CN211650196U - Steam-driven water-feeding pump small-machine exhaust waste heat recycling device - Google Patents

Steam-driven water-feeding pump small-machine exhaust waste heat recycling device Download PDF

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Publication number
CN211650196U
CN211650196U CN202020164800.8U CN202020164800U CN211650196U CN 211650196 U CN211650196 U CN 211650196U CN 202020164800 U CN202020164800 U CN 202020164800U CN 211650196 U CN211650196 U CN 211650196U
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steam
heat exchanger
outlet
small
water
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CN202020164800.8U
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王林
王红雨
高景辉
张亚夫
孟颖琪
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Xian Thermal Power Research Institute Co Ltd
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Xian Thermal Power Research Institute Co Ltd
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Abstract

The utility model discloses a little quick-witted exhaust waste heat recovery utilizes device of steam-feed pump, including demineralized water input pipeline, little quick-witted condenser, circulating pump, air preheater export low temperature economizer, condensate water heat exchanger, heat exchanger bypass, air heater, overgrate air heater, condensate water pipeline, No. seven low pressure feed water heaters, No. six low pressure feed water heaters and No. five low pressure feed water heaters, the device can utilize the little quick-witted exhaust waste heat heating boiler's of feed pump air heater and overgrate air and unit condensate water.

Description

Steam-driven water-feeding pump small-machine exhaust waste heat recycling device
Technical Field
The utility model relates to a waste heat recovery utilizes device, concretely relates to little quick-witted exhaust waste heat recovery utilizes device of steam feed pump.
Background
The feed pump is the most powerful equipment of thermal power unit. In recent years, in order to reduce the plant power consumption, the scheme that an electric water feeding pump is abandoned in a coal-fired power plant is changed into a scheme that a small steam turbine is adopted to drive a draught fan, and the measure has a good effect on reducing the plant power consumption. The small turbine driving the feed pump is called the small machine of the feed pump for short, while the large turbine driving the generator in the thermal power plant is called the large machine for short. Usually, the feed pump units have their own independent condensers. The condenser has the following functions: water (called circulating water) is used as a cooling working medium, and is directly or indirectly contacted with steam discharged by a steam turbine to condense the steam into water (called condensed water), and heat is taken away by the circulating water.
The circulating water for cooling the steam discharged by the small machine of the feed water pump is usually branched from a circulating water pipeline of the large machine. The condensed water obtained by condensing the discharged steam of the small machine of the feed pump is generally conveyed to a condenser of the large machine by a water pump and is mixed with the condensed water of the large machine.
The low-temperature economizer is a common device for reducing smoke discharge loss and recovering waste heat of smoke in a coal-fired power plant, and is essentially a smoke-water heat exchanger. The low-temperature economizer mainly comprises a plurality of groups of heating surface tube bundles. When the flue gas flows through the flue gas heat absorption device, cold water in the pipe bundle absorbs heat of the flue gas, so that the temperature of the flue gas is reduced, and the temperature of the flue gas is increased. The structure of the low-temperature economizer is shown in the above figure.
In order to prevent the cold end of the air preheater from low-temperature corrosion (namely acid liquor corrosion), a primary air heater and a secondary air heater are often required to be installed in a power plant, so that the comprehensive temperature of the cold end is increased, and the condensation of sulfuric acid vapor in flue gas on a cold end heat exchange element is reduced. The air heater is composed of a plurality of groups of tube bundles, and utilizes steam or hot water as a heat source to heat primary air and secondary air (air) flowing through the tubes.
The steam discharged from the small water supply pump carries high heat, and the heat is taken away by circulating water, and is generally subjected to direct or indirect heat exchange with air in a cooling tower and is lost in the atmosphere. If the waste heat of the exhaust steam of the small machine of the feed water pump is recycled, the heat of the flue gas at the inlet and the outlet of the air preheater is synchronously recycled, and the heat is used for heating the primary air and the secondary air of the boiler and the condensed water of the unit, so that the overall energy-saving level of the unit is obviously improved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a little quick-witted exhaust waste heat recovery of steam feed pump utilizes the device, the device can utilize the little quick-witted exhaust waste heat heating boiler's of feed pump wind and overgrate air and unit condensate water.
In order to achieve the purpose, the small-machine exhaust steam waste heat recycling device of the steam-driven water-feeding pump comprises a desalted water input pipeline, a small-machine condenser, a circulating pump, an air preheater outlet low-temperature economizer, a condensed water heat exchanger, a heat exchanger bypass, a primary air heater, a secondary air heater, a condensed water pipeline, a seventh low-pressure heater, a sixth low-pressure heater and a fifth low-pressure heater;
the desalted water input pipeline and the outlets of the small condenser are communicated with the inlet of a circulating pump, the outlet of the circulating pump is divided into two paths after passing through a low-temperature economizer at the outlet of an air preheater, wherein one path is communicated with the heat release side inlet of a condensed water heat exchanger, the other path is communicated with the inlet of a heat exchanger bypass, and the heat release side outlet of the condensed water heat exchanger and the outlet of the heat exchanger bypass are communicated with the inlet of the small condenser through a primary air heater and a secondary air heater in sequence after being connected with each other through pipelines and pipes;
the outlet of the condensed water pipeline is divided into two paths after passing through a seventh low-pressure heater, wherein one path is communicated with the heat absorption side inlet of the condensed water heat exchanger, the other path is communicated with the inlet of a sixth low-pressure heater, and the heat absorption side outlet of the condensed water heat exchanger and the outlet of the sixth low-pressure heater are both communicated with the inlet of a fifth low-pressure heater.
The bypass valve is arranged on the bypass of the heat exchanger.
The entrance of the circulating pump is provided with a circulating pump inlet door, and the exit of the circulating pump is provided with a circulating pump outlet door.
The demineralized water input pipeline is provided with a demineralized water valve.
An inlet door is arranged at the heat absorption side inlet of the condensed water heat exchanger, and an outlet door is arranged at the heat absorption side outlet of the condensed water heat exchanger.
The steam turbine also comprises a small turbine steam exhaust pipeline, wherein the small turbine steam exhaust pipeline is communicated with a steam inlet of the small turbine condenser.
The utility model discloses following beneficial effect has:
steam-feed pump miniengine steam extraction waste heat recovery utilizes device when concrete operation, adopt condenser + low temperature economizer + condensate water heat exchanger + hot-water air heater combination formula design, the heat of retrieving is used for heating condensate water, air and overgrate air, does not additionally consume the energy, is showing and is reducing the unit coal consumption, promotes unit efficiency. Specifically, demineralized water is heated through a small condenser and a low-temperature economizer at the outlet of an air preheater, and then high-temperature demineralized water is used for heating condensed water, primary air and secondary air, so that the purpose of heating the primary air and the secondary air of the boiler and the condensed water of the unit by using the exhaust waste heat of the small unit of the feed pump is realized. In addition, need explain, the utility model discloses well low temperature economizer, primary air fan heater and overgrate air fan heater are all arranged around the air preheater, and condensate heat exchanger, condenser are arranged around the steam-operated feed pump, and the pipeline is short, and the overall arrangement is compact, saves tubular product, reduces the on-the-way resistance, guarantees good circulation effect.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
The system comprises a desalting water valve 1, a circulating pump inlet door 2, a circulating pump 3, a circulating pump outlet door 4, an air preheater outlet low-temperature economizer 5, a seventh low-pressure heater 6, an inlet door 7, a sixth low-pressure heater 8, a condensed water heat exchanger 9, an outlet door 10, a fifth low-pressure heater 11, a primary air heater 12, a secondary air heater 13, a bypass valve 14 and a small condenser 15.