CN203687004U - Self-flowing type flue gas waste heat recovery system for fuel machine combined cycle heating unit - Google Patents
Self-flowing type flue gas waste heat recovery system for fuel machine combined cycle heating unit Download PDFInfo
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- CN203687004U CN203687004U CN201320689293.XU CN201320689293U CN203687004U CN 203687004 U CN203687004 U CN 203687004U CN 201320689293 U CN201320689293 U CN 201320689293U CN 203687004 U CN203687004 U CN 203687004U
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Abstract
The utility model relates to a self-flowing type flue gas waste heat recovery system for a fuel machine combined cycle heating unit. The self-flowing type flue gas waste heat recovery system comprises a low-pressure economizer, a regulating valve, a dewatering and heating device, a dewatering pump, and a water circulation system formed thereby. When the system runs at a heating mode, the differential pressure between condensation water of the low-pressure economizer and heat transfer working medium of the dewatering and heating device is utilized to suck part of condensation water heated by flue gas in the low-pressure economizer into the dewatering and heating device, and an auxiliary thermal source of the heat supply network water is used for heating heat supply network return water. According to the system, safe and stable operation of the unit cannot be influenced, the unit can be guaranteed to fully recover flue gas waste heat when being operated at a pure power generation and heat supply mode, the heating capacity of the unit is enlarged, the heat efficiency of the unit is improved, and the energy conservation effect is obvious; meanwhile, the system can be used as a starting loop of a heat supply network water heating system and a minimum flow loop of the dewatering pump operated at low heat load, and provides convenience for starting and operating at low heat load of the heat supply network water heating system.
Description
Technical field
The utility model belongs to UTILIZATION OF VESIDUAL HEAT IN field of energy-saving technology, is specifically related to fire machine combined cycle heating unit gravity flow flue gas waste heat recovery system.
Background technology
Efficiently, the combustion machine combined cycle generation technology of low emission is to alleviate energy demand constantly to increase, and alleviates one of technical tactic of environmental pollution.In recent years, under the driving of energy-conservation and the demand of reduction of discharging, combustion machine combined cycle heating unit has become the ideal chose of the big and medium-sized cities regional heating heat supply of north cold area.
Combustion machine combined cycle heating unit, general employing taken out part or all of steam from steamer pusher side, and as thermal source heating hot net water, steam returns to exhaust-heat boiler inlet after condensing through hot net water is cooling, as the feedwater of waste heat boiler, return water temperature is generally 30-80 ℃ of left and right; At non-heating season, steam all enters condenser after steam turbine acting, returns to waste heat boiler after circulating water condenses, and as the feedwater of waste heat boiler, return water temperature is generally 30 ℃ of left and right; Visible, under two kinds of operational modes, return water temperature exists difference, and maximum can differ 50 ℃.This species diversity causes the heat recovery weak effect of waste heat boiler low-temperature flue gas apart from large.Return water temperature is higher, and exhaust gas temperature is just higher, and flue gas waste heat recovery amount is just fewer, and the heat that flue gas is taken away is just more, and therefore, when unit heating operation, the potentiality of flue gas heat recovery are large.The exhaust gas temperature of E type combustion machine heating unit during because of its pure generator operation reached 110-130 ℃, and when the operation of heating operating mode, exhaust gas temperature will be higher, and the potentiality of heat recovery are just larger.For reducing the exhaust gas temperature under heating mode operation, fully Mist heat recovering, the efficiency of raising heating unit, existing technical scheme mainly contains following two kinds:
The first technical scheme: at the exhaust pass of waste heat boiler low-pressure coal saver, set up one-level heating surface module.When heating mode operation, this heating surface is take heat supply network backwater as refrigerant medium, and with the low-pressure coal saver series operation in flue gas flow channel that is refrigerant medium by condensate water, both are cooled flue gas simultaneously, Mist heat recovering; When pure power generation mode operation, the thermal modules that is subject to of newly establishing does not put into operation, low-pressure coal saver isolated operation, heating boiler feedwater, cooled flue gas, Mist heat recovering.
The second technical scheme: except setting up one-level heating surface module at the exhaust pass of waste heat boiler low-pressure coal saver, simultaneously set up low-pressure coal saver bypass.In heating mode when operation,, through low-pressure coal saver bypass, directly enter oxygen-eliminating device from the condensate water of the hydrophobic and condenser of heat exchangers for district heating, and as the feedwater of waste heat boiler, now low-pressure coal saver is in stand-by state; Heat supply network backwater enters the heating surface module of setting up, cooled flue gas, Mist heat recovering.When pure power generation mode operation, low-pressure coal saver puts into operation, and the heating surface module of setting up is in stand-by state.
Above two kinds of technical schemes all can be down to exhaust gas temperature the value of regulation, and fume afterheat can fully be reclaimed; But exist following deficiency: the heating surface module of (a) setting up in two kinds of technical schemes is in the time of pure condensing condition operation, and all in dry-fire condition, the low-pressure coal saver of the second technical scheme is heating under operating mode also in dry-fire condition; (b) the extra heating surface of arranging in flue, has increased flue gas resistance, has improved combustion machine exhaust back pressure, reduces combustion machine and exerts oneself, and has also increased investment simultaneously; (c) in two kinds of technical schemes, all use hot net water as the refrigerant medium of setting up heating surface, and hot net water water quality can not reach the requirement of boiler feedwater standard, will produce heavy corrosion to heating surface inwall metal, reduce the service life of heating surface, caused very large maintenance workload; (d) low-pressure coal saver and newly-increased hot side utilization rate are low, cause a large amount of wastes of heating surface.
In view of this, how at Mist heat recovering, guarantee under the prerequisite of exhaust gas temperature, reduce exhaust resistance, the face dry combustion method that keeps from heat, reduce maintenance workload, become technical problem urgently to be resolved hurrily.
Utility model content
In order to overcome the shortcoming of above-mentioned prior art, the utility model provides the high heating of the combustion machine combined cycle without " dry combustion method " of a kind of stable efficiency unit gravity flow flue gas waste heat recovery system.
For achieving the above object, technical solutions of the utility model are achieved in that a kind of combustion machine combined cycle heating unit gravity flow flue gas waste heat recovery system, comprising:
A kind of combustion machine combined cycle heating unit gravity flow flue gas waste heat recovery system, comprise low-pressure coal saver, low-pressure coal saver is arranged in the flue afterbody of waste heat boiler, the working medium import of low-pressure coal saver is communicated with condensate system, the sender property outlet of low-pressure coal saver 1 be communicated with import, the import of oxygen-eliminating device condensate water of control valve by pipeline respectively; The import of control valve is communicated with the sender property outlet of low-pressure coal saver, and control valve outlet is connected with the hydrophobic import of hydrophobic heater; The heating agent working medium import of hydrophobic heater is communicated with the outlet of control valve and the hydrophobic outlet of hot net water heater, and the heating agent sender property outlet of hydrophobic heater is communicated with hydrophobic pump intake; Hydrophobic pump intake is communicated with the heating agent sender property outlet of hydrophobic heater, and hydrophobic delivery side of pump is communicated with condensing water conduit.
As preferably, the refrigerant medium outlet of low-pressure coal saver and the heating agent working medium import pipeline communication of hydrophobic heater, centre is provided with control valve.
Essence of the present utility model is to improve on the basis of its exchange capability of heat in increase low-pressure coal saver heating surface area, take the pressure reduction between low-pressure coal saver condensate water and hydrophobic heater heating agent working medium and drainage pump as power, at low-pressure coal saver, hydrophobic heater is set up a subcycle system that is independent of Unit Steam Water circulation, increase low-pressure coal saver working medium flow by this subcycle, increase the caloric receptivity of working medium, guarantee that with this flue gas obtains cooling fully in the time that feed temperature raises, reach Mist heat recovering, reduce exhaust resistance, avoid heating surface dry combustion method, reduce the object of extra maintenance workload.Meanwhile, this system is convenient to the operation under input and the low heat loads of hot net water heating system.
Beneficial effect
The beneficial effects of the utility model: exhaust gas temperature is low; The recyclable fume afterheat amount of system is large; Flue gas resistance amplification reduces, and combustion engine efficiency is high; In " hygrometric state ", not there is not " dry combustion method " phenomenon in flue afterbody; Can avoid the corrosion of defective water to inwall; Heating equipment toggle speed is fast.
