CN109945277A - A kind of energy conserving system being used for central heating using electric heat pump depth recycling remaining heat of flue gas from steam power plant - Google Patents

A kind of energy conserving system being used for central heating using electric heat pump depth recycling remaining heat of flue gas from steam power plant Download PDF

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Publication number
CN109945277A
CN109945277A CN201910224986.3A CN201910224986A CN109945277A CN 109945277 A CN109945277 A CN 109945277A CN 201910224986 A CN201910224986 A CN 201910224986A CN 109945277 A CN109945277 A CN 109945277A
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China
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flue gas
water
heat
valve
waste heat
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王海超
张若瑜
端木琳
李祥立
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Dalian University of Technology
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Dalian University of Technology
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00Integration of renewable energy sources in buildings
    • Y02B10/70Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/52Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency

Abstract

A kind of energy conserving system being used for central heating using electric heat pump depth recycling remaining heat of flue gas from steam power plant, is belonged to thermal power plant boiler flue gas waste heat recovery and utilizes technical field.High-temperature flue gas and recirculated water are directly contacted counterflow heat exchange using flue gas waste heat recovery tower by the present invention, electric heat pump is indirectly connected with by anti-corrosion High-efficient Water water plate heat exchanger with recirculated water, heat supply network return water enters in electric heat pump through anti-corrosion High-efficient Water water plate heat exchanger and high temperature circulation water indirect heat exchange, electric heat pump is using power plant's internal electric energy as driving heat source, if the heat supply network return water temperature after anti-corrosion High-efficient Water water plate heat exchanger and electric heat pump heating reaches supply water temperature requirement, send to heat supply network and supply water;If heat supply network return water temperature send to heat exchangers for district heating and is further heated lower than supply water temperature requirement.The present invention improves energy utilization rate, realizes flue gas waste heat recovery and desulfurization integrated function, and reduce pollutant emission, enhances the heat capacity of steam power plant, and the environment for reducing steam power plant influences.

Description

It is a kind of that central heating is used for using electric heat pump depth recycling remaining heat of flue gas from steam power plant Energy conserving system
Technical field
The invention belongs to Hazards in Power Plant boiler flue gas purification and flue gas waste heat recovery and technical field is utilized, in particular to Utilize electric heat pump technology that fume afterheat is used for central heating to a kind of, while the efficient flue gas waste heat for having both desulfurizing function returns Receipts system.
Background technique
Up to 130 DEG C~150 DEG C or so, waste heat returns the design exhaust gas temperature of China's Hazards in Power Plant station boiler at this stage Receipts have a high potential.It utilizes the flue gas waste heat recovery tower based on direct-contact heat exchanger to spray low-temperature flue gas to condense, it can With gasification latent heat in abundant recovered flue gas.Meanwhile the SO that flue gas carries in heat transfer process2、SO3It is dissolved in Sprayer Circulation water In, it is handled using lye, can reach desulfurization purpose, realizes the effect of collection flue gas waste heat recovery and desulfurizing function one Fruit.Residual neat recovering system, which can effectively be solved, often leads to equipment totality land occupation face independently of each other with desulfurizer (such as desulfurizing tower) The big problem of product, reduces investment and operating cost.
On the other hand, cogeneration units are run in the way of " electricity determining by heat ", this leads to unit, and there are coupled thermomechanics Problem: it is superfluous in electric load trough period unit generation amount, and in electric load peak period generated energy deficiency, it is unfavorable for solving electricity Power load peak-valley difference phenomenon, causes unit to lose peak modulation capacity, is unable to satisfy the requirement of China's thermoelectricity peak regulation at this stage.Heat at present The heat pump heat distribution system restriction by extracted steam from turbine parameter at runtime in power plant based on absorption type heat pump assembly, and make The thermal efficiency is lower, can not effectively realize that thermoelectricity decouples.Electric heat pump, which is applied to waste heat recycling field, certain advantage, first First, the heating efficiency of electric heat pump will be much higher than absorption heat pump;Secondly, the effect of absorption heat pump technology recovery waste heat by The limitation of unit steam extraction parameter, and electric heat pump runs directly using electric energy as drive energy and is more easier to control;Third, it is electronic Heat pump can consume electric energy, have the potentiality as peak regulation of power plant means.Power plant's valley electricity is consumed using electric heat pump, will be returned The fume afterheat of receipts can then increase the thermoelectricity peak modulation capacity of steam power plant for heating heat supply network return water.
In view of the above problems, a kind of utilization flue gas waste heat recovery tower combination electric heat pump depth Mist heat recovering use is designed In the energy conserving system of central heating.The system can effectively improve remaining heat of flue gas from steam power plant utilization rate, enhance steam power plant for thermal energy Power may be implemented power peak regulation and Heating Adjustment to a certain extent, and reduce the discharge of pollutant, have both economic benefit and ring Border benefit.
Summary of the invention
It is an object of the invention to propose it is a kind of using electric heat pump depth recycling remaining heat of flue gas from steam power plant for concentrate supply The energy conserving system of heat.
Technical solution of the present invention:
A kind of energy conserving system being used for central heating using electric heat pump depth recycling remaining heat of flue gas from steam power plant, including fire coal Boiler 1, steam turbine 2, condenser 3, heat exchangers for district heating 4, condensate tank 5, condensate transfer pump 6, deduster 7, fume afterheat return It receives tower 8, chimney 9, waste heat and recycles water circulating pump 10, anti-corrosion High-efficient Water water plate heat exchanger 11, electric heat pump 12, NaOH holding vessel 13, NaOH preparation facilities 14, NaOH solution pump 15, check-valves 16, smoke inlet valve 17, condensate liquid collecting-tank 21, by flue gas Road pipeline valve 37, multiple valves and connecting pipe;
8 inner wall of flue gas waste heat recovery tower has thermal insulation material, mainly by smoke inlet section, packing layer 18, spraying layer 19, demister 20 and exhanst gas outlet section composition;Smoke inlet section is located at the lower section of flue gas waste heat recovery tower 8, exhanst gas outlet section In the top of flue gas waste heat recovery tower 8;Demister 20 is located at the upper section of flue gas waste heat recovery tower 8, inside;Packing layer 18 is located at cigarette Middle section, the inside of gas waste heat recovery tower 8;Spraying layer 19 is located at the upper section of flue gas waste heat recovery tower 8, inside, and spraying layer 19 is located at 20 lower section of demister, 18 top of packing layer;The high-temperature flue gas that coal-burning boiler 1 generates is after 7 dust removal and filtration of deduster, then through cigarette Gas inlet valve 17 controls, and enters in flue gas waste heat recovery tower 8 through smoke inlet section, high-temperature flue gas flows from bottom to top;Circulation Water is sprayed from top to bottom by the spray equipment in spraying layer 19, and high-temperature flue gas carries out gas-liquid two-phase with shower water through packing layer 18 and fills Tap is touched, the water recovery heat release in high-temperature flue gas, and recirculated water absorbs high-temperature flue gas heat and enters 8 tower of flue gas waste heat recovery tower Bottom, the condensed water a part for returning to tower bottom continue to participate in circulation as recirculated water, and another part is through 8 bottom of flue gas waste heat recovery tower Valve control enter the condensate liquid collecting-tank 21 for being located at the lower section of flue gas waste heat recovery tower 8, realize the recycling of flue gas condensing water, reach To water-saving result;Low humidity flue gas after heat exchange removes water mist through demister 20, and dry flue gas is discharged from exhanst gas outlet section, into chimney 9, achieve the purpose that recovered flue gas waste heat of condensation;
The NaOH holding vessel 13 and NaOH preparation facilities 14 connect, and the lye in NaOH holding vessel 13 enters NaOH preparation Device 14, the desulfurization NaOH solution that NaOH preparation facilities 14 prepares are controlled by NaOH solution pump 15 through valve and check-valves 16 jointly System inputs along flue gas waste heat recovery tower 8, at this time a large amount of S0 in flue gas along pipeline2Gas has been dissolved in flue gas waste heat recovery tower 8 In condensed water, neutralization reaction occurs for condensed water and NaOH to achieve the purpose that desulfurization;
The electric heat pump 12 passes through the circulation of anti-corrosion High-efficient Water water plate heat exchanger 11 and 8 tower bottom of flue gas waste heat recovery tower Water is indirectly connected with, and recirculated water is from 8 bottom of flue gas waste heat recovery tower through waste heat recycling water circulating pump 10 or without remaining heat recovery cycle Water pump 10 is sent to anti-corrosion High-efficient Water water plate heat exchanger 11, and the recirculated water come out with the vaporizer side of electric heat pump 12 exchanges heat, Heat supply network return water is heated indirectly, is equipped with multiple valves on recirculated water transfer pipeline according to demand;It is after cooling low through exchanging heat Warm waste heat circulation water returns in flue gas waste heat recovery tower 8 along pipeline to be continued to exchange heat with flue gas spray, the conveying of low temperature exhaust heat recirculated water Multiple valves are equipped on pipeline according to demand;Heat supply network return water enters in electric heat pump 12 through valve control, recycles with high-temperature residual heat Water carries out indirect heat exchange by anti-corrosion High-efficient Water water plate heat exchanger 11, and electric heat pump 12 is using power plant's electric energy as driving energy Source;Enter from the heat supply network return water come out in electric heat pump 12 and carry out reheating in heat exchangers for district heating 4, until water temperature is added It send after heat to the supply water temperature for meeting service requirement to heat supply network;
Coal-burning boiler 1 is connected with steam turbine 2, and the steam that coal-burning boiler 1 generates enters in steam turbine 2 and is divided into after acting Steam exhaust and steam extraction two parts, steam exhaust enter condenser 3;Steam extraction enters in heat exchangers for district heating 4, laggard with the heat exchange condensation of heat supply network return water Enter condensate tank 5;The condensed water separated in condensed water and condensate tank 5 in condenser 3 send to condensate system and carries out It turns again in coal-burning boiler 1 and uses as boiler blow-down water after processing;The output pipe of condensate tank 5 is conveyed equipped with condensed water Pump 6;
Recirculated water recycles water circulating pump 10 through waste heat from 8 bottom of flue gas waste heat recovery tower or recycles water circulating pump without waste heat 10 send to anti-corrosion High-efficient Water water plate heat exchanger 11, and the recirculated water come out with the vaporizer side of electric heat pump 12 exchanges heat, circulation Multiple valves are equipped on water transfer pipeline according to demand, the set-up mode of valve: distinguished at waste heat recycling 10 both ends of water circulating pump Equipped with valve, bypass line is set outside through waste heat recycling water circulating pump 10, which is provided with two valves, which is located at The both ends of waste heat recycling 10 end valve of water circulating pump;When i.e. waste heat recycling water circulating pump 10 is overhauled, its both ends is closed Valve directly passes through bypass line by the high temperature circulation water come out in flue gas waste heat recovery tower 8 and enters follow-up process;
The inlet pipeline and flue gas waste heat recovery tower of 8 side of flue gas waste heat recovery tower of anti-corrosion High-efficient Water water plate heat exchanger 11 It is equipped with valve between the outlet pipeline of 8 sides, when anti-corrosion High-efficient Water water plate heat exchanger 11 is overhauled, closes anti-corrosion High-efficient Water The water outlet of valve and 8 side of flue gas waste heat recovery tower on the inlet pipeline of 8 side of flue gas waste heat recovery tower of water plate heat exchanger 11 Valve on pipeline, after directly passing through valve entrance between the two by the high temperature circulation water come out in flue gas waste heat recovery tower 8 Afterflow journey;
The inlet pipeline of heat supply network return water is equipped with valve, after the heating of electric heat pump 12, is passed into going out for heat exchangers for district heating 4 Water lines are equipped with valve, are equipped with another valve between two valves;Electric heat pump 12 and anti-corrosion High-efficient Water water plate heat exchanger 11 Valve is equipped in connected water inlet pipe and water outlet pipe;When electric heat pump 12 is overhauled, except being equipped between two valves Another valve opening outside, close remaining four valve, heat supply network return water directly enters follow-up process by another valve;
The pipeline and high-temperature flue gas of the exhanst gas outlet section connection at 8 top of flue gas waste heat recovery tower enter cigarette through smoke inlet section The pipeline of gas waste heat recovery tower 8 is equipped with gas bypass pipeline valve 37, and gas bypass pipeline valve 37 is located at waste heat recovery tower Outside smoke inlet valve 17, gas bypass pipeline valve 37 is opened when flue gas waste heat recovery tower 8 breaks down or overhauls, high Warm flue gas is directly entered chimney 9 after 7 dedusting of deduster and is discharged into atmosphere.
