CN203298285U - Power station machine and furnace integrating type waste heat utilization system based on air preheated by extraction steam - Google Patents

Power station machine and furnace integrating type waste heat utilization system based on air preheated by extraction steam Download PDF

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Publication number
CN203298285U
CN203298285U CN2013203477935U CN201320347793U CN203298285U CN 203298285 U CN203298285 U CN 203298285U CN 2013203477935 U CN2013203477935 U CN 2013203477935U CN 201320347793 U CN201320347793 U CN 201320347793U CN 203298285 U CN203298285 U CN 203298285U
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China
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low
pressure heater
pressure
water
heater
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Expired - Fee Related
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CN2013203477935U
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Chinese (zh)
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徐钢
刘超
杨勇平
张昌顺
杨志平
黄圣伟
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North China Electric Power University
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North China Electric Power University
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Abstract

The utility model relates to a power station machine and furnace integrating type waste heat utilization system based on air preheated by extraction steam and belongs to the technical field of design of power station energy-saving equipment. The power station machine and furnace integrating type waste heat utilization system based on the air preheated by the extraction steam comprises a smoke distributing unit, a condensation water unit and a cold air preheating unit, wherein the smoke distributing unit comprises an air preheater, a first-level smoke-water heat exchanger, a second-level smoke-water heat exchanger and a dust remover, the condensation water unit comprises a high-pressure heater, a deaerator, a low-pressure heater, a water feeding pump, a condenser, a steam turbine high-pressure cylinder, a steam turbine intermediate-pressure cylinder, a steam turbine low-pressure cylinder and a steam turbine, and the cold air preheating unit comprises a first-level steam extraction condensation type air preheater and a second-level steam extraction condensation type air preheater. According to the power station machine and furnace integrating type waste heat utilization system based on the air preheated by the extraction steam, low-pressure extraction steam of the steam turbine is used for preheating the cold air so that higher-level extraction steam of the steam turbine can be saved, power generated by a unit can be obviously improved, energy waste caused by mismatching of energy levels is reduced due to the reasonable utilization and optimization design of energy in different levels, and then efficiency of energy utilization is improved.

Description

The integrated bootstrap system of power station machine stove based on the bled steam preheating air
Technical field
The utility model belongs to power station energy-saving equipment design field, relates in particular to the integrated bootstrap system of a kind of machine stove of power station based on the bled steam preheating air.
Background technology
The energy-saving and emission-reduction of large electric power plant unit are the important energy source strategies of China.Station boiler is as the first energy consumption equipment of China, and the annual approximately 1,500,000,000 tons of mark coals that consume, account for nearly 50% of national coal consumption total amount.And the SO of station boiler discharging 2, NO xAnd CO 2Account for respectively 45%, 42% and 48% left and right of national corresponding gross contamination emission.Although along with the development of green technology, the pollutant discharge amount of station boiler can descend to some extent; But in nearly mid-term, the various pollutant emissions of station boiler also will remain on higher level.Therefore, the energy-saving and emission-reduction research of actively developing station boiler is the important content of China's energy environment protection work.
At present, the thermal efficiency of large-sized station boiler is generally in the 90-94% left and right, and wherein heat loss due to exhaust gas accounts for the over half of whole heat loss, and exhaust gas heat loss's disalignment is contained huge residual heat resources.According to 120~140 ℃ of calculating of design exhaust gas temperature, the low-temperature flue gas waste heat stock number reaches 0.7 hundred million tons of mark coals.Adopt residual heat from boiler fume deep exploitation technology, as reclaim the fume afterheat of 50% left and right, can save 0.35 hundred million ton, mark coal every year, be equivalent to the year coal consumption of nearly 40 600MW thermal power generation units, or the annual electricity generating capacity of 2 pipe of reinforced concrete at Three Gorges Power Stations; By 800 yuan/tons of calculating of mark coal price lattice, 28,000,000,000 yuans of year saving fuel costs; The minimizing of waste heat discharging simultaneously, reduce environmental thermal pollution greatly, alleviates tropical island effect; And due to the energy-conservation SO that also can realize in flue gas xAnd NO x, Deng the reduction of discharging of pernicious gas, can realize CO 2Reduce discharging nearly 100,000,000 tons.In a word, the fume afterheat deep exploitation has energy-conservation, water saving, reduces CO 2Reach the comprehensive functions such as other noxious gas emission, have huge economic and social benefit, China's energy-saving and emission-reduction strategy is significant.
The utility model proposes the integrated bootstrap system of a kind of machine stove of power station based on the bled steam preheating air, broken through conventional UTILIZATION OF VESIDUAL HEAT IN mode, based on the principle of energy counterpart, cascade utilization, the waste heat energy that makes boiler smoke is effectively used with the form of optimum, remarkable in economical benefits.
Summary of the invention
The purpose of this utility model is, proposes the integrated bootstrap system of a kind of machine stove of power station based on the bled steam preheating air, is used for solving the problem that the present large-sized station boiler heat loss due to exhaust gas that uses can't effectively utilize.
To achieve these goals, the technical scheme that the utility model proposes is that the integrated bootstrap system of a kind of machine stove of power station based on the bled steam preheating air, is characterized in that described system comprises flue gas shunting unit, condensate water unit and cold air preheating unit;
Described flue gas shunting unit comprises air preheater 1, first order cigarette water-to-water heat exchanger 2, second level cigarette water-to-water heat exchanger 3 and deduster 4; Described air preheater 1 is connected with deduster 4, and described first order cigarette water-to-water heat exchanger 2, second level cigarette water-to-water heat exchanger 3 and deduster 4 orders are connected;
Described condensate water unit comprises the first high-pressure heater 8, the second high-pressure heater 9, third high pressure heater 10, oxygen-eliminating device 11, the first low-pressure heater 12, the second low-pressure heater 13, the 3rd low-pressure heater 14, the 4th low-pressure heater 15, condensate pump 16, condenser 17, steam turbine high-pressure cylinder 18, Steam Turbine Through IP Admission 19, turbine low pressure cylinder 20, feed pump 27 and feed pump small turbine 28;
Described the first high-pressure heater 8, the second high-pressure heater 9, third high press heater 10, feed pump 27, oxygen-eliminating device 11, the first low-pressure heater 12, the second low-pressure heater 13, the 3rd low-pressure heater 14, the 4th low-pressure heater 15, condensate pump 16 to be connected in turn with condenser 17;
Described steam turbine high-pressure cylinder 18, Steam Turbine Through IP Admission 19 and turbine low pressure cylinder 20 are connected in turn;
Described steam turbine high-pressure cylinder 18 is connected with the second high-pressure heater 9 with the first high-pressure heater 8 respectively;
Described Steam Turbine Through IP Admission 19 presses heater 10, oxygen-eliminating device 11 to be connected with feed pump small turbine 28 with third high respectively;
Described feed pump small turbine 28 is connected with feed pump 27;
The import of described first order cigarette water-to-water heat exchanger 2 is connected to third high by the first valve 21 and the second valve 22 and presses the both sides of heater 10, and the outlet of first order cigarette water-to-water heat exchanger 2 is connected to the both sides of the first high-pressure heater 8 by the 3rd valve 23 and the 4th valve 24;
The both sides of described the second high-pressure heater 9 are connected with the 3rd valve 23 with the second valve 22 respectively;
The import of described second level cigarette water-to-water heat exchanger 3 is connected with the first low-pressure heater 12 entrance sides by the 5th valve 25, and the outlet of second level cigarette water-to-water heat exchanger 3 is connected with the outlet side of the first low-pressure heater (12) by the 6th valve 26;
Described turbine low pressure cylinder 20 is connected with condenser 17 with the first low-pressure heater 12, the second low-pressure heater 13, the 3rd low-pressure heater 14, the 4th low-pressure heater 15 respectively;
Described cold air preheating unit comprises first order condensing air preheater 6 and the second level condensing air preheater 7 that draws gas that draws gas; Described first order condensing air preheater 6 and the second level condensing air preheater 7 that draws gas that draws gas is connected, and the described second level condensing air preheater 7 that draws gas is connected with air preheater 1;
The described first order draw gas condensing air preheater 6 be connected turbine low pressure cylinder 20 and be connected with the pipeline of the 3rd low-pressure heater 14;
The described second level draw gas condensing air preheater 7 be connected turbine low pressure cylinder 20 and be connected with the pipeline of the second low-pressure heater 13.
The integrated bootstrap system that the utility model provides, the utilization condensing air preheater that draws gas extracts the part steam turbine low-pressure and draws gas to the cold air preheating, saved thus and originally be used for the heat of the high-temperature flue gas of preheated air, reclaim again the condensate water of these high-grade fume afterheats heating higher energy level by being arranged on two-stage cigarette water-to-water heat exchanger in the bypass flue in parallel with air preheater, the extracted steam from turbine that squeezes higher level, go out merit thereby significantly increase unit.
Description of drawings
Fig. 1 is based on the integrated bootstrap system structure chart of power station machine stove of bled steam preheating air, in figure, the 1-air preheater, 2-first order cigarette water-to-water heat exchanger, 3-second level cigarette water-to-water heat exchanger, the 4-deduster, the 5-generator, the 6-first order condensing air preheater that draws gas, the 7-condensing air preheater that draws gas the second level, 8-the first high-pressure heater, 9-the second high-pressure heater, the 10-third high is pressed heater, the 11-oxygen-eliminating device, 12-the first low-pressure heater, 13-the second low-pressure heater, 14-the 3rd low-pressure heater, 15-the 4th low-pressure heater, the 16-condensate pump, the 17-condenser, the 18-steam turbine high-pressure cylinder, the 19-Steam Turbine Through IP Admission, the 20-turbine low pressure cylinder, 21-the first valve, 22-the second valve, 23-the 3rd valve, 24-the 4th valve, 25-the 5th valve, 26-the 6th valve, the 27-feed pump, 28-feed pump small turbine.
The specific embodiment
Below in conjunction with accompanying drawing, preferred embodiment is elaborated.Should be emphasized that, following explanation is only exemplary, rather than in order to limit scope of the present utility model and application thereof.
Fig. 1 is based on the integrated bootstrap system structure chart of power station machine stove of bled steam preheating air.As shown in Figure 1, the integrated bootstrap system of the machine stove of the power station based on the bled steam preheating air that the utility model provides, system comprises flue gas shunting unit, condensate water unit and cold air preheating unit.
The flue gas shunting unit comprises air preheater 1, first order cigarette water-to-water heat exchanger 2, second level cigarette water-to-water heat exchanger 3 and deduster 4.Air preheater 1 is connected with deduster 4, and first order cigarette water-to-water heat exchanger 2, second level cigarette water-to-water heat exchanger 3 and deduster 4 orders are connected.
The condensate water unit comprises the first high-pressure heater 8, the second high-pressure heater 9, third high pressure heater 10, oxygen-eliminating device 11, the first low-pressure heater 12, the second low-pressure heater 13, the 3rd low-pressure heater 14, the 4th low-pressure heater 15, condensate pump 16, condenser 17, steam turbine high-pressure cylinder 18, Steam Turbine Through IP Admission 19, turbine low pressure cylinder 20, feed pump 27 and feed pump small turbine 28.
The first high-pressure heater 8, the second high-pressure heater 9, third high press heater 10, feed pump 27, oxygen-eliminating device 11, the first low-pressure heater 12, the second low-pressure heater 13, the 3rd low-pressure heater 14, the 4th low-pressure heater 15, condensate pump 16 to be connected in turn with condenser 17.Steam turbine high-pressure cylinder 18, Steam Turbine Through IP Admission 19 and turbine low pressure cylinder 20 are connected in turn.
Steam turbine high-pressure cylinder 18 is connected with the second high-pressure heater 9 with the first high-pressure heater 8 respectively.Steam Turbine Through IP Admission 19 presses heater 10, oxygen-eliminating device 11 to be connected with feed pump small turbine 28 with third high respectively.Feed pump small turbine 28 is connected with feed pump 27.Oxygen-eliminating device is special hybrid bleeder heater, has deoxygenation concurrently, collects the effect of every Steam-water Flow, and its most important effect is to remove the oxygen that supplementing water is brought into, alleviates the corrosion that dissolved oxygen in feedwater causes heat power equipment and pipeline thereof.Feed pump 27 is used for improving feed pressure,, for feedwater provides power, makes feedwater enter boiler with elevated pressures.Feed pump small turbine 28 is used for driving feed pump 27, for it provides power.Feed pump small turbine 28 and feed pump 27 are the equipment in the conventional power plant therrmodynamic system.
The import of first order cigarette water-to-water heat exchanger 2 is connected to third high by the first valve 21 and the second valve 22 and presses the both sides of heater 10, and the outlet of first order cigarette water-to-water heat exchanger 2 is connected to the both sides of the first high-pressure heater 8 by the 3rd valve 23 and the 4th valve 24.The both sides of the second high-pressure heater 9 are connected with the 3rd valve 23 with the second valve 22 respectively.
The import of second level cigarette water-to-water heat exchanger 3 is connected with the first low-pressure heater 12 entrance sides by the 5th valve 25, and the outlet of second level cigarette water-to-water heat exchanger 3 is connected with the outlet side of the first low-pressure heater 12 by the 6th valve 26.
Turbine low pressure cylinder 20 is connected with condenser 17 with the first low-pressure heater 12, the second low-pressure heater 13, the 3rd low-pressure heater 14, the 4th low-pressure heater 15 respectively.
The cold air preheating unit comprises first order condensing air preheater 6 and the second level condensing air preheater 7 that draws gas that draws gas.First order condensing air preheater 6 and the second level condensing air preheater 7 that draws gas that draws gas is connected, and the second level condensing air preheater 7 that draws gas is connected with air preheater 1.
All by pipeline, be connected between above-mentioned interconnective parts.The first order draw gas condensing air preheater 6 be connected turbine low pressure cylinder 20 and be connected with the pipeline of the 3rd low-pressure heater 14, the second level draw gas condensing air preheater 7 be connected turbine low pressure cylinder 20 and be connected with the pipeline of the second low-pressure heater 13.
The operation principle of said structure is: the flue gas from boiler economizer 450-500 ℃ divides two-way, one tunnel enters air preheater 1, another road, successively by first order cigarette water-to-water heat exchanger 2 and second level cigarette water-to-water heat exchanger 3, through deduster 4 after is connected to desulfurizer after two-way converges subsequently through bypass flue.
In the conventional power plant therrmodynamic system, general adopt three grades of high-pressure heaters (8,9,10), one-level oxygen-eliminating device (11) and level Four low-pressure heater (12,13,14,15) to extract steam in steam turbine to be used for condensate water in heating system, this part steam just can not continue to do work again in steam turbine.
In the utility model, the high steam that station boiler produces driving steam turbine rotor in steam turbine high-pressure cylinder 18 rotates, and is the kinetic energy of rotor with the thermal power transfer of steam.Middle pressure steam finish merit in steam turbine high-pressure cylinder 18 after driving steam turbine rotor in Steam Turbine Through IP Admission 19 rotates, and is the kinetic energy of rotor with the thermal power transfer of steam.Steam finish merit in steam turbine high-pressure cylinder 18 and Steam Turbine Through IP Admission 19 after, the driving steam turbine rotor rotates in turbine low pressure cylinder 20, is the kinetic energy of rotor with the thermal power transfer of steam, then relies on generator 5 that the kinetic energy of rotor is converted to electric energy.After power conversion, steam enters condenser 17 and condenses by the economizer of entering after being heated by level Four low-pressure heater (15,14,13,12), one-level oxygen-eliminating device 11 and three grades of high-pressure heaters (10,9,8) successively after condensate pump 16.
the utility model is by the first valve 21, the second valve 22, the 3rd valve 23 and the 4th valve 24, control enters position and the flow thereof of the condensate water of first order cigarette water-to-water heat exchanger 2, can be with a part of condensate water of the heating of the heat in first order cigarette water-to-water heat exchanger 2 recovered flue gas, reduced by the first high-pressure heater 8, the second high-pressure heater 9 and third high are pressed the extracted steam from turbine amount of heater 10, the extracted steam from turbine that has namely squeezed higher level, be not enough to meet fully the purpose of heat-setting water because of the flue gas heat of first order cigarette water-to-water heat exchanger 2 recovery, therefore still need keep the high-pressure heater in conventional system in the utility model.
