CN212108351U - Steam-driven small-machine exhaust waste heat recycling device of draught fan - Google Patents
Steam-driven small-machine exhaust waste heat recycling device of draught fan Download PDFInfo
- Publication number
- CN212108351U CN212108351U CN202020135514.9U CN202020135514U CN212108351U CN 212108351 U CN212108351 U CN 212108351U CN 202020135514 U CN202020135514 U CN 202020135514U CN 212108351 U CN212108351 U CN 212108351U
- Authority
- CN
- China
- Prior art keywords
- steam
- small
- inlet
- induced draft
- draft fan
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model discloses a little quick-witted exhaust waste heat recovery of steam-driven draught fan utilizes device, the export of demineralized water input pipeline and little quick-witted condenser is linked together with the entry of circulating pump, the export of circulating pump is linked together with the water inlet of draught fan import low temperature economizer, the delivery port of draught fan import low temperature economizer is linked together with the water inlet of draught fan export low temperature economizer, the delivery port of draught fan export low temperature economizer is in proper order through the bypass pipeline, the entry of once only wind air heater and overgrate air heater and little quick-witted condenser is linked together, the exhanst gas outlet of draught fan import low temperature economizer is linked together through the flue gas inlet of draught fan export low temperature economizer, the device can utilize the little quick-witted exhaust waste heat heating boiler's of fan overgrate air.
Description
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-driven draught fan.
Background
The induced draft fan is the equipment with the maximum power in the auxiliary machinery of the power station boiler. In recent years, in order to reduce the plant power consumption, the scheme of abandoning an electric draught fan in a coal-fired power plant is changed into the scheme of adopting a small steam turbine to drive the draught fan, and the measure has a better effect on reducing the plant power consumption. The small turbine driving the induced draft fan is called the small turbine of the induced draft fan for short, and the large turbine driving the generator in the thermal power plant is called the large turbine for short. Usually, the small induced draft fan has its own independent condenser. 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 small machine exhaust steam of the induced draft fan is usually separated from the large machine circulating water pipeline. The condensed water obtained by condensing the exhaust steam of the small machine of the induced draft fan 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.
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 draught fan carries high heat, and the heat is directly or indirectly exchanged with air in a cooling tower after being taken away by circulating water and is lost in the atmosphere. If with the little quick-witted exhaust waste heat of draught fan in the past recycle, retrieve the heat of draught fan exit flue gas in step, be used for the primary air and the overgrate air of heating boiler with above-mentioned heat, can show the holistic energy-conserving level of improvement unit undoubtedly.
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-driven draught fan utilizes the fan little quick-witted exhaust waste heat heating boiler's primary air fan overgrate air.
In order to achieve the purpose, the small-machine exhaust steam waste heat recycling device of the steam-driven draught fan comprises a desalted water input pipeline, a small-machine condenser, a circulating pump, a draught fan inlet low-temperature economizer, a draught fan outlet low-temperature economizer, a bypass pipeline, a primary air heater, a secondary air heater, a small-machine condenser and a draught fan;
the demineralized water input pipeline and the outlet of the small condenser are communicated with the inlet of a circulating pump, the outlet of the circulating pump is communicated with the water inlet of the low-temperature economizer at the inlet of the induced draft fan, the water outlet of the low-temperature economizer at the inlet of the induced draft fan is communicated with the water inlet of the low-temperature economizer at the outlet of the induced draft fan, the water outlet of the low-temperature economizer at the outlet of the induced draft fan is communicated with the inlet of the small condenser through a bypass pipeline, a primary air heater and a secondary air heater in sequence, and the flue gas outlet of the low-temperature economizer at the inlet of the induced draft fan is communicated with the flue gas inlet of.
The heating device further comprises a heater, wherein the heater is communicated with the bypass pipeline in parallel.
The pipeline is provided with a bypass valve.
The demineralized water input pipeline is provided with a demineralized water valve.
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 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-driven draught fan small-sized machine steam extraction waste heat recovery utilizes device when concrete operation, adopts condenser + low temperature economizer + hot water fan heater combination formula design, the heat of retrieving is used for heating primary air and overgrate air, is showing and is reducing the unit coal consumption, promotes unit efficiency. Specifically, the temperature of the demineralized water is improved through a small condenser, a low-temperature economizer at the inlet of the induced draft fan and a low-temperature economizer at the outlet of the induced draft fan, so that the demineralized water becomes high-temperature demineralized water, and then primary air and secondary air are heated by utilizing the high-temperature demineralized water, so that the primary air and the secondary air are heated by fully utilizing the waste heat of steam discharged by the small fan, the unit efficiency and the economical efficiency of a power plant are improved, and the remarkable energy-saving effect is achieved. It should be noted that the utility model discloses well waste heat recovery device is whole to be arranged around the draught fan, and waste heat utilization device is whole to be arranged around the air preheater, 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.