Accompanying drawing explanation
Fig. 1 is a kind of schematic diagram that fires machine combined cycle heating unit gravity flow flue gas waste heat recovery system.
The specific embodiment
For technological means, creation characteristic that the utility model is realized, reach object and effect is easy to understand, below in conjunction with concrete diagram, further elaboration.
Referring to accompanying drawing 1, a kind of combustion machine combined cycle heating unit gravity flow flue gas waste heat recovery system, comprising: 1 low-pressure coal saver; 2. control valve; 3 hydrophobic heaters; 4 drainage pumps; 5 chimneys; 6 waste heat boiler heating surfaces; 7 combustion machine exhausts; 8 high pressure turbines; 9 low pressure turbines; 10 steamers; 11 condensate pumps; 12 heat exchangers for district heatings; 13 heat supply networks supply water; 14 remove oxygen-eliminating device; 15 heat supply network backwater; 16 recirculation pumps (common configuration that wherein 5-16 item is existing equipment is not just being done concrete repetition herein).Low-pressure coal saver 1, the water circulation subsystem that control valve 2, hydrophobic heater 3 and drainage pump 4 form.
A low-pressure coal saver 1, low-pressure coal saver 1 is arranged in the back-end ductwork of waste heat boiler, the refrigerant medium import of low-pressure coal saver 1 is communicated with condensate system, and the refrigerant medium outlet of low-pressure coal saver 1 is connected with import, the import of oxygen-eliminating device condensate water of control valve 2 by pipeline respectively.
A control valve 2, the import of control valve 2 is connected with the sender property outlet of low-pressure coal saver 1, and the outlet of control valve 2 is connected with the hydrophobic import of hydrophobic heater 3.
When heating mode operation, gravity flow flue gas waste heat recovery system puts into operation, and now control valve 2 is positioned at certain aperture.Heat rear portion from the condensate water of drainage pump 4 and condensate water through low-pressure coal saver 1 and enter oxygen-eliminating device, as boiler feedwater.Another part, under the effect of the pressure reduction between low-pressure coal saver 1 and hydrophobic heater 3, enters hydrophobic heater 3 by control valve 2, and the hydrophobic common heating heat supply network backwater with from heat exchangers for district heating, is transported to condensate system by drainage pump 4 after heat release is cooling.In this process, the aperture of control valve 2 can be by the water level of hydrophobic heater 3 and chimney 5 exhaust gas temperature controls.
When non-heating mode operation, gravity flow flue gas waste heat recovery system is in stand-by state, and control valve 2 is positioned at complete shut-down position.Now steam turbine moves with pure condensation mode, and steam, after steam turbine acting, all enters the import of returning to waste heat boiler after condenser is condensed by circulating water, all flows to oxygen-eliminating device, as boiler feedwater in low-pressure coal saver 1 after flue gas.Flue gas enters atmosphere at low-pressure coal saver 1 after condensate water is cooling.
In the time that unit need to be switched to heating mode operation from pure condensation operation, can first open control valve 2, make low-pressure coal saver 1 export working medium and under the effect of pressure reduction, flow automatically to hydrophobic heater 3, in the time that hydrophobic heater 3 reaches certain water level, start drainage pump 4, between low-pressure coal saver 1, control valve 2, hydrophobic heater 3, drainage pump 4, low-pressure coal saver 1, form a water circulation subsystem, for the switching that unit runs to heating mode operation from pure power generation mode is prepared.In this process, the aperture of control valve 2 is by the water level control of hydrophobic heater 3.
When space heating load declines, hot net water heating steam amount is little, flows into the corresponding minimizing of hydrophobic amount of hydrophobic heater 3, now can the water level by hydrophobic heater 3 control to adjust the aperture of valve 2, to maintain more than drainage pump 4 operates in minimum discharge.Now gravity flow flue gas waste heat recovery system plays the effect in the minimum discharge loop of drainage pump 4.