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the steam-driven water-feeding pump small-machine exhaust steam waste heat recycling device of the present invention includes a demineralized water input pipeline, a small-machine condenser 15, a circulating pump 3, an air preheater outlet low-temperature economizer 5, a condensed water heat exchanger 9, a heat exchanger bypass, a primary air heater 12, a secondary air heater 13, a condensed water pipeline, a seventh low-pressure heater 6, a sixth low-pressure heater 8 and a fifth low-pressure heater 11; the desalted water input pipeline and the outlet of the small condenser 15 are communicated with the inlet of the circulating pump 3, the outlet of the circulating pump 3 is divided into two paths after passing through the low-temperature economizer 5 at the outlet of the air preheater, wherein one path is communicated with the heat release side inlet of the condensed water heat exchanger 9, the other path is communicated with the inlet of the heat exchanger bypass, and the heat release side outlet of the condensed water heat exchanger 9 and the outlet of the heat exchanger bypass are communicated with the inlet of the small condenser 15 through a primary air heater 12 and a secondary air heater 13 in sequence after being connected in parallel through pipelines; the outlet of the condensed water pipeline is divided into two paths after passing through a No. seven low-pressure heater 6, wherein one path is communicated with the heat absorption side inlet of a condensed water heat exchanger 9, the other path is communicated with the inlet of a No. six low-pressure heater 8, and the heat absorption side outlet of the condensed water heat exchanger 9 and the outlet of the No. six low-pressure heater 8 are both communicated with the inlet of a No. five low-pressure heater 11. The utility model discloses still include the little quick-witted exhaust steam pipe way, wherein, little quick-witted exhaust steam pipe way is linked together with little quick-witted condenser 15's steam inlet.
A bypass valve 14 is arranged on the heat exchanger bypass; a circulating pump inlet door 2 is arranged at the inlet of the circulating pump 3, and a circulating pump outlet door 4 is arranged at the outlet of the circulating pump 3; a demineralized water valve 1 is arranged on the demineralized water input pipeline; an inlet door 7 is arranged at the heat absorption side inlet of the condensed water heat exchanger 9, and an outlet door 10 is arranged at the heat absorption side outlet of the condensed water heat exchanger 9.
The utility model discloses utilize the demineralized water to carry out closed circulation for the working medium, circulation power comes from circulating pump 3's drive, when preparing to throw the usefulness, pours into the demineralized water into earlier, opens demineralized water valve 1 this moment, and the demineralized water gets into in the system, treats to be filled with the demineralized water in the system after, opens circulating pump entry door 2, starts circulating pump 3, opens circulating pump export door 4, and the demineralized water begins to circulate in the system.
The desalted water firstly enters the small-sized condenser 15 and exchanges heat with steam discharged by the small-sized condenser, the discharged steam of the small-sized condenser is cooled and condensed into condensed water, the desalted water absorbs the waste heat of the discharged steam, and the water temperature rises.
The desalted water is pressurized by a circulating pump 3 and then flows through an air preheater outlet low-temperature economizer 5, the desalted water is heated by high-temperature flue gas, so that the smoke temperature is reduced, the temperature of the demineralized water is raised, the demineralized water enters the condensed water heat exchanger 9, part of heat is transferred to the condensed water, then enters a primary air heater 12, condensed water output by the seventh low-pressure heater 6 enters a condensed water heat exchanger 9 to absorb heat and then enters a fifth low-pressure heater 11, wherein, the flow of the pipeline is adjusted through the inlet door 7 and the outlet door 10, or the pipeline is directly cut off, the condensed water heat exchanger 9 is stopped, at the initial stage of boiler ignition, the amount of smoke is less, the condensed water heat exchanger 9 is required to be stopped for ensuring the temperature of the air heater, the bypass valve 14 is opened at the moment, the inlet door 7 and the outlet door 10 are closed, the No. six low-pressure heater 8 is opened, the heat exchanger bypass is put into, the heat loss is reduced, and the heat supply of the air heater is preferentially ensured.
The high-temperature demineralized water entering the primary air heater 12 heats the primary air, then enters the secondary air heater 13 to heat the secondary air, and finally enters the condenser 15 to start the next heat absorption-heat release cycle.
To sum up, the utility model discloses well demineralized water is through steam-water, flue gas-water heat exchanger, and the waste heat obtains fully retrieving, passes through condensate heat exchanger 9, water-air heat exchanger etc. again, realizes the promotion of condensate, primary air and overgrate air temperature, reduces the unit coal consumption, improves unit efficiency, has apparent energy-conserving effect.