Wherein, 1 is a circulating pump inlet door, 2 is a circulating pump, 3 is a circulating pump outlet door, 4 is a low-temperature coal economizer of an induced draft fan inlet, 5 is an induced draft fan, 6 is a low-temperature coal economizer of an induced draft fan outlet, 7 is a heater, 8 is a bypass valve, 9 is a primary air heater, 10 is a secondary air heater, 11 is a condenser of a small machine, and 12 is a desalted water valve.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the small-sized steam exhaust waste heat recycling device of the steam-driven induced draft fan of the present invention comprises a desalted water input pipeline, a small-sized condenser 11, a circulating pump 2, a low-temperature economizer 4 for the inlet of the induced draft fan, a low-temperature economizer 6 for the outlet of the induced draft fan, a bypass pipeline, a primary air heater 9, a secondary air heater 10, a small-sized condenser 11 and an induced draft fan 5; the demineralized water input pipeline and the outlet of the small condenser 11 are communicated with the inlet of the circulating pump 2, the outlet of the circulating pump 2 is communicated with the water inlet of the induced draft fan inlet low-temperature economizer 4, the water outlet of the induced draft fan inlet low-temperature economizer 4 is communicated with the water inlet of the induced draft fan outlet low-temperature economizer 6, the water outlet of the induced draft fan outlet low-temperature economizer 6 is communicated with the inlet of the small condenser 11 sequentially through a bypass pipeline, a primary air heater 9 and a secondary air heater 10, and the flue gas outlet of the induced draft fan inlet low-temperature economizer 4 is communicated with the flue gas inlet of the induced draft fan outlet low-temperature economizer 6 through the induced draft fan 5. The utility model discloses still include heater 7, wherein, heater 7 and the parallelly connected intercommunication of bypass pipeline.
A bypass valve 8 is arranged on the pipeline; a demineralized water valve 12 is arranged on the demineralized water input pipeline; a circulating pump inlet door 1 is arranged at the inlet of the circulating pump 2, and a circulating pump outlet door 3 is arranged at the outlet of the circulating pump 2; 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 11's steam inlet.
The utility model discloses utilize the demineralized water to carry out closed circulation for the working medium, the drive of circulating pump 2 is come from to the power of circulation, and when the system was ready to be put into operation, need pour into the demineralized water earlier, open demineralized water valve 12 this moment, make the demineralized water get into the system, treat to be full of the demineralized water back in the system, open circulating pump entry door 1, start-up circulating pump 2, open circulating pump export door 3, the demineralized water begins to circulate in the system.
The desalted water firstly enters the small-sized condenser 11 as circulating water to exchange 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 demineralized water is pressurized by the circulating pump 2 and then continuously flows through an inlet and an outlet of the draught fan 5, when the demineralized water flows through the draught fan inlet low-temperature economizer 4 arranged at the inlet of the draught fan 5, high-temperature flue gas continuously heats water in a pipeline, the temperature of the flue gas is reduced, the temperature of the demineralized water is increased, the demineralized water continuously moves forward, the heat of the flue gas is absorbed again by the draught fan outlet low-temperature economizer 6 arranged at the outlet of the draught fan 5, the draught fan 5 does work when the flue gas passes through the draught fan 5, the power of the draught fan 5 is high, the temperature of the outlet flue gas is increased, generally, the temperature of the outlet flue gas of the draught fan 5 is 8-10 ℃ higher than that of the inlet flue gas, the heat of the flue gas is absorbed by the draught fan outlet low-temperature economizer 6, and the demineralized water.
After passing through the pipeline, the high-temperature demineralized water enters the primary air heater 9, exchanges heat with cold primary air outside the pipeline through hot water in the pipeline, so that the water temperature is reduced, the primary air temperature output by the primary air heater 9 is increased, the hot water after heat exchange continuously advances into the secondary air heater 10 to exchange heat and reduce the temperature, the secondary air temperature output by the secondary air heater 10 is increased, and then the hot water enters the small condenser 11 to start the next heat absorption-heat release cycle.
When the boiler is started, the coal consumption of the power station boiler is low, the smoke gas amount is low, at the moment, demineralized water cannot be absorbed by a low-temperature economizer when flowing through an inlet and an outlet of the draught fan 5, the heater 7 is started, the heater 7 is only put into use at the initial ignition stage of the boiler to deal with the condition that the initial smoke gas amount is low and the water heating capacity is insufficient, the heater 7 is started to use steam as a heat source, the flowing demineralized water is heated by the heater 7, when the load of the boiler is increased and the smoke gas amount is gradually increased, the steam for starting the heater 7 can be closed, the bypass valve 8 is opened, and the normal working mode is entered.