When heating mode operation, utilize the pressure reduction between low-pressure coal saver condensate water and hydrophobic heater heating agent working medium, by a part of condensate water through flue gas at low-pressure coal saver, be drawn into hydrophobic heater, as hot net water auxiliary thermal source, heating heat supply network backwater, this part condensate water is transported to condensate system by drainage pump at hydrophobic heater after hot net water is cooling, returns to the import of low-pressure coal saver, thereby forms a subsystem take low-pressure coal saver as main body, that be independent of steam/water circulating.When this system recoveries fume afterheat, assurance exhaust gas temperature, do not affect the even running of boiler circuit, heating surface area increment is little, and heating surface area keeps hygrometric state operation always, occur without " dry combustion method " phenomenon, avoided the excessive erosion of underproof water quality to heating surface metal inner surface.In addition, native system can be used as the startup loop of hot net water heating system, has accelerated the input speed of hot net water system; Native system can be used as the minimum discharge loop of drainage pump under low heat loads.When this equipment heating mode operation, the exhaust gas temperature of waste heat boiler is lower all, can drop to 90 ℃ of left and right; Under 100% design heating load, the waste heat amount of the recyclable flue gas of system is larger with respect to existing equipment, can be sparing in the use of coal as 22.9MWt.If calculate by the heating periods of annual 5 months, be equivalent to can save every year more than 10,000 ton of standard coal.
Compared with aforementioned prior art scheme, the utility model has following advantage: 1) amplification of flue gas resistance reduces, and is equivalent to the increase of exerting oneself of combustion machine; 2) no matter being heating operation or pure generator operation, all, in " hygrometric state " operation, not there is not " dry combustion method " phenomenon in flue back-end surfaces; 3) be heat-carrying working medium owing to adopting condensate water, avoided the generation of defective water quality to heating surface metal inner surface corrosion phenomenon.4) before heating system puts into operation, by opening control valve, can, to hydrophobic heater heating agent working medium side water-filling, to set up certain water level in time in hydrophobic heater, make drainage pump possess entry condition, accelerate the input of heating system; 5) in the time that thermic load demand reduces, can, by the aperture of the water level control and regulation valve of hydrophobic heater, make drainage pump operate in it more than minimum discharge, play the effect in drainage pump minimum discharge loop.
Claims (2)
1. a combustion machine combined cycle heating unit gravity flow flue gas waste heat recovery system, comprise low-pressure coal saver, low-pressure coal saver is arranged in the flue afterbody of waste heat boiler, the working medium import of low-pressure coal saver is communicated with condensate system, the sender property outlet of low-pressure coal saver be communicated with import, the import of oxygen-eliminating device condensate water of control valve by pipeline respectively; The import of control valve is communicated with the sender property outlet of low-pressure coal saver, and control valve outlet is connected with the hydrophobic import of hydrophobic heater; The heating agent working medium import of hydrophobic heater is communicated with the outlet of control valve and the hydrophobic outlet of hot net water heater, and the heating agent sender property outlet of hydrophobic heater is communicated with hydrophobic pump intake; Hydrophobic pump intake is communicated with the heating agent sender property outlet of hydrophobic heater, and hydrophobic delivery side of pump is communicated with condensing water conduit.
2. a kind of combustion machine combined cycle heating unit gravity flow flue gas waste heat recovery system as claimed in claim 1, is characterized in that: the refrigerant medium outlet of low-pressure coal saver and the heating agent working medium import pipeline communication of hydrophobic heater, centre is provided with control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320689293.XU CN203687004U (en) | 2013-10-27 | 2013-10-27 | Self-flowing type flue gas waste heat recovery system for fuel machine combined cycle heating unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320689293.XU CN203687004U (en) | 2013-10-27 | 2013-10-27 | Self-flowing type flue gas waste heat recovery system for fuel machine combined cycle heating unit |
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| CN203687004U true CN203687004U (en) | 2014-07-02 |
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| CN201320689293.XU Expired - Fee Related CN203687004U (en) | 2013-10-27 | 2013-10-27 | Self-flowing type flue gas waste heat recovery system for fuel machine combined cycle heating unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114543070A (en) * | 2022-03-30 | 2022-05-27 | 西安西热锅炉环保工程有限公司 | Multi-medium low-temperature economizer system and control method thereof |
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2013
- 2013-10-27 CN CN201320689293.XU patent/CN203687004U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114543070A (en) * | 2022-03-30 | 2022-05-27 | 西安西热锅炉环保工程有限公司 | Multi-medium low-temperature economizer system and control method thereof |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140702 Termination date: 20151027 |
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| EXPY | Termination of patent right or utility model |