CN204717665U - A kind of double reheat power generation sets economizer variable area bootstrap system - Google Patents
A kind of double reheat power generation sets economizer variable area bootstrap system Download PDFInfo
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- CN204717665U CN204717665U CN201520248003.7U CN201520248003U CN204717665U CN 204717665 U CN204717665 U CN 204717665U CN 201520248003 U CN201520248003 U CN 201520248003U CN 204717665 U CN204717665 U CN 204717665U
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Abstract
The utility model discloses a kind of double reheat power generation sets economizer variable area bootstrap system belonging to power station energy-saving field, this system mainly comprises economizer, flue collector, bypass flue, air preheater, high temperature cigarette water-to-water heat exchanger, low temperature cigarette water-to-water heat exchanger, high and low pressure bleeder heater, bled steam type air heater and flue gas formula air heater.Adopt flue gas formula air heater and bled steam type air heater arranged in series, preheating cold air; Double reheat power generation sets economizer variable area bootstrap system utilizes low-temperature flue gas waste heat and steam turbine low-pressure to draw gas to add hot-air; Displace high-grade flue gas heat, be used for heated feed water and condensate water under high loads, exclusion is used for the high pressure extraction of backheat; At low load, high temperature cigarette water-to-water heat exchanger leading portion does not squeeze regenerative steam, but for the boiler feedwater after heating bleeder heater, before economizer, saves coal-fired, and the degree of depth realizing Thermal generation unit is saved energy and reduce the cost, remarkable in economical benefits.
Description
Technical field
The utility model belongs to power station energy-saving field, particularly a kind of double reheat power generation sets economizer variable area bootstrap system.
Background technology
The energy-saving and emission-reduction of Large-scale fire-electricity unit are the important energy source strategies of China.For adapting to the fast development of electricity market and the immense pressure of energy-saving and emission-reduction, the operational efficiency of raising heat power equipment, development of latent energy-saving potential have become the problem of each power plant pay attention to day by day.
In recent years in order to improve efficiency of plant, China greatly develops double reheat power generation sets, current China has multiple double reheat power generation sets and is building, can realize in a short time going into operation and run, but, double reheat power generation sets still has certain energy-saving potential, be set up at the cloth of back-end surfaces simultaneously and there are some problems, first, advanced therrmodynamic system causes the boiler inlet water temperature of double reheat power generation sets higher, enters stove air capacity lower, at boiler tail, the caloric receptivity of water and air is less, and therefore exhaust gas temperature is higher, causes very large energy dissipation; Secondly, double reheat power generation sets under full capacity, economizer inlet water temperature is higher, heat exchange amount and the required heat exchange area of economizer are less, but when underload, economizer inlet water temperature is lower, need larger heat exchange area, if therefore consider variable working condition, the economizer of double reheat power generation sets is difficult to design and arranges.
The utility model proposes a kind of double reheat power generation sets economizer variable area bootstrap system, solve the deficiency of above-mentioned technology, its core design thought is: by high temperature cigarette water-to-water heat exchanger is divided into two sections, two water inlets are set, Rational choice draws water position a little, and by the switch control rule of valve, make high temperature cigarette water-to-water heat exchanger condensate water in heating high-pressure heater under high loads, exclusion steam turbine high-grade is drawn gas, not only squeeze extracted steam from turbine at low load, also play the effect of part economizer; Meanwhile, double reheat power generation sets economizer variable area bootstrap system utilizes flue gas formula air heater to reduce exhaust gas temperature, bled steam type air heater is set after flue gas formula air heater simultaneously, improves further into stove air themperature, displaced a large amount of high-grade fume afterheats.Double reheat power generation sets economizer variable area bootstrap system adequately achieves energy counterpart, cascade utilization, significantly improve unit efficiency, solve the problem that double reheat power generation sets economizer is difficult to design arrangement, be an energy-saving and emission-reduction new technology being applicable to double reheat power station simultaneously.
