CN103090441A - Low vacuum heating supply system of thermoelectric plant - Google Patents
Low vacuum heating supply system of thermoelectric plant Download PDFInfo
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- CN103090441A CN103090441A CN201110341930XA CN201110341930A CN103090441A CN 103090441 A CN103090441 A CN 103090441A CN 201110341930X A CN201110341930X A CN 201110341930XA CN 201110341930 A CN201110341930 A CN 201110341930A CN 103090441 A CN103090441 A CN 103090441A
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Abstract
The invention discloses a low vacuum heating supply system of a thermoelectric plant, and relates to the technical fields of low temperature waste heat recovery and centralized heating of the thermoelectric plant. The low vacuum heating supply system of the thermoelectric plant comprises an absorption heat pump, a steam turbine, a steam condenser connected with the tail end of the steam turbine through a waste steam exhaust pipeline, a heat consumer connected with a circulating water heat exchange tube bundle inside the steam condenser through a heating network water supply pipeline and a heating network water return pipeline, and a heating network circulating pump located on the heating network water return pipeline or the heating network water supply pipeline. The low vacuum heating supply system of the thermoelectric plant is structurally characterized in that, an absorber of the absorption heat pump and a heat exchange tube bundle inside a condenser are respectively connected with the heating network water supply pipeline in series, a heat exchange tube bundle in an evaporator of the absorption heat pump is connected with the heating network water return pipeline in series, and a heat exchange tube bundle in a generator of the absorption heat pump and a medium and low voltage cylinder in the steam turbine are connected together in series through a low pressure steam pipeline. Compared with the prior art, the low vacuum heating supply system of the thermoelectric plant not only can effectively improve heating network water supply temperature and increase the heat supply radius of low vacuum circulating water heat supply, but also can avoid potential safety hazards on the steam turbine and the steam condenser caused by excess heating network water return temperature.
Description
Technical field
The low temperature exhaust heat that the present invention relates to steam power plant reclaims and the central heating technical field.
Background technology
Along with going deep into of urbanization and urbanization process, the heat supply in winter demand gap of continuation appears in the northern area of China.But a lot of local, County Level Regional particularly is difficult to again to satisfy newly-built thermoelectricity and examines harsh requirement to industrial thermic load, can't newly-built steam power plant, can only adopt original medium and small thermoelectricity and thermoelectricity are carried out the mode that heat supply is transformed, even by increasing arcola as an alternative.Do like this, not only reduced primary energy ratio, wasted the energy, brought again a series of environmental problem.And improve supply water temperature and the heat range of heat of low vacuum circulation, and finally enlarge its heat capacity, have important practical significance.
The low vacuum circulating water heating of steam power plant is under the prerequisite that does not change main equipment, artificial reduction steam turbine steam discharge vacuum, thereby the weary steam that utilizes steam turbine inside to finish merit comes heat supply heating, have advantages of remarkable reduction power plant cold end loss, improve cycle efficieny, the little instant effect of investment, be fit to very much the heat supply transformation of medium and small generator group, therefore obtained promoting rapidly in the central heating such as northern China area.
But the problem that above-mentioned technology exists is that supply water temperature is low, and heat range of heat is too short.During Heat Supplying with Low Vacuum, the height of heat supply network recirculated water supply water temperature depends on steam turbine back pressure, condensing amount and quantity of circulating water.Can improve supply water temperature although raise back pressure, the while has also consisted of certain threat to the safety of steam turbine and condenser, relates to hidden danger and comprises exhaust casing dilatancy, bear vibration, exhaust stage blade safety, condenser heat exchange copper tube thermal stress etc.Therefore, the steam turbine back pressure is generally 30～50kPa, and the heat supply network supply water temperature is generally 60～70 ℃, and heat range of heat generally is confined in 5km.
In prior art, general modification scheme is to set up peak load calorifier 7 in condenser 2 outlets, as shown in Figure 1.Consume a certain amount of low-pressure pumping steam of steam turbine 1, the supply water temperature of recirculated water is promoted to 80～90 ℃ from 60～70 ℃.Even if but regulated simultaneously the flow of pumps for hot water supply net 3, the return water temperature of recirculated water has also risen to 55～65 ℃ by 45～55 ℃.Similar with too high supply water temperature, be also serious potential safety hazard for steam turbine 1 and the too high heat supply network return water temperature of condenser 2.Therefore, return water temperature roughly under constant prerequisite, improve the heat supply network supply water temperature, become the key that improves low vacuum circulating water heating ability.
Summary of the invention
For above-mentioned the deficiencies in the prior art, the purpose of this invention is to provide a kind of steam power plant Low Vacuum Heating System.It can effectively improve the heat supply network supply water temperature, increases the heat range of heat of low vacuum circulating water heating, can also avoid the too high potential safety hazard of bringing to steam turbine and condenser of heat supply network return water temperature.
In order to reach the foregoing invention purpose, technical scheme of the present invention realizes as follows:
A kind of steam power plant Low Vacuum Heating System, is positioned at the pumps for hot water supply net on heat supply network water return pipeline or heat supply network supply channel at the condenser that it comprises absorption heat pump, steam turbine, be connected by the exhaust steam blow-off line with the steam turbine end, the hot user who is connected with the recirculated water heat-exchanging tube bundle of condenser inside by heat supply network supply channel and heat supply network water return pipeline.Its design feature is, heat-exchanging tube bundle in the absorber of described absorption heat pump and condenser is connected in series with the heat supply network supply channel, heat-exchanging tube bundle in the evaporimeter of absorption heat pump be connected in series with the heat supply network water return pipeline, and the heat-exchanging tube bundle that the generator of absorption heat pump is interior and the mesolow cylinder of steam turbine are by the low-pressure steam pipeline and be serially connected.