Claims (6)

1. A small-machine exhaust steam waste heat recycling device of a steam-driven water-feeding pump is characterized by comprising a desalted water input pipeline, a small-machine condenser (15), a circulating pump (3), an air preheater outlet low-temperature economizer (5), a condensed water heat exchanger (9), a heat exchanger bypass, a primary air heater (12), a secondary air heater (13), a condensed water pipeline, a seven-low-pressure heater (6), a six-low-pressure heater (8) and a five-low-pressure heater (11);
the desalted water input pipeline and the outlet of the small condenser (15) are communicated with the inlet of the circulating pump (3), the outlet of the circulating pump (3) is divided into two paths after passing through the low-temperature economizer (5) at the outlet of the air preheater, one path is communicated with the heat release side inlet of the condensed water heat exchanger (9), the other path is communicated with the inlet of the heat exchanger bypass, and the heat release side outlet of the condensed water heat exchanger (9) and the outlet of the heat exchanger bypass are communicated with the inlet of the small condenser (15) through a primary air heater (12) and a secondary air heater (13) in sequence after being connected in parallel through pipelines;
the outlet of the condensed water pipeline is divided into two paths after passing through a No. seven low-pressure heater (6), wherein one path is communicated with the heat absorption side inlet of the condensed water heat exchanger (9), the other path is communicated with the inlet of a No. six low-pressure heater (8), and the heat absorption side outlet of the condensed water heat exchanger (9) and the outlet of the No. six low-pressure heater (8) are communicated with the inlet of a No. five low-pressure heater (11).
2. The steam-driven water-feeding pump small-machine exhaust steam waste heat recycling device as claimed in claim 1, characterized in that a bypass valve (14) is arranged on a bypass of the heat exchanger.
3. The steam-driven water-feeding pump small-machine exhaust steam waste heat recycling device as claimed in claim 1, characterized in that a circulating pump inlet door (2) is arranged at an inlet of the circulating pump (3), and a circulating pump outlet door (4) is arranged at an outlet of the circulating pump (3).
4. The steam-driven water-feeding pump small-machine steam exhaust waste heat recycling device as claimed in claim 1, wherein a desalted water valve (1) is arranged on a desalted water input pipeline.
5. The steam-driven water-feeding pump small-machine exhaust steam waste heat recycling device as claimed in claim 1, wherein an inlet door (7) is arranged at a heat absorption side inlet of the condensed water heat exchanger (9), and an outlet door (10) is arranged at a heat absorption side outlet of the condensed water heat exchanger (9).
6. The steam-driven water-feeding pump small-machine exhaust waste heat recycling device is characterized by further comprising a small-machine exhaust pipeline, wherein the small-machine exhaust pipeline is communicated with a steam inlet of a small-machine condenser (15).
CN202020164800.8U 2020-02-12 2020-02-12 Steam-driven water-feeding pump small-machine exhaust waste heat recycling device Active CN211650196U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202020164800.8U CN211650196U (en) 2020-02-12 2020-02-12 Steam-driven water-feeding pump small-machine exhaust waste heat recycling device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202020164800.8U CN211650196U (en) 2020-02-12 2020-02-12 Steam-driven water-feeding pump small-machine exhaust waste heat recycling device

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112856811A (en) * 2021-01-27 2021-05-28 西安热工研究院有限公司 Double-stage anti-freezing air heater system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112856811A (en) * 2021-01-27 2021-05-28 西安热工研究院有限公司 Double-stage anti-freezing air heater system

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