Utility model content
The purpose of this utility model is the deficiency existed for prior art, propose a kind of double reheat power generation sets economizer variable area bootstrap system, this system mainly comprises economizer, flue collector, bypass flue, air preheater, high temperature cigarette water-to-water heat exchanger, low temperature cigarette water-to-water 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 in parallel and bypass flue 2, in economizer 3 or the flue before being arranged in back-end ductwork, or be arranged in bypass flue 2; Arrange air preheater 4 in flue collector 1, before air preheater 4, set gradually bled steam type air heater 7 and flue gas formula air heater 8; High temperature cigarette water-to-water heat exchanger 5 and low temperature cigarette water-to-water heat exchanger 6 is arranged successively in bypass flue 2, wherein, high temperature cigarette water-to-water heat exchanger 5 is divided into the two sections of series connection, middle part water inlet a is set in the junction of two sections, end water inlet b is set at the other end of hypomere, sets out mouth of a river c at the other end of epimere; Its end water inlet b is connected with the water inlet of No. 4 high-pressure extraction heaters 9, middle part water inlet a is connected with the water outlet of No. 1 high-pressure extraction heater 11 by valve 10, between middle part water inlet a and the delivery port c of high temperature cigarette water-to-water heat exchanger 5, arrange feedwater main pipeline valve 12, service main road valve 12 delivery port is connected with the delivery port c of economizer 3 water inlet with high temperature cigarette water-to-water heat exchanger 5; The water inlet of low temperature cigarette water-to-water heat exchanger 6 is connected with the water inlet of No. 7 low pressure bleeder heaters 13, and the delivery port of low temperature cigarette water-to-water heat exchanger 6 is connected with the outlet of No. 6 low pressure bleeder heaters 14; Oxygen-eliminating device 15 delivery port is connected with the end water inlet b of high temperature cigarette water-to-water heat exchanger 5 with the water inlet of No. 4 low pressure bleeder heaters by feed pump 16; The admission of bled steam type air heater 7
mouth and No. 7, steam turbine draw gas
mouth, No. 8, steam turbine draw gas
mouth and No. 9, steam turbine draw gas
mouth is connected; The water outlet of bled steam type air heater 7
mouthful with No. 7 low pressure bleeder heaters 13, No. 8 low pressure bleeder heaters with the corresponding drain pipe that draws gas of No. 9 low pressure bleeder heaters
be connected; 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, and fume side is arranged in converging in flue of boiler end.
Air intake and No. 7, the steam turbine of described bled steam type air heater 7 draw gas
mouth, steam turbine No. 8 extracted steam from turbines
mouth and No. 9, steam turbine draw gas
mouth connects, and extracts extracted steam from turbine, bled steam type air heater 7 delivery port and the corresponding aqueduct drawn gas of different extraction opening according to load difference
be connected.
In described air heat flow process, first cold air is tentatively heated in flue gas formula air heater 8, then enters heating further in bled steam type air heater 7, then enters air preheater (4);
The economizer variable area method of described double reheat power generation sets economizer variable area bootstrap system:
Under high loads, the valve 10 be connected with the middle part water inlet a of high temperature cigarette water-to-water heat exchanger 5 is closed, service main road valve 10 is opened, replacing whole No. 1 high-pressure extraction heater 11, No. 2 high-pressure extraction heaters of high temperature cigarette water-to-water heat exchanger 5, No. 3 high-pressure extraction heaters and No. 4 high-pressure extraction heater 9 heated feed waters, exclusion is used for the high pressure extraction of backheat, thus increases steam turbine power; At low load, service main road valve 12 valve closing, the valve 10 be connected with the middle part water inlet a of high temperature cigarette water-to-water heat exchanger 5 is opened, the epimere of high temperature cigarette water-to-water heat exchanger 5 does not squeeze regenerative steam, but for heating the boiler feedwater before the economizer after backheat 3, now the epimere of high temperature cigarette water-to-water 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 described in the utility model has following features:
1. high temperature cigarette water-to-water heat exchanger is divided into two sections, arranges two water inlets at middle part and end, Rational choice water inlet draws water position a little, under different load, is regulated by the open and close of valve.Under high load capacity, two sections are all used for the feedwater of alternative high-pressure heater heating part, and exclusion is used for the high pressure extraction of backheat, thus increases steam turbine power; At low load, epimere porch valve open, service main road place valve closing, hypomere substitutes high-pressure heater heated feed water, exclusion high-grade extracted steam from turbine, and the whole feedwater before epimere heating economizer entrance, play the effect of part economizer; Reach the effect of abundant Appropriate application fume afterheat, and solve the problem 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 are set before air preheater, flue gas formula air heater can effectively reduce cigarette temperature, improve boiler efficiency, bled steam type air heater then achieves the effect improving air themperature further, the air themperature of air preheater entrance can be promoted to about 100 DEG C.
3. this system opening flexibly, according to the difference of unit parameter and load, can extract the extracted steam from turbine of diverse location to add hot-air.
4. this system opening flexibly, according to factors such as station boiler form and design arrangement, economizer both can be arranged in back-end ductwork before flue in, also can be arranged in bypass flue.
Accompanying drawing explanation
Fig. 1 is double reheat power generation sets economizer variable area bootstrap system schematic diagram.
Fig. 2 is the double reheat power generation sets economizer variable area bootstrap system schematic diagram that economizer is arranged in bypass flue.
Detailed description of the invention
The utility model proposes a kind of double reheat power generation sets economizer variable area bootstrap system.Be explained below in conjunction with accompanying drawing and example.
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 comprises economizer, flue collector, bypass flue, air preheater, high temperature cigarette water-to-water heat exchanger, low temperature cigarette water-to-water heat exchanger, bleeder heater, bled steam type air heater and flue gas formula air heater; Boiler back end ductwork is separated into flue collector 1 in parallel and bypass flue 2, in economizer 3 or the flue before being arranged in back-end ductwork, or is arranged in bypass flue 2; Arrange air preheater 4 in flue collector 1, before air preheater 4, set gradually bled steam type air heater 7 and flue gas formula air heater 8; High temperature cigarette water-to-water heat exchanger 5 and low temperature cigarette water-to-water heat exchanger 6 is arranged successively in bypass flue 2, wherein, high temperature cigarette water-to-water heat exchanger 5 is divided into the two sections of series connection, middle part water inlet a is set in the junction of two sections, end water inlet b is set at the other end of hypomere, sets out mouth of a river c at the other end of epimere; Its end water inlet b is connected with the water inlet of No. 4 high-pressure extraction heaters 9, middle part water inlet a is connected with the water outlet of No. 1 high-pressure extraction heater 11 by valve 10, between middle part water inlet a and the delivery port c of high temperature cigarette water-to-water heat exchanger 5, arrange feedwater main pipeline valve 12, service main road valve 12 delivery port is connected with the delivery port c of economizer 3 water inlet with high temperature cigarette water-to-water heat exchanger 5; The water inlet of low temperature cigarette water-to-water heat exchanger 6 is connected with the water inlet of No. 7 low pressure bleeder heaters 13, and the delivery port of low temperature cigarette water-to-water heat exchanger 6 is connected with the outlet of No. 6 low pressure bleeder heaters 14; Oxygen-eliminating device 15 delivery port is connected with the end water inlet b of high temperature cigarette water-to-water heat exchanger 5 with the water inlet of No. 4 low pressure bleeder heaters by feed pump 16; The admission of bled steam type air heater 7
mouth and No. 7, steam turbine draw gas
mouth, No. 8, steam turbine draw gas
mouth and No. 9, steam turbine draw gas
mouth is connected; The water outlet of bled steam type air heater 7
mouthful with No. 7 low pressure bleeder heaters 13, No. 8 low pressure bleeder heaters with the corresponding drain pipe that draws gas of No. 9 low pressure bleeder heaters
be connected; 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, and fume side is arranged in converging in flue of boiler end.
The economizer variable area principle of the utility model variable area bootstrap system is:
Under high loads, the valve 10 be connected with the middle part water inlet a of high temperature cigarette water-to-water heat exchanger 5 is closed, service main road valve 12 is opened, replacing whole No. 1 high-pressure heater 11, No. 2 high-pressure heaters of high temperature cigarette water-to-water heat exchanger 5, No. 3 high-pressure heaters and No. 4 high-pressure heater 9 heated feed waters, exclusion is used for the high pressure extraction of backheat, feed water and to be heated to about 320 DEG C of No. 1 high-pressure heater delivery port by about 180 DEG C of No. 4 high-pressure heater water inlets, thus increase steam turbine power, at low load, service main road valve 12 valve closing, the valve 10 be connected with the middle part water inlet a of high temperature cigarette water-to-water heat exchanger 5 is opened, the epimere of high temperature cigarette water-to-water heat exchanger 5 does not squeeze regenerative steam, the water of the hypomere water inlet b of high temperature cigarette water-to-water heat exchanger takes from the water inlet of No. 4 high-pressure extraction heaters, feedwater is heated to about 260-290 DEG C of No. 1 high-pressure extraction heater outlet by hypomere by about 160-180 DEG C of No. 4 high-pressure extraction heater water inlets, the feedwater of No. 1 high-pressure heater delivery port all enters the middle part water inlet a of high temperature cigarette water-to-water heat exchanger 5, epimere is entered after mixing with the feedwater that hypomere heats, feedwater is warming up to about 310-320 DEG C at epimere by about 260-290 DEG C, then enter economizer 3.All in all, at low load, high temperature cigarette water-to-water heat exchanger hypomere instead of the feedwater of high-pressure extraction heater (No. 1 high-pressure extraction heater 11, No. 2 high-pressure extraction heaters, No. 3 high-pressure extraction heaters and No. 4 high-pressure extraction heaters) heating part, exclusion high-grade extracted steam from turbine, epimere is then equivalent to the economizer of connecting, thus the total heating surface increasing economizer amasss.
As shown in Figure 1, double reheat power generation sets economizer variable area bootstrap system is provided with bled steam type air heater between air preheater and flue gas formula air heater, in air preheat flow process, first utilize fume afterheat that air is promoted to about 40-60 DEG C by environment temperature, then utilize low-grade extracted steam from turbine heat that air is warming up to about 90-100 DEG C further, significantly improve the air themperature of air preheater entrance, the split ratio of flue gas in bypass flue is increased, and the energy-saving effect that UTILIZATION OF VESIDUAL HEAT IN produces significantly improves.
As shown in Figure 2, the economizer of double reheat power generation sets economizer variable area bootstrap system not only can be arranged in back-end ductwork before flue in, also can be arranged in bypass flue, the flexibility that system economizer is designed significantly improves.
The utility model proposes high temperature cigarette water-to-water heat exchanger to be divided into two sections first, reasonable adjusting valve switch, make high temperature cigarette water-to-water heat exchanger can substitute high-pressure extraction heater under high loads, economizer and high-pressure extraction heater can be substituted under underload simultaneously, reach the effect of abundant Appropriate application fume afterheat, and solve the problem that double reheat power generation sets economizer is difficult to design arrangement; Simultaneously, the present invention proposes to arrange bled steam type air heater first between air preheater and flue gas formula air heater, solve air preheater entering air temperature to be difficult to be increased to more than 60 DEG C difficult problems, the effect of UTILIZATION OF VESIDUAL HEAT IN is significantly improved, remarkable in economical benefits.
Claims (3)
1. a double reheat power generation sets economizer variable area bootstrap system, this system mainly comprises economizer, flue collector, bypass flue, air preheater, high temperature cigarette water-to-water heat exchanger, low temperature cigarette water-to-water heat exchanger, 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) in parallel and bypass flue (2), in economizer (3) or the flue before being arranged in back-end ductwork, or be arranged in bypass flue (2); Arrange air preheater (4) in flue collector (1), air preheater (4) is front sets gradually bled steam type air heater (7) and flue gas formula air heater (8); High temperature cigarette water-to-water heat exchanger (5) and low temperature cigarette water-to-water heat exchanger (6) is arranged successively in bypass flue (2), wherein, high temperature cigarette water-to-water heat exchanger (5) is divided into the two sections of series connection, middle part water inlet (a) is set in the junction of two sections, end water inlet (b) is set at the other end of hypomere, sets out the mouth of a river (c) at the other end of epimere; Its end water inlet (b) is connected with the water inlet of No. 4 high-pressure extraction heaters (9), middle part water inlet (a) is connected by the water outlet of valve (10) with No. 1 high-pressure extraction heater (11), between middle part water inlet (a) and the delivery port (c) of high temperature cigarette water-to-water heat exchanger (5), arrange feedwater main pipeline valve (12), service main road valve (12) delivery port is connected with the delivery port (c) of economizer (3) water inlet with high temperature cigarette water-to-water heat exchanger (5); The water inlet of low temperature cigarette water-to-water heat exchanger (6) is connected with the water inlet of No. 7 low pressure bleeder heaters (13), and the delivery port of low temperature cigarette water-to-water heat exchanger (6) is connected with the outlet of No. 6 low pressure bleeder heaters (14); Oxygen-eliminating device (15) delivery port is connected with end water inlet (b) of high temperature cigarette water-to-water heat exchanger (5) with the water inlet of No. 4 low pressure bleeder heaters by feed pump (16); The admission of bled steam type air heater (7)
mouth and No. 7, steam turbine draw gas
mouth, No. 8, steam turbine draw gas
mouth and No. 9, steam turbine draw gas
mouth is connected; The water outlet of bled steam type air heater (7)
mouthful with No. 7 low pressure bleeder heaters (13), No. 8 low pressure bleeder heaters with the corresponding drain pipe that draws gas of No. 9 low pressure bleeder heaters
be connected; 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), and fume side is arranged in converging in flue of boiler end.
2. a kind of double reheat power generation sets economizer variable area bootstrap system according to claim 1, is characterized in that, air intake and No. 7, the steam turbine of described bled steam type air heater (7) draw gas
mouth, steam turbine No. 8 extracted steam from turbines
mouth and No. 9, steam turbine draw gas
mouth connects, and extracts extracted steam from turbine, bled steam type air heater (7) delivery port and the corresponding aqueduct drawn gas of different extraction opening according to load difference
be connected.
3. a kind of double reheat power generation sets economizer variable area bootstrap system according to claim 1, it is characterized in that, in air heat flow process, first cold air is tentatively heated in flue gas formula air heater (8), then enter heating further in bled steam type air heater (7), then enter air preheater (4).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949101A (en) * | 2015-04-22 | 2015-09-30 | 华北电力大学 | Secondary reheat unit economizer variable-area waste heat utilizing system |
| CN108730951A (en) * | 2018-07-25 | 2018-11-02 | 西安热工研究院有限公司 | It is a kind of to utilize high pressure low temperature economizer auxiliary frequency modulation peak regulation system and method |
-
2015
- 2015-04-22 CN CN201520248003.7U patent/CN204717665U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949101A (en) * | 2015-04-22 | 2015-09-30 | 华北电力大学 | Secondary reheat unit economizer variable-area waste heat utilizing system |
| CN104949101B (en) * | 2015-04-22 | 2017-01-18 | 华北电力大学 | Secondary reheat unit economizer variable-area waste heat utilizing system |
| CN108730951A (en) * | 2018-07-25 | 2018-11-02 | 西安热工研究院有限公司 | It is a kind of to utilize high pressure low temperature economizer auxiliary frequency modulation peak regulation system and method |
| CN108730951B (en) * | 2018-07-25 | 2024-01-23 | 西安热工研究院有限公司 | Auxiliary frequency modulation and peak shaving system and method by using high-pressure low-temperature economizer |
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