In like manner, by the 5th valve 25, control enters position and the flow thereof of the condensate water of second level cigarette water-to-water heat exchanger 3, can, with a part of condensate water of the heating of the heat in cigarette water-to-water heat exchanger 3 recovered flue gas of the second level, reduce the extracted steam from turbine amount of the first low-pressure heater 12.The 6th valve 26 is non-return valve, valve that namely can only one-way flow, this valve mainly makes by the part condensate water of second level cigarette water-to-water heat exchanger 3 heating can only flow to the main condensate pipeline from second level cigarette water-to-water heat exchanger 3, i.e. first order low-pressure heater 12 exits, and can not reverse flow.
First order condensing air preheater 6 and second level condensing air preheater 7 arranged in series of drawing gas of drawing gas, the first order pipeline that the steam of condensing air preheater 6 comes between turbine low pressure cylinder 20 and the 3rd low-pressure heater 14 that draws gas draws gas, and the second level pipeline that the steam of condensing air preheater 6 comes between turbine low pressure cylinder 20 and the second low-pressure heater 13 that draws gas draws gas.Draw gas after condensing air preheater 7 when draw gas by the first order successively condensing air preheater 6 and the second level of cold air, air is preheated, then enters air preheater 1, enters subsequently boiler furnace.
due to respect to low-pressure steam, high and medium voltage steam is larger in the acting ability of steam turbine, be that steam turbine high-pressure cylinder 8 and Steam Turbine Through IP Admission 9 actings are larger more, therefore the utility model adopts the waste heat in the first cigarette water-to-water heat exchanger 2 and second level cigarette water-to-water heat exchanger 3 recovered flue gas, to substitute steam turbine high-pressure cylinder and Steam Turbine Through IP Admission bled steam preheating condensate water, squeeze height, middle pressure is drawn gas and is entered the steam turbine acting, thereby make steam turbine high-pressure cylinder 8 and Steam Turbine Through IP Admission 9 can concentrate more heat to carry out power conversion, and then improved the operating efficiency of steam turbine high-pressure cylinder 8 and Steam Turbine Through IP Admission 9.But, utilized the heat of flue gas due to this process, therefore originally fume side is used for the just minimizing to some extent of heat of preheated air, so the utility model adopts again first order condensing air preheater 6 and the second level draw gas (this low-pressure pumping steam does work less in steam turbine) that condensing air preheater 7 extracts in turbine low pressure cylinders 20 of drawing gas of drawing gas to remove preheated air, has made up the shortage of heat of smoke pre-heating air.
The above; it is only the better specific embodiment of the utility model; but protection domain of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement, within all should being encompassed in protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.

Claims (1)

1. the integrated bootstrap system of the machine stove of the power station based on the bled steam preheating air, is characterized in that described system comprises flue gas shunting unit, condensate water unit and cold air preheating unit;
Described flue gas shunting unit comprises air preheater (1), first order cigarette water-to-water heat exchanger (2), second level cigarette water-to-water heat exchanger (3) and deduster (4); Described air preheater (1) is connected with deduster (4), and described first order cigarette water-to-water heat exchanger (2), second level cigarette water-to-water heat exchanger (3) and deduster (4) order are connected;
described condensate water unit comprises the first high-pressure heater (8), the second high-pressure heater (9), third high is pressed heater (10), oxygen-eliminating device (11), the first low-pressure heater (12), the second low-pressure heater (13), the 3rd low-pressure heater (14), the 4th low-pressure heater (15), condensate pump (16), condenser (17), steam turbine high-pressure cylinder (18), Steam Turbine Through IP Admission (19), turbine low pressure cylinder (20), feed pump (27) and feed pump small turbine (28),
Described the first high-pressure heater (8), the second high-pressure heater (9), third high press heater (10), feed pump (27), oxygen-eliminating device (11), the first low-pressure heater (12), the second low-pressure heater (13), the 3rd low-pressure heater (14), the 4th low-pressure heater (15), condensate pump (16) to be connected in turn with condenser (17);
Described steam turbine high-pressure cylinder (18), Steam Turbine Through IP Admission (19) and turbine low pressure cylinder (20) are connected in turn;
Described steam turbine high-pressure cylinder (18) is connected with the second high-pressure heater (9) with the first high-pressure heater (8) respectively;
Described Steam Turbine Through IP Admission (19) presses heater (10), oxygen-eliminating device (11) to be connected with feed pump small turbine (28) with third high respectively;
Described feed pump small turbine (28) is connected with feed pump (27);
The import of described first order cigarette water-to-water heat exchanger (2) is connected to third high by the first valve (21) and the second valve (22) and presses the both sides of heater (10), and the outlet of first order cigarette water-to-water heat exchanger (2) is connected to the both sides of the first high-pressure heater (8) by the 3rd valve (23) and the 4th valve (24);
The both sides of described the second high-pressure heater (9) are connected with the 3rd valve (23) with the second valve (22) respectively;
The import of described second level cigarette water-to-water heat exchanger (3) is connected with the first low-pressure heater (12) entrance side by the 5th valve (25), and the outlet of second level cigarette water-to-water heat exchanger (3) is connected with the outlet side of the first low-pressure heater (12) by the 6th valve (26);
Described turbine low pressure cylinder (20) is connected with the first low-pressure heater (12), the second low-pressure heater (13), the 3rd low-pressure heater (14), the 4th low-pressure heater (15) and condenser (17) respectively;
Described cold air preheating unit comprises first order condensing air preheater (6) and the second level condensing air preheater (7) that draws gas that draws gas; Described first order condensing air preheater (6) and the second level condensing air preheater (7) that draws gas that draws gas is connected, and the described second level condensing air preheater (7) that draws gas is connected with air preheater (1);
The described first order draw gas condensing air preheater (6) be connected turbine low pressure cylinder (20) and be connected with the pipeline of the 3rd low-pressure heater (14);
The described second level draw gas condensing air preheater (7) be connected turbine low pressure cylinder (20) and be connected with the pipeline of the second low-pressure heater (13).
CN2013203477935U 2013-06-18 2013-06-18 Power station machine and furnace integrating type waste heat utilization system based on air preheated by extraction steam Expired - Fee Related CN203298285U (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104534439A (en) * 2015-01-07 2015-04-22 西安热工研究院有限公司 System and method for indirectly heating air heater through extracted low-level steam in waste heat cascade utilization mode
CN105042564A (en) * 2015-08-13 2015-11-11 山东电力研究院 Low-pressure economizer connection system and method
CN105371267A (en) * 2015-12-16 2016-03-02 广州粤能电力科技开发有限公司 Double-reheat steam turbine heat regenerative energy utilizing system for primary air and secondary air of heating boiler
CN105401987A (en) * 2015-12-08 2016-03-16 广州粤能电力科技开发有限公司 Steam-extraction superheat utilization system for double-reheat stream turbine for heating boiler secondary air
CN106382619A (en) * 2016-11-09 2017-02-08 北京京诚科林环保科技有限公司 Deep recycling system for gas-fired boiler flue gas waste heat
CN112594019A (en) * 2020-12-13 2021-04-02 东北电力大学 Energy cascade efficient utilization system of supercritical coal-fired generator set

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104534439A (en) * 2015-01-07 2015-04-22 西安热工研究院有限公司 System and method for indirectly heating air heater through extracted low-level steam in waste heat cascade utilization mode
CN105042564A (en) * 2015-08-13 2015-11-11 山东电力研究院 Low-pressure economizer connection system and method
CN105401987A (en) * 2015-12-08 2016-03-16 广州粤能电力科技开发有限公司 Steam-extraction superheat utilization system for double-reheat stream turbine for heating boiler secondary air
CN105371267A (en) * 2015-12-16 2016-03-02 广州粤能电力科技开发有限公司 Double-reheat steam turbine heat regenerative energy utilizing system for primary air and secondary air of heating boiler
CN105371267B (en) * 2015-12-16 2018-07-03 广州粤能电力科技开发有限公司 The Double reheat steam turbine backheat energy utility system of heating boiler primary and secondary air
CN106382619A (en) * 2016-11-09 2017-02-08 北京京诚科林环保科技有限公司 Deep recycling system for gas-fired boiler flue gas waste heat
CN112594019A (en) * 2020-12-13 2021-04-02 东北电力大学 Energy cascade efficient utilization system of supercritical coal-fired generator set
CN112594019B (en) * 2020-12-13 2022-11-25 东北电力大学 Energy cascade efficient utilization system of supercritical coal-fired generator set

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