To sum up, the utility model discloses well demineralized water passes through steam-water, flue gas-water heat exchanger for the waste heat obtains fully retrieving, passes through a plurality of water-air heat exchangers again, realizes the promotion of 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 induced draft fan is characterized by comprising a desalted water input pipeline, a small-machine condenser (11), a circulating pump (2), an induced draft fan inlet low-temperature economizer (4), an induced draft fan outlet low-temperature economizer (6), a bypass pipeline, a primary air heater (9), a secondary air heater (10), a small-machine condenser (11) and an induced draft fan (5);
the desalted water input pipeline and the outlet of the small condenser (11) are communicated with the inlet of the circulating pump (2), the outlet of the circulating pump (2) is communicated with the water inlet of the low-temperature economizer (4) at the inlet of the induced draft fan, the water outlet of the low-temperature economizer (4) at the inlet of the induced draft fan is communicated with the water inlet of the low-temperature economizer (6) at the outlet of the induced draft fan, the water outlet of the low-temperature economizer (6) at the outlet of the induced draft fan is communicated with the inlet of the small condenser (11) through the bypass pipeline, the primary air heater (9) and the secondary air heater (10) in sequence, and the flue gas outlet of the low-temperature economizer (4) at the inlet of the induced draft fan is communicated with the flue gas inlet of the low-temperature economizer (.
2. The small-machine exhaust steam waste heat recycling device of the steam-driven induced draft fan according to claim 1, further comprising a heater (7), wherein the heater (7) is communicated with the bypass pipeline in parallel.
3. The small-machine exhaust steam waste heat recycling device of the steam-driven induced draft fan according to claim 2, characterized in that a bypass valve (8) is arranged on the pipeline.
4. The small-machine steam exhaust waste heat recycling device of the steam-driven induced draft fan according to claim 1, wherein a desalted water valve (12) is arranged on the desalted water input pipeline.
5. The small-machine steam exhaust waste heat recycling device of the steam-driven induced draft fan according to claim 1, wherein an inlet of the circulating pump (2) is provided with an inlet door (1) of the circulating pump, and an outlet of the circulating pump (2) is provided with an outlet door (3) of the circulating pump.
6. The small-machine steam exhaust waste heat recycling device of the steam-driven induced draft fan according to claim 1, further comprising a small-machine steam exhaust pipeline, wherein the small-machine steam exhaust pipeline is communicated with a steam inlet of a small-machine condenser (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020135514.9U CN212108351U (en) | 2020-01-20 | 2020-01-20 | Steam-driven small-machine exhaust waste heat recycling device of draught fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020135514.9U CN212108351U (en) | 2020-01-20 | 2020-01-20 | Steam-driven small-machine exhaust waste heat recycling device of draught fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212108351U true CN212108351U (en) | 2020-12-08 |
Family
ID=73627258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020135514.9U Active CN212108351U (en) | 2020-01-20 | 2020-01-20 | Steam-driven small-machine exhaust waste heat recycling device of draught fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212108351U (en) |
-
2020
- 2020-01-20 CN CN202020135514.9U patent/CN212108351U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202768090U (en) | Recovery system of dead steam waste heat | |
| CN108443906B (en) | Flue gas waste heat utilization system and method based on multi-energy level and recirculated heating cold air | |
| CN102678206B (en) | Thermodynamic system for combined heat recovery of power plant | |
| CN105889897B (en) | A kind of thermal power plant residual heat integrative recycling system and method | |
| CN102401393B (en) | Exhaust waste heat recycling system of power plant boiler | |
| CN101852459B (en) | System for improving efficiency of power plant by driving heat pump with steam extracted from extraction steam turbine | |
| CN209308763U (en) | A kind of air-cooled electricity generation system containing internal function of recovering waste heat | |
| CN203671577U (en) | Efficient waste heat recovery system of machine and boiler coupled air cooling power station | |
| CN103471084B (en) | Low-pressure hot-water smoke cooling system and method for avoiding low-temperature corrosion of air pre-heater | |
| CN205332168U (en) | Waste heat comprehensive recovery utilization system of thermal power factory | |
| CN211650196U (en) | Steam-driven water-feeding pump small-machine exhaust waste heat recycling device | |
| CN106196147A (en) | A kind of exhaust steam residual heat that reclaims improves the thermal efficiency and the system of unit on-load ability | |
| CN108613237A (en) | A kind of thermal power cogeneration central heating system based on temperature counterpart cascade utilization | |
| CN102494329B (en) | Device for utilizing flue gas waste heat of boiler comprehensively | |
| CN212108351U (en) | Steam-driven small-machine exhaust waste heat recycling device of draught fan | |
| CN201779765U (en) | System capable of improving effectiveness of power plant by using steam extracted by extraction steam turbine to drive heat pump | |
| CN213840882U (en) | Dry quenching circulating flue gas waste heat recycling system | |
| CN214307058U (en) | High-efficient supercritical carbon dioxide boiler with two working mediums | |
| CN211575209U (en) | Energy-saving white smoke eliminating system for double-stage flue gas waste heat recovery of gas-fired boiler | |
| CN108085908B (en) | Dyeing machine heat recovery device | |
| CN209671079U (en) | The gaseous fuel heating system of Combined cycle gas-steam turbine | |
| CN210014388U (en) | Deep recycling cascade utilization system for low-temperature flue gas waste heat of coal-fired unit | |
| CN107035445B (en) | Regenerative thermal system combining steam-driven induced draft fan and air heater | |
| CN206709053U (en) | A kind of power station recirculated water smoke waste heat comprehensive utilization system | |
| CN218934509U (en) | High-efficiency energy-saving thermodynamic system for driving induced draft fan by back pressure turbine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |