CN104949101B - Secondary reheat unit economizer variable-area waste heat utilizing system - Google Patents

Secondary reheat unit economizer variable-area waste heat utilizing system Download PDF

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CN104949101B
CN104949101B CN201510195093.2A CN201510195093A CN104949101B CN 104949101 B CN104949101 B CN 104949101B CN 201510195093 A CN201510195093 A CN 201510195093A CN 104949101 B CN104949101 B CN 104949101B
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heat exchanger
economizer
nicotiana tabacum
heater
water inlet
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CN104949101A (en
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徐钢
韩宇
李永毅
侯勇
杨勇平
刘文毅
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North China Electric Power University
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North China Electric Power University
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Abstract

The invention discloses a secondary reheat unit economizer variable-area waste heat utilizing system which belongs to the field of power station energy saving. The system comprises an economizer, a main flue, a bypass flue, an air preheater, a high-temperature smoke-water heat exchanger, a low-temperature smoke-water heat exchanger, a high-low-pressure regenerative heater, a steam bleeding type air heater and a smoke type air heater. The system has the advantages that the smoke type air heater and the steam bleeding type air heater are serially connected to preheat cold air; the system uses low-temperature smoke waste heat and low-pressure extracted steam to heat the air so as to extract high-grade smoke heat through replacement, the high-grade smoke heat is used for heating water supply and condensate under high load, and high-pressure extracted steam for heat regeneration is pushed aside; under low load, the front section of the high-temperature smoke-water heat exchanger does not push aside heat regeneration extracted steam and used for heating the boiler water supply behind the regenerative heater and in front of the economizer, coal is saved, deep energy saving and consumption reduction of a coal-fired power generating unit are achieved, and evident economic benefits are achieved.

Description

Double reheat power generation sets economizer variable area bootstrap system
Technical field
The invention belongs to power station energy-saving field, particularly to a kind of double reheat power generation sets economizer variable area UTILIZATION OF VESIDUAL HEAT IN system System.
Background technology
The energy-saving and emission-reduction of Large-scale fire-electricity unit are the important energy source strategies of China.For adapt to electricity market fast development and The immense pressure of energy-saving and emission-reduction, improves the operational efficiency of heat power equipment, development of latent energy-saving potential has become each power plant pay attention to day by day Problem.
In recent years in order to improve efficiency of plant, China greatly develops double reheat power generation sets, and current China is existing multiple secondary Reheating embrittlement is being built, and can achieve in a short time goes into operation runs, however, double reheat power generation sets still have certain energy-saving potential, with When some problems are existed on the arrangement of back-end surfaces, first, advanced therrmodynamic system leads to the pot of double reheat power generation sets Stove inlet water temperature is higher, enters that stove air capacity is relatively low, and in boiler tail, water is less with the caloric receptivity of air, and therefore exhaust gas temperature is relatively Height, causes very big energy dissipation;Secondly, under full capacity, economizer inlet water temperature is higher, economizer for double reheat power generation sets Heat exchange amount is less with required heat exchange area, but in underload, economizer inlet water temperature is relatively low, needs larger heat-transfer surface Long-pending, if therefore considering variable working condition, the economizer of double reheat power generation sets is difficult to design and arrangement.
The present invention proposes a kind of double reheat power generation sets economizer variable area bootstrap system, solves above-mentioned technology Deficiency, its core design thought is: by high temperature succi Nicotiana tabacum L. heat exchanger is divided into two sections, arranges two water inlets, Rational choice The position drawn water a little, and by the on-off control of valve so that high temperature succi Nicotiana tabacum L. heat exchanger heats high-pressure heater under high loads Middle condensate, exclusion steam turbine high-grade is drawn gas, and not only squeezes extracted steam from turbine at low load, also functions to part economizer Effect;Meanwhile, double reheat power generation sets economizer variable area bootstrap system utilizes flue gas formula air heater to reduce row Cigarette temperature, arranges bled steam type air heater after flue gas formula air heater simultaneously, improves further into stove air themperature, put Swapped out substantial amounts of high-grade fume afterheat.Double reheat power generation sets economizer variable area bootstrap system adequately achieves energy Boil on the nape opposite the mouth, cascade utilization, are greatly improved unit efficiency, solve double reheat power generation sets economizer simultaneously and are difficult to asking of design arrangement Topic, is an energy-saving and emission-reduction new technique being applied to double reheat power station.
Content of the invention
The purpose of the present invention is to propose to a kind of double reheat power generation sets economizer variable area bootstrap system, this system master Economizer to be included, flue collector, bypass flue, air preheater, high temperature succi Nicotiana tabacum L. heat exchanger, low temperature succi Nicotiana tabacum L. heat exchanger, backheat add Hot device, bled steam type air heater and flue gas formula air heater;It is characterized in that: propose a kind of double reheat power generation sets and save coal Device variable area bootstrap system, this system mainly includes economizer, flue collector, bypass flue, air preheater, high temperature succi Nicotiana tabacum L. Heat exchanger, low temperature succi Nicotiana tabacum L. heat exchanger, high-low pressure bleeder heater, bled steam type air heater and flue gas formula air heater; It is characterized in that: boiler back end ductwork is separated into flue collector 1 and the bypass flue 2 of parallel connection, economizer 3 or be arranged in afterbody cigarette In flue before road, or it is arranged in bypass flue 2;Arrange air preheater 4, in flue collector 1 before air preheater 4 successively Setting bled steam type air heater 7 and flue gas formula air heater 8;It is sequentially arranged high temperature succi Nicotiana tabacum L. heat exchanger 5 He in bypass flue 2 Low temperature succi Nicotiana tabacum L. heat exchanger 6, wherein, high temperature succi Nicotiana tabacum L. heat exchanger 5 is divided into the two sections of series connection, in the setting of the junction of two sections Middle part water inlet a, arranges end water inlet b in the other end of hypomere, arranges outlet c in the other end of epimere;Its end enters Mouth of a river b is connected with the water inlet of No. 4 high-pressure extraction heaters 9, and middle part water inlet a is added with No. 1 high-pressure extraction by valve 10 The water outlet of hot device 11 is connected, and arranges service main between the outlet c of middle part water inlet a and high temperature succi Nicotiana tabacum L. heat exchanger 5 Road valve 12, service main road valve 12 outlet is connected with the outlet c of economizer 3 water inlet and high temperature succi Nicotiana tabacum L. heat exchanger 5; The water inlet of low temperature succi Nicotiana tabacum L. heat exchanger 6 is connected with the water inlet of No. 7 low pressure bleeder heaters 13, the going out of low temperature succi Nicotiana tabacum L. heat exchanger 6 The mouth of a river is connected with the outlet of No. 6 low pressure bleeder heaters 14;Oxygen-eliminating device 15 outlet is added with No. 4 low pressure backheats by feed pump 16 The water inlet of hot device is connected with the end water inlet b of high temperature succi Nicotiana tabacum L. heat exchanger 5;Bled steam type air heater 7 enter vapourMouthful No. 7 are drawn gas with steam turbineMouth, steam turbine No. 8 are drawn gasMouth and steam turbine No. 9 are drawn gasMouth is connected;Steam-extracting type air adds The water outlet of hot device 7Mouth and No. 7 low pressure bleeder heaters 13, No. 8 low pressure bleeder heaters and No. 9 low pressure bleeder heaters The corresponding drain pipe that draws gasIt is connected;Flue gas formula air heater 8 is hydrophily formula heat exchanger, and its air side is arranged in draws gas The lower end of formula air heater 7, fume side is arranged in the converging in flue of boiler end.
The air intake of described bled steam type air heater 7 is drawn gas for No. 7 with steam turbineMouth, No. 8 extracted steam from turbines of steam turbineMouth and steam turbine No. 9 are drawn gasMouth connects, according to the different extracted steam from turbine extracting different extraction openings of load, steam-extracting type sky Hot-air heater 7 outlet and the corresponding aqueduct drawing gasIt is connected.
In described air heating procedure, cold air is tentatively heated first in flue gas formula air heater 8, then enters Heat further in bled steam type air heater 7, subsequently into air preheater (4);
The economizer variable area method of described double reheat power generation sets economizer variable area bootstrap system, in high load capacity Under: the valve 10 being connected with the middle part water inlet a of high temperature succi Nicotiana tabacum L. heat exchanger 5 is closed, and service main road valve 10 is opened, high temperature cigarette 11, No. 2 high-pressure extraction heaters of No. 1 high-pressure extraction heater of the replacing whole of water- to-water heat exchanger 5, No. 3 high-pressure extraction heaters and 4 The heating feedwater of number high-pressure extraction heater 9, squeezes the high pressure extraction for backheat, thus increasing steam turbine power;In underload Under, service main road valve 12 valve closing, the valve 10 being connected with the middle part water inlet a of high temperature succi Nicotiana tabacum L. heat exchanger 5 is opened, high The epimere of warm succi Nicotiana tabacum L. heat exchanger 5 does not squeeze regenerative steam, but for heating the boiler feedwater before the economizer 3 after backheat, this The epimere of Shi Gaowen succi Nicotiana tabacum L. heat exchanger 5 is equivalent to the economizer of a series connection, thus the total heating surface increasing economizer amasss.
Double reheat power generation sets economizer variable area bootstrap system of the present invention has a characteristic that
1. high temperature succi Nicotiana tabacum L. heat exchanger is divided into two sections, two water inlets, Rational choice are set at middle part and end The position that water inlet draws water a little, under different load, is adjusted by the open and close of valve.Under high load capacity, two sections are all used Substituting the feedwater of high-pressure heater heating part, squeezing the high pressure extraction for backheat, thus increasing steam turbine power;Low negative Under lotus, epimere porch valve is opened, valve closing at service main road, and hypomere substitutes high-pressure heater heating feedwater, exclusion High-grade extracted steam from turbine, epimere heats the whole feedwater before economizer entrance, plays the effect of part economizer;Reach and filled Division reason is using the effect of fume afterheat, and solves the problems, such as that double reheat power generation sets economizer is difficult to design arrangement.
2. bled steam type air heater and the flue gas formula air heater of arranged in series, flue gas are set before air preheater Formula air heater can effectively reduce cigarette temperature, improves boiler efficiency, and bled steam type air heater then achieves and improves further The air themperature of air preheater entrance can be promoted to 100 DEG C about by the effect of air themperature.
3. this system flexibly opens, and according to the difference of unit parameter and load, the steam turbine that can extract diverse location is taken out Vapour is heating air.
4. this system flexibly opens, and according to station boiler form and the factors such as design arrangement, economizer both may be arranged at tail In flue before portion's flue, it is also disposed in bypass flue.
Brief description
Fig. 1 is double reheat power generation sets economizer variable area bootstrap system schematic diagram.
The double reheat power generation sets economizer variable area bootstrap system that Fig. 2 is arranged in bypass flue for economizer is illustrated Figure.
Specific embodiment
The present invention proposes a kind of double reheat power generation sets economizer variable area bootstrap system.Below in conjunction with the accompanying drawings and example It is explained.
In double reheat power generation sets economizer variable area bootstrap system schematic diagram as shown in Figure 1, double reheat power generation sets Economizer variable area bootstrap system mainly includes economizer, flue collector, bypass flue, air preheater, high temperature succi Nicotiana tabacum L. change Hot device, low temperature succi Nicotiana tabacum L. heat exchanger, bleeder heater, bled steam type air heater and flue gas formula air heater;Boiler tail Flue is separated into flue collector 1 and the bypass flue 2 of parallel connection, and economizer 3 is arranged in the flue before back-end ductwork or arranges In bypass flue 2;Arrange air preheater 4 in flue collector 1, before air preheater 4, set gradually bled steam type air heater 7 With flue gas formula air heater 8;It is sequentially arranged high temperature succi Nicotiana tabacum L. heat exchanger 5 and low temperature succi Nicotiana tabacum L. heat exchanger 6 in bypass flue 2, wherein, High temperature succi Nicotiana tabacum L. heat exchanger 5 is divided into the two sections of series connection, and water inlet a in the middle part of the setting of the junction of two sections, in hypomere The other end arranges end water inlet b, arranges outlet c in the other end of epimere;Its end water inlet b and No. 4 high-pressure extraction add The water inlet of hot device 9 is connected, and middle part water inlet a is connected with the water outlet of No. 1 high-pressure extraction heater 11 by valve 10, Setting service main road valve 12, service main road valve between the outlet c of middle part water inlet a and high temperature succi Nicotiana tabacum L. heat exchanger 5 Door 12 outlets are connected with the outlet c of economizer 3 water inlet and high temperature succi Nicotiana tabacum L. heat exchanger 5;Low temperature succi Nicotiana tabacum L. heat exchanger 6 enter water Mouth is connected with the water inlet of No. 7 low pressure bleeder heaters 13, and the outlet of low temperature succi Nicotiana tabacum L. heat exchanger 6 and No. 6 low pressure backheats heat The outlet of device 14 is connected;Oxygen-eliminating device 15 outlet passes through water inlet and the high temperature cigarette of feed pump 16 and No. 4 low pressure bleeder heaters The end water inlet b of water- to-water heat exchanger 5 is connected;Bled steam type air heater 7 enter vapourMouth No. 7 with steam turbine draws gasMouthful, Steam turbine No. 8 is drawn gasMouth and steam turbine No. 9 are drawn gasMouth is connected;The water outlet of bled steam type air heater 7Mouth is low with No. 7 Push back 13, No. 8 low pressure bleeder heaters of hot heater and No. 9 low pressure bleeder heaters the corresponding drain pipes that draw gasPhase Even;Flue gas formula air heater 8 is hydrophily formula heat exchanger, and its air side is arranged in the lower end of bled steam type air heater 7, flue gas Side is arranged in the converging in flue of boiler end.
The economizer variable area principle of variable area bootstrap system of the present invention is:
Under high loads, the valve 10 being connected with the middle part water inlet a of high temperature succi Nicotiana tabacum L. heat exchanger 5 is closed, service main road Valve 12 is opened, 11, No. 2 high-pressure heaters of No. 1 high-pressure heater of replacing whole of high temperature succi Nicotiana tabacum L. heat exchanger 5, No. 3 hyperbaric heatings Device and No. 4 high-pressure heater 9 heating feedwater, squeeze the high pressure extraction for backheat, feedwater is by No. 4 high-pressure heater water inlets 180 DEG C about be heated to 320 DEG C about of No. 1 high-pressure heater outlet, thus increasing steam turbine power;At low load, Service main road valve 12 valve closing, the valve 10 being connected with the middle part water inlet a of high temperature succi Nicotiana tabacum L. heat exchanger 5 is opened, high temperature The epimere of succi Nicotiana tabacum L. heat exchanger 5 does not squeeze regenerative steam, and the water of the hypomere water inlet b of high temperature succi Nicotiana tabacum L. heat exchanger is taken from No. 4 and high pushed back The water inlet of hot heater, hypomere is heated to No. 1 by feeding water by 160-180 DEG C about of No. 4 high-pressure extraction heater water inlets 260-290 DEG C of high-pressure extraction heater outlet about, the feedwater of No. 1 high-pressure heater outlet fully enters high temperature succi Nicotiana tabacum L. and changes The middle part water inlet a of hot device 5, enters epimere with the feedwater that hypomere is heated, feedwater is in epimere by 260-290 DEG C about after mixing It is warming up to 310-320 DEG C about, then enter economizer 3.All in all, at low load, high temperature succi Nicotiana tabacum L. heat exchanger hypomere replaces For high-pressure extraction heater (11, No. 2 high-pressure extraction heaters of No. 1 high-pressure extraction heater, No. 3 high-pressure extraction heaters and 4 Number high-pressure extraction heater) heating part feedwater, squeeze high-grade extracted steam from turbine, epimere is then equivalent to the economizer of series connection, Thus the total heating surface increasing economizer amasss.
As shown in figure 1, double reheat power generation sets economizer variable area bootstrap system is empty in air preheater and flue gas formula Be provided with bled steam type air heater between hot-air heater, in air preheat flow process, first with fume afterheat by air by Ambient temperature is promoted to 40-60 DEG C about, is then further heated up air to 90- using low-grade extracted steam from turbine heat 100 DEG C about, the air themperature of air preheater entrance is greatly improved so that the split ratio of flue gas increases in bypass flue, Produced by UTILIZATION OF VESIDUAL HEAT IN, energy-saving effect is greatly improved.
As shown in Fig. 2 the economizer of double reheat power generation sets economizer variable area bootstrap system not only can be arranged in In flue before back-end ductwork, it is also disposed in bypass flue so that the motility of system economizer design is greatly improved.
Present invention firstly provides high temperature succi Nicotiana tabacum L. heat exchanger is divided into two sections, reasonable adjusting valve switch is so that high temperature succi Nicotiana tabacum L. Heat exchanger can substitute under high loads and can substitute economizer under high-pressure extraction heater, underload simultaneously and add with high-pressure extraction Hot device, has reached the effect fully rationally utilizing fume afterheat, and has solved double reheat power generation sets economizer and be difficult to design arrangement Problem;Meanwhile, add present invention firstly provides arranging steam-extracting type air between air preheater and flue gas formula air heater Hot device, solves air preheater entering air temperature and is difficult to improve to more than 60 DEG C difficult problems so that the effect of UTILIZATION OF VESIDUAL HEAT IN is big Width improves, remarkable in economical benefits.

Claims (4)

1. a kind of double reheat power generation sets economizer variable area bootstrap system, this system mainly includes economizer, flue collector, side Road flue, air preheater, high temperature succi Nicotiana tabacum L. heat exchanger, low temperature succi Nicotiana tabacum L. heat exchanger, bleeder heater, bled steam type air heater with And flue gas formula air heater;It is characterized in that: boiler back end ductwork is separated into flue collector (1) and the bypass flue of parallel connection (2), economizer (3) is arranged in the flue before back-end ductwork or is arranged in bypass flue (2);Arrangement in flue collector (1) Air preheater (4), sets gradually bled steam type air heater (7) and flue gas formula air heater before air preheater (4) (8);It is sequentially arranged high temperature succi Nicotiana tabacum L. heat exchanger (5) and low temperature succi Nicotiana tabacum L. heat exchanger (6), wherein, high temperature succi Nicotiana tabacum L. changes in bypass flue (2) Hot device (5) is divided into the two sections of series connection, and water inlet (a) in the middle part of the setting of the junction of two sections, in the other end of hypomere Setting end water inlet (b), in other end setting outlet (c) of epimere;Its end water inlet (b) is added with No. 4 high-pressure extraction The water inlet of hot device (9) is connected, and the water outlet of valve (10) and No. 1 high-pressure extraction heater (11) is passed through at middle part water inlet (a) It is connected at mouthful, setting service main road valve between the outlet (c) of middle part water inlet (a) and high temperature succi Nicotiana tabacum L. heat exchanger (5) (12), the outlet (c) of service main road valve (12) outlet and economizer (3) water inlet and high temperature succi Nicotiana tabacum L. heat exchanger (5) It is connected;The water inlet of low temperature succi Nicotiana tabacum L. heat exchanger (6) is connected with the water inlet of No. 7 low pressure bleeder heaters (13), and low temperature succi Nicotiana tabacum L. changes The outlet of hot device (6) is connected with the outlet of No. 6 low pressure bleeder heaters (14);Oxygen-eliminating device (15) outlet passes through feed pump (16) it is connected with the water inlet of No. 4 low pressure bleeder heaters and end water inlet (b) of high temperature succi Nicotiana tabacum L. heat exchanger (5);Draw gas Formula air heater (7) enter vapourMouth No. 7 with steam turbine draws gasMouth, steam turbine No. 8 are drawn gasMouth and steam turbine No. 9 are taken out VapourMouth is connected;The water outlet of bled steam type air heater (7)Mouth and No. 7 low pressure bleeder heaters (13), No. 8 low pressure backheats Heater and No. 9 low pressure bleeder heaters the corresponding drain pipes that draw gasIt is connected;Flue gas formula air heater (8) is water Matchmaker's formula heat exchanger, its air side is arranged in the lower end of bled steam type air heater (7), and fume side is arranged in converging of boiler end In flue.
2. a kind of double reheat power generation sets economizer variable area bootstrap system according to claim 1 it is characterised in that The air intake of described bled steam type air heater (7) is drawn gas for No. 7 with steam turbineMouth, No. 8 extracted steam from turbines of steam turbineMouthful with And steam turbine No. 9 draws gasMouth connects, according to the different extracted steam from turbine extracting different extraction openings of load, the heating of steam-extracting type air Device (7) outlet and the corresponding aqueduct drawing gasIt is connected.
3. a kind of double reheat power generation sets economizer variable area bootstrap system according to claim 1 it is characterised in that In air heating procedure, cold air is tentatively heated first in flue gas formula air heater (8), then enters steam-extracting type empty Hot-air heater heats in (7) further, subsequently into air preheater (4).
4. the economizer variable area side of double reheat power generation sets economizer variable area bootstrap system described in a kind of claim 1 Method is it is characterised in that under high loads: the valve (10) being connected with middle part water inlet (a) of high temperature succi Nicotiana tabacum L. heat exchanger (5) is closed Close, service main road valve (12) is opened, No. 1 high-pressure extraction heater (11) of replacing whole of high temperature succi Nicotiana tabacum L. heat exchanger (5), 2 Number high-pressure extraction heater, No. 3 high-pressure extraction heaters and No. 4 high-pressure extraction heaters (9) heating feedwater, squeeze for backheat High pressure extraction, thus increasing steam turbine power;At low load, service main road valve (12) valve closing, with high temperature cigarette The valve (10) that middle part water inlet (a) of water- to-water heat exchanger (5) connects is opened, and the epimere of high temperature succi Nicotiana tabacum L. heat exchanger (5) does not squeeze back Heat is drawn gas, but for heating the boiler feedwater before the economizer (3) after backheat, the now epimere of high temperature succi Nicotiana tabacum L. heat exchanger (5) Be equivalent to the economizer of a series connection, thus the total heating surface increasing economizer amasss.
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