Beneficial effects of the present invention: fume afterheat is used for central heating using electric heat pump by the present invention, and combines flue gas Waste heat recovery tower and anti-corrosion High-efficient Water water plate heat exchanger, which are realized, recycles low-temperature flue gas waste heat depth.Cigarette in the present invention Gas waste heat recovery tower uses flue gas and water direct contact type heat transfer technology, improves heat and mass effect, enhances exchange capability of heat, Desulfurizing function is had both simultaneously, PM2.5 discharge is effectively reduced, flue gas waste heat recovery and dedusting and desulphurization integrated purpose may be implemented. The present invention is used for central heating using electric heat pump Mist heat recovering, and the high-temperature residual heat recirculated water after absorbing fume afterheat passes through Anti-corrosion High-efficient Water water plate heat exchanger and electric heat pump indirect heat exchange avoid recirculated water from being directly entered in heat pump and cause corruption to it Erosion.With after the heat exchange of heat supply network return water, recirculated water return water temperature is minimum to be down to 25 DEG C or so, and flue-gas temperature is 33 DEG C of left sides at this time The right side, to improve the working efficiency of flue gas waste heat recovery tower.Heat pump system can guarantee all may be used under any operating condition of heat supply network To realize efficient waste heat recycling, flue gas waste heat recovery tower is combined with electric heat pump, efficiently solves flue gas waste heat recovery The problems such as prepared by metal erosion existing for field and low temperature cold source.And fume afterheat is used to heat heat supply network in Heating Season and is returned Water enhances the heat capacity of steam power plant, while electric heat pump can consume dump energy inside power plant, improve steam power plant's thermoelectricity Than enhancing power peak regulation ability, realizing thermoelectricity decoupling to a certain extent, provided for renewable energy such as wind-powered electricity generation, photoelectricity Net space.
Detailed description of the invention
Fig. 1 is a kind of energy conservation that central heating is used for using electric heat pump depth recycling remaining heat of flue gas from steam power plant of the invention System diagram.
In figure: 1 coal-burning boiler;2 steam turbines;3 condensers;4 heat exchangers for district heatings;5 condensate tanks;6 condensate transfer pumps;7 Deduster;8 flue gas waste heat recovery towers;9 chimneys;10 waste heats recycle water circulating pump;11 anti-corrosion High-efficient Water water plate heat exchangers;12 electricity Dynamic heat pump;13NaOH holding vessel;14NaOH preparation facilities;15NaOH solution pump;16 check-valves;17 smoke inlet valves;18 fill out The bed of material;19 spraying layers;20 demisters;21 condensate liquid collecting-tanks;22 valve a;23 valve b;24 valve c;25 valve d;26 valves e;27 valve f;28 valve g;29 valve h;30 valve i;31 valve j;32 valve k;32 valve l;33 valve m;34 valve n;35 Valve o;36 valve p;37 gas bypass pipeline valves.
Specific embodiment
Below in conjunction with attached drawing and technical solution, a specific embodiment of the invention is further illustrated.
A kind of energy conserving system being used for central heating using electric heat pump depth recycling remaining heat of flue gas from steam power plant, including fire coal Boiler 1, steam turbine 2, condenser 3, heat exchangers for district heating 4, condensate tank 5, condensate transfer pump 6, deduster 7, fume afterheat return It receives tower 8, chimney 9, waste heat and recycles water circulating pump 10, anti-corrosion High-efficient Water water plate heat exchanger 11, electric heat pump 12, NaOH holding vessel 13, NaOH preparation facilities 14, NaOH solution pump 15, check-valves 16, smoke inlet valve 17, condensate liquid collecting-tank 21, by flue gas Road pipeline valve 37, multiple valves and connecting pipe;
8 inner wall of flue gas waste heat recovery tower have thermal insulation material, mainly by smoke inlet section, packing layer 18, spraying layer 19, remove Day with fog 20 and exhanst gas outlet section composition;Smoke inlet section is located at the lower section of flue gas waste heat recovery tower 8, and exhanst gas outlet section is located at flue gas The top of waste heat recovery tower 8;Demister 20 is located at the upper section of flue gas waste heat recovery tower 8, inside;Packing layer 18 is located at fume afterheat Middle section, the inside of recovery tower 8;Spraying layer 19 is located at the upper section of flue gas waste heat recovery tower 8, inside, and spraying layer 19 is located at demister 20 lower sections, 18 top of packing layer;The high-temperature flue gas that coal-burning boiler 1 generates is after 7 dust removal and filtration of deduster, then through smoke inlet Valve 17 controls, and enters in flue gas waste heat recovery tower 8 through smoke inlet section, high-temperature flue gas flows from bottom to top;Recirculated water is by spraying Spray equipment in drenching layer 19 sprays from top to bottom, and high-temperature flue gas carries out gas-liquid two-phase with shower water through packing layer 18 and sufficiently connects It touching, the water recovery heat release in high-temperature flue gas, recirculated water absorbs high-temperature flue gas heat and enters 8 tower bottom of flue gas waste heat recovery tower, The condensed water a part for returning to tower bottom continues to participate in circulation as recirculated water, and another part is through 8 bottom of flue gas waste heat recovery tower Valve control enters the condensate liquid collecting-tank 21 for being located at 8 lower section of flue gas waste heat recovery tower, realizes the recycling of flue gas condensing water, reaches Water-saving result;Low humidity flue gas after heat exchange removes water mist through demister 20, and dry flue gas is discharged from exhanst gas outlet section, into chimney 9, Achieve the purpose that recovered flue gas waste heat of condensation;
NaOH holding vessel 13 and NaOH preparation facilities 14 connect, and the lye in NaOH holding vessel 13 enters NaOH preparation facilities The desulfurization NaOH solution that 14, NaOH preparation facilities 14 prepare is controlled by NaOH solution pump 15 through valve p36 and check-valves 16 jointly System inputs along flue gas waste heat recovery tower 8, at this time a large amount of S0 in flue gas along pipeline2Gas has been dissolved in flue gas waste heat recovery tower 8 In condensed water, neutralization reaction occurs for condensed water and NaOH to achieve the purpose that desulfurization;
Between the recirculated water that electric heat pump 12 passes through 8 tower bottom of anti-corrosion High-efficient Water water plate heat exchanger 11 and flue gas waste heat recovery tower It connects in succession, recirculated water, which is driven from 8 bottom of flue gas waste heat recovery tower by waste heat circulation water pump 10, successively passes through valve d25, valve e26 It send with valve g28 to anti-corrosion High-efficient Water water plate heat exchanger 11, the recirculated water come out with the vaporizer side of electric heat pump 12 changes Heat indirectly heats heat supply network return water, and the low temperature exhaust heat recirculated water after cooling that exchanged heat returns to flue gas along pipeline through valve i30 Continue to exchange heat with flue gas spray in waste heat recovery tower 8;Heat supply network return water enters in electric heat pump 12 through valve m33 control, with high temperature Waste heat circulation water by anti-corrosion High-efficient Water water plate heat exchanger 11 carry out indirect heat exchange, electric heat pump 12 using power plant's electric energy as Drive energy;Enter from the heat supply network return water come out in electric heat pump 12 and carry out reheating in heat exchangers for district heating 4, until water body temperature Degree is sent after being heated to the supply water temperature for meeting service requirement to heat supply network;
The steam that coal-burning boiler 1 generates enters and is divided into steam exhaust and steam extraction two parts in steam turbine 2 after acting, and steam exhaust enters Condenser 3;Steam extraction enters in heat exchangers for district heating 4, enters condensate tank 5 after condensing with the heat exchange of heat supply network return water;It is cold in condenser 3 The condensed water separated in condensate and condensate tank 5 is sent to condensate system handled after turned again to as boiler blow-down water It is used in coal-burning boiler 1;The output pipe of condensate tank 5 is equipped with condensate transfer pump 6;
The pipeline and high-temperature flue gas of the exhanst gas outlet section connection at 8 top of flue gas waste heat recovery tower enter cigarette through smoke inlet section The pipeline of gas waste heat recovery tower 8 is equipped with gas bypass pipeline valve 37, and gas bypass pipeline valve 37 is located at waste heat recovery tower Outside smoke inlet valve 17, when the maintenance of waste heat recovery tower, smoke inlet valve 17 is closed, opens gas bypass pipeline valve 37, the flue gas come out from deduster is directly discharged by chimney 9;
Multiple valves are equipped on recirculated water transfer pipeline according to demand, the set-up mode of valve: recycling recirculated water in waste heat It pumps 10 both ends and is respectively equipped with valve d25 and valve e26, bypass line is set outside through waste heat recycling water circulating pump 10, is set thereon There are valve c24 and valve f27, two valves are located at the both ends of valve d25 and valve e26;When waste heat recycles water circulating pump 10 When being overhauled, valve d25 and valve e26 is closed, side is directly passed through by the high temperature circulation water come out in flue gas waste heat recovery tower 8 Siphunculus road enters follow-up process;
The inlet pipeline and flue gas waste heat recovery tower of 8 side of flue gas waste heat recovery tower of anti-corrosion High-efficient Water water plate heat exchanger 11 Valve g28, valve h29 and valve i30 are equipped between the outlet pipeline of 8 sides, when anti-corrosion High-efficient Water water plate heat exchanger 11 carries out When maintenance, valve g28 and valve i30 is closed, valve is directly passed through by the high temperature circulation water come out in flue gas waste heat recovery tower 8 H29 enters follow-up process;
The inlet pipeline of heat supply network return water is equipped with valve m33, after the heating of electric heat pump 12, is passed into heat exchangers for district heating 4 Outlet pipeline be equipped with valve o35, valve n34 is equipped between two valves;Valve j31 and valve k32 is arranged in electric heat pump On circulation line between 12 and anti-corrosion High-efficient Water water plate heat exchanger 11;When electric heat pump 12 is overhauled, valve is closed J31, valve k32, valve m33 and valve o35, heat supply network return water directly pass through valve n34 and enter follow-up process.
In Heating Period, it is assumed that heat supply network return water temperature is Th, flue gas waste heat recovery tower 8 come out circulating water temperature be Ttc, benefit Carry out flue gas waste heat recovery with anti-corrosion High-efficient Water water plate heat exchanger 11 and the series connection of electric heat pump 12: heat supply network return water enters electronic heat In pump 12, indirect heat exchange is carried out by the recirculated water that anti-corrosion High-efficient Water water plate heat exchanger 11 and flue gas waste heat recovery tower 8 come out, Heat supply network return water temperature rises Δ T at this time1, the consumption power plant's internal electric energy of electric heat pump 12 is as driving electric energy;If heat supply network returns at this time Temperature (the T of waterh+ΔT1) greater-than match service requirement supply water temperature (Tg), i.e. (Th+ΔT1)≥Tg, then close valve b23, Central heating system heat is supplied by fume afterheat supply, without the heating of heat exchangers for district heating 4 Open valve o35 completely at this time;If The temperature of heat supply network return water is not up to the supply water temperature for meeting service requirement, i.e., (T at this timeh+ΔT1)<Tg, then Open valve b23 and Heat supply network return water is sent to heat exchangers for district heating 4 and is further heated by valve o35, but heating amount only needs to meet temperature rise Tg-(Th+ ΔT1), so that the steam extraction amount of heat exchangers for district heating 4 be greatly decreased, reach energy saving purpose.
The above is only a preferred embodiment of the present invention, it is not intended to restrict the invention, it is noted that for this skill For the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is several improvement and Modification, these improvements and modifications also should be regarded as protection scope of the present invention.

Claims (8)

1. a kind of energy conserving system for being used for central heating using electric heat pump depth recycling remaining heat of flue gas from steam power plant, feature are existed In, including coal-burning boiler (1), steam turbine (2), condenser (3), heat exchangers for district heating (4), condensate tank (5), condensate transfer pump (6), deduster (7), flue gas waste heat recovery tower (8), chimney (9), waste heat recycling water circulating pump (10), anti-corrosion High-efficient Water water are board-like Heat exchanger (11), electric heat pump (12), NaOH holding vessel (13), NaOH preparation facilities (14), NaOH solution pump (15), check-valves (16), smoke inlet valve (17), condensate liquid collecting-tank (21), gas bypass pipeline valve (37), multiple valves and connecting tube Road;
Flue gas waste heat recovery tower (8) inner wall has thermal insulation material, mainly by smoke inlet section, packing layer (18), spraying layer (19), demister (20) and exhanst gas outlet section composition;Smoke inlet section is located at the lower section of flue gas waste heat recovery tower (8), and flue gas goes out Mouth section is located at the top of flue gas waste heat recovery tower (8);Demister (20) is located at the upper section of flue gas waste heat recovery tower (8), inside;It fills out The bed of material (18) is located at middle section, the inside of flue gas waste heat recovery tower (8);Spraying layer (19) is located at the upper of flue gas waste heat recovery tower (8) Section, inside, spraying layer (19) are located at below demister (20), above packing layer (18);The high-temperature flue gas that coal-burning boiler (1) generates It is controlled after deduster (7) dust removal and filtration, then through smoke inlet valve (17), enters flue gas waste heat recovery through smoke inlet section In tower (8), high-temperature flue gas flows from bottom to top;Recirculated water is sprayed from top to bottom by the spray equipment in spraying layer (19), high temperature Flue gas carries out gas-liquid two-phase with shower water through packing layer (18) and comes into full contact with, the water recovery heat release in high-temperature flue gas, circulation Water absorbs high-temperature flue gas heat and enters flue gas waste heat recovery tower (8) tower bottom, returns to condensed water a part of tower bottom as recirculated water Circulation is continued to participate in, another part enters through the valve control of flue gas waste heat recovery tower (8) bottom and is located at flue gas waste heat recovery tower (8) the condensate liquid collecting-tank (21) below realizes the recycling of flue gas condensing water, reaches water-saving result;Low humidity flue gas after heat exchange Water mist is removed through demister (20), dry flue gas is discharged from exhanst gas outlet section, into chimney (9), reaches recovered flue gas waste heat of condensation Purpose;
The NaOH holding vessel (13) and NaOH preparation facilities (14) connect, and the lye in NaOH holding vessel (13) enters NaOH system Standby device (14), the desulfurization NaOH solution that NaOH preparation facilities (14) prepares is by NaOH solution pump (15) through valve and check-valves (16) co- controlling inputs in flue gas waste heat recovery tower (8), at this time a large amount of S0 in flue gas along pipeline2Gas has been dissolved in cigarette In gas waste heat recovery tower (8) condensed water, neutralization reaction occurs for condensed water and NaOH to achieve the purpose that desulfurization;
The electric heat pump (12) is followed by anti-corrosion High-efficient Water water plate heat exchanger (11) and flue gas waste heat recovery tower (8) tower bottom Ring water is indirectly connected with, and recirculated water is returned from flue gas waste heat recovery tower (8) bottom through waste heat recycling water circulating pump (10) or without waste heat It receives water circulating pump (10) to send to anti-corrosion High-efficient Water water plate heat exchanger (11), be come out with the vaporizer side of electric heat pump (12) Recirculated water heat exchange, indirectly heats heat supply network return water, is equipped with multiple valves on recirculated water transfer pipeline according to demand;Through exchanging heat Low temperature exhaust heat recirculated water after cooling returns in flue gas waste heat recovery tower (8) along pipeline to be continued to exchange heat with flue gas spray, more than low temperature Multiple valves are equipped on heat recirculated water transfer pipeline according to demand;Heat supply network return water enters in electric heat pump (12) through valve control, Indirect heat exchange is carried out by anti-corrosion High-efficient Water water plate heat exchanger (11) with high-temperature residual heat recirculated water, electric heat pump (12) utilizes electricity Factory's electric energy is as drive energy;It is secondary that the heat supply network return water come out from electric heat pump (12) enters progress in heat exchangers for district heating (4) Heating, until water temperature is sent after being heated to the supply water temperature for meeting service requirement to heat supply network;
Coal-burning boiler (1) is connected with steam turbine (2), and the steam that coal-burning boiler (1) generates enters in steam turbine (2) after acting It is divided into steam exhaust and steam extraction two parts, steam exhaust enters condenser (3);Steam extraction enters in heat exchangers for district heating (4), exchanges heat with heat supply network return water Enter condensate tank (5) after condensation;The condensed water separated in condensed water and condensate tank (5) in condenser (3) send to Condensate system is turned again in coal-burning boiler (1) as boiler blow-down water after being handled and is used;The efferent duct of condensate tank (5) Road is equipped with condensate transfer pump (6).
2. the energy conservation according to claim 1 for being used for central heating using electric heat pump depth recycling remaining heat of flue gas from steam power plant System, which is characterized in that be equipped with multiple valves on the recirculated water transfer pipeline according to demand, the set-up mode of valve is remaining Heat recovery cycle water pump (10) both ends are respectively equipped with valve, and bypass line is being arranged outside through waste heat recycling water circulating pump (10), Two valves are equipped with, which is located at the both ends of waste heat recycling water circulating pump (10) end valve;That is waste heat recycling follows When ring water pump (10) is overhauled, the valve at its both ends is closed, it is straight by the high temperature circulation water come out in flue gas waste heat recovery tower (8) It connected bypass line and enters follow-up process.
