, to root out the impurity of outer online bonding, the perching knife can coordinate with Support stretches out so as to can strike off outer net sticky object, with splicing groove under which, catches adhesive, with periodic cleaning, thus, the biography The corrosion-resistant net of motivation structure can stretch out hermatic door, i.e. perching knife, and on the hermatic door in outside, (perching knife is located at system confined space Outside, such as Fig. 1), with the sticky object of easy cleaning splicing groove, and in order to consider sealing, the perching knife can be placed in inner side On hermatic door (perching knife is located within system confined space, such as Fig. 2).

First water pipe at the non-U-shaped end of the PE intermediaries water return duct 3, the second water pipe are stretched out by the side hermatic door, The first described water pipe connects the water side of source pump evaporimeter, described the second water pipe connection source pump evaporimeter Water intake end, the water side of the condenser of the source pump connects the 3rd water pipe, and the water intake end of condenser connects the 4th water pipe.

In the present embodiment, as object of reference, into evaporimeter is high-temperature water to the evaporimeter with source pump, i.e. second pipe It is high-temperature conduit, have evaporimeter outflow is water at low temperature, i.e., first pipe is low temperature water pipe；In the same manner, with the condenser of source pump For object of reference, into condenser is water at low temperature, i.e., the 4th pipe is low temperature water pipe, and reserve condenser is high-temperature water, i.e., the 3rd Pipe is high-temperature conduit.Heat after seawater after the first time heat exchange is exchanged heat again by condenser with intermediary's water is exported, to supply factory The heating installation water heat exchange of room and house, so as to the waste heat of power plant is reclaimed.

In one embodiment, all equipment with contact with sea water, components and parts etc., are corrosion resistances.

As a kind of embodiment, it is a kind of based on seawater as cooling water thermal power plant's heat recovery method, including following step Suddenly：

S2. in the seawater discharge channel, selector distributing canal section is based on seawater as cooling water in installing above-described embodiment Thermal power plant's heat recovery system, and by seawater introduce channel introduce as cooling water seawater, by itself and turbine condenser Exchanged heat with the steam that liquefies, the heat exchange is to exchange heat for the first time, and the seawater (about 18 degree) after first time is exchanged heat is drained to sea Water discharges channel；

After the intermediary's water (about 10 degree) flowed in S3.PE intermediaries water return duct and the first time heat exchange for entering closed irrigation canals and ditches Seawater carries out second heat exchange, improves the temperature (about 15 degree) of intermediary's water, and intermediary's water of the intensification passes through source pump again Recuperated cycle is formed with heat demand device；

In second heat transfer process, the extra large evaporation of water vapour after exchanging heat for the first time is condensed in the inclination of closed irrigation canals and ditches Upper lid, and guiding gutter is entered with collection and purification water along condensate drainage channel, corrosion-resistant net circulation transmission is filtered, and by outer net Perching knife is scalped in transmission process and is bonded in corrosion-resistant online impurity, and the impurity arranged in ditch is periodically struck off by scraper plate.

The above, only the invention preferably specific embodiment, but the protection domain of the invention is not Be confined to this, any those familiar with the art in the technical scope that the invention is disclosed, according to the present invention The technical scheme of creation and its inventive concept equivalent or change in addition, should all cover the invention protection domain it It is interior.

Claims

1. it is a kind of based on seawater as cooling water thermal power plant's heat recovery method, it is characterised in that comprise the steps：

S2. in the seawater discharge channel selector distributing canal section install it is following based on seawater as cooling water thermal power plant's heat Recovery system, and channel introducing is introduced as the seawater of cooling water by seawater, which is exchanged heat with turbine condenser with liquid Change steam, the heat exchange is to exchange heat for the first time, and the seawater after first time is exchanged heat is drained to seawater discharge channel；

The intermediary's water flowed in S3.PE intermediaries water return duct carries out second with the seawater after the first time heat exchange into closed irrigation canals and ditches Secondary heat exchange, improves the temperature of intermediary's water, and intermediary's water of the intensification is formed with heat demand device by source pump again and changed Thermal cycle；

In second heat transfer process, the extra large evaporation of water vapour after exchanging heat for the first time is condensed in the inclination of closed irrigation canals and ditches Lid, and guiding gutter is entered with collection and purification water along condensate drainage channel, corrosion-resistant net circulation transmission is filtered, and is shoveled by outer net Knife is scalped in transmission process and is bonded in corrosion-resistant online impurity, and the impurity arranged in ditch is periodically struck off by scraper plate；

Thermal power plant's heat recovery system based on seawater as cooling water includes closed irrigation canals and ditches, and which has in tilt flat plate type Lid (1), the outer surface laying heat-insulation layer of the upper lid (1), along the incline direction of the upper lid (1), is opened up some thereon Condensate drainage channel, each drainage channel converge in the guiding gutter (2) on the inclination base for being placed in the upper lid (1), institute Hermatic door is installed at the both ends for stating closed irrigation canals and ditches, and the guiding gutter (2) is stretched out by hermatic door, and water inlet is arranged on side hermatic door On, and there is screen pack, the angle of inclination that (1) is covered in the tilt flat plate type is 5～10 degree；

The horizontal lower cover of the irrigation canals and ditches lays ZuUXing PE intermediaries water return duct (3), each PE intermediaries water return duct (3) of the group Between uniformly arrange in Semi surrounding type, and gap filling sand it is closely knit, each PE intermediaries water return duct (3) is provided with circulating pump, and Connect with intermediary water storage tank, and pacify cartridge control valve on connecting pipe；

Exchange heat with the turbine condenser of thermal power plant as the seawater of cooling water, the seawater after heat exchange is entered by side hermatic door, Exchange heat with the intermediary's water in PE intermediaries water return duct (3) in the closed irrigation canals and ditches；Cover on the upper strata of PE intermediaries water return duct (3) One layer of water-permeable brick (4) of lid, the water-permeable brick (4) incline laying, and are digging out positioned at the vicinity of the water-permeable brick (4) for inclining lowest point Row's ditch, makes to connect with row's ditch positioned at the water-permeable brick (4) for inclining lowest point；The upper lid (1) and the laying inclination side of water-permeable brick (4) To consistent, the angle of inclination of the water-permeable brick is 7～12 degree；

Corrosion-resistant net (5) is laid on the upper strata of water-permeable brick (4), and the corrosion-resistant net (5) is single layer of wires net, and twine is in that transverse and longitudinal is vertical Intersect uniform arrangement；Drive roll (6) and driven voller (7) on the bracing frame of left and right sides hermatic door, the first driving chain (8) be connected with the front end of the drive roll (6) and the front end of the driven voller (7) respectively, the second driving chain (12) respectively with The rear end of the drive roll (6) is connected with the rear end of the driven voller (7), so that the drive roll (6) and the driven voller (7) Linkage, the corrosion-resistant net (5) are covered on the first driving chain (8) or the second driving chain (12)；The both sides sealed door Bracing frame in one or two outer net perching knife is installed；

First water pipe at the non-U-shaped end of the PE intermediaries water return duct (3), the second water pipe are stretched out by the side hermatic door, should The first described water pipe connects the water side of source pump evaporimeter, described the second water pipe connection source pump evaporimeter Water intake end, the water side of the condenser of the source pump connect the 3rd water pipe, and the water intake end of condenser connects the 4th water pipe.