In above-mentioned Low Vacuum Heating System, described absorption heat pump adopts single-effect type or pleiotropism.
The present invention is owing to having adopted said structure, replace peak load calorifier of the prior art with absorption heat pump, both effectively improved the heat supply network supply water temperature, increased the heat range of heat of low vacuum circulating water heating, avoided again the too high potential safety hazard of bringing for steam turbine and condenser of heat supply network return water temperature, therefore concerning the heat supply capacity expansion revamping of the steam power plant that adopts the low vacuum circulation, has important application and popularization value.
The invention will be further described below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is the structural representation of prior art Low Vacuum Heating System.
Fig. 2 is structural representation of the present invention.
The specific embodiment
Referring to Fig. 2, the condenser 2 that the present invention includes absorption heat pump 9, steam turbine 1, is connected by the exhaust steam blow-off line with steam turbine 1 end, the hot user 5 who is connected with the recirculated water heat-exchanging tube bundle of condenser 2 inside by heat supply network supply channel 6 and heat supply network water return pipeline 4, be positioned at the pumps for hot water supply net 3 on heat supply network water return pipeline 4 or heat supply network supply channel 6.Heat-exchanging tube bundle in the absorber of absorption heat pump 9 and condenser is connected in series with heat supply network supply channel 6, heat-exchanging tube bundle in the evaporimeter of absorption heat pump 9 be connected in series with heat supply network water return pipeline 4, and the heat-exchanging tube bundle that the generator of absorption heat pump 9 is interior and the mesolow cylinder of steam turbine 1 are by low-pressure steam pipeline 8 and be serially connected.
In the course of work of the present invention, absorption heat pump 9 is promoted to 80～90 ℃ with the supply water temperature of heat supply network recirculated water from 60～70 ℃, absorption heat pump 9 is by low-pressure saturated steam (for example steam turbine low pressure (LP) cylinder) driving of drawing gas of 0.1～1.0MPa, absorb 55～65 ℃ the heat supply network backwater heat and it is cooled to 40 ℃～50 ℃ after send into condenser 2.
Claims (2)
1. steam power plant's Low Vacuum Heating System, it comprises absorption heat pump (9), steam turbine (1), the condenser (2) that is connected by the exhaust steam blow-off line with steam turbine (1) end, the hot user (5) who is connected by heat supply network supply channel (6) and heat supply network water return pipeline (4) and the inner recirculated water heat-exchanging tube bundle of condenser (2), be positioned at the pumps for hot water supply net (3) on heat supply network water return pipeline (4) or heat supply network supply channel (6), it is characterized in that, heat-exchanging tube bundle in the absorber of described absorption heat pump (9) and condenser is connected in series with heat supply network supply channel (6), heat-exchanging tube bundle in the evaporimeter of absorption heat pump (9) is connected in series with heat supply network water return pipeline (4), heat-exchanging tube bundle in the generator of absorption heat pump (9) with the mesolow cylinder of steam turbine (1) by low-pressure steam pipeline (8) and be serially connected.
2. steam power plant according to claim 1 Low Vacuum Heating System, is characterized in that, described absorption heat pump (9) adopts single-effect type or pleiotropism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110341930XA CN103090441A (en) | 2011-11-02 | 2011-11-02 | Low vacuum heating supply system of thermoelectric plant |
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| CN201110341930XA CN103090441A (en) | 2011-11-02 | 2011-11-02 | Low vacuum heating supply system of thermoelectric plant |
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| CN103090441A true CN103090441A (en) | 2013-05-08 |
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| CN201110341930XA Pending CN103090441A (en) | 2011-11-02 | 2011-11-02 | Low vacuum heating supply system of thermoelectric plant |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103836697A (en) * | 2014-03-26 | 2014-06-04 | 华北电力大学 | Circulating water direct connection waste heat supply and steam extraction heat supply coupled combined heat and power generation heat supply system |
| CN107514667A (en) * | 2017-09-11 | 2017-12-26 | 华北电力大学 | The central heating system of steam power plant's cross-season heat-storage heat release is realized using electric heat pump |
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| CN1811303A (en) * | 2006-02-18 | 2006-08-02 | 李华玉 | Single-effect heat pump/double-effect cooling absorption set and combined heat, electricity and cold supply system |
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| CN101581517A (en) * | 2009-06-16 | 2009-11-18 | 天津大学 | Heat pump system of single-loop geothermal underground heat exchanger |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103836697A (en) * | 2014-03-26 | 2014-06-04 | 华北电力大学 | Circulating water direct connection waste heat supply and steam extraction heat supply coupled combined heat and power generation heat supply system |
| CN103836697B (en) * | 2014-03-26 | 2017-02-22 | 华北电力大学 | Circulating water direct connection waste heat supply and steam extraction heat supply coupled combined heat and power generation heat supply system |
| CN107514667A (en) * | 2017-09-11 | 2017-12-26 | 华北电力大学 | The central heating system of steam power plant's cross-season heat-storage heat release is realized using electric heat pump |
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Application publication date: 20130508 |