3. according to claim 1 or 2 be used for central heating using electric heat pump depth recycling remaining heat of flue gas from steam power plant Energy conserving system, which is characterized in that the inlet pipeline of flue gas waste heat recovery tower (8) side of anti-corrosion High-efficient Water water plate heat exchanger (11) Valve is equipped between the outlet pipeline of flue gas waste heat recovery tower (8) side, when anti-corrosion High-efficient Water water plate heat exchanger (11) carries out When maintenance, the valve on the inlet pipeline of flue gas waste heat recovery tower (8) side of anti-corrosion High-efficient Water water plate heat exchanger (11) is closed With the valve on the outlet pipeline of flue gas waste heat recovery tower (8) side, by the high temperature circulation water come out in flue gas waste heat recovery tower (8) Follow-up process is directly entered by valve between the two.
4. according to claim 1 or 2 be used for central heating using electric heat pump depth recycling remaining heat of flue gas from steam power plant Energy conserving system, which is characterized in that the inlet pipeline of heat supply network return water is equipped with valve, after electric heat pump (12) heating, is passed into The outlet pipeline of heat exchangers for district heating (4) is equipped with valve, is equipped with another valve between two valves;Electric heat pump (12) and anti-corrosion are high Valve is equipped in the connected water inlet pipe and water outlet pipe of effect water water plate heat exchanger (11);When electric heat pump (12) is examined When repairing, in addition to another valve opening being equipped between two valves, remaining four valve is closed, heat supply network return water directly passes through another valve Door enters follow-up process.
5. the energy conservation according to claim 3 for being used for central heating using electric heat pump depth recycling remaining heat of flue gas from steam power plant System, which is characterized in that the inlet pipeline of heat supply network return water is equipped with valve, after electric heat pump (12) heating, is passed into heat supply network The outlet pipeline of heater (4) is equipped with valve, is equipped with another valve between two valves;Electric heat pump (12) and anti-corrosion High-efficient Water Valve is equipped in the connected water inlet pipe and water outlet pipe of water plate heat exchanger (11);When electric heat pump (12) is overhauled When, in addition to another valve opening being equipped between two valves, remaining four valve is closed, heat supply network return water directly passes through another valve Into follow-up process.
6. according to claim 1,2 or 5 any use electric heat pump depth recycling remaining heat of flue gas from steam power plant are for concentrating The energy conserving system of heat supply, which is characterized in that the pipeline and high temperature cigarette of the exhanst gas outlet section connection at the top of flue gas waste heat recovery tower (8) The pipeline that gas enters flue gas waste heat recovery tower (8) through smoke inlet section is equipped with gas bypass pipeline valve (37), gas bypass Pipeline valve (37) is located at waste heat recovery tower smoke inlet valve (17) outside, and gas bypass pipeline valve (37) is returned in fume afterheat It receives tower (8) to break down or open when overhauling, high-temperature flue gas is directly entered chimney (9) after deduster (7) dedusting and is discharged into greatly In gas.
7. the energy conservation according to claim 3 for being used for central heating using electric heat pump depth recycling remaining heat of flue gas from steam power plant System, which is characterized in that the pipeline and high-temperature flue gas of the exhanst gas outlet section connection at the top of flue gas waste heat recovery tower (8) enter through flue gas The pipeline that mouth section enters flue gas waste heat recovery tower (8) is equipped with gas bypass pipeline valve (37), gas bypass pipeline valve (37) it is located at waste heat recovery tower smoke inlet valve (17) outside, gas bypass pipeline valve (37) is in flue gas waste heat recovery tower (8) It breaks down or is opened when overhauling, high-temperature flue gas is directly entered chimney (9) after deduster (7) dedusting and is discharged into atmosphere.
8. the energy conservation according to claim 4 for being used for central heating using electric heat pump depth recycling remaining heat of flue gas from steam power plant System, which is characterized in that the pipeline and high-temperature flue gas of the exhanst gas outlet section connection at the top of flue gas waste heat recovery tower (8) enter through flue gas The pipeline that mouth section enters flue gas waste heat recovery tower (8) is equipped with gas bypass pipeline valve (37), gas bypass pipeline valve (37) it is located at waste heat recovery tower smoke inlet valve (17) outside, gas bypass pipeline valve (37) is in flue gas waste heat recovery tower (8) It breaks down or is opened when overhauling, high-temperature flue gas is directly entered chimney (9) after deduster (7) dedusting and is discharged into atmosphere.
CN201910224986.3A 2019-03-25 2019-03-25 A kind of energy conserving system being used for central heating using electric heat pump depth recycling remaining heat of flue gas from steam power plant Pending CN109945277A (en)

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